CN112320776B - Chemical waste liquid throwing and washing water regenerated acid recovery system and application thereof - Google Patents
Chemical waste liquid throwing and washing water regenerated acid recovery system and application thereof Download PDFInfo
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- CN112320776B CN112320776B CN202011092731.5A CN202011092731A CN112320776B CN 112320776 B CN112320776 B CN 112320776B CN 202011092731 A CN202011092731 A CN 202011092731A CN 112320776 B CN112320776 B CN 112320776B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/18—Phosphoric acid
- C01B25/234—Purification; Stabilisation; Concentration
- C01B25/2343—Concentration concomitant with purification, e.g. elimination of fluorine
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/88—Concentration of sulfuric acid
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/90—Separation; Purification
- C01B17/901—Recovery from spent acids containing metallic ions, e.g. hydrolysis acids, pickling acids
- C01B17/903—Recovery from spent acids containing metallic ions, e.g. hydrolysis acids, pickling acids by liquid-liquid extraction
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/68—Aluminium compounds containing sulfur
- C01F7/74—Sulfates
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Abstract
The invention relates to the technical field of industrial wastewater treatment and waste acid regeneration, in particular to a chemical polishing waste liquid and washing water regenerated acid recovery system which comprises a waste liquid collecting tank, an oil removal filtering device, a first extraction device, a second extraction device, a raffinate collecting device, a water washing device, a first back extraction device, a second back extraction device, a concentrated back extraction liquid collecting device, an evaporation concentration device and a chemical polishing agent recovery storage device which are sequentially communicated, wherein the water washing device is communicated with the first extraction device, the first extraction device is communicated with the first back extraction device, the first back extraction device is communicated with the second extraction device, the concentrated back extraction liquid collecting device is communicated with the evaporation concentration device, and a calcium sulfate production device is communicated with the second extraction device. The invention adopts a multistage extraction method to ensure that the recovery rate of phosphoric acid reaches more than 80 percent and the recovery rate of sulfuric acid reaches 50 percent, and dilute phosphoric acid and sulfuric acid produced by the second back extraction device are concentrated to 1.7 by specific gravity through an evaporation concentration device and can be directly recycled.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment and waste acid regeneration, in particular to a chemical waste liquid throwing and washing water regenerated acid recovery system and application thereof.
Background
Along with the development of economic construction and the enlargement of urban scale, the living standard of people is increasingly improved, the urban water consumption cannot meet the planning requirement, meanwhile, a large amount of triacid is consumed in the production of various chemical enterprises, surface treatment enterprises and the like, the triacid is required to be used for leveling, brightening and the like in the anodic oxidation industry, the metal surface treatment industry and the like through market investigation, wherein the phosphoric acid accounts for about 70 percent, and after the chemical polishing solution prepared in the production process is used for a period of time, the concentrations of aluminum ions, iron ions and metal ion impurities are increased continuously, so that the viscosity of the chemical polishing solution is increased more and more, the polishing effect is influenced, and therefore, part of the tank solution needs to be discharged periodically and part of new acid needs to be added to maintain the polishing effect in the tank solution. The chemical polishing liquid partially discharged and the one-step washing water treatment status of the chemical polishing liquid are divided into the following two types: firstly, collecting, evaporating and concentrating, and then partially recycling and partially outsourcing; discharging the waste water into a waste water station for treatment; the two processing modes have certain troubles for enterprises, and the first processing mode is as follows: 1. the medium and small enterprises are difficult to bear the investment and the operation cost of evaporation concentration equipment; 2. the companies who have the evaporation concentration equipment have the biggest problems that the concentrated acid contains a large amount of metal impurities such as aluminum ions and the like, only 20% of the concentrated acid is used on a production line, the rest 80% of the concentrated acid needs to be subjected to outsourcing treatment, the outsourcing involves the risks of leakage in the transportation process and environmental pollution caused by the leakage, and the outsourcing is used as waste liquid, so that the disposal cost is ultrahigh. The second processing mode is as follows: 1. the discharge to a sewage station causes the load of the whole sewage station to be overlarge, which is not beneficial to the stable standard reaching of the sewage station, especially the difficulty of the standard reaching of the total phosphorus is larger, the total phosphorus is discharged to the outside, the eutrophication of a sewage receiving body is easily caused, and the pollution to the external ecological environment is larger; 2. the strong acidity of water quality needs to consume a large amount of caustic soda flakes and lime to neutralize and remove phosphorus, a large amount of sludge is generated, the sludge reprocessing cost is high, a large amount of energy is consumed in transportation and disposal, the whole ecological environment is polluted, and the whole large environmental resource is wasted; 3. the waste acid contains a large amount of aluminum ions and lime alkali to generate a large amount of white flocs, the sludge-water separation of the flocs is difficult, the treatment cost is high, and the flocs are difficult to discharge after reaching the standard.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a recycling system for regenerated acid of chemical polishing waste liquid and washing water, which adopts a multistage extraction method to ensure that the recycling rate of phosphoric acid reaches over 80 percent and the recycling rate of sulfuric acid reaches 50 percent, wherein dilute phosphoric acid and sulfuric acid produced by a second back extraction device are subjected to specific gravity concentration to 1.7 by an evaporation concentration device and can be directly recycled to a production line, raffinate produced by the second extraction device is added with calcium oxide by a calcium sulfate production device to produce gypsum calcium sulfate which can be used as raw materials for cement factories or brick factories, and the adopted liquid-phase extraction agent can selectively extract phosphoric acid and sulfuric acid in the waste liquid so as to obtain relatively pure phosphoric acid and sulfuric acid which are continuously recycled to the production line, and the raffinate can also be prepared into water treatment agents such as sulfuric acid, aluminum sulfate and the like.
