CN117585873A - Environment-friendly recycling system and environment-friendly recycling method for cement chlorine bypass dust - Google Patents
Environment-friendly recycling system and environment-friendly recycling method for cement chlorine bypass dust Download PDFInfo
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- CN117585873A CN117585873A CN202310974983.8A CN202310974983A CN117585873A CN 117585873 A CN117585873 A CN 117585873A CN 202310974983 A CN202310974983 A CN 202310974983A CN 117585873 A CN117585873 A CN 117585873A
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- Prior art keywords
- potassium chloride
- slurry
- sludge cake
- cement
- dryer
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- 239000000460 chlorine Substances 0.000 title claims abstract description 348
- 229910052801 chlorine Inorganic materials 0.000 title claims abstract description 348
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 title claims abstract description 315
- 238000000034 method Methods 0.000 title claims abstract description 289
- 239000000428 dust Substances 0.000 title claims abstract description 261
- 239000004568 cement Substances 0.000 title claims abstract description 256
- 238000004064 recycling Methods 0.000 title claims abstract description 193
- 230000008569 process Effects 0.000 claims abstract description 171
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 867
- 239000010802 sludge Substances 0.000 claims description 465
- 239000001103 potassium chloride Substances 0.000 claims description 433
- 235000011164 potassium chloride Nutrition 0.000 claims description 433
- 239000002002 slurry Substances 0.000 claims description 389
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 328
- 238000004090 dissolution Methods 0.000 claims description 260
- 238000001556 precipitation Methods 0.000 claims description 190
- 239000007864 aqueous solution Substances 0.000 claims description 132
- 230000002378 acidificating effect Effects 0.000 claims description 118
- 239000000706 filtrate Substances 0.000 claims description 115
- 238000003860 storage Methods 0.000 claims description 103
- 238000001035 drying Methods 0.000 claims description 81
- 239000006228 supernatant Substances 0.000 claims description 71
- 238000004062 sedimentation Methods 0.000 claims description 58
- 239000002994 raw material Substances 0.000 claims description 53
- 238000012546 transfer Methods 0.000 claims description 44
- 239000002351 wastewater Substances 0.000 claims description 42
- 230000007613 environmental effect Effects 0.000 claims description 41
- 239000013078 crystal Substances 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 33
- 238000006297 dehydration reaction Methods 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 18
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 16
- 239000000920 calcium hydroxide Substances 0.000 claims description 16
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 16
- 230000018044 dehydration Effects 0.000 claims description 15
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 claims description 14
- 239000000701 coagulant Substances 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- 230000001376 precipitating effect Effects 0.000 claims description 8
- 239000000047 product Substances 0.000 claims description 7
- 239000013049 sediment Substances 0.000 claims description 7
- 229920002472 Starch Polymers 0.000 claims description 6
- -1 alum Chemical compound 0.000 claims description 6
- 229940037003 alum Drugs 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 239000003792 electrolyte Substances 0.000 claims description 6
- 239000011790 ferrous sulphate Substances 0.000 claims description 6
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 6
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 6
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 6
- 229920000620 organic polymer Polymers 0.000 claims description 6
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims 1
- 239000006227 byproduct Substances 0.000 abstract description 15
- 238000011084 recovery Methods 0.000 description 22
- 239000002244 precipitate Substances 0.000 description 19
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 14
- 235000011116 calcium hydroxide Nutrition 0.000 description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 238000011068 loading method Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- 239000010409 thin film Substances 0.000 description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- 239000002699 waste material Substances 0.000 description 7
- 239000003513 alkali Substances 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000008020 evaporation Effects 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000003949 liquefied natural gas Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 6
- 230000004931 aggregating effect Effects 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 5
- 235000012255 calcium oxide Nutrition 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910001385 heavy metal Inorganic materials 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910052925 anhydrite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/20—Agglomeration, binding or encapsulation of solid waste
- B09B3/25—Agglomeration, binding or encapsulation of solid waste using mineral binders or matrix
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/38—Stirring or kneading
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/60—Methods for eliminating alkali metals or compounds thereof, e.g. from the raw materials or during the burning process; methods for eliminating other harmful components
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Ceramic Engineering (AREA)
- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Toxicology (AREA)
- Structural Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
- General Chemical & Material Sciences (AREA)
Abstract
The invention provides an environment-friendly recycling system and an environment-friendly recycling method for cement chlorine bypass dust, which can prevent scaling in a pipeline and perform the dissolving or dehydrating process as more than one part of repeated process and continuous circulating process when recycling the chlorine bypass dust as a byproduct of a cement process.
Description
Technical Field
The invention relates to an environment-friendly recycling system and an environment-friendly recycling method for cement chlorine bypass dust, which prevent scaling in a pipeline and perform the dissolving or dehydrating process as more than one part of repeated process and continuous circulating process when recycling the chlorine bypass dust as a byproduct of a cement process.
Background
In general, chlorine bypass dust is a waste material containing potassium chloride (KCl), quicklime (CaO) or anhydrite (CaSO) after bypass of chlorine components which cause problems such as clogging of a preheater when cement is prepared by extracting a part of the chlorine components 4 ) Is a process byproduct of (a).
In particular, the chlorine bypass dust is an inorganic substance contained in hot gas forcibly extracted at a temperature portion of the kiln at about 1000 ℃ in order to smoothly operate the kiln for clinker production operated at a high temperature of about 2000 ℃ in the cement production process and to eliminate volatile substances containing chlorine, and contains anhydrous gypsum and quicklime which are pre-dehydrated and decarbonized at a high temperature of 1000 ℃ in addition to potassium chloride.
The chlorine bypass dust generated in the cement process is almost exclusively buried as a specific waste having a high content of alkali, particularly potassium, chlorine, heavy metals, etc., but recently, as the cost of burying increases, research and practical process applications of recycling methods for recovering potassium chloride and sludge for using cement raw materials by constituting a separate recycling process in the cement process have been gradually raised from the viewpoint of cost saving.
The above recycling method mainly focuses on the development and improvement technology of recycling processes for the purpose of recycling the raw material sludge treatment of cement, which is used for improving the purity, increasing the yield, reducing heavy metals, and reducing the recycling cost of calcium chloride produced by recycling the raw material sludge based on the recovery of potassium chloride, and has not been popularized in the industry.
Further, the recycling method has the following fatal drawbacks.
First, the recycling method has a disadvantage that a part of the steps and the whole steps cannot be repeatedly performed and continuous operation is not possible.
That is, it is necessary to perform a transfer process for a rear-end process such as separation, dehydration, and drying in a state where a solution of chlorine bypass dust or a sludge having a water content of about 60% is dissolved in water or an acidic aqueous solution in the front-end process.
In this case, the conveyor belt transfer or the pump transfer through the pipe is performed according to the state of the transfer object.
However, the chlorine bypass dust contains a considerable amount of calcium (Ca) and Sulfate (SO) in addition to a large amount of alkali and chlorine as an inorganic substance contained in hot gas forcibly extracted at a temperature portion of about 1000 ℃ in the kiln in order to smoothly operate the kiln for clinker production operated at a high temperature of about 2000 ℃ in the cement production process and eliminate volatile substances containing chlorine 4 2- ) When ions are transported by a conveyor or pumped through a pipeline after being contacted with water or an acidic aqueous solution, the ions not only produce potassium chloride but also calcium carbonate (CaCO) 3 ) And gypsum, thus must be transmittedThe scaling of the belt or the pipe makes it impossible to repeat a part of the necessary steps and to continuously run the whole step for a predetermined time or longer due to the partial loading or clogging of the transfer product, which causes problems such as limitation of the yield of potassium chloride and reduction of the economical efficiency such as the increase of the operation cost of the step, and also causes a problem of limitation of the equipment source.
Second, the recycling method has a disadvantage that it cannot give a high added value to the sludge.
That is, although the chlorine bypass dust is dissolved in water or an acidic aqueous solution and then separated and dehydrated to produce sludge having a water content of about 60%, potassium chloride, calcium carbonate and gypsum which are inevitably generated in a conveyor or a pipe during the process are inevitably scaled, and thus repetition of a part of the necessary processes and continuous operation of the whole process for a predetermined time or longer are impossible due to partial loading or clogging, and the chlorine content contained in the sludge cannot be reduced to a predetermined amount or less, and only a cement raw material which is simply inexpensive can be put into a cement kiln again in a limited manner, so that recycling of a high added value is limited.
Third, the recycling method has a disadvantage that problems occur in the generation and treatment of wastewater.
The chlorine bypass dust is dissolved in water or an acidic aqueous solution, and then the solution or the sludge having about 60% of water is formed by a process such as separation, dehydration and drying, and in this state, wastewater is inevitably produced, and waste treatment, purification treatment, drying evaporation and the like are continued depending on the amount of wastewater produced, but the cost of each waste treatment, the cost of chemicals for purification treatment, the power required for drying, the cost of energy such as Liquefied Natural Gas (LNG) and the like are produced, and therefore, the method is not preferable in terms of operation and economy.
Fourth, the recycling method has a disadvantage of low drying efficiency.
That is, since conventional dryers of a general drying system such as a rotary dryer and a spray dryer are mainly used, there is a problem that the drying efficiency is low, and the cost of energy such as power required for drying and liquefied natural gas is excessive, which is low.
Accordingly, the present applicant has achieved the present invention by long-term diligent efforts to obtain an environment-friendly recycling system and an environment-friendly recycling method for cement chlorine bypass dust, which prevent scaling in a pipeline and perform a dissolution or dehydration process as one or more partial repetition process and continuous circulation process when recycling the chlorine bypass dust as a by-product of the cement process, in order to solve the problems that the partial process and the whole process cannot be repeatedly performed, that the sludge cannot be given a high added value, that the wastewater is generated and treated, and that the drying efficiency is low.
Prior art literature
Patent literature
Korean patent No. 10-1561637 (patent grant date: 2015, 10, 13)
Disclosure of Invention
Technical problem
Accordingly, an object of the present invention is to provide an environment-friendly recycling system for cement chlorine bypass dust, which prevents scaling in a pipeline when recycling the chlorine bypass dust as a by-product of a cement process, and which performs a process of repeating a dissolving or dehydrating process as a part of one or more times and a continuous circulation process.
The present invention also provides an environment-friendly recycling method of cement chlorine bypass dust, which prevents scaling in a pipeline when recycling the chlorine bypass dust as a byproduct of a cement process and performs a process of repeating a dissolving or dehydrating process as one or more steps and a continuous recycling process.
The present invention also provides the potassium chloride recovered by the above-mentioned cement-chlorine bypass dust environmental protection recovery system.
The present invention also provides a sludge with a reduced chlorine concentration produced by the above-described cement chlorine bypass dust environmental protection recycling system.
The present invention also provides potassium chloride recovered by the above-mentioned method for environmentally friendly recycling of cement chlorine bypass dust.
The present invention also provides sludge with reduced chlorine concentration produced by the method for environmentally friendly recycling of cement chlorine bypass dust.
The problems to be solved by the present invention are not limited to the mentioned problems, and the non-mentioned or other problems can be clearly understood by those skilled in the art to which the present invention pertains through the following description.
Technical proposal
In order to solve the above problems, according to an embodiment of the present invention, there is provided an environment-friendly recycling system for cement-chlorine bypass dust, comprising: one or more dissolution mixers 120 for placing cement-chlorine bypass dust, and dissolving the cement-chlorine bypass dust in at least one of the supernatant of a sedimentation tank selected from the group consisting of water, an acidic aqueous solution and a potassium chloride sedimentation tank 160 to form a slurry; a slurry dehydrator 130 for separating the slurry dissolved in the dissolution mixer into a sludge cake and a dehydrated filtrate; and one or more potassium chloride settling tanks 160 for transferring the dehydrated filtrate and recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals. When the slurry is transferred from the dissolution mixer 120 to the slurry dehydrator 130, the slurry is pumped out by using a roller vacuum type self-priming hose pump, and the environment-friendly recycling system of cement chlorine bypass dust is operated by repeating the process or continuous circulation process as one or more steps by preventing scaling in a pipeline by pumping out by using the roller vacuum type self-priming hose pump.
According to an embodiment of the present invention, the above-mentioned environmental protection recycling system for cement chlorine bypass dust may further include: a sludge cake storage area 140 to which the sludge cake is transferred; one or more sludge cake dryers 150 for drying sludge cakes in the sludge cake storage yard to form sludge having a reduced chlorine concentration used as a cement raw material; one or more potassium chloride dryers 170 for recovering potassium chloride by drying the dehydrated filtrate; or the potassium chloride is recovered by transferring and drying the sediment precipitated in the above-mentioned potassium chloride precipitation tank 160.
