CN113249589A - Rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment - Google Patents
Rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment Download PDFInfo
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Abstract
The invention discloses a rare and noble metal recovery method capable of improving extraction rate based on electrolytic treatment, and particularly relates to the technical field of rare and noble metal recovery, and the method comprises the following specific steps: the method comprises the following steps: carrying out pretreatment reduction; step two: filtering residual liquid; step three: carrying out electrolytic reaction; step four: sampling and testing; step five: recovering the precipitate; step six: and (6) cleaning. According to the invention, through the arrangement of the first step, the third step and the fifth step, rare and precious metals are leached out by using the chlorination leaching solution for three times, and the chlorination leaching solution is filtered and reduced, so that the rare and precious metals can be recycled, the solution consumption is low, the operation is simple, the reaction speed is high, the leaching effect is good, the method is suitable for various rare and precious metals, the recovery rate is high, through the arrangement of the reducing agent, the precipitation of the rare and precious metals is promoted, the layered separation of the rare and precious metals and the electrolytic waste liquid is facilitated, the improvement of the extraction rate of the rare and precious metals is facilitated, the large addition of a thiosolvent is avoided, the toxicity of the electrolyte is weakened, the recovery processing cost is saved, and the safety is high.
Description
Technical Field
The invention relates to the technical field of rare and precious metal recovery, in particular to a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment.
Background
Rare and noble metals are a general term for rare and noble metals. Mainly refers to eight metals of gold Au, silver Ag, platinum Pt, palladium Pd, strontium Sr, osmium Os, rhodium Rh and ruthenium Ru. Because the content of the metals in the earth crust is rare, the extraction is difficult, but the performance is excellent, the application is wide, the using demand of human beings is continuously increased, the supply and demand are unbalanced, and the daily using demand is met through regeneration, recovery and cyclic utilization.
The traditional pyrometallurgical process is mainly used for extracting rare and precious metals, and has the characteristics of high recovery rate which can reach over 90 percent, strong adaptability to raw materials, long processing flow, many intermediate links, serious metal overstocking and fund accumulation, slow industrial chain fund backflow and influence on economic benefit, and the pyrometallurgical process needs high-temperature incineration, is easy to cause lead volatilization, generates various harmful gases, causes secondary pollution and is not beneficial to environmental protection and is gradually replaced by a wet process.
Disclosure of Invention
Therefore, the invention provides a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment, through the arrangement of the first step, the third step and the fifth step, rare and precious metals are leached out by using a chlorinated leaching solution for three times, and the chlorinated leaching solution is filtered and reduced, so that the rare and precious metals can be recycled, the solution consumption is low, the operation is simple, the reaction speed is high, the leaching effect is good, the method is suitable for various rare and precious metals, the recovery rate is high, through the arrangement of a reducing agent, the precipitation of the rare and precious metals is promoted, the layered separation of the rare and precious metals and electrolytic waste liquid is facilitated, the extraction rate of the rare and precious metals is improved, a large amount of a thioreagent is avoided, the toxicity of an electrolyte is weakened, the recovery processing cost is saved, the safety is high, through the arrangement of the sixth step, the extracted rare and precious metals can be purified, and the direct use of the rare and precious metals treated by the process can be facilitated, can directly meet the production and use requirements of people, has strong practicability and solves the problems of long processing flow and low recovery rate of the pyrometallurgical and all-wet process in the prior art.
