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Method for comprehensively recovering valuable metals from copper anode sludge silver separating slag

A copper anode slime and valuable metal technology, applied in the direction of improving process efficiency, can solve problems such as difficulty in comprehensive recovery of valuable metals, and achieve the effects of efficient recovery, high metal recovery rate and simple process

Inactive Publication Date: 2014-08-06
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different from the silver slag of copper anode slime for circuit boards, the silver slag of anode slime obtained from copper sulfide ore or miscellaneous copper smelting process contains about 30% barium in addition to more lead, silver and tin. Barium exists in the form of barium, which wraps a large amount of valuable metals such as tin and silver, which brings great difficulties to the comprehensive recovery of valuable metals from silver slag

Method used

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  • Method for comprehensively recovering valuable metals from copper anode sludge silver separating slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The main components of the silver separating slag are (%) by weight percentage: Pb16.0, Ag1.86, Sn7.5, Ba31.97.

[0022] Add 750 ml of concentrated sulfuric acid to 500 g of silver-separating slag, and leach for 15 minutes at 350° C. to obtain hot acid leaching solution and hot acid leaching slag.

[0023] The hot acid leaching solution is diluted with 150ml of water, and the diluted solution and precipitate are obtained by filtration; the diluted solution is returned to the copper anode slime pretreatment process, and the precipitate is dissolved with 350ml of 16mol / L nitric acid, and the barium sulfate precipitate and silver nitrate solution are obtained by filtration, and the barium sulfate precipitate is dried. It weighs 263.4g, contains 98.5% barium sulfate, and has a barium recovery rate of 95.5%. The silver nitrate solution is reduced with hydrazine hydrate three times the theoretical value to obtain 8.63g of silver powder, with a purity of 99.5% and a silver reco...

Embodiment 2

[0026] The main components of the silver separating slag are (%) by weight percentage: Pb11.5, Ag5.55, Sn8.5, Ba28.85.

[0027] Add 1000ml of concentrated sulfuric acid to 500g of silver-separating slag, and leaching at 250°C for 25 minutes to obtain hot acid leaching solution and hot acid leaching slag.

[0028] The hot acid leaching solution is diluted with 350ml of water, and the diluted solution and precipitate are obtained by filtration; the diluted solution is returned to the copper anode slime pretreatment process, and the precipitate is dissolved in 500ml of 16mol / L nitric acid, and the barium sulfate precipitate and silver nitrate solution are obtained by filtration, and the barium sulfate precipitate is dried. It weighs 240.5g, contains 98.9% barium sulfate, and has a barium recovery rate of 97.0%. The silver nitrate solution is reduced with hydrazine hydrate 1.5 times the theoretical value to obtain 26.54g of silver powder, with a purity of 99.1% and a silver recover...

Embodiment 3

[0031] The main components of the silver separating slag are (%) by weight percentage: Pb9.78, Ag7.13, Sn10.5, Ba24.95.

[0032] Add 900ml of concentrated sulfuric acid to 500g of silver-separating slag, and leaching at 400°C for 10 minutes to obtain hot acid leaching solution and hot acid leaching slag.

[0033] The hot acid leaching solution is diluted with 300ml of water, and the diluted solution and precipitate are obtained by filtration; the diluted solution is returned to the copper anode slime pretreatment process, and the precipitate is dissolved with 300ml of 16mol / L nitric acid, and the barium sulfate precipitate and silver nitrate solution are obtained by filtration, and the barium sulfate precipitate is dried. It weighs 210.9g, contains 98.7% barium sulfate, and has a barium recovery rate of 98.2%. The silver nitrate solution is reduced with hydrazine hydrate twice the theoretical value to obtain 34.18g of silver powder, with a purity of 99.2% and a silver recovery ...

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Abstract

The invention relates to a copper anode sludge silver separating slag reutilization technique, particularly a method for comprehensively recovering valuable metals from copper anode sludge silver separating slag. The method comprises the following steps: carrying out hot acid leaching on silver separating slag, filtering to obtain a hot acid leaching solution containing silver and barium and hot acid leaching slag containing tin and lead; diluting the hot acid leaching solution with water, filtering to obtain a precipitate, dissolving the precipitate with nitric acid, and filtering to obtain a barium sulfate precipitate and a silver nitrate solution; reducing the solution to obtain silver powder; leaching the hot acid leaching slag with acidic chlorine salt, filtering to obtain a chlorine salt leaching solution and chlorine salt leaching slag; cooling the chlorine salt leaching solution to crystallize and precipitate lead chloride; and carrying out alkali fusion, water immersion and evaporation crystallization on the chlorine salt leaching slag to obtain sodium stannate. The method can effectively recover all the valuable metals with higher content in the silver separating slag, and the recovery rates of the lead, silver, tin and barium are respectively up to higher than 97%, 92%, 90% and 95%. The method has the characteristics of simple technique, no emission of three wastes, high metal recovery rate and the like, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a recycling technology for separating silver slag from copper anode slime, in particular to a method for comprehensively recovering valuable metals from copper anode slime separating silver slag. Background technique [0002] Silver separation slag is the residue after extracting precious metals gold, silver, platinum, palladium and copper, selenium, tellurium and other valuable metals from copper anode slime. The main components are tin, lead, barium, silver, a small amount of gold and a small amount of platinum , palladium, has high comprehensive recycling value. [0003] At present, there are not many studies on the recovery and utilization of valuable metals in the silver slag, and most smelters return the silver slag to the pyromelting furnace (application number: 200810049459.5), which increases the charge treatment, and tin and lead cannot be recycled openly. Continuous accumulation may affect the operation of copper el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B25/06C22B13/00C22B11/00C22B26/20
CPCY02P10/20
Inventor 汪金良卢宏
Owner JIANGXI UNIV OF SCI & TECH
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