CN113387494A - Method for removing and refining copper sulfate based on organic matters - Google Patents
Method for removing and refining copper sulfate based on organic matters Download PDFInfo
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- CN113387494A CN113387494A CN202110651586.8A CN202110651586A CN113387494A CN 113387494 A CN113387494 A CN 113387494A CN 202110651586 A CN202110651586 A CN 202110651586A CN 113387494 A CN113387494 A CN 113387494A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G3/00—Compounds of copper
- C01G3/10—Sulfates
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/203—Iron or iron compound
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Abstract
The invention discloses a method for removing and refining copper sulfate based on organic matters, which comprises the following steps: adding sponge copper into the brown oxidation waste liquid, heating and stirring to obtain a pretreatment liquid; neutralizing the pretreatment solution, stirring and heating to 70-90 ℃, and maintaining the temperature for 2-3 hours; keeping the temperature, adding 20-40 g/L of resin powder, stirring, naturally cooling to room temperature, and filtering to obtain filtrate and filter residue; adding 1% of activated carbon into the filtrate, simultaneously adding copper hydroxide and cuprous hydroxide solids, stirring for 1-2h, standing for precipitation for 2h, and filtering to obtain a secondary filtrate; evaporating and concentrating the secondary filtrate to 145-150 Baume degrees, stirring for the first time at room temperature to reduce the temperature to 50 ℃, then cooling with cooling circulating water and stirring for the second time to reduce the temperature to 40 ℃, separating the obtained feed liquid through a centrifugal machine, and washing with pure water to obtain a blue vitriod product.
Description
Technical Field
The invention relates to the technical field of brown oxidation waste liquid treatment, in particular to a method for removing refined copper sulfate based on organic matters.
Background
The browning treatment method generally comprises an electrolytic method, an extraction method, a decomplexation-degradation-electrodeposition method, a distillation method, a chemical sedimentation-biodegradation combined method and the like. Because the brown oxidation waste liquid has the characteristics of strong film forming capability and strong complexing capability, and is not easy to be oxidized and degraded due to the stable existence of the brown oxidation waste liquid under the conditions of strong acidity and weak oxidants (oxidants), and the like, the following treatment methods are determined to have some problems, including:
1. the chemical precipitation method, namely the acid-base neutralization method, is applied, the method has the advantages of simple process, high alkali consumption, difficult standard discharge of waste water and low copper recycling degree.
2. Because the content of inorganic salts such as copper sulfate in the brown oxidation waste liquid is too high, the brown oxidation waste liquid is not beneficial to the growth and the propagation of microorganisms, and therefore, the brown oxidation waste liquid is not suitable for being degraded by a biological method;
3. the publication No. CN201010610128.1 introduces a simple electrolysis process of brown oxide waste liquid, which is easy to form a brown black film on the surface of a cathode, increases the overpotential of copper deposition, causes very low current efficiency and is difficult to deposit copper on the cathode.
4. The publication No. CN201713399U introduces the method that brown oxidation waste liquid is concentrated, then cooled and crystallized to separate out copper sulfate crystals, so that the content of copper ions in the solution is reduced, and finally, the effective components of the brown oxidation liquid are analyzed and adjusted to obtain regenerated liquid, thereby achieving the purpose of recycling the brown oxidation liquid. Although the scheme can be recycled to a certain extent, the solubility of the copper sulfate is high, the acidity of the sulfuric acid is high in the concentration process, the corrosion inhibitor is decomposed, and the copper sulfate cannot be recycled for production completely without being influenced; meanwhile, the quality of the copper sulfate product is too poor, and good benefits cannot be obtained.
