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Gold leaching method adopting ferrous ions and magnesium thiosulfate

A technology of magnesium thiosulfate and ferrous ions, applied in the field of leaching gold from magnesium thiosulfate, using ferrous ions, can solve the problems of unfriendly environment, difficult recovery of gold in leaching solution, high consumption of thiosulfate, etc. Competitive adsorption, reduced consumption, and the effect of solving high consumption of thiosulfate

Inactive Publication Date: 2018-09-18
CENT SOUTH UNIV
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  • Description
  • Claims
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Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for leaching gold using ferrous ions and magnesium thiosulfate to solve the problem of high consumption of thiosulfate in the traditional thiosulfate gold leaching method, which is not friendly to the environment and the problem of gold leaching in the leaching solution. Difficult to recycle

Method used

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  • Gold leaching method adopting ferrous ions and magnesium thiosulfate
  • Gold leaching method adopting ferrous ions and magnesium thiosulfate

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preparation example Construction

[0029] Preparation of magnesium thiosulfate: Add ammonium thiosulfate to magnesium hydroxide in a molar ratio of 1:1 into a beaker, heat to 45°C and keep constant temperature, and remove NH in the solution 3 . After a certain period of time, use a wet red litmus test to test, if the test paper does not turn blue, it means that NH 3 Has been drained to obtain magnesium thiosulfate solution.

[0030] Raw material condition 1: A flotation gold concentrate, in which the grade of Au is 42.49g / t, and the mass contents of Cu, Fe, Pb, S, As, Sb, and C are respectively 0.20%, 16.93%, 0.19%, and 14.25% , 5.40%, 0.67%, 0.80%. Its mineral composition is mainly pyrite and quartz. Table 1 shows the chemical phase analysis results of gold in the flotation gold concentrate.

[0031] Table 1 Chemical phase analysis results of gold in flotation gold concentrate

[0032]

Embodiment 1

[0036] Using pulp with the same particle size and mass concentration as Comparative Example 1, first add ferrous sulfate to the pulp to a concentration of 0.01mol / L, and then adjust the pH value of the pulp to 8.0 with sodium hydroxide. Then, add magnesium thiosulfate to a concentration of 0.3mol / L, adjust the pH value of the pulp to 10.0 with sodium hydroxide again, and other leaching conditions are the same as in Comparative Example 1, the leaching rate of gold is 72.25%, and the consumption of magnesium thiosulfate The amount is 23.28kg / t raw material. The recovery conditions of gold in the leaching solution are the same as those in Comparative Example 1, but the desorption of the gold-loaded resin adopts a one-stage process, and the recovery rate of gold is 99.2%.

Embodiment 2

[0038] Using the pulp with the same particle size and mass concentration as in Comparative Example 1, first add ferrous sulfate to a concentration of 0.03mol / L, then use sodium hydroxide to adjust the pH value of the pulp to 8.0, and then add magnesium thiosulfate to a concentration of 0.5mol / L, adjust the pH value of the pulp to 10.0 with sodium hydroxide again, and other leaching conditions are the same as those in Comparative Example 1, the gold leaching rate is 73.32%, and the consumption of magnesium thiosulfate is 25.58kg / t raw material. The recovery conditions of gold in the leaching solution are the same as in Implementation 1, and the recovery rate of gold is 98.9%.

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Abstract

The invention discloses a gold leaching method adopting ferrous ions and magnesium thiosulfate. The gold leaching method is characterized in that a ferrous ion solution and a magnesium thiosulfate solution is added into gold-containing minerals so as to leach out gold in the gold-containing minerals. According to the gold leaching method, oxidative decomposition of Cu(NH3)4<2+> to S2O3<2-> is eliminated, so that the consumption of thiosulfate is greatly reduced; Cu(S2O3)2<3-> / Cu(S2O3)3<5-> is prevented from disturbing gold adsorption by resin, the competitive adsorption of Cu(S2O3)2<3-> / Cu(S2O3)3<5-> to the gold on the surface of the resin is weakened, the recovery of the gold in a leachate adopting the resin adsorption method is facilitated, and the desorption of the gold-bearing resin can be realized by adopting a simple one-section process; and the addition of ammonia water is avoided, and therefore the threat of NH3 to the atmosphere and the environment of the water body is eliminated. The gold leaching rate of the gold leaching method is equivalent to that of a traditional gold leaching method adopting copper ions, ammonia or thiosulfate, but the gold leaching method solves the problem that in the traditional gold leaching method adopting thiosulfate is high in thiosulfate consumption and unfriendly to the environment, and the recovery of gold from the leachate is difficult.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for leaching gold by utilizing ferrous ions and magnesium thiosulfate. Background technique [0002] The cyanidation method has mature technology, simple process and low cost, and is currently the most important method in the gold extraction industry. However, cyanide is highly toxic, the gold leaching rate is slow, and it is difficult to deal with complex gold ores containing copper and carbon. Therefore, the development of non-cyanidation gold leaching technology is of great significance. The thiosulfate method is widely considered to be the most potential non-cyanide gold leaching method because of its non-toxic and cheap leaching agent, fast gold leaching rate, and good leaching effect on refractory gold ores containing copper and carbon. However, the thiosulfate method has not yet been widely used in the industrial field. The main obstacles are the high co...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/04
CPCC22B3/04C22B11/04Y02P10/20
Inventor 徐斌姜涛李骞董中林杨永斌李科刘晓亮高伟周玉娟
Owner CENT SOUTH UNIV
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