CN115745256A - Method for preparing copper sulfate and sodium chloride from acidic waste etching solution - Google Patents
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Abstract
The invention relates to a method for preparing copper sulfate and sodium chloride by using acidic waste etching solution, which comprises the steps of adding the acidic waste etching solution into a pretreatment tank, adding metered sodium chlorate, oxidizing cuprous ions in the etching solution into copper ions, pumping the etching solution into a filter press for filter pressing after flocculation and impurity removal, and feeding filtrate into a storage tank; pumping the sodium carbonate solution into a filtrate storage tank to generate basic copper carbonate precipitate and a sodium chloride solution; pumping the mixed slurry into a filter press for filtering, delivering the separated copper precipitation mother liquor to an ion exchange system, mixing and washing a filter cake, pumping the filter cake into the filter press for filter pressing, and delivering washing water to the ion exchange system; transferring the basic copper carbonate to a size mixing acid dissolving tank, and mixing the size, wherein the water for size mixing is copper sulfate heptahydrate filtrate. The method can thoroughly remove heavy metals such as lead, arsenic and the like and impurities in the acidic waste etching solution to obtain a high-purity copper sulfate product, and meanwhile, a sodium chloride product is obtained by performing ion exchange and multi-effect evaporation crystallization on the filtrate generated in the previous process.
Description
Technical Field
The invention relates to a method for preparing copper sulfate and sodium chloride from acidic waste etching solution, belonging to the technical field of etching solution recovery.
Background
The copper-containing etching waste liquid mainly comes from an etching process of printed circuit board production or a copper plate etching process in the electronic component manufacturing industry, the etching liquid can corrode redundant copper foil on a circuit board or a copper plate, the concentration of copper ions in the etching liquid is continuously increased, when the content of the copper ions reaches a certain concentration, the efficiency of the etching liquid for corroding the copper is gradually reduced until the etching liquid is invalid, and the etching liquid becomes the etching waste liquid to be discharged, and the common copper-containing etching waste liquid comprises acidic copper-containing etching waste liquid, alkaline copper-containing etching waste liquid, copper-containing ferric trichloride etching waste liquid and the like. The acidic copper-containing waste etching solution mainly comprises Cu2+, H +, cuCl42-, cl-and trace heavy metal impurities (such as nickel, cadmium, arsenic, lead, chromium and the like). If a targeted treatment measure is not adopted, the direct discharge brings great harm to the environment and also causes resource waste.
The main methods for comprehensively utilizing the acidic waste etching solution at home and abroad include a substitution method, an electrolytic method, a synthesis method and the like. The replacement method consumes iron powder and chlorine gas, and simultaneously has low product purity and low recovery rate; although the copper produced by the electrolysis method has high purity, the power consumption is higher, the copper content in the wastewater is higher, and the wastewater needs further treatment; the synthesis method is most widely applied at present, but the main problems existing at present are that the copper content in mother liquor after copper sulfate crystallization is high, sodium salt in wastewater cannot be recycled, and environmental pollution and resource waste are caused.
The existing method for preparing copper sulfate by using waste etching solution has many defects.
Chinese invention CN201921306790.0 a system for producing copper sulfate from acidic etching solution, which introduces a system for producing copper sulfate from acidic etching solution, comprises a waste etching solution neutralization treatment system, a crystallization purification extraction system, a waste water neutralization extraction system and the like, wherein copper in the acidic etching waste solution is extracted by adopting an acid-base neutralization mode, and copper sulfate is generated by chemical combination reaction. The method has the problems that impurities are not removed in advance, so that the impurities can be precipitated into a copper sulfate product, and sodium chloride in wastewater is not recovered.
The invention patent CN201910235200.8 in China uses acidic and alkaline etching solution as raw material to produce copper sulfate, and introduces two steps of producing basic copper chloride by using acidic and alkaline etching solution and producing copper sulfate by using the obtained basic copper chloride. The method well removes impurities, but the copper ions in the wastewater are still high, no further recovery measures are taken, and simultaneously, sodium salts and ammonium salts in the wastewater are not recovered.
The general defects of the invention are that the copper content in the wastewater is still high, and sodium salt and ammonium salt in the wastewater are not recovered but directly subjected to water removal treatment, evaporated and crystallized and then buried in the form of mixed salt.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for preparing copper sulfate and sodium chloride by using acidic waste etching solution.
