CN117563475A - Sodium carbonate mixed salt recycling treatment device and method - Google Patents
Sodium carbonate mixed salt recycling treatment device and method Download PDFInfo
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- CN117563475A CN117563475A CN202311632501.7A CN202311632501A CN117563475A CN 117563475 A CN117563475 A CN 117563475A CN 202311632501 A CN202311632501 A CN 202311632501A CN 117563475 A CN117563475 A CN 117563475A
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- sodium carbonate
- mixed salt
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- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 title claims abstract description 134
- 150000003839 salts Chemical class 0.000 title claims abstract description 97
- 229910000029 sodium carbonate Inorganic materials 0.000 title claims abstract description 67
- 238000004064 recycling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001704 evaporation Methods 0.000 claims abstract description 56
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims abstract description 48
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 239000012535 impurity Substances 0.000 claims abstract description 31
- 239000011780 sodium chloride Substances 0.000 claims abstract description 24
- 238000002844 melting Methods 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 229940001593 sodium carbonate Drugs 0.000 claims description 60
- 238000000926 separation method Methods 0.000 claims description 40
- 230000008020 evaporation Effects 0.000 claims description 36
- 238000010438 heat treatment Methods 0.000 claims description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000002425 crystallisation Methods 0.000 claims description 30
- 230000008025 crystallization Effects 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 23
- 238000002360 preparation method Methods 0.000 claims description 15
- 239000012266 salt solution Substances 0.000 claims description 14
- 239000000047 product Substances 0.000 claims description 13
- 238000005303 weighing Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 239000002562 thickening agent Substances 0.000 claims description 12
- 238000006386 neutralization reaction Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 10
- XIUMQSREFXCDGE-UHFFFAOYSA-L S(=O)(=O)([O-])O.[Na+].[Cl-].[Na+] Chemical group S(=O)(=O)([O-])O.[Na+].[Cl-].[Na+] XIUMQSREFXCDGE-UHFFFAOYSA-L 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 9
- 239000000428 dust Substances 0.000 claims description 9
- 239000005413 snowmelt Substances 0.000 claims description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 8
- 238000005119 centrifugation Methods 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 8
- 239000012452 mother liquor Substances 0.000 claims description 8
- 229910001385 heavy metal Inorganic materials 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 238000012216 screening Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 6
- 239000012267 brine Substances 0.000 claims description 5
- MQRJBSHKWOFOGF-UHFFFAOYSA-L disodium;carbonate;hydrate Chemical compound O.[Na+].[Na+].[O-]C([O-])=O MQRJBSHKWOFOGF-UHFFFAOYSA-L 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 229940076133 sodium carbonate monohydrate Drugs 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 238000001354 calcination Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000007800 oxidant agent Substances 0.000 claims description 3
- 230000001376 precipitating effect Effects 0.000 claims description 3
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 3
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 3
- 230000001112 coagulating effect Effects 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 8
- 230000008018 melting Effects 0.000 abstract description 4
- 239000002920 hazardous waste Substances 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 description 10
- 238000004090 dissolution Methods 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000007781 pre-processing Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 150000003254 radicals Chemical class 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- GKLVJDKEMZBILE-UHFFFAOYSA-N [Nb].[Mo].[Cr] Chemical group [Nb].[Mo].[Cr] GKLVJDKEMZBILE-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000008396 flotation agent Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000000935 solvent evaporation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- -1 sulfate radical Chemical class 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- ZNRSXPDDVNZGEN-UHFFFAOYSA-K trisodium;chloride;sulfate Chemical compound [Na+].[Na+].[Na+].[Cl-].[O-]S([O-])(=O)=O ZNRSXPDDVNZGEN-UHFFFAOYSA-K 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/22—Purification
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- 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
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
-
- 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
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
-
- 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
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/83—Mixing plants specially adapted for mixing in combination with disintegrating operations
- B01F33/831—Devices with consecutive working receptacles, e.g. with two intermeshing tools in one of the receptacles
-
- 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
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
-
- 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
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/836—Mixing plants; Combinations of mixers combining mixing with other treatments
- B01F33/8364—Mixing plants; Combinations of mixers combining mixing with other treatments with drying
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D7/00—Carbonates of sodium, potassium or alkali metals in general
- C01D7/22—Purification
- C01D7/24—Crystallisation
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a sodium carbonate mixed salt recycling treatment device which comprises a pretreatment unit (1), a dissolving and impurity removing filtering unit (2), a sodium carbonate evaporating and crystallizing unit (3), a drying unit (5), a sodium chloride evaporating and centrifuging unit (6) and a snow melting agent preparing unit (7), wherein the pretreatment unit (1), the dissolving and impurity removing filtering unit (2) and the sodium carbonate evaporating and crystallizing unit (3) are sequentially connected, one end of the sodium carbonate evaporating and crystallizing unit (3) is connected with the drying unit (5), the other end of the sodium carbonate evaporating and crystallizing unit is connected with the sodium chloride evaporating and centrifuging unit (6), and the sodium chloride evaporating and centrifuging unit (6) is connected with the snow melting agent preparing unit (7). The method has the advantages that the sodium carbonate in the mixed salt is purified and recycled, the resource utilization is realized, and meanwhile, the whole process has no generation of other secondary hazardous wastes, and is environment-friendly and efficient.
