CN111041248B - Method for recovering valuable metals in chlorine-containing waste liquid - Google Patents
Method for recovering valuable metals in chlorine-containing waste liquid Download PDFInfo
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- CN111041248B CN111041248B CN201911348511.1A CN201911348511A CN111041248B CN 111041248 B CN111041248 B CN 111041248B CN 201911348511 A CN201911348511 A CN 201911348511A CN 111041248 B CN111041248 B CN 111041248B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B47/00—Obtaining manganese
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G45/00—Compounds of manganese
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G9/00—Compounds of zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention belongs to the field of wet metallurgy, and discloses a method for recovering valuable metals in chlorine-containing waste liquid, which comprises the following steps: (1) adjusting the pH value of the chlorine-containing waste liquid to 0.8-1.2 by using a sodium hydroxide solution; (2) adding a flocculating agent into the chlorine-containing waste liquid treated in the step 1), adding a sodium hydroxide solution to adjust the pH of the chlorine-containing waste liquid to 4.1 +/-0.1, standing, and filtering to obtain a filtrate A and a filter residue B; (3) passing the filtrate A through a macroporous chelate resin column, and performing column chromatography separation to obtain a solution C; (4) regenerating the macroporous chelating resin by using a sulfuric acid solution to obtain a desorption liquid; (5) adding a sodium carbonate solution into the solution C for reaction, aging and filtering to obtain manganese carbonate; (6) and adding a sodium carbonate solution into the desorption liquid for reaction, aging and filtering to obtain the zinc carbonate. The recovery method can gradually separate the elements such as iron, zinc, manganese and the like in the chlorine-containing waste liquid, thereby realizing the recycling and reduction treatment of the waste.
Description
Technical Field
The invention belongs to the technical field of wet metallurgy, and particularly relates to a method for recovering valuable metals in chlorine-containing waste liquid.
Background
Because the nickel-cobalt-manganese battery anode material is very sensitive to iron element, the iron ion content in the production raw material liquid needs to be controlled below 1 ppm. The wet process removes iron ions in the feed liquid through the extraction of an organic extractant, and achieves the purpose of controlling the iron ion content index in the feed liquid. While iron ions are continuously enriched in the extractant. During the backwashing regeneration process of the extractant, chlorine-containing waste liquid containing a large amount of iron, manganese, zinc and other ions is generated.
The heavy metal chlorine-containing waste liquid is usually treated by a precipitation method, liquid alkali is added into the waste liquid, the system is adjusted to be alkaline, and metal ions are all converted into hydroxide. Flocculent precipitate is generated under the assistance of flocculant. The precipitate is filtered to achieve the separation purpose.
Three problems exist in the treatment of chlorine-containing waste liquid by a precipitation method: 1. the consumption of auxiliary feed liquid is high, the precipitation reaction is carried out in an alkaline environment, and after the precipitation is finished, the pH of the system needs to be adjusted back to be neutral by acid so as to be discharged; 2. the product is dangerous solid waste and has large amount; 3. the treatment cost is high.
Disclosure of Invention
The invention aims to provide a method for recovering valuable metals in chlorine-containing waste liquid; the method can gradually separate the elements such as iron, zinc, manganese and the like in the chlorine-containing waste liquid, thereby realizing the recycling and reduction of wastes.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for recovering valuable metals in chlorine-containing waste liquid comprises the following steps:
(1) adjusting the pH value of the chlorine-containing waste liquid to 0.8-1.2 by using a sodium hydroxide solution;
(2) adding a flocculating agent into the chlorine-containing waste liquid treated in the step (1), adding a sodium hydroxide solution to adjust the pH of the chlorine-containing waste liquid to 4.1 +/-0.1, standing, and filtering to obtain a filtrate A and a filter residue B;
(3) passing the filtrate A through a macroporous chelate resin column, and performing column chromatography separation to obtain a solution C;
(4) regenerating the macroporous chelating resin by using a sulfuric acid solution to obtain a desorption liquid;
(5) adding a sodium carbonate solution into the solution C for reaction, aging and filtering to obtain manganese carbonate;
(6) and adding a sodium carbonate solution into the desorption liquid for reaction, aging and filtering to obtain the zinc carbonate.
Preferably, H of the chlorine-containing waste liquid in the step (1)+The concentration is 2.31-2.44 mol/L.
Preferably, the chlorine-containing waste liquid obtained in the step (1) contains Zn2+1.5-1.7g/L, Mn content2+28.5-30g/L, Fe3 +Is 0.9-1.05 g/L.
Preferably, the mass percent of the sodium hydroxide solution in the step (1) is 28-32%.
Preferably, the flocculant in step (2) is polyacrylamide.
Preferably, the column flow rate for the column chromatography separation in step (3) is 3-5 BV/h.
Preferably, the model of the macroporous chelating resin column in the step (3) is D201.
Preferably, the mass percent of the sulfuric acid solution in the step (4) is 5-10%.
Preferably, the flow rate of the column for regenerating the macroporous chelating resin in the step (4) is 1-2 BV/h.