Particularly, the invention provides a method for preparing copper sulfate and sodium chloride by using acidic waste etching solution, which comprises the following steps:
s1, adding acidic waste etching solution into a pretreatment tank, adding metered sodium chlorate, oxidizing cuprous ions in the etching solution into copper ions, adjusting the pH value of the etching solution to precipitate heavy metal ions, performing flocculation and impurity removal, pumping the etching solution into a filter press for filter pressing, and feeding filtrate into a storage tank;
s2, pumping the metered sodium carbonate solution into a filtrate storage tank, heating and controlling the pH value to generate basic copper carbonate precipitate and a sodium chloride solution;
s3, pumping the mixed slurry after the reaction in the step two into a filter press for filtering, delivering the separated copper precipitation mother liquor to an ion exchange system, mixing and washing a filter cake, pumping the filter cake into the filter press for filter pressing, and delivering washing water to the ion exchange system;
s4, transferring the basic copper carbonate generated in the step II to a size mixing acid dissolving tank, and mixing the size, wherein the water for mixing the size is copper sulfate heptahydrate filtrate;
s5, filtering a small amount of insoluble substances from the copper sulfate solution generated in the step four by using a precision filter, performing water-cooling crystallization, and returning the insoluble substances to an acid dissolving tank for size mixing and acid dissolving;
s6, the copper deposition mother liquor generated in the third step is mainly sodium chloride solution, wherein the concentration of copper ions is 0.7-1.1 g/L, the quantitative copper deposition mother liquor is sent to chelate ion resin through a flowmeter to adsorb and remove the copper ions, and the sodium chloride solution enters a storage tank and then is pumped to a sodium chloride preparation process;
and S7, pumping the sodium chloride solution generated in the sixth step into a triple-effect evaporation crystallization device, performing centrifugal dehydration to generate sodium chloride wet salt, drying by a boiling fluidized bed, and packaging.
Preferably, in step S1, the pH of the etching solution is adjusted to 3 to 5,
preferably, in step S1, at least one of polyacrylamide, magnesium chloride or activated carbon is added after the metering to perform flocculation.
Preferably, in step S2, the metered sodium carbonate solution is pumped into a filtrate storage tank and heated to 60-70 ℃, and the pH is controlled to 7-10.
Preferably, in step S4, after the slurry is mixed, a proper amount of sulfuric acid is slowly added into the reaction tank, and the reaction temperature is controlled at 50-60 ℃, the stirring speed is 60-100 r/min, the pH value is 1.5-2, and the reaction is carried out for 30 minutes-1 hour.
Preferably, in the step S5, the copper sulfate slurry after water-cooling crystallization is pumped into a vacuum filter and washed, the filtrate enters a filtrate storage tank for storage, and then is pumped into a size mixing acid dissolving tank for size mixing.
Preferably, in the step S5, the filter cake is a wet product of blue vitriol, and the filter cake is fed into a vibrating fluidized bed for low-temperature drying after being metered to obtain a blue vitriol product.
Preferably, in step S6, the adsorbed copper ions are desorbed and regenerated by hydrochloric acid to obtain a copper chloride desorption solution, and the solution is returned to step two to neutralize and precipitate copper again.
Preferably, in step S7, the crystallized mother liquor after centrifugal dehydration enters a copper precipitation mother liquor tank, and is mixed with the copper precipitation mother liquor and pumped into an ion exchange system for treatment.
Has the advantages that: the method can thoroughly remove heavy metals such as lead, arsenic and the like and impurities in the acidic waste etching solution, and then obtains a high-purity copper sulfate product through the working procedures of neutralization, washing, acid dissolution, drying and the like. Meanwhile, a sodium chloride product is obtained by carrying out ion exchange and multi-effect evaporation crystallization on the filtrate generated in the previous working procedure, and the copper content in the wastewater is controlled to be lower than 0.5mg/L.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale.