According to an embodiment of the present invention, the one or more dissolution mixers 120 of the system for recycling cement chlorine bypass dust are underground so that the upper end of the dissolution mixer 120 is level with the ground, the slurry is pumped out from the upper part of the one or more dissolution mixers 120, and the one or more dissolution mixers 120 are further filled with the dryer condensate of the potassium chloride dryer 170, and the cement chlorine bypass dust can be dissolved in the dryer condensate of the potassium chloride dryer 170.
According to an embodiment of the present invention, the sludge cake storage 140 may be formed to be underground at a side lower portion of the slurry dehydrator 130, and the dehydrated sludge cake may be dropped, stored, or transferred to the side lower storage of the dehydrator.
According to an embodiment of the present invention, the sludge cake storage 140 is configured to put at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 into the sludge cake storage 140, and to mix the sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 to prepare a slurry, and to pump the slurry to the dissolution mixer 120 through the roller vacuum type self-priming hose pump.
According to an embodiment of the present invention, the above-mentioned environmental protection recycling system for cement chlorine bypass dust includes: a step of dissolving the cement-chlorine bypass dust in at least one selected from water, an acidic aqueous solution, a supernatant of the precipitation tank of the potassium chloride precipitation tank 160, and condensed water of the potassium chloride dryer 170 in a dissolution mixer 1 as a first dissolution; a step of preparing a first regenerated slurry by mixing the first sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 after preparing the first sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the first sludge cake into the sludge cake storage; pumping the first regenerated slurry to a No. 2 dissolution mixer 120 by a roller vacuum self-priming hose pump; a step of dissolving, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 120 in at least one selected from water, an acidic aqueous solution, a supernatant liquid of the precipitation tank 160 of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer 170 to prepare a slurry; and a step of preparing a second regenerated slurry by mixing the second sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 after preparing a second sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the second sludge cake into the sludge cake storage 140, whereby scaling in a pipeline of the environment-friendly recycling system for cement chlorine bypass dust can be prevented and the dissolving or dehydrating step can be performed as one or more partial repetition steps and continuous circulation steps.
According to an embodiment of the present invention, in the above-described system for recycling cement chlorine bypass dust, when the dissolving or dehydrating process is performed as one or more partial repetition processes and continuous circulation processes, the dissolving time may be shortened as the number of repeated dissolving or dehydrating processes increases.
According to an embodiment of the present invention, the potassium chloride precipitation tank 160 may be provided with a heating device at the bottom and the side of the heating device, which is a constant or constant heating device.
According to an embodiment of the present invention, an coagulant may be added to the potassium chloride precipitation tank 160, and the coagulant may contain at least one selected from the group consisting of slaked lime (calcium hydroxide), alum, aluminum chloride, ferric oxide, and ferrous sulfate as an inorganic electrolyte, or starch or polyacrylamide and derivatives thereof as an organic polymer compound.
According to an embodiment of the present invention, in order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank 160, the environmental protection recycling system of cement chlorine bypass dust may use a roller vacuum type self-priming hose pump or a submersible pump to pump the precipitation tank supernatant of the potassium chloride precipitation tank 160 as the dissolution mixing water of the dissolution mixer 120 at the time point of generating the precipitation tank supernatant while precipitating and settling potassium chloride crystals from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160.
According to an embodiment of the present invention, the environment-friendly recycling system of cement-chlorine bypass dust may transfer the condensed water of the sludge cake dryer 150 or the condensed water of the potassium chloride dryer 170 to be used as the mixing water for dissolving of the dissolving mixer 120 and the mixing water for preparing regenerated slurry of sludge cake in the sludge cake storage 140 in order to fundamentally eliminate the generation of waste water.
According to an embodiment of the present invention, in the above-mentioned environmental protection recycling system for cement chlorine bypass dust, after sludge cake generated in the slurry dehydrator is transferred to the underground storage at the lower side of the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from sludge, the subsequent transfer line is further formed by two lines of the sludge cake dryer 150 and the product sludge storage 180, and can be transferred separately or simultaneously.
According to the embodiment of the invention, the environment-friendly recycling system of cement chlorine bypass dust can be used for preparing the dry sludge for the high-added-value cement auxiliary material by transferring sludge cakes generated in the slurry dehydrator to an underground storage yard at the lower part of the side surface of the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from the sludge and then transferring the sludge cakes to a sludge cake dryer so as to reduce the water content to below 5%.
According to still another embodiment of the present invention, the present invention provides an environmental protection recycling method of cement chlorine bypass dust, which is characterized by comprising: step S110, after cement-chlorine bypass dust is put into one or more dissolution mixers 120, the cement-chlorine bypass dust is dissolved in at least one of the supernatant liquid of a sedimentation tank selected from water, an acidic aqueous solution and a potassium chloride sedimentation tank 160 to form slurry; step S120, transferring the slurry dissolved in the dissolution mixer 120 to a slurry dehydrator 130 to separate the slurry into sludge cake and dehydrated filtrate; and step S130, transferring the dehydrated filtrate to one or more potassium chloride precipitation tanks 160, and recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals. When transferring the slurry from the dissolution mixer 120 to the slurry dehydrator 130, the slurry is pumped out by using a roller vacuum type self-priming hose pump, and the method for recycling the cement chlorine bypass dust is performed by repeating the process or the continuous circulation process as one or more steps by using the roller vacuum type self-priming hose pump to prevent scaling in the pipeline.
According to an embodiment of the present invention, the above-mentioned method for recycling cement chlorine bypass dust in an environment-friendly manner may further include: step S140, transferring the dehydrated filtrate separated in the slurry dehydrator 130 to one or more potassium chloride dryers 170 and drying to recover potassium chloride; or step S150, transferring the sedimentation tank sediment settled in the potassium chloride sedimentation tank 160 to more than one potassium chloride dryer 170 and drying to recover potassium chloride.
According to an embodiment of the present invention, the above-mentioned method for recycling cement chlorine bypass dust in an environment-friendly manner may further include: step S160, transferring the sludge cake to a sludge cake storage site 140 to prepare sludge for raw materials of a firing kiln; or step S170, the sludge cake is transferred to the sludge cake dryer 150 to prepare dried sludge for cement auxiliary materials.
According to an embodiment of the present invention, the above-mentioned method for recycling cement chlorine bypass dust in an environment-friendly manner may further include: step S180, placing the supernatant of the potassium chloride sedimentation tank 160 or the condensed water of the potassium chloride dryer 170 together with water or acidic aqueous solution into the dissolution mixer 120; or step S190, after the dryer condensed water of the potassium chloride dryer 170 or the dryer condensed water of the sludge cake dryer 150 is placed in the sludge cake storage 140, at least one selected from the group consisting of water, an acidic aqueous solution, the condensed water of the sludge cake dryer 150 and the condensed water of the potassium chloride dryer 170 is placed in the sludge cake storage 140 to prepare a regenerated slurry, and the regenerated slurry is transferred to the dissolution mixer 120.
According to an embodiment of the present invention, the one or more dissolution mixers 120 of the method for recycling cement-chlorine bypass dust are underground so that the upper end of the dissolution mixer 120 is level with the ground, the slurry is pumped out from the upper part of the one or more dissolution mixers 120, and the one or more dissolution mixers 120 are further filled with the dryer condensate of the potassium chloride dryer 170, and the cement-chlorine bypass dust can be dissolved in the dryer condensate of the potassium chloride dryer 170.
According to an embodiment of the present invention, an coagulant may be added to the potassium chloride precipitation tank 160, and the coagulant may contain at least one selected from the group consisting of slaked lime (calcium hydroxide), alum, aluminum chloride, ferric oxide, and ferrous sulfate as an inorganic electrolyte, or starch or polyacrylamide and derivatives thereof as an organic polymer compound.
According to an embodiment of the present invention, in order to shorten the precipitation time of potassium chloride crystals in the potassium chloride precipitation tank 160, the method for recycling cement chlorine bypass dust may use a roller vacuum type self-priming hose pump or a submersible pump to pump the precipitation tank supernatant of the potassium chloride precipitation tank 160 as the mixing water for dissolution of the dissolution mixer 120 at the time point of generating the precipitation tank supernatant while precipitating and settling potassium chloride crystals from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160.
According to an embodiment of the present invention, the sludge cake storage 140 may be formed to be underground at a side lower portion of the slurry dehydrator 130 so that the dehydrated sludge cake may be dropped, stored or transferred to the side lower storage of the dehydrator.
According to an embodiment of the present invention, the sludge cake storage 140 may be configured to put at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 into the sludge cake storage 140, and mix the sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 to prepare a slurry and pump the slurry to the dissolution mixer 120 through the roller vacuum type self-priming hose pump.
According to an embodiment of the invention, the method for recycling cement chlorine bypass dust in an environment-friendly manner comprises the following steps: a step of dissolving the cement-chlorine bypass dust in at least one selected from water, an acidic aqueous solution, a supernatant of the precipitation tank of the potassium chloride precipitation tank 160, and condensed water of the potassium chloride dryer 170 in a dissolution mixer 1 as a first dissolution; a step of preparing a first regenerated slurry by mixing the first sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 after preparing the first sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the first sludge cake into the sludge cake storage; pumping the first regenerated slurry to a No. 2 dissolution mixer 120 by a roller vacuum self-priming hose pump; a step of dissolving, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 120 in at least one selected from water, an acidic aqueous solution, a supernatant liquid of the precipitation tank 160 of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer 170 to prepare a slurry; and a step of preparing a secondary sludge cake by dehydrating the slurry by the slurry dehydrator 130, dropping the secondary sludge cake into the sludge cake storage 140, and mixing the secondary sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 to prepare a secondary regenerated slurry, thereby preventing scaling in a pipe and repeating the dissolving or dehydrating step as one or more steps.
According to an embodiment of the present invention, in the method for recycling cement chlorine bypass dust, when the dissolving or dehydrating process is performed as one or more partial repetition processes and continuous circulation processes, the dissolving time may be shortened as the number of repeated dissolving or dehydrating processes increases.
According to an embodiment of the present invention, the potassium chloride precipitation tank 160 may be provided with a heating device at the bottom and the side of the heating device, which is a constant or constant heating device.
According to an embodiment of the present invention, the method for recycling cement-chlorine bypass dust may transfer the condensed water of the sludge cake dryer 150 or the condensed water of the potassium chloride dryer 170 to be used as the mixing water for dissolving of the dissolving mixer 120 and the mixing water for preparing regenerated slurry of sludge cake in the sludge cake storage 140 in order to fundamentally eliminate the generation of wastewater.
According to an embodiment of the present invention, in the above-mentioned method for recycling cement chlorine bypass dust, after sludge cake generated in the slurry dehydrator is transferred to the underground storage at the lower side of the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from sludge, the subsequent transfer line is further formed by two lines of the sludge cake dryer 150 and the product sludge storage 180, and can be transferred separately or simultaneously.
According to the method for recycling the cement-chlorine bypass dust in an environment-friendly manner, the sludge cake generated in the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from sludge can be transferred to an underground storage yard at the lower part of the side surface of the slurry dehydrator and then transferred to a sludge cake dryer, so that the water content is reduced to below 5%, and the dried sludge for the high-added-value cement auxiliary material can be prepared.
According to still another embodiment of the present invention, the present invention provides potassium chloride recovered by the above-described cement chlorine bypass dust environmental protection recycling system.
According to another embodiment of the invention, the invention provides sludge with reduced chlorine concentration prepared by the environment-friendly recycling system of cement chlorine bypass dust.
According to still another embodiment of the present invention, the present invention provides potassium chloride recovered by the above-described method for environmentally friendly recycling of cement chlorine bypass dust.
According to still another embodiment of the present invention, the present invention provides sludge with reduced chlorine concentration prepared by the above-described method for environmentally friendly recycling of cement chlorine bypass dust.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, there is provided an environment-friendly recycling system for cement chlorine bypass dust, which prevents scaling in a pipeline when recycling the chlorine bypass dust as a by-product of a cement process and performs a dissolving or dehydrating process as a partial repetition process or a continuous circulation process at least once, and which is excellent in recycling efficiency.
The present invention also provides an environment-friendly recycling method of cement chlorine bypass dust, which is capable of preventing scaling in a pipeline when recycling the chlorine bypass dust as a byproduct of a cement process, and performing a dissolving or dehydrating process as a part of one or more repeated processes or a continuous recycling process, wherein the process stability is remarkable and the process is economical.
The invention also provides the potassium chloride recovered by the environment-friendly recycling system of the cement chlorine bypass dust, and the recycling system has economical efficiency.
The invention also provides the sludge with reduced chlorine concentration prepared by the environment-friendly recycling system of cement chlorine bypass dust, and the sludge has economy.
The invention also provides the potassium chloride recovered by the environmental protection recycling method of the cement chlorine bypass dust, and the method has economical efficiency.
The invention also provides the sludge with reduced chlorine concentration prepared by the environment-friendly recycling method of the cement chlorine bypass dust, and the sludge has economy.