5. Distillation can also cause the decomposition of part of low-boiling point additives or the mutual reaction of some additives at a controlled temperature, so that part of effective components in the browning liquid are lost and the ratio of effective components in the original browning liquid is unbalanced; the existing automatic analysis technology generally adopts means such as electrochemical signals, specific gravity detectors and the like to monitor the brown oxidation waste liquor, and each effective component of the brown oxidation waste liquor cannot be monitored, so that the optimal proportion of the original brown oxidation waste liquor is difficult to achieve in automatic dosing adjustment, and multiple times of cyclic regeneration are difficult to realize; after the reduced pressure distillation and concentration, complex in the brownification waste liquid can not be decomplexed, so that the accumulation of the complex in the recycled waste liquid is caused, and the service time is influenced; the technology does not describe whether the copper-containing complex is separated in a crystalline state after being concentrated, wherein the main reason causing the brown oxidation solution to lose efficacy is that the brown oxidation solution forms a large amount of complexes in the solution and reduces the formation of a complex film layer on the surface of an inner-layer circuit board, so that if copper ions in a complex form still exist in the solution after crystallization, the effect of brown oxidation treatment after adjustment and regeneration is seriously influenced; and the reduced pressure distillation consumes a large amount of energy, has high equipment requirement and is expensive. Therefore, this technique cannot be applied effectively for a long period of time in the actual treatment of browned wastewater.
6. The publication No. CN201610791660 introduces a method for recovering corrosion inhibitor and copper, which is too complicated and tedious in process, and the purity of the recovered organic matter introduced into the extractant is not enough, thus being not beneficial to subsequent recycling; copper ions are recovered by an electrolytic method, and the concentration of the copper ions in the solution is too low, so that the electrolytic efficiency is low, the energy consumption is high, and the method is not the most effective disposal method.
Accordingly, the prior art is deficient and needs improvement.
Disclosure of Invention
The invention mainly aims to provide a method for removing refined copper sulfate based on organic matters, which aims to simply and efficiently remove the organic matters in brown oxidation waste liquid, so that a copper sulfate product can reach industrial and feed standards, and the additional value of the product is further improved.
In order to achieve the purpose, the invention provides a method for removing and refining copper sulfate based on organic matters, which comprises the following steps:
s1: adding sponge copper into the brown oxidation waste liquid, heating and stirring to obtain a pretreatment liquid;
s2: neutralizing the pretreatment solution, adjusting the pH of the pretreatment solution to 1, stirring and heating to 70-90 ℃, and maintaining the temperature for 2-3 hours; adding 20-40 g/L resin powder while preserving heat, stirring and naturally cooling to room temperature, and filtering to obtain filtrate and filter residue, wherein the resin powder is waste resin powder in the PCB industry;
s3: adding 1% of activated carbon into the filtrate, simultaneously adding copper hydroxide and cuprous hydroxide solids, stirring for 1-2h, standing for precipitation for 2h, and filtering to obtain a secondary filtrate;
s4: evaporating and concentrating the secondary filtrate to 145-150 Baume degrees, carrying out primary stirring at room temperature to reduce the temperature to 50 ℃, then cooling to 40 ℃ by using circulating cooling water and carrying out secondary stirring at the same time, wherein the speed of the primary stirring is smaller than that of the secondary stirring, separating the obtained feed liquid by using a centrifugal machine, and washing by using pure water to obtain a copper sulfate pentahydrate product.
Preferably, the adding amount of the sponge copper is 10-35 g/L.
Preferably, in step S2, the pre-treatment solution is neutralized by adding copper oxide or copper hydroxide.
Preferably, in step S2, the resin powder includes at least one of drilling powder and pressing resin powder.
Preferably, in step S3, the addition amount of the copper hydroxide is 0.25-1.5 g/L, and the addition amount of the cuprous hydroxide is 0.05-0.5 g/L.
Preferably, in step S4, the first stirring speed is set to 30r/min, and the second stirring speed is set to 60 r/min.