In order to achieve the above purpose, the invention provides the following technical scheme: a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment comprises the following specific steps:
the method comprises the following steps: pretreatment reduction: preparing a chloridized leaching solution, placing the chloridized leaching solution into a reaction kettle, and mixing the raw material containing rare noble metals and the chloridized leaching solution according to the weight ratio of 2.3-3.1: 1-1.05, keeping the temperature of the reaction kettle at 5-42 ℃, stirring at 300r/min for 200-32 min, standing for 5-10min after reacting for 17-32min, and performing solid-liquid separation to obtain a primary treated metal material and a chlorinated residual liquid;
step two: filtering residual liquid: standing the chlorination residual liquid for clarification for 15-20min, extracting precipitates for the first time, reacting for 6-10min by using 0.3-0.8mol/L sulfuric acid in a volume ratio of 1:1 to the chlorination residual liquid, extracting the precipitates for the second time, hanging copper anode scrap in the treated chlorination residual liquid, heating steam to 75-83 ℃, and extracting the precipitates for the third time to obtain electrolyte;
step three: and (3) electrolytic reaction: the electrolyte is led into an electrolytic cell, the temperature in the electrolytic cell is heated to 50-70 ℃, and the current density is set to be 700-2The voltage of the tank is set to be 2.3-3.4V, reducing agent is added into the tank, and after metal ion impurities of Cu, Fe, Si, Mg, Ca, Pb and Sn are removed, electrolytic waste liquid and secondary treatment metal materials are obtained;
step four: sampling assay: sampling the electrolytic waste liquid, measuring that the content of rare and precious metals exceeds the standard, and performing secondary treatment and recycling;
step five: and (3) precipitation recovery: adding quantitative sodium cyanide into the electrolytic waste liquid to raise the temperature in the electrolytic bath to 160-180 ℃, adjusting the air pressure to 2.0-2.5MPa, reacting for 55-63min, leading rare and noble metals to form a complex anion with cyanide at high temperature, leaching out the rare and noble metals under the condition of pressurizing and raising the temperature to obtain a metal material for three times of treatment, and leading the leaching rate of the rare and noble metals to reach 94-98%;
step six: cleaning treatment: and collectively placing the primary treatment metal material, the secondary treatment metal material and the tertiary treatment metal material in 93-96% ethanol for soaking and washing for 18-25min, taking out, washing for 2-4 times by using distilled water at 85-100 ℃, taking out, and drying to obtain the finished rare and precious metals.
Further, in the first step, the ratio of the chlorination leaching solution is as follows: 200-380g/L, HCl50-310g/L Au, 0.058-0.125g/L Ag0.062-0.109 g/L Pt0.31-0.45 g/L Pd0.10-0.16 g/L Fe0.0057-0.0084 g/L, 0.00036-0.00127g/L Sb0.00058-0.00097 g/L and 3.05-4.15g/L H.
Furthermore, the electrolytic cell in the third step has the specification of 770 × 960 × 750mm, each cell has 6 cathodes of 370mm × 700mm, the collecting tank and the elevated tank are steel plate tanks, the lining is soft plastic, the electrolyte circulation mode is up and down inlet and outlet, a small vertical stainless steel pump is used for pumping the liquid, and the electrolytic cells are combined in series.
Further, the content of rare noble metal in the fourth step is 55-68 g/L.
Further, sodium cyanide was used in an amount of 2.5 wt% in step five.
Further, the reducing agent in step three is NH3·H2O、H2C2O4 CuSO4And SO2The addition amount of the reducing agent in the electrolyte is 10-350 g/L.
Further, the purity of the rare noble metal product in the sixth step is 95.8-99.9%.
The invention has the following advantages:
1. compared with the prior art, the method has the advantages that the first step, the third step and the fifth step are arranged, rare and noble metals are leached for three times by using the chlorination leaching solution, and the chlorination leaching solution is filtered and reduced, so that the rare and noble metals can be recycled, the solution consumption is low, the operation is simple, the reaction speed is high, the leaching effect is good, the method is suitable for various rare and noble metals, and the recovery rate is high;
2. compared with the prior art, the method has the advantages that the reducing agent is arranged, the precipitation of rare and noble metals is promoted, the layered separation of the rare and noble metals and the electrolytic waste liquid is facilitated, the extraction rate of the rare and noble metals is improved, the large addition of a thioreagent is avoided, the toxicity of the electrolyte is weakened, the recovery and processing cost is saved, and the safety is high;
3. compared with the prior art, the method has the advantages that the extracted rare and precious metals can be purified, the rare and precious metals treated by the method can be directly put into use, the production and use requirements of people can be directly met, and the practicability is high.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment, which comprises the following specific steps:
the method comprises the following steps: pretreatment reduction: preparing chlorinated leachate according to the mixture ratio of Au200g/L, HCl50g/L, Ag0.058g/L, Pt0.062g/L, Pd0.31g/L, Fe0.10g/L, Pb0.0057g/L, Sb0.00036g/L, Bi0.00058g/L and H +3.05g/L, placing the chlorinated leachate into a reaction kettle, and then mixing the raw material containing rare noble metals with the chlorinated leachate according to the ratio of 2.3: 1, keeping the temperature of the reaction kettle at 5 ℃, stirring at 200r/min, standing for 5min after reacting for 17min, and carrying out solid-liquid separation to obtain a primary treated metal material and a chlorinated residual liquid;