The effects of the present invention are not limited to the above-described effects, and it is to be understood that all effects which may be deduced by the construction of the invention described in the detailed description of the present invention or the scope of the invention claimed below are also included.
Drawings
FIG. 1 is a schematic block diagram of an environment-friendly recycling system for cement chlorine bypass dust according to an embodiment of the invention.
FIG. 2 is a process flow diagram of an environment-friendly recycling method for cement chlorine bypass dust according to an embodiment of the invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The advantages, features and methods of accomplishing the same may be apparent by reference to the accompanying drawings and the detailed description that follows.
However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various forms, which are only for the purpose of making the disclosure of the present invention more complete, and are provided so that those skilled in the art to which the present invention pertains will fully appreciate the scope of the present invention, which is defined only by the scope of the claims of the present invention.
In the description of the present invention, if it is determined that the gist of the present invention is likely to be confused with the conventional art or the like, a detailed description thereof will be omitted.
The present invention will be described in detail below.
Environment-friendly recycling system for cement chlorine bypass dust
The invention provides an environment-friendly recycling system for cement chlorine bypass dust, which prevents scaling in a pipeline when recycling the chlorine bypass dust as a byproduct of a cement process, and performs a dissolving or dehydrating process as a part of more than one repeated process and a continuous circulating process.
The environment-friendly recycling system for cement chlorine bypass dust comprises: one or more dissolution mixers 120 for placing cement-chlorine bypass dust, and dissolving the cement-chlorine bypass dust in at least one of the supernatant of a sedimentation tank selected from the group consisting of water, an acidic aqueous solution and a potassium chloride sedimentation tank 160 to form a slurry; a slurry dehydrator 130 for separating the slurry dissolved in the dissolution mixer into a sludge cake and a dehydrated filtrate; and one or more potassium chloride settling tanks 160 for transferring the dehydrated filtrate and recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals. When transferring the slurry from the dissolution mixer 120 to the slurry dehydrator 130, the slurry is pumped out by using a roller vacuum type self-priming hose pump, and the environment-friendly recycling system of cement chlorine bypass dust can be implemented by repeating the process or continuous circulation process as one or more steps by preventing scaling in the pipeline by pumping out by using the roller vacuum type self-priming hose pump.
The invention provides an environment-friendly recycling system for cement chlorine bypass dust, which prevents scaling in a pipeline when recycling the chlorine bypass dust as a byproduct of a cement process, and performs a dissolving or dehydrating process as a part of more than one repeated process and a continuous circulating process, and has excellent recycling efficiency.
Moreover, the environment-friendly recycling system of cement chlorine bypass dust can further comprise: a sludge cake storage area 140 to which the sludge cake is transferred; one or more sludge cake dryers 150 for drying sludge cakes in the sludge cake storage yard to form sludge having a reduced chlorine concentration used as a cement raw material; one or more potassium chloride dryers 170 for recovering potassium chloride by drying the dehydrated filtrate; or more than one potassium chloride dryer 170, for recovering potassium chloride by transferring and drying the sediment precipitated in the above-mentioned potassium chloride precipitation tank 160.
In general, chlorine bypass dust is a process byproduct containing potassium chloride, quicklime or anhydrite, which remains after bypass of chlorine components that cause problems such as clogging of a preheater when cement is prepared by extracting a part of the chlorine components.
In particular, the chlorine bypass dust is an inorganic substance contained in hot gas forcibly extracted at a temperature portion of the kiln at about 1000 ℃ in order to smoothly operate the kiln for clinker production operated at a high temperature of about 2000 ℃ in the cement production process and to eliminate volatile substances containing chlorine, and contains anhydrous gypsum and quicklime which are pre-dehydrated and decarbonized at a high temperature of 1000 ℃ in addition to potassium chloride.
The chlorine bypass dust generated in the cement process is almost exclusively buried as a specific waste having a high content of alkali, particularly potassium, chlorine, heavy metals, etc., but recently, as the cost of burying increases, research and practical process applications of recycling methods for recovering potassium chloride and sludge for using cement raw materials by constituting a separate recycling process in the cement process have been gradually raised from the viewpoint of cost saving.
The above-mentioned recycling method is mainly focused on the development and improvement technology of recycling processes for the purpose of improving the purity, increasing the yield, reducing heavy metals, and reducing the recycling cost of calcium chloride produced by recycling the potassium chloride, and treating sludge for cement raw materials, and has not been widely used in industry in large part.
Further, the recycling method has the following fatal drawbacks.
First, the recycling method has a disadvantage that a part of the steps and the whole steps cannot be repeatedly performed and continuous operation is not possible.
That is, it is necessary to perform a transfer process for a rear-end process such as separation, dehydration, and drying in a state where a solution of chlorine bypass dust or a sludge having a water content of about 60% is dissolved in water or an acidic aqueous solution in the front-end process.
In this case, the conveyor belt transfer or the pump transfer through the pipe is performed according to the state of the transfer object.
However, since chlorine bypass dust is an inorganic substance contained in hot gas forcibly extracted at a temperature portion of about 1000 ℃ of a kiln in order to smoothly operate the kiln for clinker production operated at a high temperature of about 2000 ℃ in a cement production process and eliminate volatile substances containing chlorine, and contains a considerable amount of calcium and sulfate ions in addition to a large amount of alkali and chlorine, potassium chloride is generated and calcium carbonate and gypsum are generated when the kiln is transported by a conveyor or pumped by a pipe after contact with water or an acidic aqueous solution, scaling of the conveyor or the pipe is inevitably generated, and repetition of a part of necessary processes and continuous operation of the whole process for a predetermined time or more are impossible due to partial loading or clogging of a transfer product, which causes problems such as increase in yield of potassium chloride, increase in process operation cost, and economic deterioration of the like, and also causes a problem of limitation in equipment sources.
Second, the recycling method has a disadvantage that it cannot give a high added value to the sludge.
That is, although the chlorine bypass dust is dissolved in water or an acidic aqueous solution and then separated and dehydrated to produce sludge having a water content of about 60%, potassium chloride, calcium carbonate and gypsum which are inevitably generated in a conveyor or a pipe during the process are inevitably scaled, and thus repetition of a part of the necessary processes and continuous operation of the whole process for a predetermined time or longer are impossible due to partial loading or clogging, and the chlorine content contained in the sludge cannot be reduced to a predetermined amount or less, and only a cement raw material which is simply inexpensive can be put into a cement kiln again in a limited manner, so that recycling of a high added value is limited.
Third, the recycling method has a disadvantage that problems occur in the generation and treatment of wastewater.
The chlorine bypass dust is dissolved in water or an acidic aqueous solution, and then the solution or the sludge having about 60% of water is formed by a process such as separation, dehydration and drying, and in this state, wastewater is inevitably produced, and waste treatment, purification treatment, drying evaporation and the like are continued depending on the amount of wastewater produced, but the cost of each waste treatment, the cost of chemicals for purification treatment, the power required for drying, the cost of energy such as Liquefied Natural Gas (LNG) and the like are produced, and therefore, the method is not preferable in terms of operation and economy.
Fourth, the recycling method has a disadvantage of low drying efficiency.
That is, since conventional dryers of a general drying system such as a rotary dryer and a spray dryer are mainly used, there is a problem that the drying efficiency is low, and the cost of energy such as power required for drying and liquefied natural gas is excessive, which is low.
Accordingly, the present applicant has achieved the present invention by long-term diligent efforts to obtain an environment-friendly recycling system and an environment-friendly recycling method for cement chlorine bypass dust, which prevent scaling in a pipeline and perform a dissolution or dehydration process as one or more partial repetition process and continuous circulation process when recycling the chlorine bypass dust as a by-product of the cement process, in order to solve the problems that the partial process and the whole process cannot be repeatedly performed, that the sludge cannot be given a high added value, that the wastewater is generated and treated, and that the drying efficiency is low.
FIG. 1 is a schematic block diagram of an environment-friendly recycling system for cement chlorine bypass dust according to an embodiment of the invention.
Referring to fig. 1, the apparatus includes a chlorine bypass dust storage yard 100 and a chlorine bypass dust loading device 110 for loading chlorine bypass dust.
Further, the slurry is formed by adding cement-chlorine bypass dust to at least one of the cement-chlorine bypass dust, water, an acidic aqueous solution, a supernatant of a precipitation tank 160 of a potassium chloride precipitation tank, and a condensed water of a dryer 170 of a potassium chloride dryer, and then dissolving the cement-chlorine bypass dust in the at least one of the above-mentioned water, acidic aqueous solution, supernatant of the precipitation tank and condensed water.
And, comprising: a slurry dehydrator 130 for separating the slurry dissolved in the dissolution mixer into a sludge cake and a dehydrated filtrate; and a sludge cake storage 140 for transferring the sludge cake thereto.
Further, the sludge dryer 150 is provided with one or more sludge cake dryers, and the sludge cake in the sludge cake storage yard is dried to form sludge having a reduced chlorine concentration to be used as a cement raw material.
And, comprising: more than one potassium chloride sedimentation tank 160 for transferring the dehydrated filtrate and recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals; one or more potassium chloride dryers 170 for recovering potassium chloride by drying the dehydrated filtrate; and one or more potassium chloride dryers 170 for recovering potassium chloride by transferring and drying the sediment precipitated in the above-mentioned potassium chloride precipitation tank.
The system for recycling the cement chlorine bypass dust in an environment-friendly manner can prevent scaling in a pipeline when recycling the cement chlorine bypass dust as a byproduct of a cement process, and can perform a dissolving or dehydrating process as a part of more than one repeated process and a continuous recycling process.
Wherein, the above-mentioned partial repetition process may be 1 to 6 times.
In this case, the recycling efficiency of the cement chlorine bypass dust may be improved as the number of repetition of the partial repetition process increases.
The continuous circulation step may be a step of continuously circulating the dissolving, dehydrating or drying step more than once.
In this case, when the slurry is transferred from the dissolution mixer 120 to the slurry dehydrator 130, the slurry may be pumped out by a roller vacuum type self-priming hose pump, and the slurry may be pumped out from the upper portion of the dissolution mixer 120.
In addition, the chlorine bypass dust contains a considerable amount of calcium and sulfate ions in addition to a large amount of alkali and chlorine, and when the dust is brought into contact with water or an acidic aqueous solution and then transported by a conveyor or pumped through a pipeline, potassium chloride is generated, calcium carbonate and gypsum are generated, and therefore, scaling is inevitably generated in the conveyor or the pipeline.
The roller vacuum self-priming hose pump can make slurry and regenerated slurry enter from the suction inlet and discharge through the discharge outlet through the high-pressure vacuum tube capable of expanding and contracting and the compression roller capable of transferring in the forward direction and the reverse direction.
Therefore, the roller vacuum self-priming hose pump fundamentally blocks the phenomenon of partial loading and clogging of solid components during the transfer process due to scale formed in the conveyor or the pipe, and thus can enable repetition of part or all of the steps and continuous operation for a predetermined time or longer of all of the steps.
Also, the sludge cake dryer 150 may include a vertical cylindrical continuous dryer.
The vertical cylindrical continuous dryer for drying sludge cake may have a drying cross section on all surfaces of its vertical cylinder, and the sludge cake fed into the vertical cylindrical continuous dryer may be dried while being adhered in a thin film form to all surfaces of the vertical cylindrical continuous dryer by centrifugal force, and thus the sludge may be dried in a thin film form.
Wherein, the vertical cylindrical continuous dryer for drying sludge cake has a thermal efficiency more than about 1 time that of the conventional rotary dryer or spray dryer, and the evaporated steam is recovered in total amount of condensed water to replace the mixed water, so that no waste water is generated, thereby remarkably improving the economical efficiency of the operation of the process.
Also, the potassium chloride dryer 170 may include a vertical cylindrical continuous dryer.
The vertical cylindrical continuous dryer for drying potassium chloride may have a drying cross section on all surfaces of a vertical cylinder, and the sludge cake fed into the vertical cylindrical continuous dryer may be dried while being adhered in a thin film form to all surfaces of the vertical cylindrical continuous dryer by centrifugal force, and the sludge may be dried in such a manner as to be in a thin film form.
Wherein, the heat efficiency of the vertical cylindrical continuous dryer for drying potassium chloride is more than about 1 time better than that of the existing rotary dryer or spray dryer, and the evaporated steam is recycled in total amount of condensed water to replace the mixed water, so no waste water is generated, thereby remarkably improving the economical efficiency of the operation of the process.
The one or more dissolution mixers 120 of the system for recycling the cement chlorine bypass dust are underground so that the upper end of the dissolution mixer 120 is level with the ground, and the slurry is pumped out from the upper part of the one or more dissolution mixers 120, and the one or more dissolution mixers 120 are further put into the dryer condensate of the potassium chloride dryer 170, and the cement chlorine bypass dust can be dissolved in the dryer condensate of the potassium chloride dryer 170.