Description
Technical Field
The invention relates to the technical field of hazardous waste salt recycling, in particular to a sodium carbonate mixed salt recycling treatment device and method.
Background
The mixed salt can be produced by the advanced treatment of water or the treatment of a waste alkali liquid device in the industrial, petrochemical and natural gas chemical production process, and has the characteristics of various organic matters, complex components, numerous sources, high treatment cost, great environmental hazard and the like, so that the mixed salt has great hazard, can not be directly used or stored for a long time, and therefore, the mixed salt produced by the chemical industry has great hazard to the environment and needs to be recycled and harmless.
Meanwhile, industrial waste salt is also an important chemical raw material, if the industrial waste salt can be recycled as industrial raw material salt, not only can the pollution of the industrial raw material salt to the environment be eliminated, but also salt resources can be fully utilized, and the recycling and cyclic utilization of the byproduct salt can be realized.
At present, part of units and universities have begun to research on the recycling of mixed salt, for example, chinese patent CN109865599A discloses a method for recycling chemical mixed salt, and chemical mixed salt is directly used as a flotation agent, but has narrow range requirements on mixed salt components. The recycling method of the industrial mixed salt disclosed in CN109911918A aims at the industrial mixed salt containing an organic solvent, and solvent extraction and evaporation washing are used, but the pertinence is strong, and the treated object is specific. The method disclosed in CN106745076A is a method for recycling mixed salt produced by industrial wastewater treatment, which firstly adopts calcination, cooling and pure water dissolution, and then removes sulfate radical to obtain high-purity sodium chloride, however, the method has higher cost, and is necessary for recycling mixed salt with low cost and general applicability and harmless disposal methods in the face of increasingly higher market of mixed salt production and policy requirements of increasingly higher environmental protection pressure.
Most of the sodium chloride mixed salt is aimed at present, but less sodium carbonate mixed salt is aimed at, and sodium carbonate is used as an indispensable raw material in industrial production, so that research on a resource utilization treatment method of the sodium carbonate is necessary.
Disclosure of Invention
The invention aims to solve the problems of high harm, high treatment cost and low recycling utilization rate of the existing mixed salt, and provides a sodium carbonate mixed salt recycling treatment device which can purify and recycle sodium carbonate in mixed salt to realize recycling utilization, and meanwhile, the whole process has no generation of other secondary hazardous waste, and is environment-friendly and efficient.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a sodium carbonate mixed salt resource treatment device, includes the preprocessing unit, dissolve edulcoration filter unit, sodium carbonate evaporation crystallization unit, drying unit, sodium chloride evaporation centrifugation unit and snow melt agent preparation unit of mutually supporting, wherein, preprocessing unit, dissolve edulcoration filter unit and sodium carbonate evaporation crystallization unit link to each other in proper order, and drying unit is connected to sodium carbonate evaporation crystallization unit's one end, sodium chloride evaporation centrifugation unit is connected to the other end, and sodium chloride evaporation centrifugation unit links to each other with snow melt agent preparation unit again.
Further, the pretreatment unit comprises a bag breaker, a lifter and a first crusher which are sequentially connected, one end of the first crusher is connected with the lifter, and the other end of the first crusher is connected with the dissolution impurity removal filter unit through a continuous feeder.
Further, the dissolving and impurity-removing filter unit comprises a dissolving tank, an impurity-removing tank and a filter which are sequentially connected, one end of the dissolving tank is connected with the continuous feeder, the other end of the dissolving tank is connected with the inlet of the impurity-removing tank, the liquid outlet of the impurity-removing tank is connected with the filter, and the mud outlet of the impurity-removing tank is connected with the dehydration unit.
