Method for gold recovery from gold-containing raw material

FIELD: noble metal metallurgy, in particular gold recovery from churlish hard-cleaning raw materials such as coal and divot.

SUBSTANCE: cold-containing raw materials (e.g., black and brown coal and divot) contains gold in form of chemical compound with complex organic substances such as guminic acid, and in process of fuel burning gold easily volatilizes together with gaseous burning products. Method of present invention includes backing of said raw materials under air discharge and sublimate is absorbed by passing of exhaust gases through vessel with water and column filled with granulated activated carbon as sorptive agent.

EFFECT: gold recovery from gold-containing raw material with improved yield.

1 ex, 1 tbl

 

The invention relates to the field of processing of gold-bearing raw materials, in particular for the extraction of gold from organic matter by sorption on activated carbon from alkaline pulps.

The method for extracting gold from gold-bearing raw materials, which consists in processing solutions, which include substances, dissolving the gold, followed by extraction of gold from the liquid phase of the pulp using sorbents [1]. This is the closest equivalent.

Feature of natural organic substances, such as coal, lignite, peat as a raw material containing gold, is that gold in organic compounds present in the native metallic form, as in the ore, and in the form of chemical compounds with complex organic substances humic acids (Geminate). Conventional hydrometallurgical methods for extracting gold, for example, ore cyanidation with the transfer of gold in the liquid phase in the form of a cyanide complex subsequent deposition of gold adsorption on activated carbon or ion exchange resins, is unacceptable for the coal feedstock. The reason for this is that the presence of gold in coal in the form of complex compounds with humic acids makes it a completely inert with respect to cyanide, as other solvents metallic gold. The translation of the gold is in the liquid phase of the coals is possible only together with humic acids. Translation of humic acids, insoluble in water, in liquid phase, for example, in the form of luminato sodium (caustic lye) [2].

The technical result is the creation of a method, which can effectively carry out the process of gold extraction from natural organic substances.

The technical result is achieved by a method of extracting gold from gold-bearing raw materials, including raw materials processing solution and subsequent extraction of gold from the liquid phase of the pulp contact with the sorbent is activated carbon, according to the invention, the processing of raw materials containing gold in the form of chemical compounds with humic acids, carried out with a solution of caustic alkali, and the sorbent directly before contact with the liquid phase of the pulp activated by annealing for 12-15 minutes and poured it in the liquid phase in a glowing condition.

Example.

Coal, crushed to pieces up to 3-5 mm, treated with a one percent solution of caustic alkali at a ratio of liquid to solid as 10:1. The processing is carried out first hot solution at a temperature of 90-95°C. the Solution is cooled for 24 hours with occasional stirring. Then the solution is separated from the remainder of the coal. The bulk of gold goes humanity solution. For further extraction of gold from huminator solution produce sorption his Grand the new activated carbon. Activation of the sorbent is carried out directly before contact with the solution. For this coal sorbent is heated in a furnace up to 800-850°C for 12-15 min and in scorching form fall asleep in humanity solution. Subsequent agitation of the solution with the sorbent is carried out by a mechanical stirrer for 6-8 hours, and then separated from the sorbent in the sieve. Analysis of coal sorbent to spend gold assay method.

The table shows the results of the test method on the coal deposits in the Amur region.

Table
The name of the coal depositsThe gold content in the coal, g/tThe extraction of gold on the sorbent, %
Sergeev field1781
Agacinski field3072
Raichikhinskoe field5357

SOURCES of INFORMATION

1. Lobastov CENTURIES Technique and technology of gold extraction abroad. - M., Ed. “Metallurgy”, 1973, s-213, 234.

2. Taits E.M., Andreeva I.N. Methods of analysis and testing of coal. M., Nedra, 1983, p.102-103.

The method of extracting gold from gold-bearing raw materials, including raw materials processing solution and subsequent extraction C is the lot of the liquid phase of the pulp contact with the sorbent - activated carbon, characterized in that the processing of raw materials containing gold in the form of chemical compounds with humic acids, carried out with a solution of caustic alkali, and the sorbent directly before contact with the liquid phase of the pulp activate the ignition within 12-15 min and poured it in the liquid phase in a glowing condition.



 

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