The purpose of the invention is realized by the following technical scheme: a recycling system for regenerated acid of chemical polishing waste liquid and washing water comprises a waste liquid collecting tank, an oil removing and filtering device, a water washing device, a first extraction device, a first back extraction device, a second extraction device, a calcium sulfate production device, a second back extraction device, a raffinate collecting device, a concentrated back extraction liquid collecting device, an evaporation and concentration device and a chemical polishing agent storage device, wherein the first extraction device, the first back extraction device, the second extraction device and the second back extraction device are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting tank is communicated with the inlet end of the oil removing and filtering device, the outlet end of the oil removing and filtering device is communicated with the first inlet end of the first extraction device, the outlet end of the water washing device is communicated with the second inlet end of the first extraction device, the first outlet end of the first extraction device is communicated with the first inlet end of the second extraction device, the second outlet end of the first extraction device is communicated with the first inlet end of the first back-extraction device, the other outlet end of the water washing device is communicated with the second inlet end of the first back-extraction device, the first outlet end of the second extraction device is communicated with the first inlet end of the second back-extraction device, the second outlet end of the second extraction device is communicated with the inlet end of the raffinate collecting device, and the outlet end of the raffinate collecting device is communicated with the calcium sulfate production device, the second outlet end of the first back-extraction device is communicated with the second inlet end of the second back-extraction device, the first outlet end of the second back-extraction device is communicated with the water washing device, the second outlet end of the second back-extraction device is communicated with the inlet end of the concentrated back-extraction liquid collecting device, the outlet end of the concentrated back-extraction liquid collecting device is communicated with the evaporation concentration device, the outlet end of the evaporation concentration device is communicated with the chemical polishing agent storage device, and the other outlet end of the evaporation concentration device is communicated with the other inlet end of the water washing device.
In the invention, waste liquid of a chemical polishing tank and a washing water are collected in a waste liquid collecting tank, the waste liquid in the waste liquid collecting tank is sent to a silicon carbide film oil removal filtering device for oil removal treatment, then the waste liquid is sent to a first extraction device to be mixed with an idle-load extraction agent obtained after an extraction agent is washed by water for first extraction treatment, a primary extraction residual liquid after the primary extraction treatment is sent to a second extraction device, a rich-load extraction agent after the primary extraction treatment is sent to the first back-extraction device to be mixed with the washing water after the extraction agent is washed by the water washing device for first back-extraction treatment, then a secondary extraction agent collected after the first back-extraction treatment is sent to the second extraction device to be mixed with the primary extraction residual liquid for second extraction treatment, and a secondary extraction residual liquid generated after the second extraction treatment is sent to a calcium sulfate production device for standby, and feeding the secondary extraction agent generated after the second extraction treatment into a second back-extraction device to be mixed with the primary back-extraction liquid generated by the first back-extraction treatment for second back-extraction treatment, returning the secondary extraction agent generated after the second back-extraction treatment to the next process for continuous recycling, feeding the concentrated back-extraction liquid generated after the second back-extraction treatment into an evaporation concentration device for treatment, and collecting to obtain a finished polishing agent, wherein the generated distilled water can be continuously returned to the next process for washing the extraction agent. The chemical polishing waste liquid and washing water regenerated acid recovery system adopts a multistage extraction method to ensure that the recovery rate of phosphoric acid reaches more than 80 percent and the recovery rate of sulfuric acid reaches 50 percent, wherein dilute phosphoric acid and sulfuric acid produced by the second back extraction device are concentrated to 1.7 in proportion by an evaporation concentration device, and can be directly reused in a production line, raffinate produced by the second extraction device is added with calcium oxide by a calcium sulfate production device to produce gypsum calcium sulfate, and can be used as raw materials for cement plants or brick factories, the adopted liquid-phase extraction agent can selectively extract phosphoric acid and sulfuric acid in waste acid to obtain relatively pure foaming agent which is continuously reused in the production line, and in addition, the raffinate can also be prepared into water treatment agents such as aluminum sulfate and the like, so that the environmental protection performance is further improved.
Preferably, the system further comprises a first feeding device which is arranged between the first outlet end of the second stripping device and the inlet end of the water washing device and used for adding the extractant, the inlet end of the first feeding device is communicated with the first outlet end of the second stripping device, and the outlet end of the first feeding device is communicated with the inlet end of the water washing device. The system also comprises a water adding device which is arranged between the outlet end of the evaporation concentration device and the inlet end of the water washing device and is used for adding pure water, one inlet end of the water adding device is communicated with the outlet end of the evaporation concentration device, and the outlet end of the water adding device is communicated with the other inlet end of the water washing device.
The volume ratio of the extracting agent to the pure water entering the water washing device can be well controlled to be 3.8-4.2:1 through the first feeding device and the water adding device, so that the extracting agent can be continuously washed by water to generate a no-load extracting agent, and the extraction treatment of the waste water in the waste liquid collecting pool is facilitated.
