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Method for recycling valuable metal in silver residue by using full-wet method

A technology for separating valuable metals and silver slag, which is applied in the field of full wet recovery of valuable metals in silver slag, can solve the problems of difficult separation, extraction, low recovery rate of valuable metals, low metal recovery rate, etc., and achieve high efficiency The effect of recycling

Active Publication Date: 2016-08-24
JIANGXI COPPER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the wet processes for treating silver separation slag mainly include chlorate leaching gold, thiosulfate leaching silver, sodium nitrate silver separation, acid leaching extraction of Sb, Bi, etc. Metal recovery, but the separation and extraction of tin and lead has not been realized, and there are problems of low metal recovery rate and long process flow
The main components of silver separation slag are barium sulfate (45~60%), lead sulfate (20~35%), tin dioxide (~15%) and a small amount (~5%) of valuable metals such as Au, Ag, Sb, etc. Among them, the chemical properties of barium sulfate and tin dioxide are stable and insoluble in acid and alkali. Traditional wet process is difficult to separate and extract. Barium sulfate and tin dioxide will wrap Au, Ag, etc. to a certain extent, resulting in valuable Metal recovery rate is low

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  • Method for recycling valuable metal in silver residue by using full-wet method

Examples

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Effect test

example 1

[0028] Take 1.0kg of silver slag as raw material, control the liquid-solid ratio to 8:1, add 110g / L NaOH solution, react at 70°C for 2.0h, filter and separate after the reaction to obtain lead-free slag and lead-containing liquid, lead-containing Sodium sulfide is added to the solution to generate lead sulfide, and the recovery rate of lead is 87.3%. Polymaleic anhydride solution with a concentration of 50g / L is added to the lead removal slag, and the reaction pH is 11.0, the reaction temperature is 70°C, and the liquid-solid ratio is 100. : 1, the reaction time is 6.0h, the stirring speed is 100 rev / min, and the leaching rate of barium reaches 93.8%. Wherein the barium-containing liquid is added sulfuric acid, and the pH of the barium-containing liquid is controlled to be 5.0 to prepare BaSO 4 After barium precipitation, add liquid caustic soda to adjust the pH to 11.0 to regenerate the barium removal agent. The barium removal slag was treated by gold chloride separation and...

example 2

[0030] Take 1.0kg of silver slag as raw material, control the liquid-solid ratio to 8:1, add 125g / L NaOH solution, react at 60°C for 3.0h, filter and separate after the reaction to obtain lead-free slag and lead-containing liquid, lead-containing Sodium carbonate is added into the solution to generate lead carbonate, and the recovery rate of lead is 88.4%; the methacrylic acid solution that concentration is 50g / L is added in the lead removal slag, and the reaction pH is 12.0, and the reaction temperature is 70°C, and the liquid-solid ratio is 80: 1. The reaction time is 5.0h, the stirring speed is 120 rpm, and the leaching rate of barium reaches 94.1%. Wherein the barium-containing solution is added with sulfuric acid, and the pH of the barium-containing solution is controlled to be 4.0 to prepare BaSO 4 After barium precipitation, add liquid caustic soda to adjust the pH to 12.0 to regenerate the barium removal agent. The barium removal slag was treated by gold chloride sepa...

example 3

[0032] Take 1.0kg of silver slag as raw material, control the liquid-solid ratio to 8:1, add 155g / L NaOH solution, react at 55°C for 4.0h, filter and separate after the reaction to obtain lead-free slag and lead-containing liquid, lead-containing Sulfuric acid is added to the solution to generate lead sulfate, and the recovery rate of lead is 90.6%; the polyepoxysuccinic acid solution with a concentration of 150g / L is added to the lead removal slag, the reaction pH is 13.0, the reaction temperature is 70°C, and the liquid-solid ratio is 80: 1. The reaction time is 5.0h, the stirring speed is 200 rpm, and the leaching rate of barium reaches 92.5%. Wherein the barium-containing liquid is added sulfuric acid, and the pH of the barium-containing liquid is controlled to be 2.0 to prepare BaSO 4 After barium precipitation, add liquid caustic soda to adjust the pH to 13.0 to regenerate the barium removal agent. The barium removal slag was treated by gold chloride separation and silv...

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Abstract

The invention provides a method for recycling valuable metal in silver residues by using a full-wet method, and relates to the technical field of non-ferrous metallurgy. The method mainly comprises the following steps: (1) performing alkaline leaching lead removal on separated silver residues, filtering, separating so as to obtain deleading sludge and a lead-containing liquid, and recycling lead from the lead-containing liquid; (2) adding a barium removing agent into the deleading sludge so as to selectively leach out barium, filtering, separating so as to obtain barium removing residues and a barium-containing liquid, recycling the barium-containing liquid, and regenerating the barium removing agent; (3) treating by using chlorination parting and sodium nitrite silver separating processes on the barium removing residues, so as to recycle the precious metal silver; (4) recycling tin from SnO2 enrichment as tin concentrate. The method has the characteristic that metals such as lead, tin, barium, gold and silver are effectively recycled from the separated silver residues.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, and in particular relates to a method for fully wet recovery of valuable metals in silver-separating slag. Background technique [0002] Silver separation slag is the main by-product of copper anode slime treatment. It contains Au, Ag, Sn, Pb, Ba and other valuable metal resources. Today, the mineral resources are becoming increasingly depleted, and the environmental protection, comprehensive utilization of resources, and economic benefits are the largest It is of great significance to study the separation of silver slag from anode slime as a secondary resource, and to explore and develop an environmentally friendly, efficient and economical comprehensive utilization process. [0003] At present, the wet processes for treating silver separation slag mainly include chlorate leaching gold, thiosulfate leaching silver, sodium nitrate silver separation, acid leaching extraction of...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00C22B26/20C22B11/00C22B25/06
CPCC22B7/006C22B7/008C22B11/042C22B13/045C22B25/06C22B26/20Y02P10/20
Inventor 王日汪秋雨黄绍勇胡意文欧阳辉何强韩亚丽吕喜聪孙敬韬
Owner JIANGXI COPPER CORP