The invention has the advantages that:
1. the recovery method can gradually separate the elements such as iron, zinc, manganese and the like in the chlorine-containing waste liquid, thereby realizing the recycling and reduction of the waste.
2. The recovery method can generate high-purity metal salt from valuable metals in the chlorine-containing waste liquid or be used for producing the nickel-cobalt-manganese ternary precursor of the battery, thereby changing waste into valuable.
Detailed Description
For a further understanding of the invention, preferred embodiments of the invention are described below with reference to the examples to further illustrate the features and advantages of the invention, and any changes or modifications that do not depart from the gist of the invention will be understood by those skilled in the art to which the invention pertains, the scope of which is defined by the scope of the appended claims.
Example 1
A method for recovering valuable metals in chlorine-containing waste liquid comprises the following steps:
(1) at room temperature, firstly pouring 50L of chlorine-containing waste liquid into a 100L stirring tank, starting a stirrer, adding 29.6 mass percent of sodium hydroxide solution while stirring for acid-base neutralization, detecting the pH value of liquid in the stirring tank on line by adopting a Mettler pH meter, and when the pH value of a system reaches 1.0, adding 11.15L of sodium hydroxide;
(2) adding 0.1g of flocculant PAM (polyacrylamide), adding a sodium hydroxide solution, adding 12.10L of the sodium hydroxide solution when the pH value of the system reaches 4.1, standing, filtering the system liquid by using a filter press to obtain iron hydroxide filter residue A and filtrate B, fully filtering to remove water, and measuring that the water content of the filter residue is about 28.0% and the weight of the filter residue is 130 g;
(3) conveying the filtrate A to pass through D201 macroporous chelating resin by a peristaltic pump, controlling the column passing speed to be 4.5BV/h, performing adsorption separation of zinc element and manganese element, detecting the content of zinc ions in the solution C at the outlet of the second-stage adsorption resin, and stopping adsorption operation when the content of the zinc ions in the solution C reaches 1 mg/L;
(4) regenerating the D201 macroporous chelate resin with saturated adsorption by using 8% sulfuric acid solution, controlling the flow rate to be 1.5BV/h, detecting that the content of zinc ions in the desorption liquid reaches 10mg/L, finishing the desorption operation, cleaning the residual acid liquid in the resin column by using pure water, detecting the pH value of the oral liquid by using a pH meter, and finishing the resin regeneration operation when the pH value of the outlet cleaning liquid is more than 3;
(5) adding a sodium carbonate solution into the solution C to generate manganese carbonate, recrystallizing, and filtering to obtain manganese carbonate;
(6) adding sodium carbonate solution into the desorption solution to generate zinc carbonate, recrystallizing, and filtering to obtain the zinc carbonate.
Taking the volume of the chlorine-containing waste liquid in the step (1), and measuring the H of the chlorine-containing waste liquid+The concentration is 2.31 mol/L.
Table one: composition of chlorine-containing waste liquid
And (3) detecting the filtrate A in the step (2), wherein the content of metal ions is shown in a table II.
Table two: composition of filtrate A
| Composition of filtrate A | Zn2+ | Mn2+ | Fe3+ |
| Content g/L | 1.2263 | 23.4351 | 0.0000 |
And (4) taking the solution C in the step (3) for detection, wherein the detection result is shown in the third table.
Table three: composition of solution C
| Composition of solution C | Zn2+ | Mn2+ | Fe3+ |
| Content g/L | 0.0001 | 23.4278 | 0.0000 |
Example 2
A method for recovering valuable metals in chlorine-containing waste liquid comprises the following steps:
(1) at room temperature, firstly pouring 50L of chlorine-containing waste liquid into a 100L stirring tank, starting a stirrer, adding 29.6 mass percent of sodium hydroxide solution while stirring for acid-base neutralization, detecting the pH value of liquid in the stirring tank on line by adopting a Mettler pH meter, and when the pH value of a system reaches 1.0, adding 10.19L of sodium hydroxide;
(2) adding 0.1g of flocculant PAM (polyacrylamide), adding a sodium hydroxide solution, adding 11.13L of the sodium hydroxide solution when the pH value of the system reaches 4.1, standing, filtering the system liquid by using a filter press to obtain iron hydroxide filter residue A and filtrate B, fully filtering to remove water, and measuring that the water content of the filter residue is about 28.5 percent and the weight of the filter residue is 128 g;
(3) conveying the filtrate A to pass through D201 macroporous chelating resin by a peristaltic pump, controlling the column passing speed to be 4.5BV/h, performing adsorption separation of zinc element and manganese element, detecting the content of zinc ions in the solution C at the outlet of the second-stage adsorption resin, and stopping adsorption operation when the content of the zinc ions in the solution C reaches 1 mg/L;
(4) regenerating the D201 macroporous chelate resin with saturated adsorption by using 8% sulfuric acid solution, controlling the flow rate to be 1.5BV/h, detecting that the content of zinc ions in the desorption liquid reaches 10mg/L, finishing the desorption operation, cleaning the residual acid liquid in the resin column by using pure water, detecting the pH value of the oral liquid by using a pH meter, and finishing the resin regeneration operation when the pH value of the outlet cleaning liquid is more than 3;
(5) adding a sodium carbonate solution into the solution C to generate manganese carbonate, recrystallizing, and filtering to obtain manganese carbonate;
(6) adding sodium carbonate solution into the desorption solution to generate zinc carbonate, recrystallizing, and filtering to obtain the zinc carbonate.