When the slurry is transferred from the dissolution mixer 120 to the slurry dehydrator 130, the slurry may be pumped out using the roller vacuum type self-priming hose pump, and the slurry may be pumped out from the upper portion of the dissolution mixer 120 to the transfer line.
The sludge cake storage 140 may be lowered to the side lower portion of the slurry dehydrator 130 to drop, store, or transfer the dehydrated sludge cake to the side lower portion of the dehydrator.
The sludge cake storage 140 is configured to put at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 into the sludge cake storage 140, and to mix the sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 to prepare a slurry, and to pump the slurry to the dissolution mixer 120 by the roller vacuum self-priming hose pump.
Among them, a dissolution mixer for dissolving chlorine bypass dust in water or an acidic aqueous solution can be used for underground formation so that the upper end portion is level with the ground. This is to reduce the sludge cake storage area generated in the slurry dehydrator to the lower side of the slurry dehydrator, and then to mix the sludge cake with water or an acidic aqueous solution to slurry the sludge cake, and to minimize the difference in height between the lower side of the sludge cake storage area and the upper end of the dissolution mixer when transferring the sludge cake to the dissolution mixer in the next round, thereby increasing the transfer convenience and the improvement in the operation rate.
Further, a transfer line for transferring the slurry after stirring in a dissolution stirrer for dissolving the chlorine bypass dust in water or an acidic aqueous solution is configured to pump the slurry from an upper portion of the dissolution stirrer. This is to eliminate clogging of the pipe which often occurs when the slurry is pumped out from the lower part due to an excessively high concentration of the slurry in the lower part of the mixer.
Wherein, above-mentioned cement chlorine bypass dust's environmental protection recycle system includes: a step of dissolving the cement-chlorine bypass dust in at least one selected from water, an acidic aqueous solution, a supernatant of the precipitation tank of the potassium chloride precipitation tank 160, and condensed water of the potassium chloride dryer 170 in a dissolution mixer 1 as a first dissolution; a step of preparing a first regenerated slurry by mixing the first sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 after preparing the first sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the first sludge cake into the sludge cake storage; pumping the first regenerated slurry to a No. 2 dissolution mixer 120 by a roller vacuum self-priming hose pump; a step of dissolving, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 120 in at least one selected from water, an acidic aqueous solution, a supernatant liquid of the precipitation tank 160 of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer 170 to prepare a slurry; and a step of preparing a second-time regenerated slurry by mixing the second-time sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 after preparing a second-time sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the second-time sludge cake into the sludge cake storage 140, thereby preventing scaling in a pipeline of the environment-friendly recycling system of cement-chlorine bypass dust and repeating the dissolving or dehydrating step as one or more steps.
Wherein, the above-mentioned one or more continuous circulation process or partial repetition process may be 1 to 6 times.
In this case, the recycling efficiency of the cement chlorine bypass dust may be improved as the number of repetition of the partial repetition process increases.
In the first step of dissolving, dehydrating and drying, the cement-chlorine bypass dust is placed in a dissolving mixer, and then the cement-chlorine bypass dust is dissolved in at least one selected from the group consisting of water, a supernatant of a precipitation tank of an acidic aqueous solution potassium chloride precipitation tank, and a dryer condensate of a potassium chloride dryer to form a slurry.
The slurry dissolved in the dissolution mixer may be dewatered using a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry may be pumped out by using a roller vacuum type self-priming hose pump, and the slurry may be pumped out from the upper part of the dissolution mixer to the transfer line.
The sludge cake may then be transported to a sludge cake storage site to prepare sludge for the kiln raw material.
Further, the above sludge cake may be transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
Then, the dehydrated filtrate may be transferred to a potassium chloride precipitation tank to precipitate and precipitate potassium chloride, thereby recovering potassium chloride.
The dehydrated filtrate may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
Further, the precipitate precipitated in the above potassium chloride precipitation tank may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
In this case, the conveyor line is hardly clogged, and waste water is hardly generated.
In the second partial repeating step of dissolution and dehydration, cement chlorine bypass dust may be placed in a dissolution mixer No. 1 as the first dissolution, and the cement chlorine bypass dust may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant of a precipitation tank of a potassium chloride precipitation tank, and a condensed water of a dryer of a potassium chloride dryer to form a slurry.
After that, as the first dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 1 may be dewatered using a slurry dewatering machine to separate into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry may be pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, after the first sludge cake is dropped to the sludge cake storage yard, the first sludge cake may be mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first regenerated slurry.
In this case, the first regenerated slurry may be pumped to the dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as the second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage site, and then the sludge for the kiln raw material can be prepared.
Further, the above-described second sludge cake may be transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate and the second dehydrated filtrate may be transferred to a potassium chloride precipitation tank to precipitate and precipitate potassium chloride, thereby recovering potassium chloride.
The first dehydrated filtrate and the second dehydrated filtrate may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
Further, the precipitate precipitated in the above potassium chloride precipitation tank may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
In this case, the conveyor line is hardly clogged, and waste water is hardly generated.
In the three-part repeated step of dissolution and dehydration, cement chlorine bypass dust may be placed in a dissolution mixer No. 1 as the first dissolution, and the cement chlorine bypass dust may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of the potassium chloride precipitation tank, and a condensed water of a dryer of the potassium chloride dryer to form a slurry.
After that, as the first dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 1 may be dewatered using a slurry dewatering machine to separate into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry may be pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, after the first sludge cake is dropped to the sludge cake storage site, the first sludge cake may be mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first regenerated slurry.
In this case, the first regenerated slurry may be pumped to the dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as the second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, after the second sludge cake is dropped to the sludge cake storage yard, the second sludge cake may be mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a second regenerated slurry.
In this case, the second regenerated slurry may be pumped to the dissolution mixer No. 3 using a roller vacuum type self-priming hose pump.
Then, as a third dissolution, the second regenerated slurry transferred to the dissolution mixer No. 3 was dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the third dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 3 may be dewatered using a slurry dewatering machine to separate into a third sludge cake and a third dewatered filtrate.
After that, the third sludge cake is dropped to the sludge cake storage site, and then the sludge for the kiln raw material can be prepared.
Further, the above-described third sludge cake may be transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate may be transferred to a potassium chloride precipitation tank to precipitate and precipitate potassium chloride, thereby recovering potassium chloride.
The first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
Further, the precipitate precipitated in the above potassium chloride precipitation tank may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
In this case, the conveyor line is hardly clogged, and waste water is hardly generated.
In the above-described environment-friendly recycling system for cement chlorine bypass dust, when the dissolving or dehydrating step is performed as a partial repetition step and a continuous circulation step of one or more times, the dissolving time can be shortened as the number of repeated dissolving or dehydrating steps increases.
The potassium chloride precipitation tank 160 may be provided with a heating device at a constant time or at any time such as a heating power pipe or a steam pipe at the bottom and the side.
The potassium chloride precipitation tank 160 may be charged with an aggregating agent containing at least one selected from the group consisting of slaked lime (calcium hydroxide), alum, aluminum chloride, ferric oxide, and ferrous sulfate as an inorganic electrolyte, or containing starch, polyacrylamide, and derivatives thereof as an organic polymer compound.
In order to shorten the time for precipitating potassium chloride crystals in the potassium chloride precipitation tank 160, the system for environmentally friendly recycling of cement chlorine bypass dust uses a roller vacuum type self-priming hose pump or a submersible pump to pump the supernatant of the precipitation tank 160 at the time point of generating the supernatant of the precipitation tank as the mixing water for dissolving the dissolution mixer 120 while precipitating and settling potassium chloride crystals from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160.
In the repeated process of dissolving chlorine bypass dust in water or acid aqueous solution and separating and dehydrating water or aqueous solution from sludge, the subsequent conveying line of dehydrated filtrate generated in the slurry dehydrator can be divided into a potassium chloride sedimentation tank and a potassium chloride dryer independently of the dehydration times so as to be capable of being independently or simultaneously conveyed.
In the repeated process of dissolving the chlorine bypass dust in water or an acidic aqueous solution and separating and dehydrating the water or the aqueous solution from the sludge, the dehydrated filtrate produced in the slurry dehydrator can be transferred to the potassium chloride precipitation tank. This is to minimize the potassium chloride dryer operation process or maximize the economy by improving the drying efficiency.
In order to facilitate the evaporation of water, the bottom and the side of the potassium chloride sedimentation tank can be provided with a heating device such as a heating pipeline or a steam pipeline at any time or at any time. This is to adjust the time for precipitation of potassium chloride crystals according to the change in the time required for supersaturation of potassium chloride by evaporation of water from the dehydrated filtrate, depending on whether the heating apparatus is operated or not.
In order to further shorten the precipitation time of potassium chloride crystals, the coagulant may be added to the dehydrated filtrate transferred to the potassium chloride precipitation tank, and the addition amount may be adjusted. This is to promote sedimentation by accelerating sedimentation velocity of potassium chloride particles precipitated from crystals in a liquid.
Further, in order to further shorten the potassium chloride crystal precipitation time, the supernatant may be removed by pumping using a roller vacuum type self-priming hose pump at the time point of precipitating and settling potassium chloride crystals in the dehydrated filtrate transferred to the potassium chloride precipitation tank and generating the supernatant of the precipitation tank, or transferred to a dissolution mixer to be used as the mixed water for dissolution.
In order to fundamentally eliminate the generation of wastewater, the environment-friendly recycling system of cement chlorine bypass dust may transfer the condensed water of the sludge cake dryer 150 or the condensed water of the potassium chloride dryer 170 to be used as the mixing water for dissolving the dissolution mixer 120 and the mixing water for preparing the regenerated slurry of the sludge cake in the sludge cake storage 140.
In addition, the environment-friendly recycling system of cement chlorine bypass dust can be used for preparing the dry sludge for the high-added-value cement auxiliary material by transferring sludge cakes generated in the slurry dehydrator to an underground storage yard at the lower part of the side surface of the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from the sludge and then transferring the sludge cakes to a sludge cake dryer so that the water content is reduced to below 5%.
In the repeated process of separating and dewatering water or water solution from sludge, sludge cake produced in the slurry dewatering machine is transferred to the underground storage site below the side of the slurry dewatering machine, and the subsequent conveying line consists of two lines of sludge cake drier and product sludge storage site, and may be transferred separately or simultaneously.
Environment-friendly recycling method for cement chlorine bypass dust
The invention provides an environment-friendly recycling method for cement chlorine bypass dust, which is used for preventing scaling in a pipeline when recycling the chlorine bypass dust as a byproduct of a cement process, and is used for repeating the dissolving or dehydrating process as more than one part and the continuous recycling process.
The environment-friendly recycling method of cement chlorine bypass dust comprises the following steps: step S110, after cement-chlorine bypass dust is put into one or more dissolution mixers 120, the cement-chlorine bypass dust is dissolved in at least one of the supernatant liquid of a sedimentation tank selected from water, an acidic aqueous solution and a potassium chloride sedimentation tank 160 to form slurry; step S120, transferring the slurry dissolved in the dissolution mixer 120 to a slurry dehydrator 130 to separate the slurry into sludge cake and dehydrated filtrate; and step S130, transferring the dehydrated filtrate to one or more potassium chloride precipitation tanks 160, and recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals. When transferring the slurry from the dissolution mixer 120 to the slurry dehydrator 130, the slurry is pumped out by using a roller vacuum type self-priming hose pump, and the method for recycling the cement chlorine bypass dust in an environment-friendly manner may be performed by repeating the process or the continuous circulation process as one or more steps by preventing scaling in a pipe by pumping out the slurry by using the roller vacuum type self-priming hose pump.
The invention provides an environment-friendly recycling method for cement chlorine bypass dust, which is used for preventing scaling in a pipeline when recycling the chlorine bypass dust as a byproduct of a cement process, and is used for repeating the dissolving or dehydrating process as more than one part and the continuous circulating process, wherein the process stability is remarkable, and the method has economy.
In addition, the environmental protection recycling method of cement chlorine bypass dust can further comprise the following steps: step S140, transferring the dehydrated filtrate separated in the slurry dehydrator 130 to one or more potassium chloride dryers 170 and drying to recover potassium chloride; or step S150, transferring the sedimentation tank sediment settled in the potassium chloride sedimentation tank 160 to more than one potassium chloride dryer 170 and drying to recover potassium chloride.
In addition, the environmental protection recycling method of cement chlorine bypass dust can further comprise the following steps: step S160, transferring the sludge cake to a sludge cake storage site 140 to prepare sludge for raw materials of a firing kiln; or step S170, the sludge cake is transferred to the sludge cake dryer 150 to prepare dried sludge for cement auxiliary materials.