Compared with the prior art, the invention has the beneficial effects that:
1. the waste resin powder is added to adsorb the organic matters in the browned waste liquid, so that the cost for removing the organic matters is greatly reduced;
2. removing organic matters in the waste liquor by carrying out a neutralization method-complexation method-thermal method-adsorption synergistic method on the brownification waste liquor, so that the organic matters in the waste liquor can achieve the maximum removal effect;
3. various impurities in the filtrate are removed by adding various impurity removing agents, so that the quality of the copper sulfate pentahydrate product is further improved;
4. the problem that a large amount of foam caused by subsequent neutralization reaction is difficult to eliminate is solved by adding sponge copper and removing the oxidant in a heating mode;
5. and the slow-fast combination mode is adopted for cooling in a segmented manner, so that a better copper sulfate product crystal form can be obtained.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow diagram of the process of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The method for removing and refining copper sulfate based on organic matters, which is provided by the embodiment, comprises the following steps:
s1 pretreatment: adding sponge copper into the brown oxidation waste liquid, heating and stirring, wherein the adding amount of the sponge copper is 10-35 g/L, and obtaining a pretreatment liquid; the sponge copper can remove the oxidant in the browning waste liquid, the addition of the sponge copper not only effectively utilizes the oxidant in the waste liquid, but also ensures that redundant sponge copper reacts with bivalent copper ions in the solution to form monovalent copper, the monovalent copper is complexed with BTA to form a Cu-BTA polymeric precipitate, partial organic matters in the waste liquid can be removed, and the main reaction is as follows:
Cu+H2O2+H2SO4→CuSO4+2H2O
Cu+Cu2+→2Cu+
BTA+Cu+→BTA-Cu+
s2 organic removal: adding copper oxide or copper hydroxide into the pretreatment solution for neutralization treatment, adjusting the pH of the pretreatment solution to 1, stirring and heating to 70-90 ℃, maintaining the temperature for 2-3 hours, and unstably separating out organic matters at high temperature; adding 20-40 g/L resin powder (the resin powder comprises at least one of drilling powder and pressed resin powder, the resin powder belongs to resin powder, organic matters in the solution can be adsorbed to a great extent through physical adsorption, the organic matters in the solution are further removed, a small amount of copper metal contained in the resin powder can react with copper ions to generate monovalent copper ions, the organic matters are further removed), stirring and naturally cooling to room temperature, and filtering to obtain filtrate and filter residue, wherein the resin powder is waste resin powder in the PCB industry;
removing impurities from the S3 filtrate: adding 1% of activated carbon into the filtrate, simultaneously adding copper hydroxide and cuprous hydroxide solids to remove trace iron ions and chloride ions in the solution, stirring for 1-2h, standing for 2h, precipitating, and filtering to obtain secondary filtrate;
s4 copper sulfate synthesis: evaporating and concentrating the secondary filtrate to 145-150 Baume degrees, carrying out primary stirring at room temperature to reduce the temperature to 50 ℃, then cooling to 40 ℃ by using circulating cooling water and carrying out secondary stirring at the same time, wherein the speed of the primary stirring is smaller than that of the secondary stirring, separating the obtained feed liquid by using a centrifugal machine, and washing by using pure water to obtain a copper sulfate pentahydrate product. Wherein the first stirring speed is set to be 30r/min, and the second stirring speed is set to be 60 r/min.
It should be noted that the brown oxidation waste liquid contains a large amount of copper metal, sulfuric acid and organic matters, and in order to realize resource utilization of copper, a plurality of copper extraction methods have been provided for the waste liquid, but the obtained copper sulfate product has low quality or a long process flow and is complex to operate. The invention aims to simply and efficiently remove organic matters in the waste liquid, so that a copper sulfate product can reach industrial and feed grade standards, and the additional value of the product is further improved. The invention firstly proposes that waste resin powder in the PCB industry is used for adsorbing organic matters in brown waste liquid, copper powder in the resin powder is used for generating monovalent copper ions, the organic matters are further removed, and the purpose of treating waste with waste is achieved; copper contained in the resin powder is used for reacting with the brown oxidation waste liquid, so that the chemical action of sulfuric acid and an oxidant is utilized, and simultaneously copper metal in the resin powder is recovered, so that the maximum utilization of resources is achieved; meanwhile, organic matters are removed by a neutralization method, a complexation method, a thermal method and an adsorption synergistic method.
