CN112456832A - Treatment method of salt mud containing high calcium sulfate - Google Patents
Treatment method of salt mud containing high calcium sulfate Download PDFInfo
- Publication number
- CN112456832A CN112456832A CN202011424938.8A CN202011424938A CN112456832A CN 112456832 A CN112456832 A CN 112456832A CN 202011424938 A CN202011424938 A CN 202011424938A CN 112456832 A CN112456832 A CN 112456832A
- Authority
- CN
- China
- Prior art keywords
- screen
- stage
- undersize
- salt
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 150000003839 salts Chemical class 0.000 title claims abstract description 87
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 35
- 238000005406 washing Methods 0.000 claims abstract description 32
- 238000012216 screening Methods 0.000 claims abstract description 31
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 238000004537 pulping Methods 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 239000010802 sludge Substances 0.000 claims abstract description 5
- 239000011259 mixed solution Substances 0.000 claims abstract description 4
- 239000000047 product Substances 0.000 claims description 9
- 239000006228 supernatant Substances 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 238000010009 beating Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000004062 sedimentation Methods 0.000 claims description 6
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 12
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 239000011593 sulfur Substances 0.000 abstract description 3
- 229910052717 sulfur Inorganic materials 0.000 abstract description 3
- 235000002639 sodium chloride Nutrition 0.000 description 78
- 229910052500 inorganic mineral Inorganic materials 0.000 description 15
- 235000010755 mineral Nutrition 0.000 description 15
- 239000011707 mineral Substances 0.000 description 15
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 8
- 229910000019 calcium carbonate Inorganic materials 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 7
- 239000000347 magnesium hydroxide Substances 0.000 description 7
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 7
- 229910052602 gypsum Inorganic materials 0.000 description 6
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 239000004566 building material Substances 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 238000001035 drying Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000010440 gypsum Substances 0.000 description 4
- 235000017550 sodium carbonate Nutrition 0.000 description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 description 4
- 239000011780 sodium chloride Substances 0.000 description 4
- 229910052925 anhydrite Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 2
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 229940031958 magnesium carbonate hydroxide Drugs 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 229940061634 magnesium sulfate heptahydrate Drugs 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- -1 retarders Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- 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
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
- C04B11/262—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke waste gypsum other than phosphogypsum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0427—Dry materials
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0445—Synthetic gypsum, e.g. phosphogypsum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ceramic Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biomedical Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for treating salt mud, in particular to a method for treating salt mud containing high calcium sulfate, which comprises the following steps: mixing, namely mixing and pulping the salt slurry and water, and washing in a three-layer sludge washing barrel; the first-stage screening is to screen the mixed solution of the salt slurry and the water through a first-stage screen, particles intercepted by the first-stage screen are first-stage separated matters, and materials passing through the first-stage screen are first-stage undersize matters; performing secondary screening, namely performing secondary screening on the primary undersize passing through the primary screen by using a secondary screen, wherein particles intercepted by the secondary screen are secondary separated matters, and the materials passing through the secondary screen are secondary undersize; settling the fine materials, allowing the secondary undersize to enter a fine material settling tank for settling, and performing filter pressing separation. The method is simple in whole, simple in equipment and low in investment, has great advantages as an environment-friendly item for treating the high-sulfur calcium sulfate sludge, does not generate other wastes in the whole process, and completely utilizes all components, thereby meeting the requirement of environmental protection.
Description
Technical Field
The invention relates to the technical field of waste recycling and environmental protection, in particular to a method for treating salt mud containing high calcium sulfate.
Background
In the salt manufacturing industry of industrial salt or edible salt and the salt industry system of chlor-alkali, soda ash and the like, a large amount of mineral salt is commonly used, the main component of the mineral salt is sodium chloride, but a large amount of salt mud generated along with the mineral salt is not well utilized all the time, and the mineral salt is mainly processed by stacking or salt well backfilling, so that not only is the resource waste caused, but also the land occupation is caused, the underground water source is polluted, and the environmental protection is not favorable.
