CN110711764A - Solid waste salt recycling process technology - Google Patents
Solid waste salt recycling process technology Download PDFInfo
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- CN110711764A CN110711764A CN201911037317.1A CN201911037317A CN110711764A CN 110711764 A CN110711764 A CN 110711764A CN 201911037317 A CN201911037317 A CN 201911037317A CN 110711764 A CN110711764 A CN 110711764A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 26
- 238000005516 engineering process Methods 0.000 title claims abstract description 16
- 238000004064 recycling Methods 0.000 title claims abstract description 16
- 239000002910 solid waste Substances 0.000 title claims abstract description 15
- 239000002699 waste material Substances 0.000 claims abstract description 82
- 239000007788 liquid Substances 0.000 claims abstract description 29
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003546 flue gas Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 239000013078 crystal Substances 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 12
- 238000006864 oxidative decomposition reaction Methods 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000012216 screening Methods 0.000 claims abstract description 8
- 238000011282 treatment Methods 0.000 claims abstract description 8
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 7
- 238000005979 thermal decomposition reaction Methods 0.000 claims abstract description 6
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 4
- 238000001953 recrystallisation Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 239000002920 hazardous waste Substances 0.000 claims description 8
- 239000012266 salt solution Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052731 fluorine Inorganic materials 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 239000012065 filter cake Substances 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 230000008719 thickening Effects 0.000 claims description 4
- 239000002562 thickening agent Substances 0.000 claims description 4
- 238000004056 waste incineration Methods 0.000 claims description 4
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical group O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 claims description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- 229910052801 chlorine Inorganic materials 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 239000010805 inorganic waste Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 238000010907 mechanical stirring Methods 0.000 claims description 3
- 239000003345 natural gas Substances 0.000 claims description 3
- 230000005501 phase interface Effects 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 2
- 239000010815 organic waste Substances 0.000 abstract description 2
- 230000008929 regeneration Effects 0.000 abstract description 2
- 238000011069 regeneration method Methods 0.000 abstract description 2
- 238000002425 crystallisation Methods 0.000 abstract 1
- 230000008025 crystallization Effects 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 239000010881 fly ash Substances 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A solid waste salt recycling process technology is characterized in that: the method comprises the following steps: screening waste salt, matching, ex-warehouse, crushing and dissolving, solid-liquid separation, crystallization separation, oxidative decomposition, flue gas treatment, cooling and packaging. According to the invention, the recrystallized waste salt crystal grains containing organic matters are subjected to thermal decomposition and oxidation, so that the design purposes of low investment and extremely low operation cost are achieved, and the operation stability of the regeneration device containing organic waste salts and the reliability that the decomposition and oxidation rate of the organic matters is higher than 99.9% are considered; the invention does not produce secondary pollutant (HW 18), only produces little fly ash, does not produce salt steam and tiny crystal grains, and does not cause frequent blockage of flue gas pipelines.
Description
Technical Field
The invention relates to the field of waste salt recovery, in particular to a solid waste salt recycling process technology.
Background
The hazardous waste is also a centralized resource, the danger degree and the environmental hazard of the hazardous waste are not more than those of other chemical industries, and the resource disposal process is reasonably designed according to the standard requirements, so that the hazardous waste can generate huge social benefits and has obvious economic benefits. On one hand, a large amount of waste salt containing organic matters is produced by a large amount of chemical enterprises and pharmaceutical enterprises, and needs to be treated in time, so that the environmental protection pressure is inevitably reduced. The existing process route for treating and recycling high-cost waste salt restricts the development of fine chemical industry and is not beneficial to large-scale popularization and treatment technology, so that the low-cost method for treating the waste salt containing organic matters can effectively reduce the cost of related enterprises and is finally beneficial to the whole society.
Disclosure of Invention
The invention aims to solve the technical problems and provides a solid waste salt recycling process technology.
The purpose of the invention is realized as follows: a solid waste salt recycling process technology is characterized in that: the method comprises the following steps:
step 1: screening waste salt, namely screening the waste salt in the waste salt warehouse before the waste salt warehouse is taken out;
step 2: the compatibility is taken out of the warehouse, and the compatibility is sorted and taken out of the warehouse according to the compatibility list and the same inorganic waste salt but different heat values or different organic chlorine, fluorine, phosphorus and sulfur contents in the warehouse;
and step 3: crushing and dissolving, wherein the waste salt is sent to a double-roll crusher for mechanical crushing, and crushed waste salt particles or powder are sent to a closed dissolving tank through conveying equipment;
and 4, step 4: solid-liquid separation, namely solid-liquid separation of the waste salt solution, feeding the separated clear liquid into a clear liquid pool, and feeding the filter cake into a hazardous waste incineration system for incineration treatment;
and 5: crystallizing and separating, namely pumping clear liquid to an MVR system for recrystallization, thickening the clear liquid by a thickener, and feeding the thickened clear liquid into a material pushing centrifuge for separation;
and 7: treating flue gas, namely allowing fresh air to enter a cylinder cavity of the incineration rotary kiln after heat exchange with the flue gas and directly contacting with waste salt after recrystallization;
and 8: and (4) cooling and packaging, namely cooling the recrystallized waste salt which is fully decomposed and oxidized, then feeding the cooled waste salt into a buffer tank, and after the waste salt is detected to be qualified, feeding the waste salt into a packaging system for packaging when the temperature is below 60 ℃.