In the drawings:
FIG. 1 is a flow chart of a method for preparing copper sulfate and sodium chloride from an acidic spent etching solution according to the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
The invention provides a method for preparing copper sulfate and sodium chloride by using acidic waste etching solution, which comprises the following steps:
step one), adding acidic waste etching solution into a pretreatment tank, proportionally adding metered sodium chlorate, and adding chlorite in the etching solution
Oxidizing copper ions into copper ions, adjusting the pH value of the etching solution to be between 3 and 5, precipitating heavy metal ions, adding the metered PAM, magnesium chloride, activated carbon and the like, stirring for a certain time, pumping the etching solution into a filter press for filter pressing, and feeding the filtrate into a storage tank;
step two), pumping the measured sodium carbonate solution into a filtrate storage tank, heating to 60-70 ℃, controlling the pH value to 7-10, and generating the alkali type
Copper carbonate precipitate and sodium chloride solution;
step three), pumping the mixed slurry obtained after the reaction in the step two into a filter press for filtering, sending the separated copper deposition mother liquor to an ion exchange system,
the filter cake is pumped into a filter press for filter pressing after size mixing and washing, and washing water is sent to an ion exchange system; (ii) a
And step four), transferring the basic copper carbonate generated in the step two to a size mixing acid dissolving tank, and mixing the size firstly, wherein the water for mixing the size is copper sulfate heptahydrate filtrate. After size mixing, slowly adding a proper amount of sulfuric acid into the reaction tank, controlling the reaction temperature at 50-60 ℃, the stirring speed at 60-100 r/min and the pH value at 1.5-2, and reacting for 30 minutes-1 hour.
And step five), filtering a small amount of insoluble substances from the copper sulfate solution generated in the step four by a precision filter, performing water-cooling crystallization, and returning the insoluble substances to an acid dissolution tank for size mixing and acid dissolution. Pumping the copper sulfate slurry after water-cooling crystallization into a vacuum filter and washing, storing the filtrate in a filtrate storage tank, and pumping into a size mixing acid dissolving tank for size mixing. The filter cake is wet product of blue vitriol, which is fed into the vibration fluidized bed to be dried at low temperature after being measured to obtain blue vitriol product.
And step six), the copper deposition mother liquor generated in the step three is mainly sodium chloride solution, a small amount of copper ions are remained at the same time, the concentration of the copper ions is about 0.7-1.1 g/L, a quantitative copper deposition mother liquor is sent into chelate ion resin through a flowmeter to adsorb and remove the copper ions, and the sodium chloride solution enters a storage tank and then is pumped into a sodium chloride preparation process. The absorbed copper ions are desorbed and regenerated by hydrochloric acid to obtain a copper chloride desorption solution, and the copper chloride desorption solution is returned to the second step for neutralizing and copper deposition again;
and step seven), pumping the sodium chloride solution generated in the step six into a triple-effect evaporation crystallization and centrifugal dehydration to generate sodium chloride wet salt, drying by a boiling fluidized bed, and packaging for sale. And (4) the crystallized mother liquor after centrifugal dehydration enters a copper precipitation mother liquor tank, is mixed with the copper precipitation mother liquor and is pumped into an ion exchange system for treatment.
Example one
1. 1000kg of acidic waste etching solution generated in the production process, 0.12 mol/L of H + ion concentration, 5.86% of copper, 0.26% of sodium, 0.003% of potassium, 0.002% of iron, 0.003% of calcium, 0.002% of heavy metal (nickel, cadmium, arsenic, lead and chromium) and a large amount of chloride ions are pumped into a pretreatment tank, 0.17kg of sodium chlorate is firstly added, the stirring reaction is carried out for 30 minutes, then the pH value of the solution is adjusted to be 3-4 by sodium carbonate, then 38g of magnesium chloride is added, the stirring is carried out for 20 minutes, then 20g of PAM is added, the stirring is carried out for 30 minutes, finally 1kg of powdered activated carbon is added, the stirring is carried out for 30 minutes again, a filter press is used for filtering, and the filtrate enters a filtrate storage tank;
2. heating the filtrate to 65 ℃ by using steam, slowly adding sodium carbonate, controlling the pH value of the filtrate to be between 8 and 9, filtering the filtrate by using a filter press after reacting for 1 hour, washing a filter cake twice by using clear water to obtain basic copper carbonate solid, and removing washing water and copper precipitation mother liquor to an ion exchange system;
3. transferring basic cupric carbonate to a size mixing acid dissolution tank, adding heptahydrate copper sulfate filtrate, stirring to be in a paste shape, slowly adding 40 percent sulfuric acid solution until the pH value is 1.5-2, reacting at the temperature of 55 ℃, stirring at the speed of 70 r/min, and reacting for 30 minutes to generate copper sulfate solution;