Further, the specific gravity of the mixed salt and water in the dissolving tank of the dissolving and impurity removing filter unit is 1:4.
further, the precipitating agent in the impurity removing tank of the dissolving impurity removing and filtering unit is sodium sulfide, and the oxidizing agent is hydrogen peroxide or ozone.
Further, the sodium carbonate evaporation crystallization unit sequentially comprises a preheater, an effective heating chamber, an effective axial flow pump, an effective separation chamber, a two-effect heating chamber, a two-effect circulating pump, a two-effect separation chamber, a three-effect heating chamber, a three-effect circulating pump, a three-effect separation chamber and a condenser, wherein the preheater is connected with the effective heating chamber and internally circulates under the effective axial flow pump, the steam outlet of the one-effect separation chamber is connected with the shell side inlet of the two-effect heating chamber, the liquid outlet of the one-effect separation chamber is connected with the tube side inlet of the two-effect heating chamber through an effective discharging pump and internally circulates under the two-effect circulating pump, the steam outlet of the two-effect separation chamber is connected with the tube side inlet of the three-effect heating chamber through the two-effect discharging pump and internally circulates under the three-effect circulating pump, the steam outlet of the three-effect separation chamber is connected with the condenser, and the condenser is connected with the neutralization reaction tank through a pipeline.
Further, the drying unit comprises a second crusher, a vibration feeder, a hot blast stove, a fluidized bed and a storage tank which are sequentially connected, wherein one end of the second crusher is connected with the sodium carbonate evaporative crystallization unit, and the other end of the second crusher is connected with the vibration feeder.
Further, the sodium chloride evaporation centrifugal unit comprises a triple-effect evaporator, a thickener and a centrifugal machine, wherein the outlet of the neutralization reaction tank is connected with the triple-effect evaporator, the liquid outlet of the triple-effect evaporator is connected with the thickener through a triple-effect discharge pump, the thickener is connected with the centrifugal machine again, the centrifugal salt is sodium sulfate-sodium chloride wet salt, and the salt outlet of the centrifugal machine is connected with the snow-melting agent preparation unit.
Further, the snow melt agent preparation unit comprises a weighing batching and mixing device, an extrusion screening device, a finished product packaging and dust removing device, wherein the weighing batching and mixing device, the extrusion screening device and the finished product packaging and dust removing device are sequentially connected, the weighing device of the weighing batching and mixing device adopts a three-element metering scale, and the grain size of the snow melt agent grains after extrusion granulation is 3-6 mm.
In order to further accomplish the purpose of the present invention, a method for recycling sodium carbonate mixed salt is provided, and the device for recycling sodium carbonate mixed salt is used, comprising the following specific steps:
(1) Pretreatment: carrying out bag breaking, lifting and crushing treatment on the sodium carbonate mixed salt, conveying the treated mixed salt to a storage bin and conveying the mixed salt to a dissolving and impurity-removing filtering unit through a continuous feeder;
(2) Dissolving, removing impurities, oxidizing and filtering: the mixed salt is sent to a dissolving tank for dissolution to obtain mixed salt solution, the mixed salt solution is then sent to a impurity removal tank for heavy metal precipitation and oxidation treatment in sequence, brine after the oxidation treatment is added with a coagulating flocculant for reaction, and then is separated by a filter, and the filtered salt solution is pumped into a brine buffer tank and is sent to a sodium carbonate evaporation crystallization unit;
(3) Primary evaporation crystallization: the filtrate after dissolving the impurity removal filter unit is indirectly preheated by the preheater and then enters the heating chamber, the effective internal circulation is realized under the action of the axial flow pump, the gas-liquid separation is realized in the separation chamber, the secondary steam is condensed by the condenser, part of condensed water is recycled into the dissolving tank, and the non-condensed water is pumped by the vacuum pump;
(4) And (3) drying: crushing the sodium carbonate monohydrate treated by the sodium carbonate evaporative crystallization unit by a crusher, then conveying the crushed sodium carbonate monohydrate into a fluidized bed by a vibration feeder, sequentially calcining at high temperature to remove crystal water and free water under the condition that a hot blast stove provides a heat source, and conveying the overflow discharge of the dried material after removing the crystal water into a storage tank to obtain sodium carbonate crystal salt;