Because the sea salt or mineral salt components are different from place to place, in salt industry such as industrial salt, edible salt and the like and salt industry such as chlor-alkali, soda ash and the like, because the salt mud components are different from place to place, the post-treatment modes of the salt mud are also different.
Most of the patents of the invention for utilizing the disclosed salt mud are used for preparing calcium sulfate or calcium chloride, and also have the application of the invention as a soil improver, such as the patents for preparing calcium chloride: application numbers 201811102485 and 201610293331; patents for preparing sodium chloride, magnesium carbonate and magnesium hydroxide: as in application No. 201810469853; patents for magnesium sulfate production, such as application No. 201810781781; patent for preparing light calcium carbonate and magnesium sulfate heptahydrate: as in application No. 201811461751; the patent of preparing superfine barium sulfate and superfine calcium carbonate: as in application No. 201910125673; patents for soil improvement fertilizers: such as application number 201910125753. Patents as flue gas treating agents, such as application No. 201611201151; however, since the salt mud is recycled from other industrial wastes, the salt mud can be completely utilized into available resources by a simple method without bringing other wastes, which is the key point of an environmental protection project.
The salt mud in the Taian area is brought by underground mineral salt, the content of calcium sulfate in the mineral is extremely high, the content of calcium sulfate in the existing salt mud patent research is not too high, and calcium carbonate, magnesium hydroxide and the like are mainly extracted and utilized. In the Shandong Taian area, mineral salt is utilized to produce industrial salt, edible salt and chlor-alkali, and local gypsum is rich in minerals, so that the salt mud of the Shandong Taian area contains extremely rich calcium sulfate. However, because of other impurities, the mineral is not well separated and utilized, and the mine is always piled or backfilled to be used as the mined mineral, the value is not utilized to the maximum extent, the pollution of local water sources is caused, and a new environmental protection problem is generated.
The detected components of the Taishan salinized salt mud are as follows: h2O 29.77％；Ca2+ 15.64％；Mg2+ 3.17％；SO4 2-23.74％；Cl- 4.91％；CO3 2- 4.45％。
Converted to compound: h2O 29.77％；NaCl 8.09％；CaSO4·2H2O 41.86％；CaCO37.42％；Ca(OH)25.41％；Mg(OH)2 7.57％。
Through analysis of local salt mud components, particle size states and application status, tests provide some more convenient solutions.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a method for treating salt mud containing high calcium sulfate so as to solve the technical problems at present.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a method for treating salt mud containing high calcium sulfate, which comprises the following steps:
step 1: mixing, namely mixing and pulping the salt slurry and water, and washing the slurry in a third slurry washing tank;
step 2: the first-stage screening, namely screening the washed mixed solution of the salt slurry and the water through a first-stage screen, wherein particles intercepted by the first-stage screen are first-stage separated objects, and materials passing through the first-stage screen are first-stage undersize objects;
step 3: performing secondary screening, namely performing secondary screening on the primary undersize passing through the primary screen by using a secondary screen, wherein particles intercepted by the secondary screen are secondary separated matters, and the materials passing through the secondary screen are secondary undersize;
step 4: settling the fine materials, and allowing the secondary undersize products to enter a fine material settling tank for settling.
Preferably, the first stage screen is located in a first stage water tank, and the first stage screen performs screening by reciprocating or rotating in water.
Preferably, the second stage screen is located in a secondary water trough, and the second stage screen performs screening by reciprocating or rotating in water.
Preferably, in Step1, the mass ratio of the salt mud to the water is 1: 20-1: 30.
preferably, the mixing comprises:
adding the salt slurry into a stirring tank, wherein the weight ratio of the salt slurry to the salt slurry is 1: 20-1: 30, adding washing water, stirring and washing;
and backfilling the settled washing water.