4. filtering the copper sulfate solution by a precision filter, controlling the temperature of the filtrate to be 10-20 ℃, separating out copper sulfate crystals, centrifugally filtering and washing after the crystallization is finished, sending the filtrate to a size mixing acid dissolution tank, and sending the copper sulfate crystals to a vibration fluidized bed for low-temperature drying to obtain 228.5kg of industrial-grade copper sulfate pentahydrate, wherein the content of CuSO4.5H2O is 97.3 percent, the content of arsenic is 0.0002 percent, the content of lead is 0.0003 percent, the content of iron is 0.002 percent, the content of chloride is 0.02 percent, and the content of water-insoluble substances is 0.04 percent;
5. in washing water and copper precipitation mother liquor generated in the process of synthesizing basic copper carbonate, the content of copper ions is 0.9g/L, after chelating ion exchange resin, the content of copper ions in the solution is reduced to 0.4mg/L, and when the resin is regenerated, the desorbed copper ions are sent into a filtrate storage tank and synthesized into the basic copper carbonate with etching solution of the next tank again;
6. sodium chloride solution generated by the ion exchange system enters a triple-effect evaporation system for evaporation and crystallization, and finally centrifugal dehydration is carried out, and wet salt is dried by a fluidized bed to obtain 288.1kg of industrial-grade sodium chloride, wherein the sodium chloride content is 98.1%, the moisture content is 0.3%, the water insoluble substances are 0.1%, the copper content is 0.01%, the nickel content is 0.001%, the cadmium content is 0.0003%, the chromium content is 0.0001%, the arsenic content is 0.0001%, and the lead content is 0.0002%.
Example two
1. 1000kg of acidic waste etching solution generated in the process, wherein the concentration of H + ions is 0.09 mol/L, the copper content is 9.41%, the sodium content is 0.32%, the potassium content is 0.002%, the iron content is 0.003%, the calcium content is 0.003%, the heavy metals (nickel, cadmium, arsenic, lead and chromium) are 0.007% and a large amount of chloride ions, the acidic waste etching solution is pumped into a pretreatment tank, 0.26kg of sodium chlorate is firstly added, the sodium chlorate is stirred and reacted for 30 minutes, then the pH value of the solution is adjusted to be 3-4 by sodium carbonate, then 43g of magnesium chloride is added and stirred for 20 minutes, 25g of PAM is added and stirred for 30 minutes, finally 1kg of powdered activated carbon is added, the solution is stirred for 30 minutes again and then filtered by a filter press, and the filtrate enters a filtrate storage tank;
2. heating the filtrate to 68 ℃ by using steam, slowly adding sodium carbonate, controlling the pH value of the filtrate to be between 8 and 9, filtering the filtrate by using a filter press after reacting for 1 hour, washing a filter cake twice by using clear water to obtain basic copper carbonate solid, and removing washing water and copper precipitation mother liquor to an ion exchange system;
3. transferring basic copper carbonate to a size mixing acid dissolving tank, adding copper sulfate heptahydrate filtrate and stirring to be in a paste shape, slowly adding 40% sulfuric acid solution until the pH value is 1.5-2, reacting at the temperature of 55 ℃, and stirring at the speed of 70 r/min, and reacting for 30 minutes to generate copper sulfate solution;
4. filtering the copper sulfate solution by using a precision filter, controlling the temperature of the filtrate to be 10-20 ℃, separating out copper sulfate crystals, centrifugally filtering and washing after the crystallization is finished, removing the filtrate to a size mixing acid dissolution tank, and sending the copper sulfate crystals to a vibration fluidized bed for low-temperature drying to obtain 367.4kg of industrial-grade blue sulfate pentahydrate, wherein the content of CuSO4.5H2O is 97.4 percent, the content of arsenic is 0.0001 percent, the content of lead is 0.0001 percent, the content of iron is 0.001 percent, the content of chloride is 0.03 percent, and the content of water-insoluble substances is 0.03 percent;
5. in washing water and copper precipitation mother liquor generated in the process of synthesizing basic copper carbonate, the content of copper ions is 0.8g/L, after chelating ion exchange resin, the content of copper ions in the solution is reduced to 0.5mg/L, and when the resin is regenerated, the desorbed copper ions are sent into a filtrate storage tank and synthesized into the basic copper carbonate with etching solution of the next tank again;
6. and (2) allowing a sodium chloride solution generated by the ion exchange system to enter a triple effect evaporation system for evaporation and crystallization, finally performing centrifugal dehydration, and drying wet salt by using a fluidized bed to obtain 227.3kg of industrial-grade sodium chloride, wherein the sodium chloride content is 98.0%, the moisture content is 0.3%, the water insoluble substance is 0.1%, the copper content is 0.01%, the nickel content is 0.0005%, the cadmium content is 0.0003%, the chromium content is 0.0002%, the arsenic content is 0.0001%, and the lead content is 0.0001%.
