Process for recovering silver, lead and bismuth from silver-bearing soot comprehensively

A soot and form technology, applied in the process of lead and bismuth, in the field of comprehensive recovery of silver, can solve the problems of low direct silver yield, environmental pollution by flue gas, short process flow, etc., and achieve rapid capital turnover, high recovery rate, and technological Environmentally friendly process

Inactive Publication Date: 2012-02-29
郴州雄风环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a process for comprehensive recovery of silver, lead and bismuth from silver-containing soot, which has a short process flow and solves the problems of low direct silver recovery rate and environmental pollution caused by flue gas in the traditional process.

Method used

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  • Process for recovering silver, lead and bismuth from silver-bearing soot comprehensively
  • Process for recovering silver, lead and bismuth from silver-bearing soot comprehensively

Examples

Experimental program
Comparison scheme
Effect test

experiment approach 1

[0026] (1) Take 500g of silver-containing soot (0.8%-5% silver, 40%-50% lead, 5-10% bismuth, 10%-20% zinc) and heat it with 2L water at 85-95°C and stir for 2-3 hours After filtering, the filtrate is reused; the filter residue (dechlorinated mud) is heated with 250g of sulfuric acid, 35kg of water, and 5g of hydrogen peroxide, and the temperature is controlled at 85-95°C. After stirring for 2-3 hours, the pH of the end point is controlled to be 2.5-3.5, and then filtered;

[0027] (2) Filtrate to obtain 385g of filter residue and 17500mL of filtrate; the filter residue contains 52.1% lead and 10.9% bismuth; add reduced coal and soda ash to the filter residue and melt it in a reverberatory furnace to obtain lead-bismuth alloy. After electrolysis of lead-bismuth alloy Precipitated lead and bismuth-containing anode slime (bismuth-containing greater than 95%) are obtained; bismuth-containing anode slime is fed into the bismuth refining pot in sequence, and then 99.99% of refined bi...

experiment approach 2

[0031] (1) Take 10kg of silver-containing soot (containing 1.36% of silver, 40.1% of lead, 6.9% of bismuth, and 23.4% of zinc) and heat it with 40L of water, stir and wash it for 3 hours, then filter it, and reuse the filtrate; use 5kg of sulfuric acid for the filter residue (dechlorinated mud) , 35kg of water, 500g of hydrogen peroxide, heated (temperature 90°C) and stirred for 3 hours, then filtered;

[0032] (2) Filter to obtain 7.48kg of filter residue and 39000L of filtrate; the filter residue contains 53.2% lead and 9.1% bismuth; add reduced coal and soda ash to the filter residue and enter the reverberatory furnace for smelting to obtain lead-bismuth alloy, lead-bismuth alloy electrolysis Finally, the precipitated lead and bismuth-containing anode slime (bismuth-containing greater than 95%) are obtained; the bismuth-containing anode slime is fed into the bismuth refining pot in sequence, and then 99.99% of refined bismuth can be produced;

[0033] (3) After adding 90g o...

experiment approach 3

[0036] (1) Take 500g of silver-containing soot (containing 1.51% of silver, 40.6% of lead, 8.5% of bismuth, and 20.2% of zinc) with 2L of clean water, heating, stirring and cleaning for 3 hours, then filtering, and reusing the filtrate; filter residue (dechlorinated mud) with 250g of sulfuric acid , 35kg of water, 5g of hydrogen peroxide, heated (temperature 90°C) and stirred for 3 hours, then filtered;

[0037] (2) Filtrate to obtain 385g of filter residue and 17500mL of filtrate; the filter residue contains 52.1% lead and 10.9% bismuth; add reduced coal and soda ash to the filter residue and melt it in a reverberatory furnace to obtain lead-bismuth alloy. After electrolysis of lead-bismuth alloy Precipitated lead and bismuth-containing anode slime (bismuth-containing greater than 95%) are obtained; bismuth-containing anode slime is fed into the bismuth refining pot in sequence, and then 99.99% of refined bismuth can be produced after successively feeding oxygen, zinc ingots, ...

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Abstract

The invention relates to a process for recovering silver, lead and bismuth from silver-bearing soot comprehensively, and belongs to the technical field of comprehensive recovery of noble metals. The process comprises the following steps of: removing chlorine from silver soot by using clear water, and performing acid leaching on the silver in the silver soot by using sulfuric acid and an oxidizing agent; adding sodium chloride into silver-bearing solution to obtain pure silver chloride, and performing the conversion of hydrochloric acid, iron powder metathesis and the washing of acidized purified water on the silver chloride to obtain high-purity sponge silver; after the silver is precipitated, purifying solution, removing impurities and crystallizing to obtain zinc sulfate heptahydrate; and smelting the lead and bismuth which are left in lead bismuth dregs to form a lead bismuth alloy by reverberatory furnace, electrolyzing to obtain precipitated lead and bismuth-bearing anode mud, and refining the bismuth-bearing anode mud and removing impurities to obtain refined bismuth. The process is suitable for processing the silver-bearing soot of which the silver content is over 0.8 percent; and compared with the prior art, the process has the advantages of environment friendliness, silver direct yield of more than or equal to 99.2 percent, high recovery rate, low machining cost and quick capital turnover.

Description

technical field [0001] The invention belongs to the technical field of comprehensive recovery of precious metals, in particular to a process for comprehensive recovery of silver, lead and bismuth from silver-containing soot. Background technique [0002] Usually, the soot with high silver content is fired by fire method, that is, it is roasted in a roasting furnace or smelted into precious lead in a converter or reverberatory furnace. The production process has a high smoke and dust rate, the direct silver recovery rate is not high, and the multiple use of the pyromelting furnace consumes a lot of energy and the flue gas produced does not pollute the environment. [0003] On June 11, 2008, the Chinese Invention Patent Publication No. CNl01195865A disclosed "a method for extracting silver from silver-separating slag" proposed by Jinchuan Group Co., Ltd. This method first slurries the silver-separating slag, and adjusts it with industrial H2S04 The acidity of the solution is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/08C22B3/46C22B11/00C22B13/00C22B30/06
CPCY02P10/20
Inventor 张二军谭雄玉曹孝义戴艳平
Owner 郴州雄风环保科技有限公司
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