(5) And (3) secondary evaporation crystallization: the primary mother liquor treated by the sodium carbonate evaporative crystallization unit enters a neutralization reaction tank, hydrochloric acid is added for neutralization treatment, the primary mother liquor enters a sodium chloride evaporative centrifugal unit for secondary evaporative crystallization, concentrated solution is pumped to a thickener through a three-effect discharge pump, and then is centrifugally separated through a centrifugal machine, centrifugal salt is sodium sulfate-sodium chloride wet salt and is sent to a snow-melting agent preparation system, the secondary mother liquor returns to the three-effect evaporator for internal circulation evaporation, and crystallized condensed water is collected into a condensed water tank;
(6) Preparing a snow melting agent: and (3) proportioning, crushing and mixing, extruding and granulating, screening and packaging sodium sulfate-sodium chloride wet salt of the sodium chloride evaporation and centrifugation unit to finally obtain the snow-melting agent product.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The invention is provided with the pretreatment and dissolution impurity removal filtering unit, can dissolve waste salt by utilizing condensed water generated by the evaporation crystallization unit, realizes zero discharge of waste water, and can greatly reduce the water consumption of the whole system; meanwhile, the heavy metal in the mixed salt solution can be precipitated by the dissolving and impurity removing filtering unit, and the COD content in the mixed salt solution can be effectively reduced by adding hydrogen peroxide, so that the purity of the solution entering the evaporation crystallization unit is improved;
(2) According to the invention, the evaporation crystallization unit is adopted, so that the mixed salt solution can be further evaporated and purified, and the liquid after evaporation treatment can be subjected to solid-liquid separation through the centrifugal separation unit, so that the purpose of purifying and recycling sodium carbonate in the mixed salt is achieved;
(3) According to the invention, the material of the vibrating fluidized bed uniformly and continuously falls onto the distributing plate of the vibrating fluidized bed through the feeder, the material bed forms a uniform fluidization state under the dual actions of vibration force and hot air flow, the vibration is helpful for dispersing the material, the phenomena of agglomeration, channeling and the like are avoided, in addition, the retention time of the material in the machine is changed by adjusting the vibration parameter, and uniform qualified dry products are easy to obtain;
(4) The invention is provided with the snow-melting agent preparation unit, sodium chloride-sodium sulfate mixed salt after evaporation and centrifugation can be used for preparing a snow-melting agent product meeting the standard by the system, so that the situation that the waste salt is completely eaten and squeezed is truly realized, the whole mixed salt solution is finally and completely converted into a product, the resource utilization is realized, and the rest secondary dangerous waste is not generated in the whole process.
Drawings
FIG. 1 is a schematic diagram of a connection of a sodium carbonate mixed salt recycling treatment device of the invention;
FIG. 2 is a flow chart of a method for recycling sodium carbonate mixed salt according to the invention;
FIG. 3 is a schematic flow chart of a snow-melting agent preparation unit of the present invention.
Detailed Description
Examples
In order that the invention may be more clearly understood, a device and method for recycling sodium carbonate mixed salt according to the invention will be further described with reference to the accompanying drawings, wherein the specific embodiments are provided for illustrating the invention only and are not intended to limit the invention.
Referring to fig. 1, a sodium carbonate mixed salt recycling treatment device is characterized in that:
the device comprises a pretreatment unit 1, a dissolving and impurity removing filter unit 2, a sodium carbonate evaporating and crystallizing unit 3, a drying unit 5, a sodium chloride evaporating and centrifuging unit 6 and a snow-melting agent preparing unit 7 which are matched with each other, wherein the pretreatment unit 1, the dissolving and impurity removing filter unit 2 and the sodium carbonate evaporating and crystallizing unit 3 are sequentially connected, one end of the sodium carbonate evaporating and crystallizing unit 3 is connected with the drying unit 5, the other end of the sodium carbonate evaporating and crystallizing unit 3 is connected with the sodium chloride evaporating and centrifuging unit 6, and the sodium chloride evaporating and centrifuging unit 6 is connected with the snow-melting agent preparing unit 7;
the pretreatment unit 1 comprises a bag breaker 11, a lifter 12 and a first crusher 13 which are sequentially connected, wherein one end of the first crusher 13 is connected with the lifter 12, and the other end of the first crusher is connected with the dissolving and impurity-removing filter unit 2 through a continuous feeder 8;
the dissolving and impurity removing filter unit 2 comprises a dissolving tank 21, an impurity removing tank 22 and a filter 23 which are sequentially connected, wherein one end of the dissolving tank 21 is connected with the continuous feeder 8, the other end of the dissolving tank is connected with an inlet of the impurity removing tank 22, a liquid outlet of the impurity removing tank 22 is connected with the filter 23, and a mud outlet of the impurity removing tank 22 is connected with the dewatering unit 4;
