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Process for comprehensively recovering rare and precious metals including gold, silver, platinum and palladium from gold-bearing wastes

A technology of rare precious metals and scraps, which is applied in the field of comprehensive recovery of gold, silver, platinum, palladium and rare precious metals, can solve problems such as low labor productivity, slow capital turnover, and large environmental pollution, and achieve low environmental pollution, simple process, and high direct recovery rate. Effect

Active Publication Date: 2015-07-08
郴州雄风环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a process for comprehensive recovery of gold, silver, platinum, palladium and rare precious metals from gold-containing waste, and at the same time solve the problems of large environmental pollution, low direct recovery rate, slow capital turnover and low labor productivity in the traditional process

Method used

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  • Process for comprehensively recovering rare and precious metals including gold, silver, platinum and palladium from gold-bearing wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0017] Take 10kg of anode slime, which contains 7.43% bismuth, 9.06% copper, 203.52g / t gold, 1.53% silver, 23.05 g / t platinum and 99.63 g / t palladium.

[0018] (1) Roasting: Roast the anode slime in a horse-boiling furnace at 580°C for 4.5 hours, and then take out the anode slime (9.18kg).

[0019] (2) Bismuth and copper leaching: Add 27kg of water, 4.59kg of sulfuric acid, 1.84kg of sodium chloride, and 0.46kg of sodium chlorate to the roasted anode slime, and leaching at 85°C for 3 hours. After filtration, 27.83 L of copper-bismuth solution and 6.37 kg of filter residue were obtained.

[0020] (3) Recovery of bismuth and copper: Use 2.61kg of caustic soda to adjust the pH of the copper-containing and bismuth-containing solution produced in step (2) to 2.5, and obtain 1.15kg of bismuth oxychloride (62.32% bismuth-containing) and 22.83% copper-containing solution by filtration. L, use 1.68kg of soda ash to adjust the pH of the copper-containing solution to 5.0, filter to obta...

Embodiment approach 2

[0025] Take 5kg of electroplating sludge, which contains 118.63g / t gold, 2.43% silver, 85.68 g / t platinum and 77.32 g / t palladium.

[0026] (1) Roasting: Roast the gold-containing waste in a horse-boiling furnace at 550°C for 4.5 hours, and then take out the gold-containing waste (4.02kg).

[0027] (2) Gold, platinum, and palladium leaching: add 14kg of water, 2.41kg of sulfuric acid, and 1.21kg of sodium chlorate to the filter residue produced in step (1), leaching at 85°C for 5 hours and then adding 14L of water Filtration obtained 13.66 L of gold-containing platinum-palladium solution, which contained 0.021 g / L of gold, 0.015 g / L of platinum, 0.014 g / L of palladium and 1.69 kg of silver-enriched slag (containing 7.18% silver). The silver recovery rate is 99.87%.

[0028] (3) Separation of gold from the gold-containing platinum-palladium solution: add 0.3 kg of soda ash and 2.3 g of anhydrous sodium sulfite to the gold-containing platinum-palladium solution produced by the ...

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Abstract

The invention relates to a process for comprehensively recovering rare and precious metals including gold, silver, platinum and palladium from gold-bearing wastes. The process comprises the steps of leaching copper, bismuth and the like in the gold-bearing wastes by using sulfuric acid, industrial salt and sodium chlorate after roasting the gold-bearing wastes in a rotary kiln, and then, respectively recovering copper and bismuth in a primary leachate by using caustic soda and calcined soda; leaching primary leaching residues by using hydrochloric acid or sulfuric acid or sodium chloride to obtain secondary leaching residues and a solution containing gold, platinum and palladium; enriching silver in the secondary leaching residues; adding calcined soda into the solution containing gold, platinum and palladium to regulate the pH value of the solution, then, adding anhydrous sodium sulfite into the solution, and filtering after settling to obtain sponge gold and a solution containing platinum and palladium; adding zinc powder into the solution containing platinum and palladium, then, settling and filtering to obtain platinum and palladium mud and wastewater; and carrying out conventional extraction on platinum and palladium to obtain platinum powder and palladium powder. By using the process, the problems of serious environment pollution, low direct recovery rate, low-speed capital turnover, low labor productivity and the like in the traditional process can be solved.

Description

technical field [0001] The invention relates to metal comprehensive recovery and smelting technology, in particular to a process for comprehensive recovery of gold, silver, platinum, palladium and rare precious metals from gold-containing waste materials. Background technique [0002] Usually gold-containing scraps are smelted in traditional reverberatory furnaces, adding a large amount of lead to trap the precious metals in the precious lead. After repeated blowing, the precious lead forms crude silver. After the crude silver is electrolyzed, gold, platinum, palladium Precious metals such as silver exist in silver anode slime. This gold-containing waste treatment process requires a large amount of lead as a collector, causing serious environmental pollution, complex procedures, long process, low direct recovery rate, and slow capital turnover. On October 2, 2013, the Chinese Invention Patent Application Publication No. CN103334013A disclosed a novel leaching process for ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 张二军谭雄玉
Owner 郴州雄风环保科技有限公司
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