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Method of recycling silver-containing soldering tin slag

A recycling method and tin slag technology, which is applied in the field of metallurgy and chemical industry, can solve problems such as low economic value and environmental pollution, and achieve the effects of increased economic benefits, high metal recovery rate, and no secondary pollution

Active Publication Date: 2014-09-17
YANGZHOU NINGDA NOBLE METAL CO LTD
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  • Abstract
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Problems solved by technology

[0003] The above-mentioned solder slag is re-melted in a tin pot and then sold to professional manufacturers to regenerate solder. This is a more commonly used method at present, but the economic value is not high, and it is easy to cause environmental pollution.

Method used

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  • Method of recycling silver-containing soldering tin slag

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Embodiment Construction

[0025] The operation steps include: high-pressure alkali oxidation leaching, solid-liquid separation, purification and impurity removal, concentrated crystallization, precious slag and silver separation.

[0026] 1. High-pressure alkali oxidation leaching: Put the solder slag containing Sn55-63%, Pb30-36%, Ag0.1-0.2% into the autoclave, and add the impregnation solution composed of sodium hydroxide, sodium nitrate and water at the same time, Control the mass ratio of solder slag to sodium hydroxide and sodium nitrate to be 1:0.75~0.8:0.15, and the liquid-solid ratio is 8~10:1. After the feeding is completed, open the air inlet, fill in oxygen, adjust the pressure in the kettle to 1.8-2.0MPa, then close the air inlet valve, and heat up while stirring. The reaction process maintains the temperature in the kettle at 150-180°C and the pressure at 1.8-2.0 MPa, keep stirring for 1-2 hours to complete the leaching, then cool and discharge.

[0027] The chemical reaction formula of t...

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Abstract

The invention relates to a method of recycling silver-containing soldering tin slag and belongs to the technical field of metallurgy and chemical engineering. The method comprises the steps of carrying out high pressure alkaline oxidation leaching and solid-liquid separation, purifying to remove impurities, concentrating and crystallizing, separating silver from expensive slag and the like. Due to the adoption of the method, industrial-grade sodium stannate, lead slag sulfide and silver ingot products are respectively recovered and the method has the advantages of high metal recovery rate, good economic benefits, no secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chemical industry, and in particular relates to the recovery technology of silver-containing solder slag. Background technique [0002] Waste circuit boards contain a large amount of solder, which has valuable recycling value. According to research, solder accounts for about 4% of waste circuit boards. The separation and recycling of solder can also create new opportunities for recycling other resources of waste circuit boards. good condition. The solder slag separated and recovered from waste circuit boards is roughly composed of Sn55-63%, Pb30-36%, Ag0.1-0.2%, and other trace metal components include antimony and copper. Most of the tin, lead, and silver in the solder slag exist in the form of metal, and a small part is oxide. [0003] The above-mentioned solder slag is re-melted in a tin pot and then sold to professional manufacturers to regenerate solder. This is a more commonly used ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B25/06
CPCY02P10/20
Inventor 岳喜龙樊飞樊红杰汪洋
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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