the specific gravity of the mixed salt and water in the dissolution tank 21 is 1:4, the precipitating agent in the impurity removal tank 22 is sodium sulfide, and the oxidizing agent is hydrogen peroxide or ozone;
the sodium carbonate evaporative crystallization unit 3 sequentially comprises a preheater 31, an effective heating chamber 32a, an effective axial flow pump 33a, an effective separation chamber 34a, a second effective heating chamber 32b, a second effective circulating pump 33b, a second effective separation chamber 34b, a third effective heating chamber 32c, a third effective circulating pump 33c, a third effective separation chamber 34c and a condenser 35, wherein the preheater 31 is connected with the first effective heating chamber 32a and internally circulates under the first effective axial flow pump 33a, the steam outlet of the first effective separation chamber 34a is connected with the shell side inlet of the second effective heating chamber 32b, the liquid outlet of the first effective separation chamber is connected with the tube side inlet of the second effective heating chamber 32b through a first effective discharging pump and internally circulates under the second effective circulating pump 33b, the steam outlet of the second effective separation chamber 34b is connected with the shell side inlet of the third effective heating chamber 32c, and the liquid outlet of the third effective separation chamber 34c is connected with the condenser 35 under the third effective circulating pump 33 c;
the drying unit 5 comprises a second crusher 51, a vibration feeder 52, a hot blast stove 53, a fluidized bed 54 and a storage tank 55 which are sequentially connected, wherein one end of the second crusher 51 is connected with the sodium carbonate evaporative crystallization unit 3, and the other end of the second crusher is connected with the vibration feeder 52;
the sodium chloride evaporation and centrifugation unit 6 comprises a triple-effect evaporator 61, a thickener 62 and a centrifuge 63, the sodium carbonate evaporation and crystallization unit 3 is connected with the triple-effect evaporator 61 through a neutralization reaction tank 9, a liquid outlet of the triple-effect evaporator 61 is connected with the thickener 62 through a triple-effect discharge pump 61a, the thickener 62 is connected with the centrifuge 63 again, the centrifugal salt is sodium sulfate-sodium chloride wet salt, and a salt outlet of the centrifuge 63 is connected with the snow-melting agent preparation unit 7;
the snow melt agent preparation unit 7 comprises a weighing batching and mixing device 71, an extrusion screening device 72, a finished product package 73 and a dust removing device 74 which are sequentially connected, wherein the weighing device of the weighing batching and mixing device 71 adopts a three-element metering scale, and the grain size of the snow melt agent grains after extrusion granulation is 3-6 mm.
Taking typical sodium carbonate mixed salt after compatibility as an example, the components are as follows:
referring to fig. 2, the process flow for treating sodium carbonate mixed salt using the method of the present invention is as follows:
(1) The manual operation electric reed is used for placing the waste salt ton bag at the unsealing position of the ton bag unpacking machine, the ton bag passes through the unsealing system, waste materials slide into the waste salt buffer bin through gravity, and meanwhile, the bag dust remover is matched, so that dust leakage in the unloading process is prevented.
(2) Dissolving impurity-removing filter unit
1) Dissolving: the waste salt is delivered to the dissolving tank 21 through a waste salt buffer bin feeder, and fresh water and reuse water are simultaneously introduced into the dissolving tank 21, wherein the reuse water is condensate evaporated by a three-effect evaporator and steam condensate water, and the waste salt is dissolved under the continuous stirring of a stirrer. About 2.1 tons of mixed salt per hour was dissolved in 7.9 tons of water to produce a 21% 10 tons/hour mixed salt solution.
2) Removing impurities: a precipitant is added to the impurity removal tank 22 to precipitate heavy metals. Firstly, detecting the content of heavy metal ions in raw materials, then predicting the content of the heavy metal ions in a finished product, converting the amount of the heavy metal ions to be removed, and adding corresponding Na into saturated brine 2 S, forming sulfide insoluble matters with the S. The partial reaction equations involved are as follows:
Na 2 S+Hg 2+ =2Na++HgS；
Na 2 S+Ni 2+ =2Na++NiS。
3) Oxidizing: to ensure that the TOC in the salt product meets the standards, H is added to the impurity removal tank 22 after impurity removal 2 O 2 Effectively reduces the COD content in the salt solution, and controls the reaction time to be more than 30 minutes. The action mechanism is as follows:
HO 2 •+H 2 O 2 =O 2 +H 2 O+•OH；
RH+•OH=R•+H 2 O；
R•+O 2 =ROO+==CO 2 +H 2 O；
H 2 O 2 generating OH free radical with strong oxidizing ability, reacting OH with organic RH to generate organic free radical R, further oxidizing to generate carbon chain fission of organic structure, oxidizing to CO 2 And H 2 O, thereby greatly reducing COD.