step two: filtering residual liquid: standing and clarifying the chlorinated residual liquid for 15min, extracting precipitates for the first time, reacting for 6min by using 0.3mol/L sulfuric acid in a volume ratio of 1:1 to the chlorinated residual liquid, extracting the precipitates for the second time, hanging copper anode scrap in the treated chlorinated residual liquid, heating the treated chlorinated residual liquid to 75 ℃ by using steam, and extracting the precipitates for the third time to obtain electrolyte;
step three: and (3) electrolytic reaction: passing the electrolyte into a cell with a specification of 770 x 960 x 750mm and 6 sheets of 370mm x 700mm per cellThe cathode, the liquid collecting tank and the elevated tank are steel plate tanks lined with soft plastics, the electrolyte circulates in and out from top to bottom, a small vertical stainless steel pump is used for pumping the liquid, the temperature in the tanks is heated to 50 ℃ in the series-combined electrolytic tanks, and the current density is set to 700A/m2The voltage of the electrolytic cell is set to be 2.3V, NH3 & H2O, H2C2O4, CuSO4 and SO2 are mixed to prepare a reducing agent, the reducing agent is added into the electrolytic cell according to the proportion of 10g/L of electrolyte, and after metal ion impurities of Cu, Fe, Si, Mg, Ca, Pb and Sn are removed, electrolytic waste liquid and secondary treatment metal materials are obtained;
step four: sampling assay: sampling the electrolytic waste liquid, measuring the content of rare noble metals to be 55g/L, and needing secondary treatment and recycling;
step five: and (3) precipitation recovery: adding 2.5 wt% of sodium cyanide into the electrolytic waste liquid, heating the temperature in an electrolytic bath to 160 ℃, adjusting the air pressure to 2.0MPa, reacting for 55min, reacting the rare and noble metals with cyanide to form a complex anion at high temperature, and leaching out the rare and noble metals under the conditions of pressurization and temperature rise to obtain a metal material for three times of treatment, wherein the leaching rate of the rare and noble metals reaches 94%;
step six: cleaning treatment: and collectively placing the primary treatment metal material, the secondary treatment metal material and the tertiary treatment metal material in 93 percent ethanol for soaking and washing for 18min, fishing out, washing for 2 times by using distilled water at 85 ℃, fishing out, and drying to obtain a finished product of rare and precious metal with the purity of 95.8 percent.
Example 2:
the invention provides a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment, which comprises the following specific steps:
the method comprises the following steps: pretreatment reduction: preparing chloridized leachate according to the mixture ratio of Au250g/L, HCl200g/L, Ag0.073g/L, Pt0.087g/L, Pd0.37g/L, Fe0.13g/L, Pb0.0071g/L, Sb0.00076g/L, Bi0.00075g/L and H +3.46g/L, placing the chloridized leachate into a reaction kettle, and then mixing the raw material containing rare noble metals with the chloridized leachate according to the ratio of 2.5: 1.02, keeping the temperature of the reaction kettle at 17 ℃, stirring at 250r/min, reacting for 22min, standing for 7min, and carrying out solid-liquid separation to obtain a primary treated metal material and a chlorinated residual liquid;
step two: filtering residual liquid: standing the chlorination residual liquid for clarification for 17min, extracting precipitates for the first time, reacting for 7.9min by using 0.5mol/L sulfuric acid in a volume ratio of 1:1 to the chlorination residual liquid, extracting the precipitates for the second time, hanging copper anode scrap in the treated chlorination residual liquid, heating the chlorination residual liquid to 79 ℃ by using steam, and extracting the precipitates for the third time to obtain electrolyte;
step three: and (3) electrolytic reaction: introducing electrolyte into 770 × 960 × 750mm, 6 cathodes of 370mm × 700mm in each tank, collecting tank and elevated tank as steel plate tank, lining with soft plastic, circulating electrolyte in the form of up-down inlet and outlet, pumping liquid with small vertical stainless steel pump, connecting in series, heating the temperature in the tank to 58 deg.C, and setting current density to 800A/m2Cell voltage was set to 2.6V, NH3·H2O、H2C2O4 CuSO4And SO2Mixing to prepare a reducing agent, adding the reducing agent into the tank according to the proportion of 105g/L of the electrolyte, and removing metal ion impurities of Cu, Fe, Si, Mg, Ca, Pb and Sn to obtain electrolytic waste liquid and secondary treatment metal materials;
step four: sampling assay: sampling the electrolytic waste liquid, measuring the content of rare noble metals to be 60g/L, and performing secondary treatment and recycling;
step five: and (3) precipitation recovery: adding 2.5 wt% of sodium cyanide into the electrolytic waste liquid, raising the temperature in an electrolytic bath to 168 ℃, adjusting the air pressure to 2.2MPa, reacting for 58min, forming a complex anion by rare and noble metals and cyanide at high temperature, leaching out the rare and noble metals under the condition of pressurization and temperature rise to obtain a metal material for three times of treatment, wherein the leaching rate of the rare and noble metals reaches 96%;
step six: cleaning treatment: and collectively placing the primary treatment metal material, the secondary treatment metal material and the tertiary treatment metal material in ethanol with the concentration of 94.5% for soaking and washing for 21min, fishing out, washing for 2 times by using distilled water at 90 ℃, fishing out, and drying to obtain a finished product of rare and precious metal with the purity of 96.7%.