In addition, the environmental protection recycling method of cement chlorine bypass dust can further comprise the following steps: step S180, placing the supernatant of the potassium chloride sedimentation tank 160 or the condensed water of the potassium chloride dryer 170 together with water or acidic aqueous solution into the dissolution mixer 120; or step S190, after the dryer condensed water of the potassium chloride dryer 170 or the dryer condensed water of the sludge cake dryer 150 is placed in the sludge cake storage 140, at least one selected from the group consisting of water, an acidic aqueous solution, the condensed water of the sludge cake dryer 150 and the condensed water of the potassium chloride dryer 170 is placed in the sludge cake storage 140 to prepare a regenerated slurry, and the regenerated slurry is transferred to the dissolution mixer 120.
Fig. 2 is a process flow diagram of an environment-friendly recycling method for cement chlorine bypass dust according to an embodiment of the invention.
Referring to fig. 2, after cement-chlorine bypass dust is put into one or more dissolution mixers 120, the cement-chlorine bypass dust is dissolved in at least one selected from the group consisting of water, an acidic aqueous solution, a supernatant of a precipitation tank 160 of a potassium chloride precipitation tank, and condensed water of a potassium chloride dryer 170 to form a slurry (step S110).
Then, the slurry dissolved in the dissolution mixer 120 is transferred to the slurry dehydrator 130 to be separated into a sludge cake and a dehydrated filtrate (step S120).
Thereafter, the dehydrated filtrate is transferred to one or more potassium chloride precipitation tanks 160, and potassium chloride is recovered by precipitation and sedimentation of potassium chloride crystals (step S130).
Alternatively, the dehydrated filtrate is transferred to one or more potassium chloride dryers 170 and dried to recover potassium chloride (step S140).
Alternatively, the precipitate of the potassium chloride precipitation tank 160 is transferred to one or more potassium chloride dryers 170 and dried to recover potassium chloride (step S150).
The sludge cake is then transported to the sludge cake storage 140 to prepare sludge for the raw material of the firing kiln (step S160).
Thereafter, the sludge cake is transferred to the sludge cake dryer 150 to prepare dry sludge for cement auxiliary materials having a reduced chlorine concentration, which is used as a cement raw material, in a minute amount (step S170).
The supernatant of the potassium chloride precipitation tank 160 or the condensed water of the potassium chloride dryer 170 is put into the dissolution mixer 120 together with water or an acidic aqueous solution (step S180).
Finally, after the dryer condensed water of the potassium chloride dryer 170 or the dryer condensed water of the sludge cake dryer 150 is placed in the sludge cake storage 140, at least one selected from the group consisting of water, an acidic aqueous solution, the condensed water of the sludge cake dryer 150, and the condensed water of the potassium chloride dryer 170 is placed in the sludge cake storage 140 to prepare a regenerated slurry, and then the regenerated slurry is transferred to the dissolution mixer 120 (step S190).
The method for recycling the cement chlorine bypass dust in an environment-friendly way can prevent scaling in a pipeline and can carry out the dissolving or dehydrating process as a part of repeated process and continuous circulating process for more than one time.
Wherein, the above-mentioned partial repetition process may be 1 to 6 times.
In this case, the recycling efficiency of the cement chlorine bypass dust may be improved as the number of repetition of the partial repetition process increases.
The continuous circulation step may be a step of continuously circulating the dissolving, dehydrating or drying step more than once.
In this case, when the slurry is transferred from the dissolution mixer 120 to the slurry dehydrator 130, the slurry may be pumped out by a roller vacuum type self-priming hose pump, and the slurry may be pumped out from the upper portion of the dissolution mixer 120.
In addition, the chlorine bypass dust contains a considerable amount of calcium and sulfate ions in addition to a large amount of alkali and chlorine, and when the dust is brought into contact with water or an acidic aqueous solution and then transported by a conveyor or pumped through a pipeline, potassium chloride is generated, calcium carbonate and gypsum are generated, and therefore, scaling is inevitably generated in the conveyor or the pipeline.
The roller vacuum self-priming hose pump can make slurry and regenerated slurry enter from the suction inlet and discharge through the discharge outlet through the high-pressure vacuum tube capable of expanding and contracting and the compression roller capable of transferring in the forward direction and the reverse direction.
Therefore, the roller vacuum self-priming hose pump fundamentally blocks the phenomenon of partial loading and clogging of solid components during the transfer process due to scale formed in the conveyor or the pipe, and thus can enable repetition of part or all of the steps and continuous operation for a predetermined time or longer of all of the steps.
Also, the sludge cake dryer 150 may include a vertical cylindrical continuous dryer.
The vertical cylindrical continuous dryer for drying sludge cake may have a drying cross section on all surfaces of its vertical cylinder, and the sludge cake fed into the vertical cylindrical continuous dryer may be dried while being adhered in a thin film form to all surfaces of the vertical cylindrical continuous dryer by centrifugal force, and thus the sludge may be dried in a thin film form.
Wherein, the vertical cylindrical continuous dryer for drying sludge cake has a thermal efficiency more than about 1 time that of the conventional rotary dryer or spray dryer, and the evaporated steam is recovered in total amount of condensed water to replace the mixed water, so that no waste water is generated, thereby remarkably improving the economical efficiency of the operation of the process.
Also, the potassium chloride dryer 170 may include a vertical cylindrical continuous dryer.
The vertical cylindrical continuous dryer for drying potassium chloride may have a drying cross section on all surfaces of a vertical cylinder, and the sludge cake fed into the vertical cylindrical continuous dryer may be dried while being adhered in a thin film form to all surfaces of the vertical cylindrical continuous dryer by centrifugal force, and the sludge may be dried in such a manner as to be in a thin film form.
Wherein, the heat efficiency of the vertical cylindrical continuous dryer for drying potassium chloride is more than about 1 time better than that of the existing rotary dryer or spray dryer, and the evaporated steam is recycled in total amount of condensed water to replace the mixed water, so no waste water is generated, thereby remarkably improving the economical efficiency of the operation of the process.
The one or more dissolution mixers 120 are underground so that the upper end of the dissolution mixer 120 is level with the ground, the slurry is pumped out from the upper part of the one or more dissolution mixers 120, the one or more dissolution mixers 120 are further filled with the dryer condensate of the potassium chloride dryer 170, and the cement chlorine bypass dust can be dissolved in the dryer condensate of the potassium chloride dryer 170.
When the slurry is transferred from the dissolution mixer 120 to the slurry dehydrator 130, the slurry may be pumped out using the roller vacuum type self-priming hose pump, and the slurry may be pumped out from the upper portion of the dissolution mixer 120 to the transfer line.
The sludge cake storage 140 may be lowered to the side lower portion of the slurry dehydrator 130 to drop, store, or transfer the dehydrated sludge cake to the side lower portion of the dehydrator.
The sludge cake storage 140 is configured to put at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 into the sludge cake storage 140, and to mix the sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 to prepare a slurry, and to pump the slurry to the dissolution mixer 120 by the roller vacuum self-priming hose pump.
Among them, a dissolution mixer for dissolving chlorine bypass dust in water or an acidic aqueous solution can be used for underground formation so that the upper end portion is level with the ground. This is to reduce the sludge cake storage area generated in the slurry dehydrator to the lower side of the slurry dehydrator, and then to mix the sludge cake with water or an acidic aqueous solution to slurry the sludge cake, and to minimize the difference in height between the lower side of the sludge cake storage area and the upper end of the dissolution mixer when transferring the sludge cake to the dissolution mixer in the next round, thereby increasing the transfer convenience and the improvement in the operation rate.
Further, a transfer line for transferring the slurry after stirring in a dissolution stirrer for dissolving the chlorine bypass dust in water or an acidic aqueous solution is configured to pump the slurry from an upper portion of the dissolution stirrer. This is to eliminate clogging of the pipe which often occurs when the slurry is pumped out from the lower part due to an excessively high concentration of the slurry in the lower part of the mixer.
Moreover, the environmental protection recycling method of the cement chlorine bypass dust comprises the following steps: a step of dissolving the cement-chlorine bypass dust in at least one selected from water, an acidic aqueous solution, a supernatant of the precipitation tank of the potassium chloride precipitation tank 160, and condensed water of the potassium chloride dryer 170 in a dissolution mixer 1 as a first dissolution; a step of preparing a first regenerated slurry by mixing the first sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150, and condensed water of the potassium chloride dryer 170 after preparing the first sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the first sludge cake into the sludge cake storage; pumping the first regenerated slurry to a No. 2 dissolution mixer 120 by a roller vacuum self-priming hose pump; a step of dissolving, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 120 in at least one selected from water, an acidic aqueous solution, a supernatant liquid of the precipitation tank 160 of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer 170 to prepare a slurry; and a step of preparing a second-time regenerated slurry by mixing the second-time sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer 150 and condensed water of the potassium chloride dryer 170 after preparing a second-time sludge cake by dehydrating the slurry by the slurry dehydrator 130 and then dropping the second-time sludge cake into the sludge cake storage 140, thereby preventing scaling in a pipeline of the environment-friendly recycling system of cement-chlorine bypass dust and repeating the dissolving or dehydrating step as one or more steps.
Wherein, the above-mentioned one or more continuous circulation process or partial repetition process may be 1 to 6 times.
In this case, the recycling efficiency of the cement chlorine bypass dust may be improved as the number of repetition of the partial repetition process increases.
In the first step of dissolving, dehydrating and drying, the cement-chlorine bypass dust is placed in a dissolving mixer, and then the cement-chlorine bypass dust is dissolved in at least one selected from the group consisting of water, a supernatant of a precipitation tank of an acidic aqueous solution potassium chloride precipitation tank, and a dryer condensate of a potassium chloride dryer to form a slurry.
The slurry dissolved in the dissolution mixer may be dewatered using a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry may be pumped out by using a roller vacuum type self-priming hose pump, and the slurry may be pumped out from the upper part of the dissolution mixer to the transfer line.
The sludge cake may then be transported to a sludge cake storage site to prepare sludge for the kiln raw material.
Further, the above sludge cake may be transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
Then, the dehydrated filtrate may be transferred to a potassium chloride precipitation tank to precipitate and precipitate potassium chloride, thereby recovering potassium chloride.
The dehydrated filtrate may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
Further, the precipitate precipitated in the above potassium chloride precipitation tank may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
In this case, the conveyor line is hardly clogged, and waste water is hardly generated.
In the second partial repeating step of dissolution and dehydration, cement chlorine bypass dust may be placed in a dissolution mixer No. 1 as the first dissolution, and the cement chlorine bypass dust may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant of a precipitation tank of a potassium chloride precipitation tank, and a condensed water of a dryer of a potassium chloride dryer to form a slurry.
After that, as the first dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 1 may be dewatered using a slurry dewatering machine to separate into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry may be pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, after the first sludge cake is dropped to the sludge cake storage yard, the first sludge cake may be mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first regenerated slurry.
In this case, the first regenerated slurry may be pumped to the dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as the second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage site, and then the sludge for the kiln raw material can be prepared.
Further, the above-described second sludge cake may be transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate and the second dehydrated filtrate may be transferred to a potassium chloride precipitation tank to precipitate and precipitate potassium chloride, thereby recovering potassium chloride.
The first dehydrated filtrate and the second dehydrated filtrate may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
Further, the precipitate precipitated in the above potassium chloride precipitation tank may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
In this case, the conveyor line is hardly clogged, and waste water is hardly generated.
In the three-part repeated step of dissolution and dehydration, cement chlorine bypass dust may be placed in a dissolution mixer No. 1 as the first dissolution, and the cement chlorine bypass dust may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of the potassium chloride precipitation tank, and a condensed water of a dryer of the potassium chloride dryer to form a slurry.
After that, as the first dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 1 may be dewatered using a slurry dewatering machine to separate into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry may be pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, after the first sludge cake is dropped to the sludge cake storage site, the first sludge cake may be mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first regenerated slurry.
In this case, the first regenerated slurry may be pumped to the dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as the second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 may be dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, after the second sludge cake is dropped to the sludge cake storage yard, the second sludge cake may be mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a second regenerated slurry.
In this case, the second regenerated slurry may be pumped to the dissolution mixer No. 3 using a roller vacuum type self-priming hose pump.
Then, as a third dissolution, the second regenerated slurry transferred to the dissolution mixer No. 3 was dissolved in at least one selected from water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the third dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 3 may be dewatered using a slurry dewatering machine to separate into a third sludge cake and a third dewatered filtrate.
After that, the third sludge cake is dropped to the sludge cake storage site, and then the sludge for the kiln raw material can be prepared.
Further, the above-described third sludge cake may be transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate may be transferred to a potassium chloride precipitation tank to precipitate and precipitate potassium chloride, thereby recovering potassium chloride.
The first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
Further, the precipitate precipitated in the above potassium chloride precipitation tank may be transferred to a potassium chloride dryer and dried to recover potassium chloride.