As a preferred technical scheme: the specific method of the discrimination work before warehouse-out in the step 1 is identification marks of warehouse waste salt packages, analysis sheet reports of tests, area color recognition, waste salt color recognition and the like.
As a preferred technical scheme: the waste salt compatible in the step 2 is finally (organic Cl: <1%, P, F: <0.2%, S < 1%) in principle, the Ph value is about 7 as far as possible, and the organic alkali metal (Na +, K +, Ca + < 0.1%).
As a preferred technical scheme: in the step 3, the waste salt particles or powder move in water at a high speed under the action of high-speed rotation of mechanical stirring and collide with each other to continuously crush; and most of the salt accelerates the diffusion of a solid-liquid phase interface under the stirring action to finally form a saturated waste salt water solution.
As a preferred technical scheme: and 3, heating the dissolving tank by using steam condensate or a heat source in the dissolving process to accelerate the movement speed of ions, and finally realizing rapid dissolution of the waste salt.
As a preferred technical scheme: and (4) feeding the waste salt solution in the step (4) into a buffer tank, and pumping the waste salt solution to a plate and frame filter for solid-liquid separation.
As a preferred technical scheme: in the recrystallization process in the step 5, the surface of the regenerated crystal grains is washed by saturated saline water or desalted water for one time or more times in different processes and different crystal grains.
The preferable technical scheme is that in the step 7, the burning rotary kiln is heated on the outer wall through a burner instead of directly contacting natural gas hot flue gas with recrystallized waste salt, the hot flue gas of the burner exchanges heat with fresh air entering the burning rotary kiln, and then enters a rotary dryer to pre-dry recrystallized salt, wherein the pre-drying is to directly contact the hot flue gas and recrystallized particles for heat exchange, the oxygen content of the hot flue gas after the burning rotary kiln is subjected to thermal decomposition and oxidation is controlled to be 6 ~ 10%, the hot flue gas after heat exchange enters a tail gas treatment system to be subjected to dioxin decomposition and harmful substance removal, and the treated tail gas meets the national standard and is discharged into the atmosphere.
Compared with the prior art, the invention has the advantages that:
1. the recrystallization can be controlled to be about 1mm, the content of organic matters in the recrystallized salt is less than that of the organic matters in the initial waste salt, the separated recrystallized waste salt is fully subjected to high-temperature oxidative decomposition in the oxygen atmosphere, after 40 ~ 240min, the Total Organic Carbon (TOC) content in the finished salt is lower than 30ppm, and the product quality widely meets the use or application standard in national economic production.
2. The manufacturing method provided by the invention has the advantages of short process flow, small equipment quantity and more than 30% lower investment compared with the existing common waste disposal center waste salt regeneration device.
3. The operation flexibility is large and reliable, and the oxygen content in the smoke can be detected simultaneously according to the condition that the material contains organic matters, and the time of thermal decomposition and oxidation can be adjusted as the detection basis of the thermal decomposition and oxidation degree.
4. The manufacturing method of the invention is a combined manufacturing method of one or more mature manufacturing methods, and has low operation risk.
5. One or more devices used by the manufacturing method are mature manufacturing devices, and the special requirements of a hazardous waste disposal center on resource manufacturing of organic waste salt are met by modifying one or more details in the manufacturing devices; the current situation that one or more universal manufacturing equipment can not meet the requirements is solved.
6. Such detail changes include, but are not limited to: alteration of material at one or more locations of one or more devices to meet corrosion requirements; the structural details of one or more parts of one or more of the devices are altered to meet the design requirements of particle size distribution control during processing, more uniform exposure to oxygen atmosphere during oxidative decomposition, and necessary residence time. .
Drawings
FIG. 1 shows the specification parameters of a part of a waste salt predrying machine
FIG. 2 shows part of specification parameters of the rotary kiln for incineration.