Example 3:
the invention provides a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment, which comprises the following specific steps:
the method comprises the following steps: pretreatment reduction: preparing chlorinated leachate according to the mixture ratio of Au310g/L, HCl220g/L, Ag0.093g/L, Pt0.098g/L, Pd0.39g/L, Fe0.14g/L, Pb0.0071g/L, Sb0.00089g/L, Bi0.00081g/L and H +3.94g/L, placing the chlorinated leachate in a reaction kettle, and then mixing the raw material containing rare noble metals with the chlorinated leachate according to the ratio of 2.8: 1.03, keeping the temperature of the reaction kettle at 30 ℃, stirring at 280r/min, reacting for 28min, standing for 8min, and carrying out solid-liquid separation to obtain a primary treated metal material and a chlorinated residual liquid;
step two: filtering residual liquid: standing and clarifying the chlorinated residual liquid for 18min, extracting precipitates for the first time, reacting for 9min by using 0.6mol/L sulfuric acid in a volume ratio of 1:1 to the chlorinated residual liquid, extracting the precipitates for the second time, hanging copper anode scrap in the treated chlorinated residual liquid, heating the treated chlorinated residual liquid to 79 ℃ by using steam, and extracting the precipitates for the third time to obtain electrolyte;
step three: and (3) electrolytic reaction: introducing electrolyte into 770 × 960 × 750mm, 6 cathodes of 370mm × 700mm in each tank, collecting tank and elevated tank as steel plate tank, lining with soft plastic, circulating electrolyte in the form of up-down inlet and outlet, pumping liquid with small vertical stainless steel pump, connecting in series, heating the temperature in the tank to 63 deg.C, and setting current density to 900A/m2Cell voltage was set to 3.2V, NH3·H2O、H2C2O4 CuSO4And SO2Mixing to prepare a reducing agent, adding the reducing agent into the tank according to the proportion of 290g/L of the electrolyte, and removing metal ion impurities of Cu, Fe, Si, Mg, Ca, Pb and Sn to obtain electrolytic waste liquid and secondary treatment metal materials;
step four: sampling assay: sampling the electrolytic waste liquid, measuring the content of rare and precious metals to be 61g/L, and performing secondary treatment and recovery;
step five: and (3) precipitation recovery: adding 2.5 wt% of sodium cyanide into the electrolytic waste liquid, heating the temperature in an electrolytic bath to 172 ℃, adjusting the air pressure to 2.3MPa, reacting for 60min, reacting the rare and noble metals with cyanide to form a complex anion at high temperature, leaching the rare and noble metals under the condition of pressurization and temperature rise to obtain a metal material for three times of treatment, wherein the leaching rate of the rare and noble metals reaches 96%;
step six: cleaning treatment: and collectively placing the primary treatment metal material, the secondary treatment metal material and the tertiary treatment metal material in 95 percent ethanol for soaking and washing for 22min, fishing out, washing for 3 times by using distilled water at 95 ℃, fishing out, and drying to obtain a finished product of rare and precious metal with the purity of 98.9 percent.
