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A kind of separation recovery method of gold-tin alloy waste
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A technology of separation and recovery, tin alloy, applied in the direction of improving process efficiency, can solve problems such as affecting gold recovery efficiency, and achieve the effect of comprehensive recovery, simple operation and high recovery rate
Active Publication Date: 2021-04-16
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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Problems solved by technology
[0005] In order to solve the problems and deficiencies in the prior art, the invention provides a method for reclaiming gold-tin alloy waste, especially a method for pretreatment of gold-tin alloy waste that can be used without introducing new Under the premise of removing impurities, solve the problem that the colloidal precipitate formed in the tin dissolution process affects the recovery efficiency of gold, and realize the effective separation and recovery of gold-tin alloy waste
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Embodiment 1
[0035] The following preparation method is used to pretreat the gold-tin alloy waste to prepare a high-tin alloy. The composition and mass percentage of each component are: Sn: 40%, Au: balance (abbreviated as AuSn40).
[0036] The preparation process is as follows:
[0037] a) Material preparation: use lotion to remove oil stains on the surface of gold-tin waste, and purchase tin raw materials; calculate and weigh according to the above-mentioned composition and mass percentage ratio.
[0039] c) Heating up, according to the amount of charge, the power is given to 30-45Kw, and the temperature is raised rapidly;
[0040] d) After the charge is completely melted, let it stand for 3 to 6 minutes;
[0041] f) Heating is stopped, and the molten alloy is poured into water to obtain gold-tin particles with a mesh size of 50 to 100, and the...
Embodiment 2
[0043] The following preparation method is used to pretreat the gold-tin alloy waste to prepare a high-tin alloy. The composition and mass percentage of each component are: Sn: 50%, Au: the balance (abbreviated as AuSn50).
[0044] The preparation process is as follows:
[0045] a) Material preparation: use lotion to remove oil stains on the surface of gold-tin waste, and purchase tin raw materials; calculate and weigh according to the above-mentioned composition and mass percentage ratio.
[0046] b) Use a vacuum granulator to directly obtain gold-tin particles with a mesh size of 50 to 100 according to the alloy characteristics, and put them into an oven to dry for later use.
Embodiment 3
[0048] The AuSn40 high-tin alloy prepared in embodiment 1 realizes the separation and recovery of gold and tin, and the method is as follows:
[0049] a) Dissolution and separation of tin: put AuSn40 particles into a quartzbeaker, add concentrated hydrochloric acid, place on a heating furnace and heat to 80°C, and stir while heating; when the particles in the solution are no longer dissolved, filter;
[0050] b) gold separation: add the filtered insoluble matter into aqua regia to dissolve, and heat to a temperature of 80°C at the same time, until the insoluble matter is completely dissolved, continue heating (80°C) to concentrate and remove the acid, and control the gold content of the solution at 150 g / L;
[0051] c) deep tin separation: add 20w% sodiumhydroxide solution to the above-mentioned solution containing gold ions, adjust the pH value of the solution to 2.5, make the residual tin ions in the solution fully react with the alkali to form tin hydroxide precipitate, an...
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Abstract
The invention relates to a method for separating and recovering gold-tinalloy waste, and belongs to the technical field of nonferrous metalhydrometallurgy. Melt the gold-tinscrap in a melting furnace and add tin to form a high-tin alloy; splash or granulate the molten gold-tin alloy to obtain gold-tin particles; dissolve and separate the gold-tin particles with acid at a certain temperature Most of the tin; add insoluble matter to aqua regia until completely dissolved; add alkali to the above solution to precipitate the residual tin in the solution, and completely remove tin after filtering; reduce the above filtrate with a reducing agent to obtain pure gold. The method of the invention has the characteristics of simple operation, no introduction of new impurities, high recovery rate, comprehensive recovery and utilization of gold and tin, and is beneficial to industrial application. The purity of gold recovered by this method is over 99%, the recovery rate of gold is greater than 99%, and the utilization rate of tin is greater than 99%, which is beneficial to the comprehensive recovery and utilization of gold and tin.
Description
technical field [0001] The invention relates to a method for separating and recovering gold-tin alloy waste, and belongs to the technical field of nonferrous metalhydrometallurgy. Background technique [0002] Gold-tin alloy solder has the advantages of high strength, moderate melting point, good fluidity, oxidation resistance, thermal fatigue resistance and creep resistance, and is widely used in chipwelding and shell packaging of high-reliability microelectronic devices , Circuit hermetic packaging, has broad application prospects in power semiconductor devices, optical fiber communications, mobile communications and other fields. The commonly used gold-tin alloy solder has a high gold content, and the mass percentage of gold in the alloy is as high as 80%. Therefore, the gold-tin alloy waste generated during the preparation and application of gold-tin solder has a high recycling value. [0003] At present, the recycling methods of gold alloy waste mainly include the fo...
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Application Information
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