In this case, the conveyor line is hardly clogged, and waste water is hardly generated.
In the above-described method for environmentally friendly recycling of cement chlorine bypass dust, when the dissolving or dehydrating step is performed as a partial repetition step and a continuous circulation step of one or more times, the dissolving time can be shortened as the number of repeated dissolving or dehydrating steps increases.
The potassium chloride precipitation tank 160 may be provided with a heating device at a constant time or at any time such as a heating power pipe or a steam pipe at the bottom and the side.
The potassium chloride precipitation tank 160 may be charged with an aggregating agent containing at least one selected from the group consisting of slaked lime (calcium hydroxide), alum, aluminum chloride, ferric oxide, and ferrous sulfate as an inorganic electrolyte, and starch, polyacrylamide, and derivatives thereof as an organic polymer compound.
In the method for recycling the cement chlorine bypass dust, in order to shorten the time for precipitating potassium chloride crystals in the potassium chloride precipitation tank 160, the potassium chloride crystals are precipitated and precipitated from the dehydrated filtrate transferred to the potassium chloride precipitation tank 160, and the supernatant liquid of the precipitation tank 160 is pumped by a roller vacuum type self-priming hose pump or a submersible pump at the time point of generating the supernatant liquid of the precipitation tank, thereby being used as the mixing water for dissolving the dissolution stirrer 120.
In the repeated process of dissolving chlorine bypass dust in water or acid aqueous solution and separating and dehydrating water or aqueous solution from sludge, the subsequent conveying line of dehydrated filtrate generated in the slurry dehydrator can be divided into a potassium chloride sedimentation tank and a potassium chloride dryer independently of the dehydration times so as to be capable of being independently or simultaneously conveyed.
In the repeated process of dissolving the chlorine bypass dust in water or an acidic aqueous solution and separating and dehydrating the water or the aqueous solution from the sludge, the dehydrated filtrate produced in the slurry dehydrator can be transferred to the potassium chloride precipitation tank. This is to minimize the potassium chloride dryer operation process or maximize the economy by improving the drying efficiency.
In order to facilitate the evaporation of water, the bottom and the side of the potassium chloride sedimentation tank can be provided with a heating device such as a heating pipeline or a steam pipeline at any time or at any time. This is to adjust the time for precipitation of potassium chloride crystals according to the change in the time required for supersaturation of potassium chloride by evaporation of water from the dehydrated filtrate, depending on whether the heating apparatus is operated or not.
In order to further shorten the precipitation time of potassium chloride crystals, the coagulant may be added to the dehydrated filtrate transferred to the potassium chloride precipitation tank, and the addition amount may be adjusted. This is to promote sedimentation by accelerating sedimentation velocity of potassium chloride particles precipitated from crystals in a liquid.
Further, in order to further shorten the potassium chloride crystal precipitation time, the supernatant may be removed by pumping using a roller vacuum type self-priming hose pump at the time point of precipitating and settling potassium chloride crystals in the dehydrated filtrate transferred to the potassium chloride precipitation tank and generating the supernatant of the precipitation tank, or transferred to a dissolution mixer to be used as the mixed water for dissolution.
In order to fundamentally eliminate the generation of wastewater, the method for recycling the cement chlorine bypass dust may transfer the condensed water of the sludge cake dryer 150 or the condensed water of the potassium chloride dryer 170 to be used as the mixing water for dissolving the dissolution mixer 120 and the mixing water for preparing the regenerated slurry of the sludge cake in the sludge cake storage 140.
In addition, in the method for recycling the cement chlorine bypass dust in an environment-friendly manner, sludge cakes generated in the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from sludge can be transferred to an underground storage yard at the lower part of the side surface of the slurry dehydrator and then transferred to a sludge cake dryer, so that the water content is reduced to below 5%, and the dried sludge for the high-added-value cement auxiliary material can be prepared.
In the repeated process of separating and dewatering water or water solution from sludge, sludge cake produced in the slurry dewatering machine is transferred to the underground storage site below the side of the slurry dewatering machine, and the subsequent conveying line consists of two lines of sludge cake drier and product sludge storage site, and may be transferred separately or simultaneously.
Potassium chloride recovered by environment-friendly recycling system of cement chlorine bypass dust
The invention provides the potassium chloride recovered by the environment-friendly recycling system of the cement chlorine bypass dust.
The invention provides the potassium chloride recovered by the environment-friendly recycling system of the cement chlorine bypass dust, which has economical efficiency.
Sludge with reduced chlorine concentration prepared by environment-friendly recycling system of cement chlorine bypass dust
The invention provides the sludge with reduced chlorine concentration prepared by the environment-friendly recycling system of cement chlorine bypass dust.
The invention provides the sludge with reduced chlorine concentration prepared by the environment-friendly recycling system for cement chlorine bypass dust, which has economy.
Potassium chloride recovered by environment-friendly recycling method of cement chlorine bypass dust
The invention provides the potassium chloride recovered by the environmental protection recycling method of the cement chlorine bypass dust.
The invention provides the potassium chloride recovered by the environment-friendly recycling method of the cement chlorine bypass dust, and the method has economical efficiency.
Sludge with reduced chlorine concentration prepared by environment-friendly recycling method of cement chlorine bypass dust
The invention provides the sludge with reduced chlorine concentration prepared by the environment-friendly recycling method of the cement chlorine bypass dust.
The invention provides the sludge with reduced chlorine concentration prepared by the environment-friendly recycling method of the cement chlorine bypass dust, which has economy.
Hereinafter, the present invention will be described in more detail with reference to examples. However, the following examples are only for more specifically explaining the present invention, and the scope of the present invention is not limited to the following examples. The following embodiments may be appropriately modified and changed within the scope of the present invention by one of ordinary skill in the art to which the present invention pertains.
Examples
Example 1. Environment-friendly method for recycling 2 hours of the one-step dissolution-dehydration-precipitation Using an Environment-friendly recycle System of Cement chlorine bypass dust having chlorine content of 189000ppm
Cement chlorine bypass dust with chlorine content of 189000ppm is put into a dissolution mixer, and the cement chlorine bypass dust is dissolved in water, an acidic aqueous solution and a supernatant fluid of a sedimentation tank of a potassium chloride sedimentation tank for 2 hours to form slurry.
Then, the slurry dissolved in the dissolution mixer is dewatered by a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the above dehydrated filtrate was transferred to a potassium chloride precipitation tank containing slaked lime (calcium hydroxide) as an coagulant to recover potassium chloride by precipitation and sedimentation of potassium chloride crystals.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental protection recovery method of the one-step process of 2 hours dissolution-dehydration-precipitation is 75.5%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 2 environmentally friendly recycling method for one 2 hour dissolution-dehydration-precipitation-drying process using Cement chlorine bypass dust with chlorine content of 189000ppm
Cement chlorine bypass dust with the chlorine content of 189000ppm is placed into a dissolution mixer, and the cement chlorine bypass dust is dissolved in water, an acidic aqueous solution, a supernatant fluid of a sedimentation tank of a potassium chloride sedimentation tank and condensed water of a potassium chloride dryer for 2 hours to form slurry.
Then, the slurry dissolved in the dissolution mixer is dewatered by a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the sludge cake is transported to a sludge cake storage site to prepare sludge for firing kiln raw materials.
Thereafter, the sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
Then, the above dehydrated filtrate was transferred to a potassium chloride precipitation tank containing slaked lime (calcium hydroxide) as an coagulant to recover potassium chloride by precipitation and sedimentation of potassium chloride crystals.
Thereafter, the precipitate precipitated in the above potassium chloride precipitation tank was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and dried to recover potassium chloride.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental protection recovery method of the one-step process of 2 hours dissolution-dehydration-precipitation-drying is 77.5%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 3 environmentally friendly recycling method for one 3 hour dissolution-dehydration-precipitation-drying process using Cement chlorine bypass dust with chlorine content of 189000ppm
The same procedure as in example 2 was repeated except that cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of a potassium chloride precipitation tank, and condensed water of a potassium chloride dryer for 3 hours to form a slurry.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental protection recovery method of the one-step process of 3 hours dissolution-dehydration-precipitation-drying is 81.5%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 4 environmental protection recycling method of 2 hour dissolution-dehydration-drying one step Using Cement chlorine bypass dust with chlorine content of 189000ppm
Cement chlorine bypass dust with the chlorine content of 189000ppm is placed into a dissolution mixer, and the cement chlorine bypass dust is dissolved in water, an acidic aqueous solution, a supernatant fluid of a sedimentation tank of a potassium chloride sedimentation tank and condensed water of a potassium chloride dryer for 2 hours to form slurry.
Then, the slurry dissolved in the dissolution mixer is dewatered by a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the sludge cake is transported to a sludge cake storage site to prepare sludge for firing kiln raw materials.
Thereafter, the sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
Then, the above dehydrated filtrate was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and potassium chloride was dried to recover potassium chloride.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental protection recovery method of the primary process of 2 hours dissolution-dehydration-drying is 75.5%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 5 environmentally friendly recycling method of 2 hour dissolution-De-precipitation-Dry Secondary dissolution-De-Water partial repeat Process Using Cement chlorine bypass dust with chlorine content of 189000ppm
As the first dissolution, cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer No. 1, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution and condensed water of a potassium chloride dryer for 2 hours to form a slurry.
Then, as the first dewatering, the slurry dissolved in the dissolution mixer No. 1 was dewatered by using a slurry dewatering machine, and separated into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the first-time sludge cake is dropped to the sludge cake storage yard, and then the first-time sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first-time regenerated slurry.
In this case, the first regenerated slurry was pumped to a dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage site, and then a kiln raw material sludge is prepared.
Further, the above-mentioned second sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate and the second dehydrated filtrate are transferred to a potassium chloride precipitation tank containing polyacrylamide as an aggregating agent, and potassium chloride is recovered by precipitation and sedimentation of potassium chloride crystals.
Further, the precipitate precipitated in the above potassium chloride precipitation tank was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and dried to recover potassium chloride.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental-friendly recovery method of 2-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration partial repetition process is 88.6%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 6. Environmentally friendly recycling method of 3 hour dissolution-De-precipitation-Dry Secondary dissolution-De-partial repeat Process Using Cement chlorine bypass dust with chlorine content of 189000ppm
The same procedure as in example 5 was repeated except that cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of a potassium chloride precipitation tank, and condensed water of a potassium chloride dryer for 3 hours to form a slurry.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental-friendly recovery method of 3-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration partial repetition process is 96.5%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 7 environmental protection recycling method of 2 hour dissolution-dehydration-drying Secondary dissolution-dehydration partial repeat Process Using environmental protection recycling System of Cement chlorine bypass dust having chlorine content of 189000ppm
As the first dissolution, cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer No. 1, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution and condensed water of a potassium chloride dryer for 2 hours to form a slurry.
Then, as the first dewatering, the slurry dissolved in the dissolution mixer No. 1 was dewatered by using a slurry dewatering machine, and separated into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the first-time sludge cake is dropped to the sludge cake storage yard, and then the first-time sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first-time regenerated slurry.
In this case, the first regenerated slurry was pumped to a dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage site, and then a kiln raw material sludge is prepared.
Further, the above-mentioned second sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the above-mentioned first dehydrated filtrate and the above-mentioned second dehydrated filtrate are transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and potassium chloride is dried to recover potassium chloride.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental-friendly recovery method of 2-hour dissolution-dehydration-drying secondary dissolution-dehydration partial repetition process is 85.6%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 8 environmental protection recycling method of 2 hour dissolution-De-precipitation-Dry triple dissolution-De-Water partial repeat Process Using Cement chlorine bypass dust with chlorine content of 189000ppm
As the first dissolution, cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer No. 1, and the cement chlorine bypass dust was dissolved in water, a supernatant of a precipitation tank of an acidic aqueous solution potassium chloride precipitation tank, and condensed water of a potassium chloride dryer for 2 hours to form a slurry.
Then, as the first dewatering, the slurry dissolved in the dissolution mixer No. 1 was dewatered by using a slurry dewatering machine, and separated into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the first-time sludge cake is dropped to the sludge cake storage yard, and then the first-time sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first-time regenerated slurry.
In this case, the first regenerated slurry was pumped to a dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, after the second sludge cake is dropped to the sludge cake storage yard, the second sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a second regenerated slurry.
In this case, the second regenerated slurry was pumped to the dissolution mixer No. 3 using a roller vacuum type self-priming hose pump.
Then, as a third dissolution, the second regenerated slurry transferred to the dissolution mixer No. 3 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the third dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 3 was dewatered using a slurry dewatering machine to separate into a third sludge cake and a third dewatered filtrate.
Then, the third sludge cake is dropped to the sludge cake storage site, and the sludge for the kiln raw material is prepared.