The method is illustrated below by means of specific examples:
adding 20g/L of sponge copper into the brownification waste liquid, starting stirring and heating simultaneously, and reacting with an oxidant in the waste liquid; after reacting for 1 hour, filtering the solution to obtain a pretreatment solution for later use; neutralizing the pretreatment solution with copper oxide, adjusting the pH to about 1, stirring and heating simultaneously, and maintaining the temperature at 70-90 ℃ for 2-3 hours; keeping the temperature, adding 25g/L of resin powder, naturally cooling to room temperature under stirring, filtering to obtain filter residue and filtrate, and treating the filter residue separately to obtain filtrate; adding 0.5% of active carbon into the filtrate to further remove a small amount of organic matters; simultaneously adding 0.75g/L of copper hydroxide and 0.15g/L of cuprous hydroxide solid, and removing trace iron ions and chloride ions in the solution; adding the medicament, stirring the solution for 1-2h, standing for 2h for precipitation, and filtering to obtain a secondary filtrate; evaporating and concentrating the obtained secondary filtrate to 147 Baume degrees, then starting stirring at room temperature, controlling the stirring speed at 30r/min, and cooling to 50 ℃; cooling with circulating cooling water, increasing stirring speed to 60r/min, cooling to 40 deg.C, separating the feed liquid with centrifuge, and cleaning with small amount of pure water to obtain electroplating-grade copper sulfate pentahydrate product meeting national standard.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A method for removing and refining copper sulfate based on organic matters is characterized by comprising the following steps:
s1: adding sponge copper into the brown oxidation waste liquid, heating and stirring to obtain a pretreatment liquid;
s2: neutralizing the pretreatment solution, adjusting the pH of the pretreatment solution to 1, stirring and heating to 70-90 ℃, and maintaining the temperature for 2-3 hours; adding 20-40 g/L resin powder while preserving heat, stirring and naturally cooling to room temperature, and filtering to obtain filtrate and filter residue, wherein the resin powder is waste resin powder in the PCB industry;
s3: adding 1% of activated carbon into the filtrate, simultaneously adding copper hydroxide and cuprous hydroxide solids, stirring for 1-2h, standing for precipitation for 2h, and filtering to obtain a secondary filtrate;
s4: evaporating and concentrating the secondary filtrate to 145-150 Baume degrees, carrying out primary stirring at room temperature to reduce the temperature to 50 ℃, then cooling to 40 ℃ by using circulating cooling water and carrying out secondary stirring at the same time, wherein the speed of the primary stirring is smaller than that of the secondary stirring, separating the obtained feed liquid by using a centrifugal machine, and washing by using pure water to obtain a copper sulfate pentahydrate product.
2. The method for removing and refining copper sulfate based on organic matters according to claim 1, wherein the amount of the sponge copper added is 10-35 g/L.
3. The method for refining copper sulfate based on removal of organic matter according to claim 1, wherein the pre-treatment solution is neutralized by adding copper oxide or copper hydroxide in step S2.
4. The method for refining copper sulfate based on organic removal as claimed in claim 1, wherein in step S2, the resin powder comprises at least one of drilling powder and pressing resin powder.
5. The method for removing and purifying copper sulfate based on organic matters as claimed in claim 1, wherein in the step S3, the addition amount of copper hydroxide is 0.25-1.5 g/L, and the addition amount of cuprous hydroxide is 0.05-0.5 g/L.
6. The method for refining copper sulfate based on organic matter removal as recited in claim 1, wherein in step S4, the first stirring speed is set to 30r/min and the second stirring speed is set to 60 r/min.
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Application publication date: 20210914 |