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Method for extracting gold from gold mine tailings

A technology of gold mine tailings and gold, which is applied in the field of extracting gold from gold mine tailings, can solve the problems of water resources and environmental pollution, and achieve the effects of less equipment investment, high leaching rate, and high degree of resource utilization

Inactive Publication Date: 2011-04-27
宾丽萍
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the extraction of gold from gold mine tailings generally adopts the cyanide method to extract the residual tailings. This method uses cyanide as the leaching agent, and the toxic solution of cyanide solution is often discharged, which seriously pollutes water resources and the environment.

Method used

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Embodiment

[0023] The present embodiment provides a method for extracting gold from gold mine tailings, comprising the following steps:

[0024] 1. Tailings pretreatment: mix the gold ore tailings and sodium hydroxide evenly and then heat, SiO 2 React with sodium hydroxide to form sodium silicate, add deionized water to dissolve, dissolve sodium silicate in water, filter to obtain filter residue, wash the filter residue with deionized water, dry in an oven, and grind into powder to obtain gold-containing material. For the filter paper used in the process of washing slag, considering that a small amount of tailings adhering to the filter paper may contain gold, it is dried and placed in a muffle furnace for high-temperature ashing, and then mixed with filter residue for the next step.

[0025] 2. Soak filter residue

[0026] (1) Measure 2L of purified water, 600ml of sodium hypochlorite solution, 400ml of hydrochloric acid, weigh 600g of sodium chloride, and mix thoroughly.

[0027] (2)...

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PUM

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Abstract

The invention provides a method for extracting gold from gold mine tailings, comprising the following steps of: (1) preprocessing the tailings to obtain a gold-containing material; (2) putting the gold-containing material into a dissolving slot containing a solution A, constantly stirring under a normal temperature and a normal pressure, and then soaking for 8-20 h to obtain a leaching solution; (3) carrying out adsorption reduction: regulating the pH value of the leaching solution to 2-4, then carrying out heat-insulation reaction to the leaching solution and an adsorbing material in a water bath of 50 DEG C, constantly stirring, adsorbing for 4-12 h and then filtering and drying to obtain gold-adsorbing fibers; and (4) heating and ashing the dried gold-adsorbing fibers at 780 DEG C to obtain the gold. In the method, because the tailings are used as raw materials, the tailings are recycled, and the utilization of resources is improved; and the process for extracting the gold in the invention has the advantages of simplicity, less equipment investment, low cost, short production period, high extracting rate and better economic and environmental-protection benefits.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical industry, in particular to the recovery of gold mine tailings, especially a method for extracting gold from gold mine tailings. Background technique [0002] The recovery rate of gold production in my country is generally only about 50%. Half of the gold remains in the tailings. The main mineral composition of the tailings is quartz, muscovite, clay minerals (kaolin, illite), plagioclase and amorphous substances, with a small amount of sulfide minerals such as pyrite. The particle size of the gold mine tailings is fine, mainly in the range of 0.05 mm to 0.1 mm (150 mesh to 300 mesh), with a weight fraction of about 83.2%, showing fine-grained silt-like tailings. The gold grade of the tailings is relatively high, with an average of 1.0g / t and a maximum of 1.31g / t, which has important recovery value. Tailings are rich in elements O, Si, Al, Fe and K, followed by Mg and Ca, and Na, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/44
CPCY02P10/20
Inventor 宾丽萍宾丽英
Owner 宾丽萍
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