4) And (3) filtering: adding a coagulating agent into the brine subjected to oxidation treatment for reaction, separating by a filter 23, and collecting waste gas in a concentrated manner and then entering a waste gas treatment system; pumping the filtered filter residues to a plate-and-frame filter press for filter pressing; pumping the filtered salt solution into a salt water buffer tank, and pumping the salt solution into a sodium carbonate evaporation unit and a centrifuge for evaporation crystallization treatment; and returning the filter liquor after filter pressing to the salt dissolving unit.
(3) Sodium carbonate evaporative crystallization unit
The filtrate after pretreatment unit is preheated indirectly by preheater 31 and fed into first-effect heating chamber 32a, with raw steam as heat source of first-effect heating chamber, effective internal circulation is realized under the action of first-effect axial flow pump 33a, gas-liquid separation is realized in first-effect separation chamber 34a, secondary steam enters into second-effect heating chamber 32b shell side, concentrated solution is pumped to second-effect heating chamber 32b by primary discharging pump, effective internal circulation is realized under the action of second-effect circulation pump 33b, gas-liquid separation is realized in second-effect separation chamber 34b, secondary steam enters into third-effect heating chamber 32c shell side as heat source, concentrated solution is pumped to third-effect heating chamber 32c by secondary discharging pump, effective internal circulation is realized under the action of third-effect circulation pump 33c, gas-liquid separation is realized in third-effect separation chamber 34c, secondary steam is condensed by indirect condenser 35 and is not pumped away by vacuum pump.
And (3) drying: the sodium carbonate monohydrate filtered by the centrifugal machine of the primary evaporation crystallization system is conveyed to a fluidized bed device area through a spiral feeder, materials from the spiral feeder are crushed through a second crusher 51, then are conveyed into a fluidized bed 54 through a vibration feeder 52, the fluidized bed 54 is divided into two areas, free water is removed in the first section, and crystal water is removed in the second section through high-temperature calcination. And (5) discharging the overflowed dried material after removing the crystal water into a finished product bin. The hot blast stove 53 provides a heat source, the heat source is natural gas, the 300 ℃ hot air subjected to indirect heat exchange is firstly sent to the second section for drying, the tail gas with the temperature reduced by 160 ℃ after drying is sent to the first section for removing free water, and the tail gas is discharged after dust removal by a cyclone dust remover and a pulse bag dust remover.
(3) The primary mother solution enters a neutralization reaction tank 9, hydrochloric acid is added for neutralization treatment, and then secondary evaporation crystallization is carried out to obtain a salt mixing unit.
(4) Sodium chloride evaporation centrifugal unit
The mother liquor after neutralization treatment enters a secondary evaporation crystallization system, firstly, a primary heating chamber is arranged after passing through a raw steam condensate preheater, raw steam is used as a heat source of the primary heating chamber, the internal circulation is realized under the action of a primary axial flow pump, gas-liquid separation is realized in a primary separation chamber, secondary steam enters a secondary heating chamber shell pass, the concentrated liquor is pumped to a secondary heating chamber through a primary discharging pump, the internal circulation is realized under the action of a secondary circulating pump, the gas-liquid separation is realized in a secondary separation chamber, the secondary steam enters a three-effect heating chamber shell pass to serve as a heat source, the concentrated liquor is pumped to a three-effect heating chamber through a secondary discharging pump, the internal circulation is realized under the action of a three-effect circulating pump, the gas-liquid separation is realized in a three-effect separation chamber, the secondary steam is condensed through an indirect condenser, the non-condensed steam is pumped away through a vacuum pump, the concentrated liquor is sent to a thickener 62, and then centrifugally separated through a centrifuge 63, and centrifugal salt is sodium sulfate-sodium chloride wet salt, and sent to a snow-thawing agent preparation unit 7; the mother liquor is returned to the triple effect evaporator 61 for circular evaporation, and the crystallized condensed water is collected into a condensed water tank.
(5) Snow melt agent preparation unit
Referring to fig. 3, the sodium sulfate-sodium chloride wet salt of the sodium chloride evaporation and centrifugation unit 6 enters the snow-melting agent preparation unit 7, and is prepared according to the following process flow:
1) Dynamic batching: the dynamic continuous weighing and batching system is provided with an automatic computer controlled counting and weighing. The three-element metering scale can adjust the ton weighing proportion of sodium chloride and calcium chloride, and the electric control adopts touch screen operation, so that a plurality of weight formulas can be set.