Preferably, in Step1, the mud washing tank is used for washing mud for three times, washing water is used for pulping or backfilling, and the washed salt mud is screened and separated.
Preferably, Step2 further includes:
and (3) primary sedimentation, namely adding the supernatant into a material beating tank after the primary undersize after primary screening separation is settled, and feeding the primary undersize after the supernatant is removed into the upper part of a secondary screen.
Preferably, Step3 further includes:
and (4) secondary sedimentation, namely adding the upper clear liquid into a material beating tank after the secondary undersize separated by secondary screening sedimentation, and crushing the secondary undersize after the upper clear liquid is removed after filter pressing by a filter press.
Preferably, the first-stage separated material is crushed to 1-10um by a ball mill and dehydrated at the temperature of 160-165 ℃ to convert the calcium sulfate dihydrate into the calcium sulfate hemihydrate.
Preferably, Step4 further includes:
and (4) allowing the secondary undersize product to enter a fine material settling tank for settling, and dehydrating the fine slag obtained after the lower-layer settling for 15-30min under-0.8 atmosphere after pressure filtration.
The invention has the beneficial effects that: the invention provides a method for treating salt mud waste residue with high calcium sulfate content, which is generated in the salt industry of mineral salt manufacturing and the salt industry of chlor-alkali, soda ash and the like. The method solves the problem of treatment of the salt slurry generated in the mineral salt manufacturing industry and the salt industry, realizes waste manufacturing by waste, reduces the desulfurization cost of the boiler flue gas, and can fully utilize the salt slurry, so that the salt slurry which is difficult to treat can be used better.
The method is simple in whole, simple in equipment and low in investment, has great advantages as an environment-friendly item for treating the high-sulfur calcium sulfate sludge, does not generate other wastes in the whole process, and completely utilizes all components, thereby meeting the requirement of environmental protection.
Drawings
The foregoing aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block flow diagram of a method for treating high calcium sulfate-containing salt mud according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a filter sieve used in the method for treating high calcium sulfate-containing salt mud according to the embodiment of the invention.
Description of reference numerals:
in fig. 1-2, 1-filter screen; 2-a spring; and 3, a water tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a method for treating salt mud containing high calcium sulfate, which comprises the following steps:
step 1: mixing, namely mixing and pulping the salt slurry and water, and then washing the slurry in three layers of slurry washing barrels;
step 2: the first-stage screening, namely screening the mixed solution of the washed salt slurry and water through a first-stage screen, wherein particles intercepted by the first-stage screen are first-stage separated matters, and materials passing through the first-stage screen are first-stage undersize matters;
step 3: performing secondary screening, namely performing secondary screening on the primary undersize passing through the primary screen by using a secondary screen, wherein particles intercepted by the secondary screen are secondary separated matters, and the materials passing through the secondary screen are secondary undersize;
step 4: settling the fine materials, and allowing the secondary undersize products to enter a fine material settling tank for settling.
Because the salt slurry contains calcium sulfate, calcium carbonate, magnesium hydroxide, calcium hydroxide and other components, the particle size is different, the water content is larger, and the viscosity is higher, the viscosity needs to be reduced firstly in the step of classification separation, and then the step of classification separation is carried out by using screens with different particle sizes. In order to realize the grading separation of the salt mud, a large number of experiments show that the salt mud is relatively easy to screen in water, the viscosity of the salt mud is reduced, and the grading separation of different particles is relatively easy to realize.
And (4) screening in water by adopting a two-stage or three-stage screening device. The screening device can adopt a flat-laying filter screen type for filtration, and can also adopt a drum-type filter screen for filtration and the like.
