Nontoxic process for extraction gold from gold-bearing tailing

A technology of tailings and mineral processing agents, applied in the field of mineral processing, can solve the problems of high cost and small processing capacity, and achieve the effect of high recovery efficiency and low recovery cost

Inactive Publication Date: 2009-02-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although magnetic fluid separation does not pollute the environment, it is limited to the selection of placer gold and replaces amalgamation operations. Bec

Method used

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  • Nontoxic process for extraction gold from gold-bearing tailing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take 1000 grams of high-bismuth-type gold-bearing tailings in Shandong, first classify, sieve out particles > 200 mesh, ball mill to ≤ 200 mesh, put them in the slurry mixing tank, add water at a ratio of 1 / 2.5 of mineral water, and adjust the slurry to the concentration is 40%, add concentration by weight percentage and be 2.0g of sulfuric acid of 95%, stir ten minutes, place the ore slurry after lowering down in the gold immersion tank, add thiourea 1.5g by weight percentage, simultaneously with 6 liters per hour Inject air into the gold immersion tank at a high speed, then add 2.5g of ferric chloride, and then press 6m 2 / m 3 The measurement put the zinc-iron plate in the gold leaching tank and leached for 43 hours. The gold was replaced with the zinc-iron plate. The gold extraction rate was 89.8%.

Embodiment 2

[0028] Take 1000 grams of gold-containing tailings from a gold mine in Shandong, first classify, screen out >200 mesh particles, ball mill to ≤200 mesh, put them in the slurry mixing tank, add water at a ratio of 1 / 2.5 of the mineral water, and adjust the slurry to a concentration of 40%, adding 1.4g of sulfuric acid with a concentration of 98% by weight percentage, stirring for 8 minutes, placing the lowered ore slurry in a gold leaching tank, adding thiourea 3.6g by weight percentage, and simultaneously at a speed of 6 liters per hour Air is introduced into the gold leaching tank, and then 6.0 g of 732 cation exchange resins are added, the gold is adsorbed by the 732 cation exchange resins, and the extraction rate of gold is 90.8%. After pressure filtration, the tailings are discarded, and the leaching liquid is recovered and reused.

Embodiment 3

[0030] Take 1000 grams of gold-containing tailings from a gold mine in Jilin, first classify, screen out >200 mesh particles, ball mill to ≤200 mesh, put them in the slurry mixing tank, add water at a ratio of 1 / 2.5 of the mineral water, and adjust the slurry to a concentration of 40%, adding concentration by weight percentage is the sulfuric acid 3g of 96%, stirs 5 minutes, the ore slurry after lowering is placed in gold immersion tank, adds thiourea 3.5g by weight percentage, simultaneously with the speed of 6 liters per hour to Put air into the gold leaching tank, then add 5.0g of anhydrous ferric sulfite, and then press 12m 2 / m 3 The metering of the zinc iron plate is placed in a gold immersion tank, adjusted by adding 200g / t of sodium hydroxide, and leached for 40 hours. The gold is replaced with the zinc and iron plates, and the gold extraction rate is 91.6%. After pressure filtration, the tailings are discarded, and the ore leaching liquid is recovered and reused.

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Abstract

The invention related to a beneficiation method, in particular to a beneficiation method of high bismuth and poly-metal intergrowth gold ores or accompanying gold ores, specifically, a non-toxic extraction method of gold from gold-containing tailings is referred. An organic chemical reagent is taken as a leaching agent, metal oxide and air are taken as activators, acid or alkali is taken as a regulator, cation exchange resin is taken as an adsorbent, and nonferrous metal is taken as a displacer. The gold is separated out by the displacer or is adsorbed by the cation exchange resin to obtain gold concentrate, the immersion fluid is pressed and filtered for separating the residue and the liquid, the immersion fluid without the residue can be recovered and reused. The agents used in the method are non-toxic and has no harm to human body. The method does not produce industrial pollution and has low recovery cost and high recovery rate.

Description

technical field [0001] The invention relates to a beneficiation method, especially a beneficiation method for high-bismuth and polymetallic symbiotic or associated gold mines, especially a non-toxic recovery method for gold in tailings. Background technique [0002] Human beings have a very long history of developing gold, and there are many ways to extract gold, including physical methods, chemical methods, and combined methods of physical and chemical methods. So far, the methods for extracting gold from gold-bearing ores include gravity separation, amalgamation, cyanidation, flotation, thiourea, and bromination. These methods have been used in different historical periods and different mining enterprises, and have played a certain role, and have also promoted the development of gold mining. With the advancement of science and technology and the development of society, people's requirements for the environment are becoming more and more stringent, and the contradiction be...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/04
CPCY02P10/20
Inventor 张渊张兴州李俊锋佘振宝张五荣唐振张佳楠
Owner JILIN UNIV
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