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Method for separating valuable metals from lead anode mud

A technology for lead anode slime and valuable metals, which is applied in the field of separating valuable metals from lead anode slime, can solve the problems of low direct recovery rate and impact on copper recovery rate, and achieve simple process, high recovery rate and low temperature Effect

Inactive Publication Date: 2010-08-11
ZHUZHOU SMELTER GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The all-wet process for treating lead anode slime requires less investment than the fire process, and causes less environmental pollution during production. However, because this method uses hydrochloric acid for high-temperature leaching, a large amount of lead chloride will be formed during leaching, and lead chloride is at 90 ° C. The solubility in the above aqueous solution is more than 50g / l, and a small amount of gold and silver will also enter the leaching solution at high temperature and high acid, resulting in a low yield of gold, silver and lead when this method is used to treat lead anode slime
In addition, the leaching rate of lead anode slime copper by this method is only about 80%, which affects the recovery rate of copper

Method used

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Experimental program
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Effect test

Embodiment 1

[0037] In the acid leaching step, the main components (w%) of lead anode slime are: Pb 15.39, Au 0.0025, Ag 2.90, Sb34.50, Bi3.45, Cu3.82, As 8.88, and the rest are acid radical ions and a small amount of other metals ion. Leach with hydrochloric acid with a concentration of 5N, the liquid-solid ratio between the volume of the leachate and the dry weight of the anode slime is 6:1; the leaching temperature is 70°C, the leaching time is 4h, and the oxidant MnO 2 The amount of addition is 5% of the dry weight of lead anode slime. After leaching, it is cooled to 50°C and filtered to obtain a filtrate containing Sb, Bi, Cu and a filter residue containing Au, Ag, and Pb. The filter residue is sent to recover lead and precious metals , filtrate, slag metering, after sampling and testing, calculated lead, gold, silver into precious lead rate are all above 99%, Bi, Sb leaching rate is more than 99%, Cu leaching rate is 96.81%.

[0038] The hydrolysis antimony precipitation step is to ...

Embodiment 2

[0041] Acidic leaching uses HCl with a concentration of 3mol / L+H with a concentration of 1mol / L 2 SO 4 , mixed as leaching solution, leaching temperature 65°C, leaching time 5h, oxidant MnO 2 The amount used is 10% of the dry weight of the anode slime, the leaching rate of Cu into the filtrate is 95%, and the antimony is hydrolyzed and the Na 2 CO 3 Until the free acid of the solution is 2.0N, keep it unchanged for 0.5h, filter, hydrolyze the precipitated bismuth and add Na 2 CO 3 To solution pH value is 4.5, all the other are with example 1.

Embodiment 3

[0043] Acidic leaching uses HCl with a concentration of 4mol / L as the leaching solution, the leaching temperature is 75°C, the leaching time is 3h, and the oxidant MnO 2 The dosage is 8% of the dry weight of the anode slime, the leaching rate of Cu into the filtrate is 95%, and the antimony is hydrolyzed and NaHCO is added 3 Until the free acid of the solution is 1.5N, keep it unchanged for 0.5h, filter, hydrolyze the precipitated bismuth and add NaHCO 3 To solution pH value is 4.0, all the other are with example 1.

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Abstract

The invention discloses a method for separating valuable metals from lead anode mud, aiming to provide a new method for separating valuable metals in lead anode mud by using a wet method. The invention is characterized in that the purpose of more thoroughly separating the valuable metals in the lead anode mud is achieved through several steps of acid leaching, hydrolyzing to deposit antimony, hydrolyzing to deposit bismuth, vulcanizing to deposit copper and concentrating to crystallize. Meanwhile, compared with the traditional method, the method has simple flow, small environmental pollution and high metal recovery rate. The invention is mainly used for non-ferrous enterprises to separate the valuable metals from the lead anode mud.

Description

technical field [0001] The invention relates to a method for separating valuable metals, in particular to a method for separating valuable metals from lead anode slime. Background technique [0002] The anode slime produced in the electrolytic refining process of lead contains gold, silver, arsenic, antimony, bismuth, tellurium, copper and other valuable metal substances. The lead anode slime must be treated to recover the valuable metals. [0003] The lead anode slime is treated by the pyrotechnic process, and the lead content in the obtained antimony dust is as high as 2-5%, and the silver content is 500-1000g / t, which not only affects the recovery rate of lead and silver, but also cannot obtain No. Antimony: The grade of bismuth slag obtained by the pyrotechnic process is 20-30% low and contains high lead, antimony and silver. When bismuth is refined, a silver removal process must be added. The time for lead removal is long, the amount of chlorine gas is large, and the op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/06C22B30/02C22B30/06C22B15/00C01D3/04
CPCY02P10/20
Inventor 陈雪云刘一宁唐爱勇
Owner ZHUZHOU SMELTER GRP
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