Preferably, the system further comprises a gypsum collecting device arranged at the outlet end of the calcium sulfate production device. The system also comprises a second feeding device for adding stone powder, and the outlet end of the second feeding device is communicated with the other inlet end of the calcium sulfate production device.
According to the invention, the stone powder can be added into the calcium sulfate production device through the second feeding device, and the stone powder and the secondary raffinate are stirred and mixed, so that finally the prepared calcium sulfate gypsum can be used as raw materials for a cement plant or a brick plant, or the raffinate is directly transferred to an aluminum sulfate plant to be used as a raw material for producing aluminum sulfate, and the environmental protection performance is further improved.
Preferably, the first extraction device and the second extraction device are both provided with an extraction agent, the extraction agent is a liquid-phase extraction agent, and the liquid-phase extraction agent comprises the following raw materials in parts by weight:
5-10 parts of n-butyl alcohol
10-20 parts of cyclohexanol
3.8-4.2 parts of cyclohexanone
20-30 parts of quaternary ammonium salt
10-20 parts of tributyl phosphate.
The extracting agent can be extracted at room temperature, so that the energy consumption and the material loss are saved, the extracting agent has high selectivity on phosphoric acid and sulfuric acid, the n-butyl alcohol is used as a matrix, and the high extraction characteristic of tributyl phosphate and the n-butyl alcohol on the phosphoric acid is utilized and the selectivity is improved by compounding the cyclohexanol and the cyclohexanone, so that chemical polishing waste liquid and washing water can be directly used for extraction and production of qualified polishing agents after oil removal, the production process is simplified, and the production cost is reduced.
Preferably, each part of the quaternary ammonium salt is at least one of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride, dodecyl dimethyl tertiary amine, trioctylamine and tetramethyl dodecyl benzene sulfonic acid ammonium; more preferably, each part of the quaternary ammonium salt is a mixture of dioctadecyldimethylammonium chloride, hexadecyltrimethylammonium chloride and tetramethyldodecylbenzenesulfonate in a weight ratio of 0.8-1.2:0.6-1.0: 0.4-0.8.
Preferably, the volume ratio of the extraction phase to the aqueous phase in the first stripping unit is 3.8-4.2: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device is 3.8-4.2: 1. The volume ratio of the extraction phase to the aqueous phase in the second back extraction device is 3.8-4.2: 1; the volume ratio of the extraction phase to the water phase of the second extraction device is 3.8-4.2: 1.
In the invention, the volume ratio of the extraction phase to the water phase in the first back extraction device is 3.8-4.2:1, the volume ratio of the extraction phase to the water phase in the first extraction device is 3.8-4.2:1, and the volume ratio of the extraction phase to the water phase in the second back extraction device is 3.8-4.2: 1; the volume ratio of the extraction phase to the water phase of the second extraction device is 3.8-4.2:1, and the proportion ratio is reasonable in design, so that the extraction and back extraction effects are ensured, and the energy consumption and the reagent loss are saved.
Preferably, the chemical polishing waste liquid and washing water regenerated acid recovery system is applied to the acid recovery treatment of industrial acid waste water and acid pickle liquor.
The chemical polishing waste liquid and washing water regenerated acid recovery system is applied to the acid recovery treatment of industrial acid waste water, can effectively recover and treat chemical polishing liquid generated in the production process and washing water in one step of the chemical polishing groove, realizes the advantages of less sludge discharge and recovery and reutilization of various acids, and realizes the resource utilization of waste.
The invention has the beneficial effects that: the chemical polishing waste liquid and washing water regenerated acid recovery system adopts a multistage extraction method to ensure that the recovery rate of phosphoric acid reaches more than 80 percent and the recovery rate of sulfuric acid reaches 50 percent, wherein dilute phosphoric acid and sulfuric acid produced by the second back extraction device pass through an evaporation concentration device to concentrate the recovered acid to 1.7 in specific gravity and can be directly reused in a production line, raffinate produced by the second extraction device is added with calcium oxide by a calcium sulfate production device to produce gypsum calcium sulfate which can be used as a raw material for cement factories or brick factories, and the adopted liquid phase extractant can selectively extract phosphoric acid and sulfuric acid in waste acid to obtain relatively pure chemical polishing agent which can be continuously reused in the production line.
Drawings
FIG. 1 is a schematic structural diagram of a chemical polishing waste liquid and washing water regenerated acid recovery system.
The reference signs are: 1-a waste liquid collecting tank, 2-an oil removing and filtering device, 3-a water washing device, 4-a first extraction device, 5-a first back extraction device, 6-a second extraction device, 7-a calcium sulfate production device, 8-a second back extraction device, 9-a raffinate collecting device, 10-a concentrated back extraction liquid collecting device, 11-an evaporation and concentration device, 12-a chemical polishing agent recovery and storage device, 13-a first feeding device, 14-a water adding device, 15-a second feeding device and 16-a gypsum collecting device.
Detailed Description
For the understanding of those skilled in the art, the present invention will be further described with reference to the following examples and the accompanying fig. 1, and the description of the embodiments is not intended to limit the present invention.