Detailed Description
The invention will be further described, but not limited, by reference to the following figures: a solid waste salt recycling process technology is characterized in that: the method comprises the following steps:
step 1: screening waste salt, namely screening the waste salt in the waste salt warehouse before the waste salt warehouse is taken out;
step 2: the compatibility is taken out of the warehouse, and the compatibility is sorted and taken out of the warehouse according to the compatibility list and the same inorganic waste salt but different heat values or different organic chlorine, fluorine, phosphorus and sulfur contents in the warehouse;
and step 3: crushing and dissolving, wherein the waste salt is sent to a double-roll crusher for mechanical crushing, and crushed waste salt particles or powder are sent to a closed dissolving tank through conveying equipment;
and 4, step 4: solid-liquid separation, namely solid-liquid separation of the waste salt solution, feeding the separated clear liquid into a clear liquid pool, and feeding the filter cake into a hazardous waste incineration system for incineration treatment;
and 5: crystallizing and separating, namely pumping clear liquid to an MVR system for recrystallization, thickening the clear liquid by a thickener, and feeding the thickened clear liquid into a material pushing centrifuge for separation;
and 7: treating flue gas, namely allowing fresh air to enter a cylinder cavity of the incineration rotary kiln after heat exchange with the flue gas and directly contacting with waste salt after recrystallization;
and 8: and (4) cooling and packaging, namely cooling the recrystallized waste salt which is fully decomposed and oxidized, then feeding the cooled waste salt into a buffer tank, and after the waste salt is detected to be qualified, feeding the waste salt into a packaging system for packaging when the temperature is below 60 ℃.
In the specific implementation: the method comprises the steps of firstly screening waste salt in a waste salt warehouse before delivery, and specifically comprises the steps of identifying marks of waste salt packages in the warehouse, analyzing sheet reports of tests, area color recognition, waste salt color recognition and the like. Then the waste salt after compatibility is finally (organic Cl <1%, P, F <0.2% and S < 1%) in principle, the Ph value is about 7 as far as possible, and the organic alkali metal (Na +, K +, Ca + < 0.1%).
Then the waste salt sorted out of the warehouse is sent to a double-roller crusher for mechanical crushing, the crushed waste salt particles or powder are sent to a closed dissolving tank through conveying equipment, and under the action of high-speed rotation of mechanical stirring, the waste salt particles or powder move in water at high speed and collide with each other for continuous crushing; and most of the salt accelerates the diffusion of a solid-liquid phase interface under the stirring action to finally form a saturated waste salt water solution. In the dissolving process, steam condensate is used or the temperature of the dissolving tank is raised through a heat source, so that the ion movement speed is accelerated, and finally, the waste salt is quickly dissolved. The dissolved waste salt solution enters a buffer tank, is conveyed to a plate-and-frame filter by a pump for solid-liquid separation, and the separated clear liquid enters a clear liquid pool; the filter cake enters a hazardous waste incineration system for incineration treatment; clear liquid in the clear liquid tank is pumped to an MVR system for recrystallization, and in the recrystallization process, saturated saline water or desalted water is carried out for one time or more times on different working procedures and different crystal grains to wash the surfaces of regenerated crystal grains; and finally, thickening the mixture by a thickener, feeding the mixture into a pusher centrifuge for separation, and continuously feeding the separated mother liquor into an MVR system.
Salt crystal grains enter an incineration rotary kiln through a buffer tank to be subjected to oxidative decomposition for 40 ~ 240min, the temperature is controlled to be 300-300 ~ 750 ℃, fresh air enters a cylinder cavity of the incineration rotary kiln after exchanging heat with flue gas and is in direct contact with waste salt after recrystallization, the incineration rotary kiln is heated on the outer wall through a burner, non-direct natural gas hot flue gas is in direct contact with waste salt after recrystallization, the hot flue gas of the burner is subjected to heat exchange with the fresh air entering the incineration rotary kiln, then enters a rotary dryer to pre-dry the recrystallized salt, the pre-drying is that the hot flue gas and the recrystallized grains are in direct contact heat exchange, the oxygen content of the hot flue gas after the incineration rotary kiln is subjected to thermal decomposition and oxidation is controlled to be 6 ~ 10%, and the hot flue gas after heat exchange enters a tail gas disposal system to be subjected to decomposition of dioxin and removal of harmful substances.
The treated tail gas meets the national standard and is discharged into the atmosphere. And finally, cooling the fully decomposed and oxidized recrystallized waste salt, then feeding the fully decomposed and oxidized recrystallized waste salt into a buffer tank, and after the fully decomposed and oxidized recrystallized waste salt is detected to be qualified, directly feeding the fully decomposed and oxidized recrystallized waste salt into a packaging system for packaging when the temperature is below 60 ℃.