2) Crushing: crushing the material after the ingredients by using a crusher, wherein the crusher adopts a high-speed blade crushing structure, and the humidity requirement of the crushed material is less than or equal to 40%.
3) Extruding and granulating: extrusion granulation is carried out through a snow melting agent granulation machine, the particle diameter is 3-6 mm, the machine frame structure is Q235 according to die adjustment, the core material roller is chromium molybdenum niobium alloy, and the separator is made of stainless steel.
4) Screening and packaging: after the extruded and granulated materials are screened, the materials are packaged and sold through a packaging bag with the packaging specification of 20 kg-50 kg.
The sodium carbonate mixed salt recycling treatment system has the advantages of short process route, low energy consumption, high purity of separated and purified sodium carbonate product salt, complete production of the whole system, no generation of other mixed salt, real realization of full utilization of resources, high efficiency and environmental protection.
Other embodiments of the invention are also possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (10)
1. The utility model provides a sodium carbonate mixed salt resourceful treatment device which characterized in that:
the device comprises a pretreatment unit (1), a dissolving and impurity removing filter unit (2), a sodium carbonate evaporating and crystallizing unit (3), a drying unit (5), a sodium chloride evaporating and centrifuging unit (6) and a snow-melting agent preparing unit (7), wherein the pretreatment unit (1), the dissolving and impurity removing filter unit (2) and the sodium carbonate evaporating and crystallizing unit (3) are sequentially connected, one end of the sodium carbonate evaporating and crystallizing unit (3) is connected with the drying unit (5), the other end of the sodium carbonate evaporating and crystallizing unit is connected with the sodium chloride evaporating and centrifuging unit (6), and the sodium chloride evaporating and centrifuging unit (6) is connected with the snow-melting agent preparing unit (7).
2. The sodium carbonate mixed salt recycling treatment device according to claim 1, characterized in that:
the pretreatment unit (1) comprises a bag breaker (11), a lifter (12) and a first crusher (13) which are sequentially connected, one end of the first crusher (13) is connected with the lifter (12), and the other end of the first crusher is connected with the dissolving impurity-removing filter unit (2) through the continuous feeder (8).
3. The sodium carbonate mixed salt recycling treatment device according to claim 2, characterized in that:
the dissolving and impurity-removing filter unit (2) comprises a dissolving tank (21), an impurity-removing tank (22) and a filter (23) which are sequentially connected, one end of the dissolving tank (21) is connected with the continuous feeder (8), the other end of the dissolving tank is connected with the inlet of the impurity-removing tank (22), the liquid outlet of the impurity-removing tank (22) is connected with the filter (23), and the mud outlet of the impurity-removing tank (22) is connected with the dewatering unit (4).
4. The sodium carbonate mixed salt recycling treatment device according to claim 3, characterized in that:
the specific gravity of the mixed salt and water in the dissolving tank (21) of the dissolving and impurity removing filter unit (2) is 1:4.
5. the sodium carbonate mixed salt recycling treatment device according to claim 4, wherein:
the precipitating agent in the impurity removing tank (22) of the dissolving impurity removing filter unit (2) is sodium sulfide, and the oxidizing agent is hydrogen peroxide or ozone.
6. The sodium carbonate mixed salt recycling treatment device according to claim 5, characterized in that:
the sodium carbonate evaporation crystallization unit (3) sequentially comprises a preheater (31), an effective heating chamber (32 a), an effective axial flow pump (33 a), an effective separation chamber (34 a), a second effective heating chamber (32 b), a second effective circulating pump (33 b), a second effective separation chamber (34 b), a third effective heating chamber (32 c), a third effective circulating pump (33 c), a third effective separation chamber (34 c) and a condenser (35), wherein the preheater (35) is connected with the first effective heating chamber (32 a) and performs internal circulation under the effective axial flow pump (33 a), the steam outlet of the first effective separation chamber (34 a) is connected with the shell side inlet of the second effective heating chamber (32 b), the liquid outlet of the first effective separation chamber is connected with the tube side inlet of the second effective heating chamber (32 b) through an effective discharge pump, and performs internal circulation under the second effective circulating pump (33 b), the steam outlet of the second effective separation chamber (34 b) is connected with the shell side inlet of the third effective heating chamber (32 c), the liquid outlet of the second effective separation chamber is connected with the third effective heating chamber (32 c) through the second effective discharge pump, and the liquid outlet of the third effective separation chamber (32 c) is connected with the condenser (35) through the third effective circulating pump (33 c).