Example three
1. 1000kg of acidic waste etching solution generated in the production process, wherein the concentration of H + ions is 0.18 mol/L, the copper content is 4.45%, the sodium content is 0.22%, the potassium content is 0.003%, the iron content is 0.008%, the calcium content is 0.005%, the heavy metals (nickel, cadmium, arsenic, lead and chromium) content is 0.009%, and a large amount of chloride ions are pumped into a pretreatment tank, 0.12kg of sodium chlorate is firstly added, the sodium chlorate is stirred and reacted for 30 minutes, then the pH value of the solution is adjusted to 3-4 by sodium carbonate, 31g of magnesium chloride is added and stirred for 20 minutes, 25g of PAM is added and stirred for 30 minutes, 1kg of powdered activated carbon is finally added, the mixture is stirred for 30 minutes again and then filtered by a filter press, and the filtrate enters a filtrate storage tank;
2. heating the filtrate to 65 ℃ by using steam, slowly adding sodium carbonate, controlling the pH value of the filtrate to be between 8 and 9, filtering the filtrate by using a filter press after reacting for 1 hour, washing a filter cake twice by using clear water to obtain basic copper carbonate solid, and removing washing water and copper precipitation mother liquor to an ion exchange system;
3. transferring basic cupric carbonate to a size mixing acid dissolution tank, adding heptahydrate copper sulfate filtrate, stirring to be in a paste shape, slowly adding 40 percent sulfuric acid solution until the pH value is 1.5-2, reacting at the temperature of 55 ℃, stirring at the speed of 70 r/min, and reacting for 30 minutes to generate copper sulfate solution;
4. filtering the copper sulfate solution by a precision filter, controlling the temperature of the filtrate to be 10-20 ℃, separating out copper sulfate crystals, centrifugally filtering and washing after the crystallization is finished, removing the filtrate to a size mixing acid dissolution tank, and sending the copper sulfate crystals to a vibration fluidized bed for low-temperature drying to obtain 173.8kg of industrial-grade copper sulfate pentahydrate, wherein the content of CuSO4.5H2O is 97.1 percent, the content of arsenic is 0.0001 percent, the content of lead is 0.0002 percent, the content of iron is 0.002 percent, the content of chloride is 0.02 percent, and the content of water-insoluble substances is 0.03 percent;
5. in washing water and copper precipitation mother liquor generated in the process of synthesizing basic copper carbonate, the content of copper ions is 0.8g/L, after passing through chelating ion exchange resin, the content of copper ions in the solution is reduced to 0.4mg/L, and when the resin is regenerated, the desorbed copper ions are sent into a filtrate storage tank and are synthesized with etching solution of the next tank into basic copper carbonate again;
6. sodium chloride solution generated by the ion exchange system enters a triple-effect evaporation system for evaporation and crystallization, and finally, centrifugal dehydration is carried out, and then wet salt is dried by a fluidized bed to obtain 266.1kg of industrial-grade sodium chloride, wherein the content of sodium chloride is 98.4 percent, the moisture content is 0.4 percent, the water insoluble substance is 0.1 percent, the copper content is 0.005 percent, the nickel content is 0.0004 percent, the cadmium content is 0.0004 percent, the chromium content is 0.0001 percent, the arsenic content is 0.0001 percent, and the lead content is 0.0001 percent.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the disclosure herein is not limited to the particular combination of features described above, but also encompasses other combinations of features described above or equivalents thereof without departing from the spirit of the disclosure. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (9)
1. A method for preparing copper sulfate and sodium chloride by using acidic waste etching solution is characterized by comprising the following steps:
s1, adding acidic waste etching solution into a pretreatment tank, adding metered sodium chlorate, oxidizing cuprous ions in the etching solution into copper ions, adjusting the pH value of the etching solution to precipitate heavy metal ions, performing flocculation and impurity removal, pumping the etching solution into a filter press for filter pressing, and feeding filtrate into a storage tank;