Example 1
A recycling system for regenerated acid of chemical polishing waste liquid and washing water comprises a waste liquid collecting pool 1, an oil removing and filtering device 2, a water washing device 3, a first extraction device 4, a first back extraction device 5, a second extraction device 6, a calcium sulfate production device 7, a second back extraction device 8, a raffinate collecting device 9, a concentrated back extraction liquid collecting device 10, an evaporation and concentration device 11 and a chemical polishing agent recycling and storing device 12, wherein the first extraction device 4, the first back extraction device 5, the second extraction device 6 and the second back extraction device 8 are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting pool 1 is communicated with the inlet end of the oil removing and filtering device 2, the outlet end of the oil removing and filtering device 2 is communicated with the first inlet end of the first extraction device 4, the outlet end of the water washing device 3 is communicated with the second inlet end of the first extraction device 4, the first outlet end of the first extraction device 4 is communicated with the first inlet end of the second extraction device 6, the second outlet end of the first extraction device 4 is communicated with the first inlet end of the first back extraction device 5, the other outlet end of the water washing device 3 is communicated with the second inlet end of the first back extraction device 5, the first outlet end of the second extraction device 6 is communicated with the first inlet end of the second back extraction device 8, and the second outlet end of the second extraction device 6 is communicated with the inlet end of the raffinate collecting device 9, the outlet end of the raffinate collecting device 9 is communicated with the calcium sulfate production device 7, the second outlet end of the first back-extraction device 5 is communicated with the second inlet end of the second back-extraction device 8, the first outlet end of the second back-extraction device 8 is communicated with the water washing device 3, the second outlet end of the second back-extraction device 8 is communicated with the inlet end of the concentrated back-extraction liquid collecting device 10, the outlet end of the concentrated back-extraction liquid collecting device 10 is communicated with the evaporation and concentration device 11, the outlet end of the evaporation and concentration device 11 is communicated with the chemical polishing agent recovery and storage device 12, and the other outlet end of the evaporation and concentration device 11 is communicated with the other inlet end of the water washing device 3.
The system further comprises a first feeding device 13 arranged between a first outlet end of the second back-extraction device 8 and an inlet end of the water washing device 3, wherein the first feeding device 13 is used for adding an extractant, the inlet end of the first feeding device 13 is communicated with a first outlet end of the second back-extraction device 8, and the outlet end of the first feeding device 13 is communicated with the inlet end of the water washing device 3.
The system further comprises a water adding device 14 arranged between the outlet end of the evaporation concentration device 11 and the inlet end 3 of the water washing device 3, wherein the water adding device 14 is used for adding pure water, one inlet end of the water adding device 14 is communicated with the outlet end of the evaporation concentration device 11, and the outlet end of the water adding device 14 is communicated with the other inlet end of the water washing device 3.
The system further comprises a gypsum collection device 16 arranged at the outlet end of the calcium sulphate production unit 7.
The system further comprises a second feeding device 15, wherein the second feeding device 15 is used for adding stone powder, and the inlet end of the second feeding device 15 is communicated with the other inlet end of the calcium sulfate production device 7.
The first extraction device 4 and the second extraction device 6 are both provided with an extracting agent, the extracting agent is a liquid phase extracting agent, and the liquid phase extracting agent comprises the following raw materials in parts by weight:
5 parts of n-butanol
Cyclohexanol 10 parts
Cyclohexanone 3.8 parts
20 parts of quaternary ammonium salt
10 parts of tributyl phosphate.
Each part of the quaternary ammonium salt is a mixture of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and tetramethyl dodecyl benzene sulfonic ammonium according to the weight ratio of 0.8-1.2:0.6-1.0: 0.4-0.8.
The volume ratio of the extraction phase to the aqueous phase in the first stripping unit 5 is 3.8: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device 4 was 3.8: 1.
The volume ratio of the extraction phase to the aqueous phase in the second stripping unit 8 was 3.8: 1; the volume ratio of the extraction phase to the aqueous phase of the second extraction device 6 is 3.8: 1.
The chemical waste liquid throwing and washing water regenerated acid recovery system is applied to the recovery treatment of industrial acid wastewater.
Example 2
A recycling system for regenerated acid of chemical polishing waste liquid and washing water comprises a waste liquid collecting pool 1, an oil removing and filtering device 2, a water washing device 3, a first extraction device 4, a first back extraction device 5, a second extraction device 6, a calcium sulfate production device 7, a second back extraction device 8, a raffinate collecting device 9, a concentrated back extraction liquid collecting device 10, an evaporation and concentration device 11 and a chemical polishing agent recycling and storing device 12, wherein the first extraction device 4, the first back extraction device 5, the second extraction device 6 and the second back extraction device 8 are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting pool 1 is communicated with the inlet end of the oil removing and filtering device 2, the outlet end of the oil removing and filtering device 2 is communicated with the first inlet end of the first extraction device 4, the outlet end of the water washing device 3 is communicated with the second inlet end of the first extraction device 4, the first outlet end of the first extraction device 4 is communicated with the first inlet end of the second extraction device 6, the second outlet end of the first extraction device 4 is communicated with the first inlet end of the first back extraction device 5, the other outlet end of the water washing device 3 is communicated with the second inlet end of the first back extraction device 5, the first outlet end of the second extraction device 6 is communicated with the first inlet end of the second back extraction device 8, and the second outlet end of the second extraction device 6 is communicated with the inlet end of the raffinate collecting device 9, the outlet end of the raffinate collecting device 9 is communicated with the calcium sulfate production device 7, the second outlet end of the first back-extraction device 5 is communicated with the second inlet end of the second back-extraction device 8, the first outlet end of the second back-extraction device 8 is communicated with the water washing device 3, the second outlet end of the second back-extraction device 8 is communicated with the inlet end of the concentrated back-extraction liquid collecting device 10, the outlet end of the concentrated back-extraction liquid collecting device 10 is communicated with the evaporation and concentration device 11, the outlet end of the evaporation and concentration device 11 is communicated with the chemical polishing agent recovery and storage device 12, and the other outlet end of the evaporation and concentration device 11 is communicated with the other inlet end of the water washing device 3.