Further, the above-mentioned third sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate are transferred to a potassium chloride precipitation tank containing aluminum chloride as an aggregating agent, and potassium chloride is recovered by precipitation and sedimentation of potassium chloride crystals.
Further, the precipitate precipitated in the above potassium chloride precipitation tank was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and dried to recover potassium chloride.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental-friendly recovery method of the three dissolution-dehydration part repeating process of 2 hours dissolution-dehydration-precipitation-drying is 97.6%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 9 environmental protection recycling method of 3 hour dissolution-De-precipitation-Dry triple dissolution-De-portion repeat Process Using Cement chlorine bypass dust with chlorine content of 189000ppm
The same procedure as in example 8 was repeated except that cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution and condensed water of a potassium chloride dryer for 3 hours to form a slurry.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental protection recovery method of the three dissolution-dehydration partial repetition process of 3 hours dissolution-dehydration is 98.3%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 10 environmentally friendly recycling method of a 2 hour dissolution-dehydrate-Dry triple dissolution-dehydrate partial repeat process Using Cement chlorine bypass dust with chlorine content of 189000ppm
As the first dissolution, cement chlorine bypass dust having a chlorine content of 189000ppm was placed in a dissolution mixer No. 1, and then the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, a supernatant of a precipitation tank of a potassium chloride precipitation tank, and condensed water of a potassium chloride dryer and for 2 hours to form a slurry.
Then, as the first dewatering, the slurry dissolved in the dissolution mixer No. 1 was dewatered by using a slurry dewatering machine, and separated into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the first-time sludge cake is dropped to the sludge cake storage yard, and then the first-time sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first-time regenerated slurry.
In this case, the first regenerated slurry was pumped to a dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage area, and then the second sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a second regenerated slurry.
In this case, the second regenerated slurry was pumped to the dissolution mixer No. 3 using a roller vacuum type self-priming hose pump.
Then, as a third dissolution, the second regenerated slurry transferred to the dissolution mixer No. 3 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the third dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 3 was dewatered using a slurry dewatering machine to separate into a third sludge cake and a third dewatered filtrate.
Then, the third sludge cake is dropped to the sludge cake storage site, and the sludge for the kiln raw material is prepared.
Further, the above-mentioned third sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate are transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer to dry potassium chloride and recover potassium chloride.
Wherein the recovery rate of the potassium chloride recovered by the above-mentioned environmental-friendly recovery method of the 3-hour dissolution-dehydration-drying three-time dissolution-dehydration partial repetition process is 95.6%.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 11 environmental protection recycling method of 2 hour dissolution-dehydration-precipitation one step Using environmental protection recycling System of Cement chlorine bypass dust with chlorine content of 220000ppm
Cement chlorine bypass dust having a chlorine content of 220000ppm was put into a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, and a supernatant of a precipitation tank of a potassium chloride precipitation tank 160 for 2 hours to form a slurry.
Then, the slurry dissolved in the dissolution mixer is dewatered by a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the above dehydrated filtrate was transferred to a potassium chloride precipitation tank containing polyacrylamide as an coagulant to recover potassium chloride by precipitation and sedimentation of potassium chloride crystals.
Wherein the chlorine content of the sludge for raw materials of the firing kiln prepared by the above-mentioned one-step process of 2 hours dissolution-dehydration-precipitation is 45000ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 12 environmental protection recycling method of 2 hour dissolution-dehydration-precipitation-drying one step Using Cement chlorine bypass dust with chlorine content of 220000ppm
Cement chlorine bypass dust having a chlorine content of 220000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, and condensed water of a potassium chloride dryer for 2 hours to form a slurry.
Then, the slurry dissolved in the dissolution mixer is dewatered by a slurry dewatering machine to separate a sludge cake and a dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the sludge cake is transported to a sludge cake storage site to prepare sludge for firing kiln raw materials.
Thereafter, the sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
Then, the above dehydrated filtrate was transferred to a potassium chloride precipitation tank containing polyacrylamide as an coagulant to recover potassium chloride by precipitation and sedimentation of potassium chloride crystals.
Thereafter, the precipitate precipitated in the above potassium chloride precipitation tank was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and dried to recover potassium chloride.
Wherein the chlorine content of the sludge for kiln raw material prepared by the above-mentioned one-step process of 2 hours dissolution-dehydration-precipitation-drying is 43000ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 13 environmental protection recycling method of 3 hours dissolving-dehydrating-precipitating-drying one step Using Cement chlorine bypass dust with chlorine content of 220000ppm
The same procedure as in example 12 was repeated except that cement chlorine bypass dust having a chlorine content of 220000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, a supernatant liquid of a precipitation tank of a potassium chloride precipitation tank, and condensed water of a potassium chloride dryer for 3 hours to form a slurry.
Wherein the chlorine content of the sludge for kiln raw materials prepared by the above-mentioned one-step process of 3 hours dissolution-dehydration-precipitation-drying is 26000ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 14 environmental protection recycling method of 2 hour dissolution-De-precipitation-Dry Secondary dissolution-De-Water partial repeat Process Using an environmental protection recycle System of Cement chlorine bypass dust with chlorine content of 220000ppm
As the first dissolution, cement chlorine bypass dust having a chlorine content of 220000ppm was placed in a dissolution mixer No. 1, and the cement chlorine bypass dust was dissolved in water, a supernatant of a precipitation tank of an acidic aqueous solution potassium chloride precipitation tank, and condensed water of a potassium chloride dryer for 2 hours to form a slurry.
Then, as the first dewatering, the slurry dissolved in the dissolution mixer No. 1 was dewatered by using a slurry dewatering machine, and separated into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the first-time sludge cake is dropped to the sludge cake storage yard, and then the first-time sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first-time regenerated slurry.
In this case, the first regenerated slurry was pumped to a dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage site, and then a kiln raw material sludge is prepared.
Further, the above-mentioned second sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate and the second dehydrated filtrate are transferred to a potassium chloride precipitation tank containing polyacrylamide as an aggregating agent, and potassium chloride is recovered by precipitation and sedimentation of potassium chloride crystals.
Further, the precipitate precipitated in the above potassium chloride precipitation tank was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and dried to recover potassium chloride.
Wherein the chlorine content of the sludge for the raw material of the firing kiln prepared by the above-mentioned environmental protection recycling method of 2 hours dissolution-dehydration-precipitation-drying secondary dissolution-dehydration part repetition process is 21000ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 15 environmentally friendly recycling method of 3 hour dissolution-De-precipitation-Dry Secondary dissolution-De-Water partial repeat Process Using Cement chlorine bypass dust with chlorine content of 220000ppm
The same procedure as in example 14 was repeated except that cement chlorine bypass dust having a chlorine content of 220000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution and a supernatant liquid of a precipitation tank of a potassium chloride precipitation tank for 3 hours to form a slurry.
Wherein the chlorine content of the sludge for the raw material of the firing kiln prepared by the above-mentioned environmental protection recycling method of 3-hour dissolution-dehydration-precipitation-drying secondary dissolution-dehydration part repetition process is 4200ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Example 16 environmental protection recycling method of 2 hour dissolution-De-precipitation-Dry triple dissolution-De-partial repeat Process Using Cement chlorine bypass dust with chlorine content of 220000ppm
As the first dissolution, cement chlorine bypass dust having a chlorine content of 220000ppm was placed in a dissolution mixer No. 1, and the cement chlorine bypass dust was dissolved in water, an acidic aqueous solution, a supernatant of a precipitation tank of a potassium chloride precipitation tank, and condensed water of a potassium chloride dryer for 2 hours to form a slurry.
Then, as the first dewatering, the slurry dissolved in the dissolution mixer No. 1 was dewatered by using a slurry dewatering machine, and separated into a first sludge cake and a first dewatered filtrate.
In this case, when the slurry is transferred from the dissolution mixer No. 1 to the slurry dehydrator, the slurry is pumped out from the upper part of the dissolution mixer No. 1 to the transfer line by using a roller vacuum type self-priming hose pump.
Then, the first-time sludge cake is dropped to the sludge cake storage yard, and then the first-time sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a first-time regenerated slurry.
In this case, the first regenerated slurry was pumped to a dissolution mixer No. 2 using a roller vacuum type self-priming hose pump.
Then, as a second dissolution, the first regenerated slurry transferred to the dissolution mixer No. 2 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the second dewatering, the slurry dissolved in the dissolution mixer No. 2 was dewatered by using a slurry dewatering machine, and separated into a second sludge cake and a second dewatered filtrate.
Then, the second sludge cake is dropped to the sludge cake storage area, and then the second sludge cake is mixed with water, an acidic aqueous solution, condensed water of the sludge cake dryer, and condensed water of the potassium chloride dryer to prepare a second regenerated slurry.
In this case, the second regenerated slurry was pumped to the dissolution mixer No. 3 using a roller vacuum type self-priming hose pump.
Then, as a third dissolution, the second regenerated slurry transferred to the dissolution mixer No. 3 was dissolved in water, an acidic aqueous solution, a supernatant liquid of the precipitation tank of the potassium chloride precipitation tank, and condensed water of the potassium chloride dryer to prepare a slurry.
Then, as the third dewatering, the slurry dissolved in the above-mentioned dissolution mixer No. 3 was dewatered using a slurry dewatering machine to separate into a third sludge cake and a third dewatered filtrate.
Then, the third sludge cake is dropped to the sludge cake storage site, and the sludge for the kiln raw material is prepared.
Further, the above-mentioned third sludge cake is transferred to a sludge cake dryer to prepare dried sludge for cement auxiliary materials having a reduced chlorine concentration for use as a cement raw material.
In this case, the first dehydrated filtrate, the second dehydrated filtrate, and the third dehydrated filtrate are transferred to a potassium chloride precipitation tank containing slaked lime (calcium hydroxide) as an coagulant to recover potassium chloride by precipitation and sedimentation of potassium chloride crystals.
Further, the precipitate precipitated in the above potassium chloride precipitation tank was transferred to a potassium chloride dryer as a vertical cylindrical continuous dryer and dried to recover potassium chloride.
Wherein the chlorine content of the sludge for the raw material of the firing kiln prepared by the above-mentioned environmental protection recycling method of the repeated procedures of the three dissolution-dehydration-precipitation-drying steps for 2 hours is 4400ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
EXAMPLE 17 Environment friendly recycling method Using 3 hour dissolution-De-precipitation-Dry triple dissolution-De-Water partial repeat procedure of Environment friendly recycle System of Cement chlorine bypass dust with chlorine content of 220000ppm
The same procedure as in example 16 was conducted except that cement chlorine bypass dust having a chlorine content of 220000ppm was placed in a dissolution mixer, and the cement chlorine bypass dust was dissolved in water, the supernatant liquid of the precipitation tank of the acidic aqueous solution potassium chloride precipitation tank and the condensed water of the potassium chloride dryer for 3 hours to form a slurry.
Wherein the chlorine content of the sludge for the raw material of the firing kiln prepared by the above-mentioned environmental protection recycling method of three-time dissolution-dehydration-precipitation-drying repeated procedures of 3 hours is 2200ppm.
In addition, the conveyor line is hardly clogged, and almost no waste water is generated.
Comparative example 1 chlorine bypass dust recycling method
In order to perform the separation, dehydration and drying steps in a state of a solution, slurry or sludge having a moisture content of about 60% of the chlorine bypass dust, the chlorine bypass dust is transferred by pumping through a pipe. In the drying step, a spin dryer is used for drying.
In this case, clogging of the conveyor line often occurs, and wastewater is generated in several tens of tons per day.
Comparative example 2 chlorine bypass dust recycling method
In order to perform the separation, dehydration and drying steps in a state of a solution, slurry or sludge having a moisture content of about 60% of the chlorine bypass dust, the chlorine bypass dust is transferred by pumping through a pipe. In the drying step, a spray dryer is used for drying.
In this case, overload of the conveyor line often occurs, and wastewater is produced in tens of tons per day.
While the specific embodiments of the system and method for recycling cement chlorine bypass dust according to the present invention have been described above, it is obvious that various modifications can be made without departing from the scope of the invention.
Thus, the scope of the invention should not be limited to the embodiments described, but should be defined by the scope of the appended claims and equivalents thereof.
That is, the foregoing embodiments are merely illustrative of all aspects and should not be construed as limiting the invention, and the scope of the invention is shown by the appended claims rather than by the detailed description, and all changes or modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (20)
1. An environment-friendly recycling system for cement chlorine bypass dust is characterized in that,
comprising the following steps:
one or more dissolution mixers (120) for placing cement-chlorine bypass dust, and then dissolving the cement-chlorine bypass dust in at least one of the supernatant of a sedimentation tank selected from the group consisting of water, an acidic aqueous solution and a potassium chloride sedimentation tank (160) to form a slurry;
a slurry dehydrator (130) for separating the slurry dissolved in the dissolution mixer into a sludge cake and a dehydrated filtrate; and
more than one potassium chloride sedimentation tank (160), transferring the dehydrated filtrate, recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals,
When the slurry is transferred from the dissolution mixer (120) to the slurry dehydrator (130), the slurry is pumped out by using a roller vacuum type self-priming hose pump,
the environment-friendly recycling system for cement chlorine bypass dust is used for preventing scaling in a pipeline by pumping out the cement chlorine bypass dust by using the roller vacuum self-priming hose pump, and takes the dissolving or dehydrating process as one or more part of repeated processes or continuous circulating processes.