Taking the volume of the chlorine-containing waste liquid in the step (1), and measuring the H of the chlorine-containing waste liquid+The concentration is 2.12 mol/L.
Table four: composition of chlorine-containing waste liquid
| Composition of chlorine-containing waste liquid | Zn2+ | Mn2+ | Fe3+ |
| Content g/L | 1.6237 | 28.5752 | 0.9534 |
And (3) detecting the filtrate A in the step (2), wherein the content of metal ions is shown in a table II.
Table five: composition of filtrate A
| Composition of filtrate A | Zn2+ | Mn2+ | Fe3+ |
| Content g/L | 1.3098 | 23.3602 | 0.0000 |
And (4) taking the solution C in the step (3) for detection, wherein the detection result is shown in the third table.
Table six: composition of solution C
| Composition of solution C | Zn2+ | Mn2+ | Fe3+ |
| Content g/L | 0.0001 | 23.3415 | 0.0000 |
Comparative example 1
A method for recovering valuable metals in chlorine-containing waste liquid comprises the following steps:
(1) at room temperature, firstly pouring 50L of chlorine-containing waste liquid into a 100L stirring tank, starting a stirrer, adding 29.6 mass percent of sodium hydroxide solution while stirring for acid-base neutralization, detecting the pH value of liquid in the stirring tank on line by adopting a Mettler pH meter, and measuring that the contents of iron, zinc and manganese in the system are all lower than 1mg/L when the pH value of the system reaches 11.0;
(2) adding 0.1g of flocculant PAM (polyacrylamide), adding a sodium hydroxide solution, adding 20.73L of the sodium hydroxide solution in total, standing, filtering the system liquid by using a filter press to obtain iron hydroxide filter residue A and filtrate B, fully filtering to remove water, and measuring that the water content of the filter residue is about 28% and the weight of the filter residue is 3620 g.
The results of example 1 and comparative example 1 were compared, and the amount of base used and the amount of solid waste produced in example 1 were 58% and 3.6% of comparative example 1, respectively. The treatment scheme of the embodiment 1 has obvious advantages in the aspects of auxiliary material use and waste treatment, and can obviously reduce the treatment cost. In addition, in the embodiment 1, zinc is prepared into high-purity zinc carbonate, manganese is prepared into manganese carbonate or is used for producing a nickel-cobalt-manganese ternary precursor of the battery, and the aim of changing waste into valuable can be fulfilled.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (7)
1. A method for recovering valuable metals in chlorine-containing waste liquid is characterized in that: the method comprises the following steps:
(1) adjusting the pH value of the chlorine-containing waste liquid to 0.8-1.2 by using a sodium hydroxide solution;
(2) adding a flocculating agent into the chlorine-containing waste liquid treated in the step (1), adding a sodium hydroxide solution to adjust the pH of the chlorine-containing waste liquid to 4.1 +/-0.1, standing, and filtering to obtain a filtrate A and a filter residue B;
(3) passing the filtrate A through a macroporous chelate resin column, and performing column chromatography separation to obtain a solution C;
(4) regenerating the macroporous chelating resin by using a sulfuric acid solution to obtain a desorption liquid;
(5) adding a sodium carbonate solution into the solution C for reaction, aging and filtering to obtain manganese carbonate;
(6) adding sodium carbonate solution into desorption solution for reaction, aging and filtering to obtain carbonic acidZinc; zn is contained in the chlorine-containing waste liquid in the step (1)2+1.5-1.7g/L, Mn content2+28.5-30g/L, Fe3+Is 0.9-1.05 g/L.
2. The method of claim 1, wherein: h of the chlorine-containing waste liquid obtained in the step (1)+The concentration is 2.31-2.44 mol/L.
3. The method of claim 1, wherein: the mass percent of the sodium hydroxide solution in the step (1) is 28-32%.
4. The method of claim 1, wherein: and (3) the flocculating agent in the step (2) is polyacrylamide.
5. The method of claim 1, wherein: the flow rate of the column for column chromatography separation in the step (3) is 3-5 BV/h.
6. The method of claim 1, wherein: and (4) the mass percent of the sulfuric acid solution in the step (4) is 5-10%.
7. The method of claim 1, wherein: the flow rate of the column for regenerating the macroporous chelating resin in the step (4) is 1-2 BV/h.
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| CN114272961B (en) * | 2021-12-20 | 2023-10-03 | 江西永兴特钢新能源科技有限公司 | Ion exchange resin regeneration method for removing impurities from lithium sulfate solution |
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| CN101982433B (en) * | 2010-11-09 | 2012-08-01 | 南京大学 | Method for harmless and recycling treatment of stainless steel acid washing waste water neutralization sludge |
| CN102923738A (en) * | 2012-11-15 | 2013-02-13 | 吉首大学 | Method for recovering water soluble manganese and magnesium from electrolytic manganese residue |
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