The system further comprises a first feeding device 13 arranged between a first outlet end of the second back-extraction device 8 and an inlet end of the water washing device 3, wherein the first feeding device 13 is used for adding an extractant, the inlet end of the first feeding device 13 is communicated with a first outlet end of the second back-extraction device 8, and the outlet end of the first feeding device 13 is communicated with the inlet end of the water washing device 3.
The system further comprises a water adding device 14 arranged between the outlet end of the evaporation concentration device 11 and the inlet end 3 of the water washing device 3, wherein the water adding device 14 is used for adding pure water, one inlet end of the water adding device 14 is communicated with the outlet end of the evaporation concentration device 11, and the outlet end of the water adding device 14 is communicated with the other inlet end of the water washing device 3.
The system further comprises a gypsum collection device 16 arranged at the outlet end of the calcium sulphate production unit 7.
The system further comprises a second feeding device 15, wherein the second feeding device 15 is used for adding stone powder, and the inlet end of the second feeding device 15 is communicated with the other inlet end of the calcium sulfate production device 7.
The first extraction device 4 and the second extraction device 6 are both provided with an extracting agent, the extracting agent is a liquid phase extracting agent, and the liquid phase extracting agent comprises the following raw materials in parts by weight:
6 parts of n-butanol
Cyclohexanone 3.9 parts
Quaternary ammonium salt 23 parts
13 parts of tributyl phosphate.
Each part of the quaternary ammonium salt is a mixture of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and tetramethyl dodecyl benzene sulfonic ammonium according to the weight ratio of 0.9:0.7: 0.5.
The volume ratio of the extraction phase to the aqueous phase in the first stripping unit 5 was 3.9: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device 4 was 3.9: 1.
The volume ratio of the extraction phase to the aqueous phase in the second stripping unit 8 was 3.9: 1; the volume ratio of the extraction phase to the aqueous phase of the second extraction device 6 is 3.9: 1.
The chemical waste liquid throwing and washing water regenerated acid recovery system is applied to the recovery treatment of industrial acid wastewater.
Example 3
A recycling system for regenerated acid of chemical polishing waste liquid and washing water comprises a waste liquid collecting pool 1, an oil removing and filtering device 2, a water washing device 3, a first extraction device 4, a first back extraction device 5, a second extraction device 6, a calcium sulfate production device 7, a second back extraction device 8, a raffinate collecting device 9, a concentrated back extraction liquid collecting device 10, an evaporation and concentration device 11 and a chemical polishing agent recycling and storing device 12, wherein the first extraction device 4, the first back extraction device 5, the second extraction device 6 and the second back extraction device 8 are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting pool 1 is communicated with the inlet end of the oil removing and filtering device 2, the outlet end of the oil removing and filtering device 2 is communicated with the first inlet end of the first extraction device 4, the outlet end of the water washing device 3 is communicated with the second inlet end of the first extraction device 4, the first outlet end of the first extraction device 4 is communicated with the first inlet end of the second extraction device 6, the second outlet end of the first extraction device 4 is communicated with the first inlet end of the first back extraction device 5, the other outlet end of the water washing device 3 is communicated with the second inlet end of the first back extraction device 5, the first outlet end of the second extraction device 6 is communicated with the first inlet end of the second back extraction device 8, and the second outlet end of the second extraction device 6 is communicated with the inlet end of the raffinate collecting device 9, the outlet end of the raffinate collecting device 9 is communicated with the calcium sulfate production device 7, the second outlet end of the first back-extraction device 5 is communicated with the second inlet end of the second back-extraction device 8, the first outlet end of the second back-extraction device 8 is communicated with the water washing device 3, the second outlet end of the second back-extraction device 8 is communicated with the inlet end of the concentrated back-extraction liquid collecting device 10, the outlet end of the concentrated back-extraction liquid collecting device 10 is communicated with the evaporation and concentration device 11, the outlet end of the evaporation and concentration device 11 is communicated with the chemical polishing agent recovery and storage device 12, and the other outlet end of the evaporation and concentration device 11 is communicated with the other inlet end of the water washing device 3.
The system further comprises a first feeding device 13 arranged between a first outlet end of the second back-extraction device 8 and an inlet end of the water washing device 3, wherein the first feeding device 13 is used for adding an extractant, the inlet end of the first feeding device 13 is communicated with a first outlet end of the second back-extraction device 8, and the outlet end of the first feeding device 13 is communicated with the inlet end of the water washing device 3.
