RU2233342C1 - Method for extraction of gold in dressing mineral raw - Google Patents

Abstract

FIELD: mineral substances, precious metals.

SUBSTANCE: invention relates to extraction of gold in dressing mineral raw. Method involves preparing an aqueous suspension, its treatment with reagent, stirring and separation of gold from suspension in ore-dressing apparatus. Mixture of hypochlorite lime with potassium bromide or mixture of hypochlorite lime with sodium bromide are used as reagents taken in the ratio of reagents = 1:2 in the amount up to 50 g/t. Treatment is carried out at pH value 3-5. Method provides enhancing extraction of gold.

EFFECT: improved extracting method.

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Description

The invention relates to mineral processing and can be used to extract small fractions of gold from ores, sands of placer deposits, concentrates or tailings of processing plants.

A known method for the extraction of gold, based on a change in the surface-active properties of gold particles by hydrocarbon metals. The hydrophobic surface of the gold particles is coated with an oil film. Such olefin particles agglomerate into larger aggregates that are recovered by flotation or classification. The agglomerated product is subjected to calcination, and the ash obtained as a result of calcination is smelted [1].

The disadvantages of this method are the multi-stage extraction process, the need to destroy agglomerates by firing.

A known method of extracting lyophilic mineral particles of gold, platinum, diamonds by mixing ore sludge with oil and coal particles. Then the resulting product is subjected to pyrolysis or burn coal and oil from it. It was also proposed to treat the pulp after adsorption with a reagent that dissolves the oil to destroy the resulting agglomerates, and then separate the dispersed mixture of carbon particles and other components by specific gravity [2].

The disadvantages of this method are the multi-stage extraction process, the need to destroy agglomerates by calcination or the use of organic solvents.

The closest in technical essence to the proposed solution is a method for the separation of finely dispersed metals from mineral products, which consists in the fact that the gold is extracted by preparing an aqueous suspension of gold-containing material, treating it with iodine in an amount of up to 300 g / t at a pH of 8-11 medium to obtain phase containing the enlarged metal, and separating it from the suspension. [3].

The disadvantages of the method include the relatively high consumption of an expensive reagent - iodine.

The technical result is to increase the efficiency of gold recovery and reduce the cost of reagent processing.

The technical result is achieved by the fact that in the method of extracting gold in the enrichment of mineral raw materials, including the preparation of an aqueous suspension, processing it with a reagent, mixing and separating gold on the beneficiation apparatus, a mixture of bleach with potassium bromide or a mixture of bleach with sodium bromide with the ratio of reagents in the mixture 1: 2 and the amount of the mixture up to 50 g / t, and processing is carried out at pH 3-5.

The addition of a mixture of bleach with sodium bromide or a mixture of bleach with sodium bromide in an amount of up to 50 g / t in an aqueous suspension of gold-containing material in a ratio of reagents in a mixture of 1: 2 and pH 3-5 of the medium, followed by stirring and separation of gold from the suspension in a concentration The apparatus increases the efficiency of gold extraction. During the reagent processing of the material, the surface of free gold acquires hydrophilic properties; as a result, the particles are not washed off by water in tails.

The implementation of the method was carried out as follows.

Example 1. A suspension is prepared from 1 kg of rock and 150-200 ml of water. The gold content in the samples is about 70 mg with a particle size of -0.5 + 0.1 mm, including the classes -0.5 + 0.25 50 mg, -0.25 + 0.1 20 mg. A mixture of bleach and potassium bromide in an amount of 30 mg in a ratio of 1: 2 at a pH of 3-5 medium is added to the suspension. The suspension is mixed for 20-30 minutes and served on a concentration table. For comparison, 1 kg of a similar sample is washed on a concentration table without reagents. The resulting concentrates are analyzed for gold content. The recovery of gold in concentrate in samples treated with a reagent is increased by 18-22% compared with experiments without a reagent, while the extraction in the fineness class -0.5 + 0.25 is increased by 23%, in the class -0.25 + 0 , 1 at 18%.

Example 2. A suspension is prepared from 1 kg of rock and 150-200 ml of water. The gold content in the samples is about 120 mg with a particle size of -0.5 + 0.1 mm, including the classes -0.5 + 0.25 100 mg, -0.25 + 0.1 20 mg. A mixture of bleach and sodium bromide in an amount of 30 mg at pH 3-5 is added to the suspension. The suspension is mixed for 20-30 minutes and served on a concentration table. For comparison, 1 kg of a similar sample is washed on a concentration table without reagent. The resulting concentrates are analyzed for gold content. The recovery of gold in concentrate in samples treated with a reagent is increased by 18-20% compared with experiments without a reagent, while the extraction in the class of fineness -0.5 + 0.25 increases by 16%, in the class -0.25 + 0 , 1 to 19%.

The method of extracting gold can increase the efficiency of extraction and reduce costs by 5 times.

Sources of information

1. A new process for extracting gold. Mining Magazin. 1990. 163. No. 1, p. 62-63.

2. Australian Patent 600606, 08.16.90. Extraction of lyophilic mineral particles of gold, platinum, diamonds.

3. Patent RU 2130499, 20.5.99. The method of separation of finely dispersed metals.

Claims (1)

A method of extracting gold in the enrichment of mineral raw materials, including the preparation of an aqueous suspension, processing it with a reagent, mixing and separating gold on an enrichment apparatus, characterized in that the mixture of bleach with potassium bromide or a mixture of bleach with sodium bromide in the ratio of reagents to mixture 1: 2 and the amount of the mixture up to 50 g / t, and processing is carried out at pH 3-5.