The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, but not intended to limit the scope of the present invention, and all equivalent technical solutions also belong to the scope of the present invention, and the scope of the present invention should be defined by the claims.
Claims (8)
1. A solid waste salt recycling process technology is characterized in that: the method comprises the following steps:
step 1: screening waste salt, namely screening the waste salt in the waste salt warehouse before the waste salt warehouse is taken out;
step 2: the compatibility is taken out of the warehouse, and the compatibility is sorted and taken out of the warehouse according to the compatibility list and the same inorganic waste salt but different heat values or different organic chlorine, fluorine, phosphorus and sulfur contents in the warehouse;
and step 3: crushing and dissolving, wherein the waste salt is sent to a double-roll crusher for mechanical crushing, and crushed waste salt particles or powder are sent to a closed dissolving tank through conveying equipment;
and 4, step 4: solid-liquid separation, namely solid-liquid separation of the waste salt solution, feeding the separated clear liquid into a clear liquid pool, and feeding the filter cake into a hazardous waste incineration system for incineration treatment;
and 5: crystallizing and separating, namely pumping clear liquid to an MVR system for recrystallization, thickening the clear liquid by a thickener, and feeding the thickened clear liquid into a material pushing centrifuge for separation;
step 6, carrying out oxidative decomposition, namely allowing salt crystal grains to enter an incineration rotary kiln through a buffer tank, and carrying out oxidative decomposition for 40 ~ 240min, wherein the temperature is controlled to be 300 ~ 750 ℃ and 750 ℃;
and 7: treating flue gas, namely allowing fresh air to enter a cylinder cavity of the incineration rotary kiln after heat exchange with the flue gas and directly contacting with waste salt after recrystallization;
and 8: and (4) cooling and packaging, namely cooling the recrystallized waste salt which is fully decomposed and oxidized, then feeding the cooled waste salt into a buffer tank, and after the waste salt is detected to be qualified, feeding the waste salt into a packaging system for packaging when the temperature is below 60 ℃.
2. The recycling process technology of solid waste salt according to claim 1, which is characterized in that: the specific method of the discrimination work before warehouse-out in the step 1 is identification marks of warehouse waste salt packages, analysis sheet reports of tests, area color recognition, waste salt color recognition and the like.
3. The recycling process technology of solid waste salt according to claim 1, which is characterized in that: the waste salt compatible in the step 2 is finally (organic Cl: <1%, P, F: <0.2%, S < 1%) in principle, the Ph value is about 7 as far as possible, and the organic alkali metal (Na +, K +, Ca + < 0.1%).
4. The recycling process technology of solid waste salt according to claim 1, which is characterized in that: in the step 3, the waste salt particles or powder move in water at a high speed under the action of high-speed rotation of mechanical stirring and collide with each other to continuously crush; and most of the salt accelerates the diffusion of a solid-liquid phase interface under the stirring action to finally form a saturated waste salt water solution.
5. The recycling process technology of solid waste salt according to claim 1, which is characterized in that: and 3, heating the dissolving tank by using steam condensate or a heat source in the dissolving process to accelerate the movement speed of ions, and finally realizing rapid dissolution of the waste salt.
6. The recycling process technology of solid waste salt according to claim 1, which is characterized in that: and (4) feeding the waste salt solution in the step (4) into a buffer tank, and pumping the waste salt solution to a plate and frame filter for solid-liquid separation.
7. The recycling process technology of solid waste salt according to claim 1, which is characterized in that: in the recrystallization process in the step 5, the surface of the regenerated crystal grains is washed by saturated saline water or desalted water for one time or more times in different processes and different crystal grains.
8. The process technology for recycling solid waste salt as claimed in claim 1, wherein in step 7, the burning rotary kiln is heated on the outer wall through a burner, but the indirect natural gas hot flue gas directly contacts the recrystallized waste salt, the burner hot flue gas exchanges heat with fresh air in the burning rotary kiln, and then enters a rotary dryer to pre-dry the recrystallized salt, the pre-drying is realized by directly contacting and exchanging heat between the hot flue gas and recrystallized particles, the oxygen content of the hot flue gas generated after the burning rotary kiln is subjected to thermal decomposition and oxidation is controlled to be 6 ~ 10%, the hot flue gas after heat exchange enters a tail gas treatment system to perform decomposition of dioxin and removal of harmful substances, and the treated tail gas meets national standards and then is discharged into the atmosphere.
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| CN201911037317.1A CN110711764A (en) | 2019-10-29 | 2019-10-29 | Solid waste salt recycling process technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114368763A (en) * | 2021-12-28 | 2022-04-19 | 华夏碧水环保科技有限公司 | Comprehensive treatment method for industrial waste salt |
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