The system further comprises a water adding device 14 arranged between the outlet end of the evaporation concentration device 11 and the inlet end 3 of the water washing device 3, wherein the water adding device 14 is used for adding pure water, one inlet end of the water adding device 14 is communicated with the outlet end of the evaporation concentration device 11, and the outlet end of the water adding device 14 is communicated with the other inlet end of the water washing device 3.
The system further comprises a gypsum collection device 16 arranged at the outlet end of the calcium sulphate production unit 7.
The system further comprises a second feeding device 15, wherein the second feeding device 15 is used for adding stone powder, and the inlet end of the second feeding device 15 is communicated with the other inlet end of the calcium sulfate production device 7.
The first extraction device 4 and the second extraction device 6 are both provided with an extracting agent, the extracting agent is a liquid phase extracting agent, and the liquid phase extracting agent comprises the following raw materials in parts by weight:
7 parts of n-butanol
15 parts of cyclohexanol
Cyclohexanone 4.0 parts
25 parts of quaternary ammonium salt
And 15 parts of tributyl phosphate.
Each part of the quaternary ammonium salt is a mixture of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and tetramethyl dodecyl benzene sulfonic ammonium according to the weight ratio of 1.0:0.8: 0.6.
The volume ratio of the extraction phase to the aqueous phase in the first stripping unit 5 is 4: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device 4 was 4: 1.
The volume ratio of the extraction phase to the aqueous phase in the second stripping unit 8 is 4: 1; the volume ratio of the extraction phase to the aqueous phase of the second extraction device 6 is 4: 1.
The chemical waste liquid throwing and washing water regenerated acid recovery system is applied to the recovery treatment of industrial acid wastewater.
Example 4
A recycling system for regenerated acid of chemical polishing waste liquid and washing water comprises a waste liquid collecting pool 1, an oil removing and filtering device 2, a water washing device 3, a first extraction device 4, a first back extraction device 5, a second extraction device 6, a calcium sulfate production device 7, a second back extraction device 8, a raffinate collecting device 9, a concentrated back extraction liquid collecting device 10, an evaporation and concentration device 11 and a chemical polishing agent recycling and storing device 12, wherein the first extraction device 4, the first back extraction device 5, the second extraction device 6 and the second back extraction device 8 are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting pool 1 is communicated with the inlet end of the oil removing and filtering device 2, the outlet end of the oil removing and filtering device 2 is communicated with the first inlet end of the first extraction device 4, the outlet end of the water washing device 3 is communicated with the second inlet end of the first extraction device 4, the first outlet end of the first extraction device 4 is communicated with the first inlet end of the second extraction device 6, the second outlet end of the first extraction device 4 is communicated with the first inlet end of the first back extraction device 5, the other outlet end of the water washing device 3 is communicated with the second inlet end of the first back extraction device 5, the first outlet end of the second extraction device 6 is communicated with the first inlet end of the second back extraction device 8, and the second outlet end of the second extraction device 6 is communicated with the inlet end of the raffinate collecting device 9, the outlet end of the raffinate collecting device 9 is communicated with the calcium sulfate production device 7, the second outlet end of the first back-extraction device 5 is communicated with the second inlet end of the second back-extraction device 8, the first outlet end of the second back-extraction device 8 is communicated with the water washing device 3, the second outlet end of the second back-extraction device 8 is communicated with the inlet end of the concentrated back-extraction liquid collecting device 10, the outlet end of the concentrated back-extraction liquid collecting device 10 is communicated with the evaporation and concentration device 11, the outlet end of the evaporation and concentration device 11 is communicated with the chemical polishing agent recovery and storage device 12, and the other outlet end of the evaporation and concentration device 11 is communicated with the other inlet end of the water washing device 3.
The system further comprises a first feeding device 13 arranged between a first outlet end of the second back-extraction device 8 and an inlet end of the water washing device 3, wherein the first feeding device 13 is used for adding an extractant, the inlet end of the first feeding device 13 is communicated with a first outlet end of the second back-extraction device 8, and the outlet end of the first feeding device 13 is communicated with the inlet end of the water washing device 3.
The system further comprises a water adding device 14 arranged between the outlet end of the evaporation concentration device 11 and the inlet end 3 of the water washing device 3, wherein the water adding device 14 is used for adding pure water, one inlet end of the water adding device 14 is communicated with the outlet end of the evaporation concentration device 11, and the outlet end of the water adding device 14 is communicated with the other inlet end of the water washing device 3.
The system further comprises a gypsum collection device 16 arranged at the outlet end of the calcium sulphate production unit 7.
The system further comprises a second feeding device 15, wherein the second feeding device 15 is used for adding stone powder, and the inlet end of the second feeding device 15 is communicated with the other inlet end of the calcium sulfate production device 7.
The first extraction device 4 and the second extraction device 6 are both provided with an extracting agent, the extracting agent is a liquid phase extracting agent, and the liquid phase extracting agent comprises the following raw materials in parts by weight:
9 parts of n-butanol
Cyclohexanol 18 parts
Cyclohexanone 4.1 parts
28 parts of quaternary ammonium salt
And 18 parts of tributyl phosphate.