Firstly, adding a material beating tank into the salt slurry by using a feeding device such as a dragon and the like, adding washing water according to the weight ratio of 1:20-30, stirring and washing, wherein the settled washing water is used for backfilling mine pits and the like due to high salt content. Stirring and pulping the drained slurry, pumping the salt slurry into a three-layer mud washing barrel through a discharge valve at the bottom of a pulping tank, and using the supernatant overflow liquor for pulping or backfilling; the washed salt mud is put on the upper part of a first-stage screen, the screen is placed in a first-stage groove, the first-stage screen does reciprocating motion or rotation ceaselessly in water, large particles are intercepted by the first-stage screen, and the separated particles are used as a first-stage separator and can be directly used as building materials, paving materials and the like; and after the first-stage undersize separated by the first-stage screening is settled, the clear liquid on the upper part is used as mud washing water for a material beating tank, the first-stage undersize separated from the clear liquid by settlement enters the upper part of a second-stage screen, the second-stage screen is arranged in a second-stage water tank, and the precipitate is washed by the washing water. Large particles are intercepted by the second-stage screen mesh through the continuous reciprocating motion or rotation of the second-stage screen mesh in water, the separated particles are used as a second-stage separator, and substances with components and particle sizes meeting requirements can be obtained through the processes of drying, modification, curing and the like and used as building materials with special purposes; and the supernatant liquid after the secondary undersize solution is settled is used as washing water for recycling, and the secondary undersize is crushed to a proper particle size after being filter-pressed by a filter press and is used as a desulfurizer of the coal-fired thermal power plant.
The primary separated material separated by the primary screening is coarse particles and can be directly used as building materials or paving base materials, but because the content of calcium sulfate is very high, the calcium sulfate can also be crushed to 5 mu m by a ball mill and dehydrated at the temperature of 160-165 ℃, so that the calcium sulfate dihydrate is converted into calcium sulfate hemihydrate to be used as building gypsum, and the added value of products is increased.
The primary separated substance separated by the secondary screening can be directly used as the raw material of the building base material after filter pressing, drying, crushing and screening.
Or ball milling and crushing, dehydrating at the temperature of 160-165 ℃ to convert calcium sulfate dihydrate into calcium sulfate hemihydrate, and adding part of adhesives, water-retaining agents, retarders, water absorbents and the like to prepare caulking binders, building putty powder, interior and exterior wall coatings, or wood fillers and other products, thereby increasing the added value of the products.
And (3) allowing the secondary undersize products filtered by the two-stage screen to enter a fine material settling tank, performing filter pressing on the fine slag after the lower-layer settling by using a plate-and-frame filter press, dehydrating under the atmospheric pressure of-0.8 after no water flows, and dehydrating for 15-30min to obtain the dehydrated salt mud with the water content of 10-15%. And (4) directly feeding the salt mud filter cake into a grinding and screening machine, grinding and screening, and returning oversize materials to the system again for grinding. Finally obtaining the desulfurized crushed material particles which contain 10-15% of water and have the particle size of 0.5-0.9 mm. And stirring uniformly to obtain the flue gas desulfurizer for thermoelectrically removing sulfur dioxide acid gas.
As shown in figure 2, the first stage screen and the second stage screen can both adopt a flat-type filter screen 1, the whole filter screen 1 is placed in a water tank 3, and the periphery of the top of the filter screen 1 is fixed on the upper edge of the water tank 3 by a spring 2. The slurry obtained after the supernatant liquid in the upper part is removed by the beating tank flows into the upper part of the filter sieve 1, the slurry is washed by washing water, all the slurry is soaked in water, and the filter sieve 1 is vibrated manually or mechanically, so that all small particles penetrate through a screen mesh of the filter sieve 1. Taking out the first-stage separated matter on the sieve; and the undersize material of the first stage enters the next stage for separation. And (3) using the supernatant after the first-stage undersize is settled as the washing water of the salt slurry entering the pulping tank, enabling the first-stage undersize to enter a second-stage screen with the same configuration, washing with the washing water, and obtaining a second-stage undersize and a second-stage separated matter in the same manner.