Example 4:
the invention provides a rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment, which comprises the following specific steps:
the method comprises the following steps: pretreatment reduction: preparing chloridized leachate according to the mixture ratio of Au380g/L, HCl310g/L, Ag0.125g/L, Pt0.109g/L, Pd0.45g/L, Fe0.16g/L, Pb0.0084g/L, Sb0.00127g/L, Bi0.00097g/L and H +4.15g/L, placing the chloridized leachate in a reaction kettle, and then mixing the raw material containing rare noble metals with the chloridized leachate according to the ratio of 3.1: 1.05, keeping the temperature of the reaction kettle at 42 ℃, stirring at 300r/min, standing for 10min after reacting for 32min, and carrying out solid-liquid separation to obtain a primary treated metal material and a chlorinated residual liquid;
step two: filtering residual liquid: standing and clarifying the chlorinated residual liquid for 20min, extracting precipitates for the first time, reacting for 10min by using 0.8mol/L sulfuric acid in a volume ratio of 1:1 to the chlorinated residual liquid, extracting the precipitates for the second time, hanging copper anode scrap in the treated chlorinated residual liquid, heating the treated chlorinated residual liquid to 83 ℃ by using steam, and extracting the precipitates for the third time to obtain electrolyte;
step three: and (3) electrolytic reaction: introducing electrolyte into 770 × 960 × 750mm, 6 cathodes of 370mm × 700mm in each tank, collecting tank and elevated tank as steel plate tank, lining with soft plastic, circulating electrolyte in the form of up-down inlet and outlet, pumping liquid with small vertical stainless steel pump, connecting in series, heating the temperature in the tank to 70 deg.C, and setting current density to 1000A/m2Cell voltage was set to 3.4V, NH3·H2O、H2C2O4 CuSO4And SO2Mixing to obtain reducing agent, adding reducing agent into the tank according to the ratio of 350g/L of electrolyte, and removingObtaining electrolytic waste liquid and secondary treatment metal materials after metal ion impurities of Cu, Fe, Si, Mg, Ca, Pb and Sn;
step four: sampling assay: sampling the electrolytic waste liquid, measuring the content of rare noble metals to be 68g/L, and carrying out secondary treatment and recovery;
step five: and (3) precipitation recovery: adding 2.5 wt% of sodium cyanide into the electrolytic waste liquid, heating the temperature in an electrolytic bath to 180 ℃, adjusting the air pressure to 2.5MPa, reacting for 63min, reacting the rare and noble metals with cyanide to form a complex anion at high temperature, and leaching the rare and noble metals under the conditions of pressurization and temperature rise to obtain a metal material for three times of treatment, wherein the leaching rate of the rare and noble metals reaches 98%;
step six: cleaning treatment: and collectively placing the primary treatment metal material, the secondary treatment metal material and the tertiary treatment metal material in 96 percent ethanol for soaking and washing for 25min, fishing out, washing for 4 times by using distilled water at 100 ℃, fishing out, and drying to obtain a finished product of rare and noble metal with the purity of 99.9 percent.
Example 5:
the following data were obtained from examples 1 to 4:
as can be seen from the above table, the rare and precious metal recovery methods based on electrolytic treatment and capable of improving extraction rate in examples 1 to 4 all can improve the recovery rate of rare and precious metals, but the improvement degree of example 4 is the greatest, through the arrangement of the first step, the third step and the fifth step, rare and precious metals are leached for three times by using a chloride leachate, and the chloride leachate is filtered and reduced, so that the chloride leachate can be recycled, the solution consumption is low, the operation is simple, the reaction speed is high, the leaching effect is good, the method is suitable for various rare and precious metals, the recovery rate is high, through the arrangement of a reducing agent, the precipitation of rare and precious metals is promoted, the layered separation of the rare and the electrolytic waste liquid is facilitated, the extraction rate of rare and precious metals is improved, the addition of a large amount of a thionic reagent is avoided, the toxicity of an electrolyte is reduced, the recovery processing cost is saved, the safety is high, and through the arrangement of the sixth step, the extracted rare and precious metals can be separated from the electrolytic waste liquid, the purification is carried out, so that the rare and precious metals treated by the process can be directly put into use, the production and use requirements of people can be directly met, and the practicability is high.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. A rare and precious metal recovery method capable of improving extraction rate based on electrolytic treatment is characterized by comprising the following steps: the method comprises the following specific steps:
