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Method for recovering gold, silver, tin and copper from industrial wastes

A technology for recovering gold from industrial waste, which is applied in silver, tin, copper, and gold recovery from industrial waste, can solve the problems of unsuitability for long-term and large-scale use, waste of social resources, low recovery efficiency, etc., and achieve investment cost and operating cost Low, economic benefits of energy saving and emission reduction, high recovery rate and enrichment rate

Inactive Publication Date: 2013-09-18
NANKANG HENGYUAN CYCLE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the electronics industry and related fields, and people's increasingly high quality requirements for electronic products, electronic products have filled every corner of life. During the production process of these electronic products, a large number of Metal waste mainly contains gold, silver, copper, tin and other metal elements. If it is not recycled, it will cause a lot of waste of social resources, and people's rapid replacement of electronic products has also brought a lot of second-hand resources. These The resource also includes a large amount of metal scrap, and currently, there is no efficient solution for the recovery of these metals
Among these methods, either the recovery efficiency is low, or the process is complicated, it is not suitable for industrialization, or the cost is too high, so it is not suitable for long-term and large-scale use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Take the tin anode slime just out of the tank from the factory (metal content: Au25g / T, Ag2200g / T, Sn46.2%, Cu18.5%), first use a ball mill to grind the anode slime to less than 80 mesh, take 1000g of it and use it to configure A good 5mol / L hydrochloric acid solution 4950mL and hydrogen peroxide 50mL were subjected to oxidative acid leaching treatment, reacted under stirring, the reaction time was 5 hours, the reaction temperature was 90°C, the liquid-solid ratio was 5:1, and the liquid potential after leaching was controlled to 400mv. After the reaction was completed, it was filtered, and the dried weight of the filter residue was 44.7g. After analysis, the contents of each metal were Au561g / T, Ag47300g / T, tin 18.2%, and copper 8.6%. The gold slag rate is close to 100%, and the silver slag rate is 96.1%. Cool the filtrate to room temperature, add 500g of reduced iron powder, stir until the solution no longer discolors the bright tin bars, and filter to obtain sponge c...

Embodiment 2

[0042] Take the tin anode slime just out of the tank from the factory (metal content: Au25g / T, Ag2200g / T, Sn46.2%, Cu18.5%), first use a ball mill to grind the anode slime to less than 80 mesh, take 1000g of it and use 7mol / L regenerated hydrochloric acid solution 4950mL and hydrogen peroxide 50mL were subjected to oxidative acid leaching treatment, reacted under stirring, the reaction time was 3 hours, the reaction temperature was 50°C, the liquid-solid ratio was 5:1, and the liquid potential after leaching was controlled to 450mv. After the reaction was completed, it was filtered, and the dried weight of the filter residue was 108.4g. The analyzed content was Au229g / T, Ag19550g / T, Sn22.3%, Cu9.8%. The gold slag rate is close to 100%, and the silver slag rate is 96.3%. Cool the filtrate to room temperature, add 500g of iron filings, stir until the solution no longer discolors the bright tin bars, and filter to obtain sponge copper. The dry weight of sponge copper is 408.9g, ...

Embodiment 3

[0044] Take 1000g of polishing ash from a factory (the main components are tin-copper alloy and quartz sand, containing 32.6% tin and 8.4% copper), and use a prepared 6mol / L hydrochloric acid solution to carry out oxidative acid leaching treatment on it, and react under stirring. The time is 2 hours, the reaction temperature is 90° C., the liquid-solid ratio is 8:1, the amount of iron trioxide added is 80 g, and the liquid potential after leaching is controlled to be 500 mv. After the reaction was completed, it was filtered, and the dried weight of the filter residue was 534.3g, and the analyzed content was 2.3% Sn and 0.2% Cu. Cool the filtrate to room temperature, add 100g of reduced iron powder, stir until the solution no longer discolors the bright tin bars, and filter to obtain sponge copper. The dry weight of sponge copper is 89.2g, the copper content is 91.2%, and the copper yield is 96.8%. The solution after the copper replacement is adjusted to pH 4 with calcium hydro...

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Abstract

The invention provides a method for recovering gold, silver, tin and copper from industrial wastes. The method comprises the following steps of: (a) adding the industrial wastes in hydrochloric acid solution, adding an oxidant, and performing oxidation acid-leaching treatment to obtain leaching slag, and solution containing tin ions and copper ions; (b) treating the leaching slag to obtain gold and silver; (c) adding iron in the solution containing tin ions and copper ions, and reacting to obtain copper, and a solution containing tin ions and ferrous ions; (d) adding lime in the solution containing tin ions and ferrous ions, and reacting to obtain tin, and solution containing ferrous ions; (e) heating the solution containing ferrous ions, charging air and adding lime, and reacting to obtain goethite and calcium chloride solution; (f) adding concentrated sulphuric acid in the calcium chloride solution to obtain calcium sulphate precipitate and hydrochloric acid solution. The various steps of the method disclosed by the invention are effectively coordinated; zero-discharge in production can be realized; precious metals are efficiently separated, and valent by-products of iron mine and gypsum are obtained; the method has good application prospect.

Description

technical field [0001] The invention relates to the field of metal recovery, more particularly to a method for recovering gold, silver, tin and copper from industrial waste. Background technique [0002] With the rapid development of the electronics industry and related fields, and people's increasingly high quality requirements for electronic products, electronic products have filled every corner of life. During the production process of these electronic products, a large number of Metal waste mainly contains gold, silver, copper, tin and other metal elements. If it is not recycled, it will cause a lot of waste of social resources, and people's rapid replacement of electronic products has also brought a lot of second-hand resources. These The resource also includes a large amount of metal scrap, for which there are currently no efficient solutions for the recovery of these metals. Among these methods, either the recovery efficiency is low, or the process is complicated, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/10C22B3/44C22B3/46C22B11/00C22B15/00C22B25/00
CPCY02P10/20
Inventor 邱志燕杨勇
Owner NANKANG HENGYUAN CYCLE TECH CO LTD
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