2. The system for environmental protection recycling of cement chlorine bypass dust according to claim 1, further comprising:
a sludge cake storage yard (140) for transferring the sludge cake thereto;
one or more sludge cake dryers (150) for drying sludge cakes in the sludge cake storage yard to form sludge having a reduced chlorine concentration used as a cement raw material; and
one or more potassium chloride dryers (170) for recovering potassium chloride by drying the dehydrated filtrate; or the potassium chloride is recovered by transferring and drying the sediment precipitated in the potassium chloride precipitation tank (160).
3. The system for environmentally friendly recycling of cement chlorine bypass dust according to claim 2, wherein the sludge cake storage yard (140) is formed into a lower side surface of the slurry dehydrator (130), and the dehydrated sludge cake is dropped, stored or transferred to the lower side surface storage yard of the dehydrator.
4. The environment-friendly recycling system of cement chlorine bypass dust according to claim 2, wherein,
the sludge cake storage yard (140) is configured to put at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer (150) and condensed water of the potassium chloride dryer (170) into the sludge cake storage yard (140),
the sludge cake is mixed with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer (150) and condensed water of the potassium chloride dryer (170) to prepare a slurry, and the slurry is pumped to the dissolution mixer (120) by the roller vacuum type self-priming hose pump.
5. The environment-friendly recycling system of cement chlorine bypass dust according to claim 2, wherein,
the above-mentioned one or more dissolving agitators (120) of the above-mentioned cement chlorine bypass dust environmental protection recycling system are underground in a way that the upper end part of the above-mentioned dissolving agitators (120) is horizontal with the ground,
the slurry is pumped out from the upper part of the one or more dissolution mixers (120),
and placing the one or more dissolution mixers (120) with the dryer condensate of the potassium chloride dryer (170), wherein the cement chlorine bypass dust is dissolved in the dryer condensate of the potassium chloride dryer (170).
6. The environment-friendly recycling system of cement chlorine bypass dust as claimed in claim 5, wherein,
above-mentioned environmental protection recycle system of cement chlorine bypass dust includes:
a step of dissolving the cement-chlorine bypass dust in at least one selected from water, an acidic aqueous solution, a supernatant of a precipitation tank of the potassium chloride precipitation tank (160), and condensed water of the potassium chloride dryer (170) in a dissolution mixer (120) as a first dissolution to prepare a slurry;
a step of preparing a first regenerated slurry by, as a first dewatering, dewatering the slurry by the slurry dewatering machine (130) to prepare a first sludge cake, dropping the first sludge cake into the sludge cake storage site, and mixing the first sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake drying machine (150), and condensed water of the potassium chloride drying machine (170);
pumping the first regenerated slurry to a No. 2 dissolution mixer (120) by a roller vacuum self-priming hose pump;
dissolving, as a second dissolution, a first regenerated slurry transferred to the dissolution mixer No. 2 (120) in at least one selected from water, an acidic aqueous solution, a supernatant of a precipitation tank of the potassium chloride precipitation tank (160), and condensed water of the potassium chloride dryer (170) to prepare a slurry; and
A step of preparing a second regenerated slurry by dehydrating the slurry by the slurry dehydrator (130) as a second dehydration, dropping the second sludge cake into the sludge cake storage site (140), and mixing the second sludge cake with at least one selected from water, an acidic aqueous solution, condensed water of the sludge cake dryer (150) and condensed water of the potassium chloride dryer (170),
thus, the process of preventing scaling in the pipeline of the environment-friendly recycling system of cement chlorine bypass dust and dissolving or dehydrating is carried out as a part of repeated process and continuous circulating process.
7. The system for environmentally friendly recycling of cement chlorine bypass dust according to claim 1, wherein when the step of dissolving or dehydrating the cement chlorine bypass dust is performed as one or more partial repetition steps and continuous circulation steps, the dissolving time is shortened as the number of repeated dissolving or dehydrating steps increases.
8. The system for recycling cement chlorine bypass dust according to claim 1, wherein the potassium chloride sedimentation tank (160) is provided with a heating device at regular or instant time of a heating pipeline or a steam pipeline at the bottom and the side.
9. The environment-friendly recycling system of cement chlorine bypass dust according to claim 1, wherein,
the potassium chloride sedimentation tank (160) can be filled with an agglutinant,
the coagulant contains at least one selected from calcium hydroxide, alum, aluminum chloride, ferric oxide and ferrous sulfate as an inorganic electrolyte, or starch or polyacrylamide and its derivatives as an organic polymer compound.
10. The system according to claim 1, wherein the system for environmentally friendly recycling of cement chlorine bypass dust is configured to use a roller vacuum type self-priming hose pump or a submersible pump to pump a supernatant of a precipitation tank of the potassium chloride precipitation tank (160) as a mixing water for dissolving the dissolving mixer (120) at a time point when the supernatant of the precipitation tank is generated, while precipitating and settling potassium chloride crystals from a dehydrated filtrate transferred to the potassium chloride precipitation tank (160) in order to shorten a precipitation time of potassium chloride crystals in the potassium chloride precipitation tank (160).
11. The system according to claim 2, wherein the condensed water of the sludge cake dryer (150) or the condensed water of the potassium chloride dryer (170) is transferred to be used as the mixed water for dissolution of the dissolution mixer (120) and the mixed water for preparation of regenerated slurry of sludge cake in the sludge cake storage (140) in order to fundamentally eliminate the generation of waste water.
12. The system for environmentally friendly recycling of cement chlorine bypass dust according to claim 2, wherein the subsequent transfer line is further composed of two lines of a sludge cake dryer (150) and a product sludge storage site (180) after transferring sludge cake generated in the slurry dehydrator to the underground storage site at the lower side of the slurry dehydrator in the repeated process of separating and dehydrating water or aqueous solution from sludge.
13. The system for environmentally friendly recycling of cement chlorine bypass dust according to claim 1, wherein the system for environmentally friendly recycling of cement chlorine bypass dust is characterized in that a sludge cake generated in a slurry dehydrator in a repeated process of separating and dehydrating water or an aqueous solution from sludge is transferred to an underground storage at a side lower part of the slurry dehydrator, and then transferred to a sludge cake dryer to reduce the moisture content to 5% or less, thereby preparing dry sludge for high value-added cement auxiliary materials.
14. An environment-friendly recycling method for cement chlorine bypass dust is characterized in that,
comprising the following steps:
step S110, after cement chlorine bypass dust is put into more than one dissolution mixer (120), the cement chlorine bypass dust is dissolved in at least one of the supernatant liquid of a sedimentation tank selected from water, an acidic aqueous solution and a potassium chloride sedimentation tank (160) to form slurry;
Step S120 of transferring the slurry dissolved in the dissolution mixer (120) to a slurry dehydrator (130) to separate the slurry into a sludge cake and a dehydrated filtrate; and
step S130, transferring the dehydrated filtrate to at least one potassium chloride sedimentation tank (160), recovering potassium chloride by precipitation and sedimentation of potassium chloride crystals,
when the slurry is transferred from the dissolution mixer (120) to the slurry dehydrator (130), the slurry is pumped out by using a roller vacuum type self-priming hose pump,
the method for recycling the cement chlorine bypass dust in an environment-friendly way is carried out by using the roller vacuum type self-priming hose pump to pump out to prevent scaling in a pipeline and taking the dissolving or dehydrating process as one or more part of repeated processes or continuous circulation processes.
15. The environmentally friendly recycling method of cement chlorine bypass dust according to claim 14, further comprising:
step S140, transferring the dehydrated filtrate separated in the slurry dehydrator (130) to one or more potassium chloride dryers (170) and drying to recover potassium chloride; or alternatively
And step S150, transferring the sedimentation tank sediment precipitated in the potassium chloride sedimentation tank (160) to more than one potassium chloride dryer (170) and drying to recover potassium chloride.
16. The environmentally friendly recycling method of cement chlorine bypass dust according to claim 14, further comprising:
step S160, transferring the sludge cake to a sludge cake storage yard (140) to prepare sludge for raw materials of a firing kiln; or alternatively
Step S170, the sludge cake is transferred to a sludge cake dryer (150) to prepare dry sludge for cement auxiliary materials.
17. The environmentally friendly recycling method of cement chlorine bypass dust according to claim 14, further comprising:
step S180, placing the supernatant of the sedimentation tank of the potassium chloride sedimentation tank (160) or the condensed water of the dryer of the potassium chloride dryer (170) into the dissolution mixer (120) together with water or acidic aqueous solution; or alternatively
And step S190, after the dryer condensed water of the potassium chloride dryer (170) or the dryer condensed water of the sludge cake dryer (150) is put into the sludge cake storage (140), at least one selected from water, an acidic aqueous solution, the condensed water of the sludge cake dryer (150) and the condensed water of the potassium chloride dryer (170) is put into the sludge cake of the sludge cake storage (140) to prepare a regenerated slurry, and then the regenerated slurry is transferred to the dissolution mixer (120).
18. The method for environmental protection recycling of cement chlorine bypass dust according to claim 14, which is characterized in that,
the potassium chloride sedimentation tank (160) can be filled with an agglutinant,
the coagulant contains at least one selected from calcium hydroxide, alum, aluminum chloride, ferric oxide and ferrous sulfate as an inorganic electrolyte, or starch or polyacrylamide and its derivatives as an organic polymer compound.
19. The method for environmental protection recycling of cement chlorine bypass dust according to claim 14, which is characterized in that,
the one or more dissolution mixers (120) are underground so that the upper end of the dissolution mixer (120) is level with the ground,
the slurry is pumped out from the upper part of the one or more dissolution mixers (120),
and placing the above-mentioned more than one dissolving stirrer (120) into the drier condensed water of potassium chloride drier (170), and dissolving the above-mentioned cement chlorine bypass dust into the drier condensed water of the above-mentioned potassium chloride drier (170).
20. The potassium chloride is recovered by the environment-friendly recycling system of cement chlorine bypass dust according to claim 1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020220103546A KR102526729B1 (en) | 2022-08-18 | 2022-08-18 | Eco-friendly recycling system and eco-friendly recycling method of cement chlorine bypass dust |
| KR10-2022-0103546 | 2022-08-18 |
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| Publication Number | Publication Date |
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| CN117585873A true CN117585873A (en) | 2024-02-23 |
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| CN202310974983.8A Pending CN117585873A (en) | 2022-08-18 | 2023-08-04 | Environment-friendly recycling system and environment-friendly recycling method for cement chlorine bypass dust |
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| Country | Link |
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| JP (1) | JP2024028151A (en) |
| KR (1) | KR102526729B1 (en) |
| CN (1) | CN117585873A (en) |
| WO (1) | WO2024039019A1 (en) |
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| KR102526729B1 (en) * | 2022-08-18 | 2023-04-27 | 정재묵 | Eco-friendly recycling system and eco-friendly recycling method of cement chlorine bypass dust |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101561637B1 (en) | 2014-09-25 | 2015-10-22 | 쌍용양회공업(주) | Recovery of Pottasium Chloride from Cl by pass Dust |
| KR101789701B1 (en) * | 2016-05-31 | 2017-10-25 | 한국세라믹기술원 | Manufacturing method of potassium chloride using cement bypass dust |
| KR101968111B1 (en) * | 2017-09-28 | 2019-08-13 | 성신양회 주식회사 | Method for producing potassium chloride using cement bypass dust |
| JP2019127421A (en) * | 2018-01-25 | 2019-08-01 | 公益財団法人 塩事業センター | Method for producing low sodium edible salt and low sodium edible salt |
| KR102094398B1 (en) * | 2018-05-24 | 2020-03-27 | 최윤진 | Method of recycling chlorine bypass dust generated in cement manufacturing process |
| KR102526729B1 (en) * | 2022-08-18 | 2023-04-27 | 정재묵 | Eco-friendly recycling system and eco-friendly recycling method of cement chlorine bypass dust |
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- 2022-08-18 KR KR1020220103546A patent/KR102526729B1/en active IP Right Grant
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- 2023-06-07 WO PCT/KR2023/007723 patent/WO2024039019A1/en unknown
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- 2023-08-04 CN CN202310974983.8A patent/CN117585873A/en active Pending
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| KR102526729B1 (en) | 2023-04-27 |
| WO2024039019A1 (en) | 2024-02-22 |
| JP2024028151A (en) | 2024-03-01 |
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