the method comprises the following steps: pretreatment reduction: preparing a chloridized leaching solution, placing the chloridized leaching solution into a reaction kettle, and mixing the raw material containing rare noble metals and the chloridized leaching solution according to the weight ratio of 2.3-3.1: 1-1.05, keeping the temperature of the reaction kettle at 5-42 ℃, stirring at 300r/min for 200-32 min, standing for 5-10min after reacting for 17-32min, and performing solid-liquid separation to obtain a primary treated metal material and a chlorinated residual liquid;
step two: filtering residual liquid: standing the chlorination residual liquid for clarification for 15-20min, extracting precipitates for the first time, reacting for 6-10min by using 0.3-0.8mol/L sulfuric acid in a volume ratio of 1:1 to the chlorination residual liquid, extracting the precipitates for the second time, hanging copper anode scrap in the treated chlorination residual liquid, heating steam to 75-83 ℃, and extracting the precipitates for the third time to obtain electrolyte;
step three: and (3) electrolytic reaction: the electrolyte is led into an electrolytic cell, the temperature in the electrolytic cell is heated to 50-70 ℃, and the current density is set to be 700-2The voltage of the tank is set to be 2.3-3.4V, reducing agent is added into the tank, and after metal ion impurities of Cu, Fe, Si, Mg, Ca, Pb and Sn are removed, electrolytic waste liquid and secondary treatment metal materials are obtained;
step four: sampling assay: sampling the electrolytic waste liquid, measuring that the content of rare and precious metals exceeds the standard, and performing secondary treatment and recycling;
step five: and (3) precipitation recovery: adding quantitative sodium cyanide into the electrolytic waste liquid to raise the temperature in the electrolytic bath to 160-180 ℃, adjusting the air pressure to 2.0-2.5MPa, reacting for 55-63min, leading rare and noble metals to form a complex anion with cyanide at high temperature, leaching out the rare and noble metals under the condition of pressurizing and raising the temperature to obtain a metal material for three times of treatment, and leading the leaching rate of the rare and noble metals to reach 94-98%;
step six: cleaning treatment: and collectively placing the primary treatment metal material, the secondary treatment metal material and the tertiary treatment metal material in 93-96% ethanol for soaking and washing for 18-25min, taking out, washing for 2-4 times by using distilled water at 85-100 ℃, taking out, and drying to obtain the finished rare and precious metals.
2. The method for recovering rare noble metals with improved extraction rate based on electrolytic treatment as claimed in claim 1, wherein: in the first step, the proportion of the chlorination leaching solution is as follows: 200-380g/L, HCl50-310g/L Au, 0.058-0.125g/L Ag0.062-0.109 g/L Pt0.31-0.45 g/L Pd0.10-0.16 g/L Fe0.0057-0.0084 g/L, 0.00036-0.00127g/L Sb0.00058-0.00097 g/L and 3.05-4.15g/L H.
3. The method for recovering rare noble metals with improved extraction rate based on electrolytic treatment as claimed in claim 1, wherein: in the third step, the electrolytic bath has 770 × 960 × 750mm, 6 cathodes of 370mm × 700mm are arranged in each bath, the liquid collecting tank and the elevated tank are steel plate tanks, soft plastic is lined, the electrolyte is circulated in a mode of up-down inlet and outlet, a small vertical stainless steel pump is used for pumping the liquid, and the electrolytic baths are combined in series.
4. The method for recovering rare noble metals with improved extraction rate based on electrolytic treatment as claimed in claim 1, wherein: the content of rare noble metal in the fourth step is 55-68 g/L.
5. The method for recovering rare noble metals with improved extraction rate based on electrolytic treatment as claimed in claim 1, wherein: the amount of NaCN in step five was 2.5 wt%.
6. The method for recovering rare noble metals with improved extraction rate based on electrolytic treatment as claimed in claim 1, wherein: the reducing agent in step three is NH3·H2O、H2C2O4CuSO4And SO2The addition amount of the reducing agent in the electrolyte is 10-350 g/L.
7. The method for recovering rare noble metals with improved extraction rate based on electrolytic treatment as claimed in claim 1, wherein: the purity of the rare noble metal obtained in the sixth step is 95.8-99.9%.
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| CN114314884A (en) * | 2022-01-04 | 2022-04-12 | 南宁光波科技有限公司 | Method and device for treating waste electrolyte of cadmium-nickel accumulator |
| CN114540623A (en) * | 2022-01-28 | 2022-05-27 | 佛山汇真科技有限公司 | Intelligent separation and purification system and method for rare and precious metals |
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