Each part of the quaternary ammonium salt is a mixture of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and tetramethyl dodecyl benzene sulfonic ammonium according to the weight ratio of 1.1:0.9: 0.7.
The volume ratio of the extraction phase to the aqueous phase in the first stripping unit 5 is 4.1: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device 4 was 4.1: 1.
The volume ratio of the extraction phase to the aqueous phase in the second stripping unit 8 was 4.1: 1; the volume ratio of the extraction phase to the aqueous phase of the second extraction device 6 is 4.1: 1.
The chemical waste liquid throwing and washing water regenerated acid recovery system is applied to the recovery treatment of industrial acid wastewater.
Example 5
A recycling system for regenerated acid of chemical polishing waste liquid and washing water comprises a waste liquid collecting pool 1, an oil removing and filtering device 2, a water washing device 3, a first extraction device 4, a first back extraction device 5, a second extraction device 6, a calcium sulfate production device 7, a second back extraction device 8, a raffinate collecting device 9, a concentrated back extraction liquid collecting device 10, an evaporation and concentration device 11 and a chemical polishing agent recycling and storing device 12, wherein the first extraction device 4, the first back extraction device 5, the second extraction device 6 and the second back extraction device 8 are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting pool 1 is communicated with the inlet end of the oil removing and filtering device 2, the outlet end of the oil removing and filtering device 2 is communicated with the first inlet end of the first extraction device 4, the outlet end of the water washing device 3 is communicated with the second inlet end of the first extraction device 4, the first outlet end of the first extraction device 4 is communicated with the first inlet end of the second extraction device 6, the second outlet end of the first extraction device 4 is communicated with the first inlet end of the first back extraction device 5, the other outlet end of the water washing device 3 is communicated with the second inlet end of the first back extraction device 5, the first outlet end of the second extraction device 6 is communicated with the first inlet end of the second back extraction device 8, and the second outlet end of the second extraction device 6 is communicated with the inlet end of the raffinate collecting device 9, the outlet end of the raffinate collecting device 9 is communicated with the calcium sulfate production device 7, the second outlet end of the first back-extraction device 5 is communicated with the second inlet end of the second back-extraction device 8, the first outlet end of the second back-extraction device 8 is communicated with the water washing device 3, the second outlet end of the second back-extraction device 8 is communicated with the inlet end of the concentrated back-extraction liquid collecting device 10, the outlet end of the concentrated back-extraction liquid collecting device 10 is communicated with the evaporation and concentration device 11, the outlet end of the evaporation and concentration device 11 is communicated with the chemical polishing agent recovery and storage device 12, and the other outlet end of the evaporation and concentration device 11 is communicated with the other inlet end of the water washing device 3.
The system further comprises a first feeding device 13 arranged between a first outlet end of the second back-extraction device 8 and an inlet end of the water washing device 3, wherein the first feeding device 13 is used for adding an extractant, the inlet end of the first feeding device 13 is communicated with a first outlet end of the second back-extraction device 8, and the outlet end of the first feeding device 13 is communicated with the inlet end of the water washing device 3.
The system further comprises a water adding device 14 arranged between the outlet end of the evaporation concentration device 11 and the inlet end 3 of the water washing device 3, wherein the water adding device 14 is used for adding pure water, one inlet end of the water adding device 14 is communicated with the outlet end of the evaporation concentration device 11, and the outlet end of the water adding device 14 is communicated with the other inlet end of the water washing device 3.
The system further comprises a gypsum collection device 16 arranged at the outlet end of the calcium sulphate production unit 7.
The system further comprises a second feeding device 15, wherein the second feeding device 15 is used for adding stone powder, and the inlet end of the second feeding device 15 is communicated with the other inlet end of the calcium sulfate production device 7.
The first extraction device 4 and the second extraction device 6 are both provided with an extracting agent, the extracting agent is a liquid phase extracting agent, and the liquid phase extracting agent comprises the following raw materials in parts by weight:
10 portions of n-butyl alcohol
Cyclohexanol 20 parts
Cyclohexanone 4.2 parts
30 parts of quaternary ammonium salt
And 20 parts of tributyl phosphate.
Each part of the quaternary ammonium salt is a mixture of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and tetramethyl dodecyl benzene sulfonic ammonium according to the weight ratio of 1.2:1.0: 0.8.
The volume ratio of the extraction phase to the aqueous phase in the first stripping unit 5 is 4.2: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device 4 was 4.2: 1.
The volume ratio of the extraction phase to the aqueous phase in the second stripping unit 8 was 4.2: 1; the volume ratio of the extraction phase to the aqueous phase of the second extraction device 6 is 4.2: 1.
The chemical waste liquid throwing and washing water regenerated acid recovery system is applied to the recovery treatment of industrial acid wastewater.