s2, pumping the metered sodium carbonate solution into a filtrate storage tank, heating and controlling the pH value to generate basic copper carbonate precipitate and a sodium chloride solution;
s3, pumping the mixed slurry obtained after the reaction in the step two into a filter press for filtering, delivering the separated copper precipitation mother liquor to an ion exchange system, mixing and washing a filter cake, pumping the filter cake into the filter press for filter pressing, and delivering washing water to the ion exchange system;
s4, transferring the basic copper carbonate generated in the step II to a size mixing acid dissolving tank, and mixing the size, wherein the size mixing water is copper sulfate heptahydrate filtrate;
s5, filtering a small amount of insoluble substances from the copper sulfate solution generated in the step four by using a precision filter, performing water-cooling crystallization, and returning the insoluble substances to an acid dissolving tank for size mixing and acid dissolving;
s6, the copper precipitation mother liquor generated in the third step is mainly sodium chloride solution, wherein the concentration of copper ions is 0.7-1.1 g/L, a certain amount of copper precipitation mother liquor is sent into chelate ion resin through a flowmeter to be adsorbed to remove the copper ions, and the sodium chloride solution enters a storage tank and then is pumped to a sodium chloride preparation process;
and S7, pumping the sodium chloride solution generated in the sixth step into a triple-effect evaporation crystallization device, performing centrifugal dehydration to generate sodium chloride wet salt, drying by a boiling fluidized bed, and packaging.
2. The method for preparing copper sulfate and sodium chloride from acidic waste etching solution as claimed in claim 1, wherein in step S1, the pH of the etching solution is adjusted to 3-5.
3. The method for preparing copper sulfate and sodium chloride from the acidic waste etching solution as claimed in claim 1, wherein at least one of polyacrylamide, magnesium chloride or activated carbon is added for flocculation in step S1.
4. The method for preparing copper sulfate and sodium chloride from acidic waste etching solution as claimed in claim 1, wherein in step S2, the metered sodium carbonate solution is pumped into a filtrate storage tank to be heated to 60-70 ℃, and the pH is controlled to 7-10.
5. The method for preparing copper sulfate and sodium chloride from acidic waste etching solution as claimed in claim 1, wherein in step S4, a proper amount of sulfuric acid is slowly added into the reaction tank after slurry mixing, and the reaction temperature is controlled at 50-60 ℃, the stirring speed is 60-100 r/min, the pH value is 1.5-2, and the reaction is carried out for 30 minutes-1 hour.
6. The method for preparing copper sulfate and sodium chloride from acidic waste etching solution as claimed in claim 1, wherein in step S5, the copper sulfate slurry after water-cooling crystallization is pumped into a vacuum filter and washed, the filtrate enters a filtrate storage tank for storage, and then is pumped into a size mixing acid dissolution tank for size mixing.
7. The method for preparing copper sulfate and sodium chloride from acidic waste etching solution as claimed in claim 1, wherein in step S5, the filter cake is wet blue sulfate heptahydrate, which is metered and then sent to a vibrated fluidized bed for low-temperature drying to obtain the blue copper sulfate pentahydrate product.
8. The method for preparing copper sulfate and sodium chloride from the acidic waste etching solution as claimed in claim 1, wherein in step S6, the absorbed copper ions are regenerated by hydrochloric acid desorption to obtain a copper chloride desorption solution, and the copper chloride desorption solution is returned to step II to neutralize and precipitate copper again.
9. The method for preparing copper sulfate and sodium chloride from acidic waste etching solution as claimed in claim 1, wherein in step S7, the mother solution for crystallization after centrifugal dehydration is fed into a mother solution tank for copper precipitation, and is mixed with the mother solution for copper precipitation and then pumped into an ion exchange system for treatment.
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