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Technology for extracting indium from indium-rich bottom lead

An indium-rich bottom lead and indium-rich technology, applied in the field of metallurgy and chemical industry, can solve the problems of low indium concentration, high power consumption and energy consumption, and harsh working conditions, and achieve short process flow, low production cost and low reagent consumption. small effect

Inactive Publication Date: 2008-12-31
SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY +1
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  • Application Information

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Problems solved by technology

Although this process can achieve better recovery of indium, it also has the disadvantage of a long process. The direct recovery rate of indium is only about 70-75%, and the total recovery rate is only about 85%.
In the oxidation slagging process, the slagging temperature and blast pressure are 800-900°C and 0.15-0.24MPa, respectively, the power consumption and energy consumption are relatively large, and a large amount of expensive caustic soda is also consumed, and the working conditions are harsh
The scum is leached with sulfuric acid, and the leaching rate of indium is only about 85%; if HCl+H 2 SO 4 Mixed acid leaching, and adding KMnO 4 Although the primary leaching rate of oxidant and indium can be increased to more than 90%, the production cost also increases significantly; in addition, due to the low concentration of indium in the leaching solution and the elution of alkali by scum water, the wastewater discharge during the entire process is large. serious environmental pollution

Method used

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  • Technology for extracting indium from indium-rich bottom lead

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 1. The chemical composition is (%): In: 0.357, Pb: 88.89, Zn: 8.75, Cu: 0.006, Fe: 0.0023, As: 0.023, Sb: 0.32, Ge: 0.021, Sn: 0.8, Ag<0.0005 Indium-rich lead was melted and cast into an anode plate of length×width=20cm×12cm.

[0014] 2. With a stainless steel plate as the cathode, the chemical composition is (g / L): Pb 2+ : 83.46, SiF 6 2- : 196.54, In 3+ : Carry out bottom lead electrolysis in the lead fluorosilicate solution of 1.91, the electrolysis process condition of the liquid before electrolysis is: current density 155A m -2 , electrolysis cycle 24h, electrolyte circulation volume 100mL h -1 , the temperature is 25°C, the pole distance is 40mm, and the electrolytic additive is bone glue 0.5kg / t 电铅 , sodium lignosulfonate 0.45kg / t 电铅 . The anode consumes 276.15g, precipitates 285.05g of electric lead containing Pb98.31%, and produces 2.32g of anode slime. Its chemical composition and composition are (%): Pb: 7.73, In: 0.263. The electrolysis rate of indiu...

Embodiment 2

[0017]1 Melt the indium-rich bottom lead with the chemical composition (%): In: 0.888, Pb: 97.33, Zn: 0.98, Cu<0.001, Fe: 0.0026, Sb: 0.44, Ge: 0.018, Sn: 1.19, Ag: 0.00013 And cast the anode plate of length×width=12.5cm×7.2cm.

[0018] 2. With a stainless steel plate as the cathode, the chemical composition is (g / L): Pb 2+ 93.27~103.87, SiF 6 2- 196.54~230.40, In 3+ The "bottom lead electrolysis-electrolyte P 204 Extraction of indium - hydrochloric acid stripping and extraction of indium" operation. The electrolysis process conditions are: current density 155A m -2 , electrolysis cycle 24h, electrolyte circulation volume 100mL h -1 , the temperature is room temperature, the pole distance is 40mm, and the electrolytic additive is bone glue 0.5kg / t 电铅 , sodium lignosulfonate 0.45kg / t 电铅 . The whole process consumes 460.65g of anodes and produces 475.65g of lead containing Pb98.42%. The output of anode slime is 6.35g, and its chemical composition is (%): Pb9.30, In0.37,...

Embodiment 3

[0022] 1. The average chemical composition is (%): In0.31, Pb97.33, Zn1.81, Sb0.31, Sn0.62 indium-rich bottom lead is melted and cast into an anode plate

[0023] 2. With refined lead as the cathode, the chemical composition is (g / L): Pb 2+ 106.01, SiF 6 2- 194.33, In 3+ 0.069, Sn1.16 lead fluorosilicate solution for indium-rich bottom lead electrolysis. Electrolysis process conditions are: current density 193.82A / m 2 , homopolar center distance 90mm, electrolyte temperature 41~43℃, electrolyte circulation speed 15~25L / min, cathode and anode cycle 3d, electrolytic additive is bone glue 0.4kg / t 电铅 , sodium lignosulfonate 0.25kg / t 电铅 . The electrolysis process consumed a total of 74.95t of anodes, and produced 74.53t of lead containing Pb99.99%. The indium electrolysis rate was 95.53%, and the lead precipitation rate and current efficiency were 96.35% and 89.45%, respectively. The chemical composition of the solution after electrolysis is (g / L): Pb 2+ 16.66, SiF 6 2- 2...

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Abstract

The invention relates to a technique of extracting indium from indium-rich bottom lead, which comprises steps as follows: firstly, the indium-rich bottom lead is melt down and cast into an anode plate, while a stainless-steel plate or a refined lead plate is used as a cathode, and electrolysis is conducted in a silicofluoric acid system; secondly, lead is electrolyzed out of the anode and into an electrolyte solution, and electrolytic lead is precipitated from the cathode; thirdly, indium is dissolved along with the lead and retained in the electrolyte solution, from which the indium is extracted with P204, and the indium is re-extracted with hydrochloric acid to obtain an indium-rich re-extracting solution, a pH value thereof is regulated and then sponge indium is obtained through aluminum plate replacement, and rude indium is obtained through conventional pressing and flake caustic casting of the sponge indium. The technique can effectively recover the indium while directly obtaining the electrolytic lead product, and has advantages of high recovery rate of valuable metal, small consumption of reagent and low production cost; and the flow is closed-cycle, environmental friendly and belongs to a cleaning production process.

Description

【Technical field】 [0001] The invention belongs to the field of metallurgy and chemical industry, and relates to a technology for electrolyzing and extracting indium from indium-rich bottom lead. 【Background technique】 [0002] Explanation of the name: P 204 for Di-(2-ethylhexyl) phosphoric acid . Indium, like other scattered elements, has no independent industrial deposits that can be mined. It mainly coexists with minerals such as lead, zinc, copper, and tin, and is the product of comprehensive utilization of resources. In the refining process of these main metals, the associated indium is enriched in different degrees in the products such as smoke dust, smelting waste slag (slag, leaching slag, purification slag, etc.), soot, and indium-containing waste according to different process conditions. Indium raw materials, and then various chemical metallurgical methods to prepare crude indium. [0003] The indium associated with the zinc concentrate enters the crude zinc du...

Claims

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Application Information

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IPC IPC(8): C22B58/00
CPCY02P10/20
Inventor 何静吴斌秀鲁君乐冯开行唐谟堂韩翌赖复兴张鹏左新田王坚刘维陈永明吕伯康杨声海吴成春唐朝波
Owner SHENZHEN ZHONGJIN LINGNAN NONFEMET COMPANY