The performance test of the phosphoric acid treated by the chemical polishing waste liquid and the washing water regenerated acid recovery system in the embodiment 3 is carried out on the chemical polishing tank liquid and a washing water (the content of the phosphoric acid is more than or equal to 30 percent, and the specific gravity is more than or equal to 1.4), and the results are shown in the table 1:
| name (R) | Concentration of | Specific gravity of |
| Purified phosphoric acid | 20%-25% | 1.2-1.3 |
| Phosphoric acid after purification and concentration | ≧70% | ≧1.7 |
| Aluminum ion | ≤5g/L | / |
| Iron ion | ≤5g/L | / |
According to the content, the concentration of the purified phosphoric acid produced by the chemical polishing waste liquid and the washing water regenerated acid recovery system can be increased to 20-25% and the specific gravity is 1.2-1.3, the concentration of the purified and concentrated phosphoric acid can be increased to not less than 70% and the specific gravity is not less than 1.7, and in addition, the concentration of aluminum ions in the chemical polishing agent subjected to evaporation and concentration treatment can be reduced to not more than 15g/L and the concentration of iron ions can be reduced to not more than 5 g/L. The invention can effectively recycle and treat the chemical polishing waste liquid generated in the production process and the washing water of the chemical polishing groove, realizes the advantages of less sludge discharge amount and recycling and reutilization of the chemical polishing agent, and realizes the resource utilization of waste.
The above-described embodiments are preferred implementations of the present invention, and the present invention may be implemented in other ways without departing from the spirit of the present invention.
Claims (10)
1. The utility model provides a change and throw waste liquid and wash sour recovery system of water regeneration which characterized in that: the device comprises a waste liquid collecting pool, an oil removing and filtering device, a water washing device, a first extraction device, a first back extraction device, a second extraction device, a calcium sulfate production device, a second back extraction device, a raffinate collecting device, a concentrated back extract collecting device, an evaporation and concentration device and a chemical polishing agent recovery and storage device, wherein the first extraction device, the first back extraction device, the second extraction device and the second back extraction device are respectively provided with a first inlet end, a second inlet end, a first outlet end and a second outlet end; the outlet end of the waste liquid collecting tank is communicated with the inlet end of the oil removing and filtering device, the outlet end of the oil removing and filtering device is communicated with the first inlet end of the first extraction device, the outlet end of the water washing device is communicated with the second inlet end of the first extraction device, the first outlet end of the first extraction device is communicated with the first inlet end of the second extraction device, the second outlet end of the first extraction device is communicated with the first inlet end of the first back-extraction device, the other outlet end of the water washing device is communicated with the second inlet end of the first back-extraction device, the first outlet end of the second extraction device is communicated with the first inlet end of the second back-extraction device, the second outlet end of the second extraction device is communicated with the inlet end of the raffinate collecting device, and the outlet end of the raffinate collecting device is communicated with the calcium sulfate production device, the second outlet end of the first back-extraction device is communicated with the second inlet end of the second back-extraction device, the first outlet end of the second back-extraction device is communicated with the water washing device, the second outlet end of the second back-extraction device is communicated with the inlet end of the concentrated back-extraction liquid collecting device, the outlet end of the concentrated back-extraction liquid collecting device is communicated with the evaporation concentration device, the outlet end of the evaporation concentration device is communicated with the chemical polishing agent recovery and storage device, and the other outlet end of the evaporation concentration device is communicated with the other inlet end of the water washing device.
2. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 1, wherein: the system further comprises a first feeding device which is arranged between the first outlet end of the second back-extraction device and the inlet end of the water washing device and used for adding an extracting agent, the inlet end of the first feeding device is communicated with the first outlet end of the second back-extraction device, and the outlet end of the first feeding device is communicated with the inlet end of the water washing device.
3. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 1, wherein: the system also comprises a water adding device which is arranged between the outlet end of the evaporation concentration device and the inlet end of the water washing device and is used for adding pure water, one inlet end of the water adding device is communicated with the outlet end of the evaporation concentration device, and the outlet end of the water adding device is communicated with the other inlet end of the water washing device.
4. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 1, wherein: the system also comprises a second feeding device for adding stone powder, and the outlet end of the second feeding device is communicated with the other inlet end of the calcium sulfate production device.
5. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 1, wherein: the system also comprises a gypsum collecting device arranged at the outlet end of the calcium sulfate production device.
6. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 2, characterized in that: the first extraction device and the second extraction device are both provided with an extracting agent, each part of the extracting agent is a liquid-phase extracting agent, and the liquid-phase extracting agent comprises the following raw materials in parts by weight:
5-10 parts of n-butyl alcohol
10-20 parts of cyclohexanol
3.8-4.2 parts of cyclohexanone
20-30 parts of quaternary ammonium salt
10-20 parts of tributyl phosphate.
7. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 6, wherein: the quaternary ammonium salt is at least one of dioctadecyl dimethyl ammonium chloride, hexadecyl trimethyl ammonium chloride and tetramethyl dodecyl benzene sulfonic acid ammonium.
8. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 1, wherein: the volume ratio of the extraction phase to the water phase in the first back extraction device is 3.8-4.2: 1; the volume ratio of the extraction phase to the aqueous phase in the first extraction device is 3.8-4.2: 1.
9. The chemical polishing waste liquid and washing water regenerated acid recovery system as claimed in claim 1, wherein: the volume ratio of the extraction phase to the water phase in the second back extraction device is 3.8-4.2: 1; the volume ratio of the extraction phase to the water phase of the second extraction device is 3.8-4.2: 1.
10. The application of the chemical polishing waste liquid and washing water regenerated acid recovery system according to claim 1 is characterized in that: the system is applied to the treatment of recovering phosphoric acid and sulfuric acid from industrial acid wastewater and waste liquid.
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