7. The sodium carbonate mixed salt recycling treatment device according to claim 6, characterized in that:
the drying unit (5) comprises a second crusher (51), a vibration feeder (52), a hot blast stove (53), a fluidized bed (54) and a storage tank (55) which are sequentially connected, wherein one end of the second crusher (51) is connected with the sodium carbonate evaporative crystallization unit (3), and the other end of the second crusher is connected with the vibration feeder (52).
8. The sodium carbonate mixed salt recycling treatment device according to claim 7, characterized in that:
the sodium chloride evaporation centrifugal unit (6) comprises a triple-effect evaporator (61), a thickener (62) and a centrifugal machine (63), wherein the outlet of the neutralization reaction tank (9) is connected with the triple-effect evaporator (61), the liquid outlet of the triple-effect evaporator (61) is connected with the thickener (62) through a triple-effect discharging pump (61 a), the thickener (62) is connected with the centrifugal machine (63) again, the centrifugal salt is sodium sulfate-sodium chloride wet salt, and the salt outlet of the centrifugal machine (63) is connected with the snow-melting agent preparation unit (7).
9. The sodium carbonate mixed salt recycling treatment device according to claim 8, characterized in that:
the snow melt agent preparation unit (7) comprises a weighing batching and mixing device (71), an extrusion screening device (72), a finished product package (73) and a dust removing device (74) which are sequentially connected, wherein the weighing device of the weighing batching and mixing device (71) adopts a three-element metering scale, and the grain diameter of the snow melt agent grains after extrusion granulation is 3-6 mm.
10. The sodium carbonate mixed salt recycling treatment method comprises the following specific steps of the sodium carbonate mixed salt recycling treatment device according to claim 9, and is characterized in that:
step one, pretreatment: carrying out bag breaking, lifting and crushing treatment on the sodium carbonate mixed salt, conveying the treated mixed salt to a storage bin and conveying the mixed salt to a dissolving and impurity-removing filtering unit (2) through a continuous feeder (8);
step two, dissolving, removing impurities, oxidizing and filtering: the mixed salt is sent to a dissolving tank (21) for dissolving to obtain mixed salt solution, the mixed salt solution enters a impurity removal tank (22) for heavy metal precipitation and oxidation treatment in sequence, brine after the oxidation treatment is added with a coagulating flocculant for reaction, and then is separated by a filter (23), and the filtered salt solution is pumped into a brine buffer tank and is sent to a sodium carbonate evaporation crystallization unit (3);
step three, primary evaporation crystallization: the filtrate after dissolving the impurity removal filter unit (2) is indirectly preheated by a preheater (31) and then enters a heating chamber (32), the effective internal circulation is realized under the action of an axial flow pump (33), the gas-liquid separation is realized in a separation chamber (34), the secondary steam is condensed by a condenser (35), part of condensed water is recycled into a dissolving tank (21), and no condensed water is pumped by a vacuum pump;
step four, drying: crushing sodium carbonate monohydrate treated by a sodium carbonate evaporation crystallization unit (3) by a crusher (51), then conveying the crushed sodium carbonate monohydrate into a fluidized bed (54) by a vibration feeder (52), sequentially calcining at a high temperature to remove crystal water and free water under the condition that a hot blast stove (53) provides a heat source, and conveying the overflow discharge of a dried material after removing the crystal water into a storage tank (55) to obtain sodium carbonate crystal salt;
step five, secondary evaporation crystallization: the primary mother liquor treated by the sodium carbonate evaporative crystallization unit (3) enters a neutralization reaction tank (9), hydrochloric acid is added for neutralization treatment, the primary mother liquor enters a sodium chloride evaporative centrifugal unit (6) for secondary evaporative crystallization, concentrated liquor is sent to a thickener (62) through a three-effect discharge pump (61), and is centrifugally separated through a centrifuge (63), centrifugal salt is sodium sulfate-sodium chloride wet salt and is sent to a snow-melting agent preparation system, the secondary mother liquor is circularly evaporated in the three-effect evaporator (61), and crystallized condensed water is collected into a condensed water tank;
step six, preparing a snow-melting agent: and (3) proportioning, crushing and mixing, extruding and granulating, screening and packaging sodium sulfate-sodium chloride wet salt of the sodium chloride evaporation and centrifugation unit (6) to finally obtain the snow-melting agent product.
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