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Method for comprehensively treating indium-containing lead anode slime through whole wet process

A comprehensive treatment of lead anode slime technology, applied in the direction of improving process efficiency, can solve the problems of low yield, small amount of indium-containing anode slime, high recycling costs, etc., to achieve good economic benefits, more valuable recycled metals, tractable effect

Inactive Publication Date: 2013-02-06
云南天浩稀贵金属股份有限公司
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  • Claims
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Problems solved by technology

[0002] About 15% of the indium in the process of electrolytically extracting indium with indium-containing crude lead remains in the anode slime due to the formation of alloys with other metals. This part of indium has a high recovery value, because the traditional lead anode slime treatment process is Pyrometallurgical smelting is used to produce crude lead, followed by electrolytic extraction. During pyrometallurgy, indium is dispersed in various smelting slags and smoke dust in each smelting stage, which makes the process of recycling indium complex (different slags and slags must be treated separately. Soot), high recovery costs, low yield and other disadvantages, so the anode slime described in the prior art pyroprocessing does not take the recovery of indium as the purpose. In addition, the amount of anode slime containing indium is not large, so it is not suitable for pyroprocessing

Method used

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  • Method for comprehensively treating indium-containing lead anode slime through whole wet process

Examples

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Effect test

Embodiment 1

[0010] Example 1: Put in 5.4kg of indium-containing anode slime, grades: Pb8.04%, In9.32%, Ag9.66%, Sn3.45%, Cu2.08%, Bi20.0%, Sb20.0%. 1) Primary chlorine salt heating leaching, leaching conditions: leaching solution: anode slime = 5:1, reaction temperature 80°C, reaction time 80 minutes, final acid pH 2.5, leaching solution plus soda ash for neutralization, control pH 4.8, neutralization slag is The hydroxide of indium is dissolved in sulfuric acid, and the indium is extracted by the traditional extraction process. After neutralization, the liquid is oxidized and regenerated by chlorine gas, and then used as the pre-chlorine salt leaching liquid at room temperature; : chlorine salt heating leaching residue 5:1, stirring at room temperature, reaction time 180min, final acid 41g / L, leaching solution plus reducing agent replacement to obtain copper bismuth slag, the replacement solution is used as the pre-chlorination salt heating leaching solution, and the leaching residue is 8...

Embodiment 2

[0011] Example 2： Input 2.25t of indium-containing anode slime, grade Pb11.26%, In 9.43%, Sb28.71%, Bi 16.52%, Ag 9.98%, Cu2.62%, 1) primary chlorine salt heating leaching, leaching conditions: leachate: anode Mud=6:1, reaction temperature 85°C, reaction time 90min, final acid controlled at 2.5, leaching solution was neutralized with soda ash, control pH=3.0, leaching solution was neutralized with soda ash, control pH=5.1, neutralization slag was hydrogen of indium Oxide, after dissolving with sulfuric acid, the traditional extraction process extracts indium, and after neutralization, the liquid is passed through chlorine gas to oxidize and regenerate, and then it is used as the pre-chlorine salt leaching solution at room temperature; 6:1, stirring at room temperature, reaction time 180min, final acid control 45g / L, leaching solution plus reducing agent replacement to obtain copper bismuth slag. 3) Add sodium chlorate to oxidize the salt leaching residue before ammonia leachi...

Embodiment 3

[0012] Example 3: Put in 15.0kg of indium-containing anode slime, grade: Pb11.26%, In 9.43%, Sb28.71%, Bi 16.52%, Ag 9.98%, Cu2.62%, 1) primary chlorine salt heating leaching, leaching Conditions: leachate: anode slime = 7:1, reaction temperature 85°C, reaction time 100min, final acid pH 2.5, leachate neutralized with soda ash, control pH = 5.0, neutralized slag is indium hydroxide, dissolved with sulfuric acid Finally, the traditional extraction process extracts indium, and the neutralized liquid is passed through chlorine gas to oxidize and regenerate as the pre-chlorine salt leaching solution at room temperature; 2) Secondary chlorine salt leaching at room temperature (leach solution oxidation potential 0.75V) leach solution: chlorine salt heating leaching residue 7:1 , stirring at room temperature, reaction time 180min, final acid 35g / L, leaching solution plus reducing agent replacement to obtain copper bismuth slag, the replacement solution is used as the chlorine salt hea...

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Abstract

A method for comprehensively treating indium-containing lead anode slime through the whole wet process relates to adoption of the whole wet extraction technology for extracting valuable metals such as indium, silver, lead, copper and bismuth, and belongs to the technical field of non-ferrous metal metallurgy. The method comprises the following steps: (1) adding a chloride solution into anode slime, leaching for the first time at the temperature higher than 80 DEG C, and controlling the final pH value within 2.5-3.0; (2) neutralizing the first leaching solution until the pH value reaches 4.8-5.1, precipitating, then adding sulfuric acid into dregs for dissolution, and extracting to obtain crude indium; (3) oxidizing and chloridizing the neutralized solution of precipitated indium, then leaching the first leached dregs for the second time, and controlling the final acidity within 45-30g / L; (4) the secondary leached dregs are leached at the temperature higher than 90 DEG C, neutralizing the leaching solution for lead precipitation, oxidation leaching the leached dregs, adding ammonia water for leaching, and reducing the ammonia leaching solution by hydrazine hydrate, thereby obtaining silver sponge; and (5) reduction replacing the secondary leaching solution to obtain the valuable metals. The method is low in cost, has higher extraction ratio for the valuable metals, can be used for easily separating the valuable metals, is free from waste liquor and waste residues, and has better economic benefits.

Description

technical field [0001] The invention relates to a nonferrous metal hydrometallurgy comprehensive recovery technology, in particular to extracting indium, silver, lead, copper, bismuth and other valuable metals from anode slime containing indium and lead by using a full wet extraction technology, and belongs to the technical field of nonferrous metal smelting. Background technique [0002] About 15% of the indium in the process of electrolytically extracting indium from crude lead containing indium is left in the anode slime due to the formation of alloys with other metals. This part of indium has a high recovery value, because the traditional lead anode slime treatment process is Pyrometallurgical smelting is used to produce crude lead, followed by electrolytic extraction. During pyrometallurgy, indium is dispersed in various smelting slags and smoke dust in each smelting stage, which makes the process of recycling indium complex (different slags and slags must be treated sep...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/04C22B3/20C22B11/00C22B13/00C22B15/00C22B25/00C22B30/02C22B30/06C22B58/00
CPCY02P10/20
Inventor 孙浩然
Owner 云南天浩稀贵金属股份有限公司
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