And dehydrating the secondary separated substance by using a filter press, drying by using a dryer, crushing, drying at the temperature of 160-165 ℃ to remove part of crystal water so as to convert calcium sulfate dihydrate into calcium sulfate hemihydrate, standing for curing so as to convert the gypsum into the plaster to realize material modification, and adding part of additives according to different requirements to be used as building materials with different purposes.
And (3) settling secondary undersize products after secondary separation, reusing supernatant liquor as washing water, and carrying out press filtration on bottom layer slurry through a plate frame to crush the slurry to 5mm, wherein the bottom layer slurry is used as a semi-dry desulfurizer and is used as a thermoelectric desulfurizer.
When a 200 mesh screen was used, the oversize composition (dry basis) was as follows: CaSO4·1/2H2O 72.19％；CaCO320.43％；Ca(OH)2 3.09％；Mg(OH)24.23% of beta-CaSO4·1/2H2The O is 72.19%, and can be used as building gypsum.
When a 400-mesh sieve is selected, the components (dry basis) on the sieve are as follows: CaSO4·1/2H2O 65.92％；CaCO3：22.85％；Ca(OH)2：6.79％；Mg(OH)2: 4.63 percent. The building material can be used for specific purposes after being treated by adding different additives.
The semi-dry desulfurizing agent (dry basis) obtained after settling treatment of the slurry with the 400-mesh screen in this example was as follows: CaSO4·2H2O 41.51％；CaCO3：22.12％；Ca(OH)2：5.59％；Mg(OH)2: 30.72 percent. Due to Ca (OH)2And Mg (OH)2The content is higher, and the desulfurization is more effective.
The invention provides a method for treating salt mud waste residue with high calcium sulfate content, which is generated in the salt industry of mineral salt manufacturing and the salt industry of chlor-alkali, soda ash and the like. The method solves the problem of treatment of the salt slurry generated in the mineral salt manufacturing industry and the salt industry, realizes waste manufacturing by waste, reduces the desulfurization cost of the boiler flue gas, and can fully utilize the salt slurry, so that the salt slurry which is difficult to treat can be used better.
The method is simple in whole, simple in equipment and low in investment, has great advantages as an environment-friendly item for treating the high-sulfur calcium sulfate sludge, does not generate other wastes in the whole process, and completely utilizes all components, thereby meeting the requirement of environmental protection.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A method for treating salt mud containing high calcium sulfate is characterized by comprising the following steps: the method comprises the following steps:
step 1: mixing, namely mixing and pulping the salt slurry and water, and washing in a three-layer sludge washing barrel;
step 2: the first-stage screening is to screen the mixed solution of the salt slurry and the water through a first-stage screen, particles intercepted by the first-stage screen are first-stage separated matters, and materials passing through the first-stage screen are first-stage undersize matters;
step 3: performing secondary screening, namely performing secondary screening on the primary undersize passing through the primary screen by using a secondary screen, wherein particles intercepted by the secondary screen are secondary separated matters, and the materials passing through the secondary screen are secondary undersize;
step 4: settling the fine materials, allowing the secondary undersize to enter a fine material settling tank for settling, and performing filter pressing separation.
2. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the first-stage screen is positioned in the first-stage water tank and performs screening through reciprocating motion or rotation in water.
3. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the second-stage screen is positioned in the second-stage water tank and performs screening through reciprocating motion or rotation in water.
4. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: in Step1, the mass ratio of the salt mud to the water is 1: 20-1: 30.
5. the method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the mixing comprises the following steps:
adding the salt slurry into a stirring tank, wherein the weight ratio of the salt slurry to the salt slurry is 1: 20-1: 30, adding washing water, stirring and washing;
and backfilling the settled washing water.
6. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the salt mud washing is carried out in a three-layer mud washing barrel, and the washing water is used for pulping or backfilling.
7. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the Step2 further comprises the following steps:
and (3) primary sedimentation, namely adding the supernatant into a material beating tank after the primary undersize after primary screening separation is settled, and feeding the primary undersize after the supernatant is removed into the upper part of a secondary screen.
8. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the Step3 further comprises the following steps:
and (4) secondary sedimentation, namely adding the upper clear liquid into a material beating tank after the secondary undersize separated by secondary screening sedimentation, and crushing the secondary undersize after the upper clear liquid is removed after filter pressing by a filter press.
9. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the first-stage separated material is crushed to 1-10um by a ball mill and dehydrated at the temperature of 160-165 ℃ to convert the calcium sulfate dihydrate into calcium sulfate hemihydrate.
10. The method for treating high-calcium-sulfate-content salty mud according to claim 1, characterized in that: the Step4 further comprises the following steps:
and (4) allowing the secondary undersize product to enter a fine material settling tank for settling, and dehydrating the fine slag obtained after the lower-layer settling for 15-30min at-0.8 atmosphere by using a filter press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011424938.8A CN112456832A (en) | 2020-12-09 | 2020-12-09 | Treatment method of salt mud containing high calcium sulfate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011424938.8A CN112456832A (en) | 2020-12-09 | 2020-12-09 | Treatment method of salt mud containing high calcium sulfate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112456832A true CN112456832A (en) | 2021-03-09 |
Family
ID=74801065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011424938.8A Pending CN112456832A (en) | 2020-12-09 | 2020-12-09 | Treatment method of salt mud containing high calcium sulfate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112456832A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2208058C1 (en) * | 2001-12-17 | 2003-07-10 | Государственное учреждение Институт металлургии Уральского отделения РАН | Method for reprocessing of clayey salt mud of chloride production |
| CN1554588A (en) * | 2003-12-25 | 2004-12-15 | 华东理工大学 | Process for producing super fine barium sulfate and calcium carbonate using chloralkali salt mud |
| CN101219328A (en) * | 2007-10-08 | 2008-07-16 | 史汉祥 | Sulphur dioxide salty mud absorbent |
| CN101274206A (en) * | 2007-12-25 | 2008-10-01 | 江苏省井神盐业有限公司 | Method for producing sulfur absorbing agent by 'salty mud' |
| CN102070175A (en) * | 2010-04-30 | 2011-05-25 | 汪晋强 | Method for producing barium sulfate to co-produce light magnesium carbonate and calcium carbonate by utilizing salt mud of rock salt |
| JP6009118B1 (en) * | 2016-07-29 | 2016-10-19 | 太平洋セメント株式会社 | Treatment method of mud generated by bubble shield method |
| CN106044822A (en) * | 2016-07-29 | 2016-10-26 | 唐山三友化工股份有限公司 | Device and production method for producing light calcium carbonate by using secondary salt slurry |
| CN107363067A (en) * | 2016-05-11 | 2017-11-21 | 江苏井神盐化股份有限公司 | A kind of method that industrial wastes waste residue is stored using Rock-salt Cavity |
| CN108211759A (en) * | 2016-12-22 | 2018-06-29 | 中国石油天然气股份有限公司 | Treatment method and application of salt mud waste generated in chlor-alkali industry |
| CN108862729A (en) * | 2018-07-17 | 2018-11-23 | 莘县华祥盐化有限公司 | A kind of method of chlor-alkali salt sludge sub-prime recycling comprehensive utilization |
-
2020
- 2020-12-09 CN CN202011424938.8A patent/CN112456832A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2208058C1 (en) * | 2001-12-17 | 2003-07-10 | Государственное учреждение Институт металлургии Уральского отделения РАН | Method for reprocessing of clayey salt mud of chloride production |
| CN1554588A (en) * | 2003-12-25 | 2004-12-15 | 华东理工大学 | Process for producing super fine barium sulfate and calcium carbonate using chloralkali salt mud |
| CN101219328A (en) * | 2007-10-08 | 2008-07-16 | 史汉祥 | Sulphur dioxide salty mud absorbent |
| CN101274206A (en) * | 2007-12-25 | 2008-10-01 | 江苏省井神盐业有限公司 | Method for producing sulfur absorbing agent by 'salty mud' |
| CN102070175A (en) * | 2010-04-30 | 2011-05-25 | 汪晋强 | Method for producing barium sulfate to co-produce light magnesium carbonate and calcium carbonate by utilizing salt mud of rock salt |
| CN107363067A (en) * | 2016-05-11 | 2017-11-21 | 江苏井神盐化股份有限公司 | A kind of method that industrial wastes waste residue is stored using Rock-salt Cavity |
| JP6009118B1 (en) * | 2016-07-29 | 2016-10-19 | 太平洋セメント株式会社 | Treatment method of mud generated by bubble shield method |
| CN106044822A (en) * | 2016-07-29 | 2016-10-26 | 唐山三友化工股份有限公司 | Device and production method for producing light calcium carbonate by using secondary salt slurry |
| CN108211759A (en) * | 2016-12-22 | 2018-06-29 | 中国石油天然气股份有限公司 | Treatment method and application of salt mud waste generated in chlor-alkali industry |
| CN108862729A (en) * | 2018-07-17 | 2018-11-23 | 莘县华祥盐化有限公司 | A kind of method of chlor-alkali salt sludge sub-prime recycling comprehensive utilization |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6404948B2 (en) | Method of preparing dechlorinated caustic sludge mixture from caustic sludge by ammonia soda method and its application | |
| RU2407594C1 (en) | Gravity method of removing high-ash slime from coal dressing muddy water circuit | |
| CN101182144A (en) | Cement kiln calcining resource method for domestic waste burning fly ash | |
| CN101391794A (en) | Novel method for preparing light calcium carbonate by recovering solid white slime through alkaline pulping | |
| CN214866045U (en) | Automatic grading treatment application device for high-content calcium sulfate salt mud | |
| CN101284204A (en) | Method for treating flue gas containing SO2 using red mud | |
| CN115418498B (en) | Treatment method of carbonate lithium clay | |
| CN108211759A (en) | Treatment method and application of salt mud waste generated in chlor-alkali industry | |
| CN101759165A (en) | Method for recovering P2O5 in phosphorus ore dressing mill tailings | |
| CN103752261A (en) | Method for preparing uranium adsorbent and curing agent by using raw materials of white mud and oil shale ash | |
| CN108672472A (en) | Sintering semi-dry desulfurization ash treatment method | |
| KR101735096B1 (en) | Sludge solidified agent and preparation method of solidified material using the same | |
| CN103480250B (en) | Method for preparing desulfurizer for thermal power plant by using waste marble powder | |
| CN110498624B (en) | Method for preparing cement iron correction material from iron tailings in full-grain level | |
| CN112371706A (en) | Automatic grading treatment application device for high-content calcium sulfate salt mud | |
| CN112456832A (en) | Treatment method of salt mud containing high calcium sulfate | |
| CN112456619A (en) | Method and device for producing water treatment regulator by using carbide slag | |
| CN102153127B (en) | Method for preparing gypsum by removing sulfate radicals from mineral salts with waste distillation liquid from ammonia alkali factory | |
| CN215742346U (en) | Chlor-alkali salt mud resourceful treatment system | |
| CN114031319A (en) | Method for producing building gypsum powder from phosphogypsum | |
| CN107185384A (en) | The method that dry powder-shaped fume desulfurizing agent is produced using discarded marble | |
| Anawar et al. | The reuse and recycling of coal mining waste with zero-waste approach by technological development and integrated management for sustainable growth and benefits | |
| CN111068535B (en) | Drying recycling method for purified slag of modified asphalt spraying sewage | |
| CN110922225A (en) | Urban garbage combined treatment method and system | |
| KR102037125B1 (en) | Calcium-alkali powder and manufactring method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210309 |
|
| RJ01 | Rejection of invention patent application after publication |