RU2467083C1 - Method of extracting gold from mineral stock bearing minor gold fractions - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: invention relates to mineral stock processing and may be used for extracting gold fractions of grain size smaller than 0.07 mm. Proposed method comprises preparing water suspension with addition of flocculating agent. Damped ground paper bulk is added to said suspension, paper bulk features reduced moisture resistance and mineral component-to-bulk ratio making 1: 0.05. Then, mix is mixed in mixer for 10 s. After mixing, paper bulk is separated on sieve with mesh size not exceeding 0.2 mm. Now, paper bulk is rinsed to produce concentrate to be dried and fused.

EFFECT: higher efficiency, lower costs.

1 ex

Description

The invention relates to the enrichment of mineral raw materials and can be used to extract small fractions of gold with a particle size of less than 0.07 mm

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

The disadvantage of this method is the multi-stage extraction process, the need for processing 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 disadvantage of this method is 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 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 s obtaining a phase containing an 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 from mineral raw materials, including the preparation of an aqueous suspension with the addition of a flocculant solution, crushed wet paper pulp with reduced moisture resistance in the ratio of the mineral component to the paper pulp is added as 1: 0.05, followed by mixing the mixture in mixing device for 10 s, separating the pulp on a sieve with a mesh size of not more than 0.2 mm, washing the pulp, drying the resulting concentrate, followed by melting.

The combination of new essential features allows us to solve a new technical problem - increasing the efficiency of gold extraction and reducing the cost of reagent processing.

The implementation of the method is as follows.

Example 1

Ten grams of sample — a magnetic concentrate with a gold content of 365 g / t, with a particle size of gold less than 0.07 mm, were placed in a container and filled with 150 ml of water and 2 ml of a 0.1% flocculant solution. Added crushed wet paper pulp with reduced moisture resistance in the ratio of the mineral component to the paper pulp as 1: 0.05. The mixture was mixed in a mixing device for 10 s, the paper pulp was separated on a sieve with a mesh size of not more than 0.2 mm, the paper pulp was washed, the resulting concentrate was dried, and then melted. Gold recovery averaged 75-83%.

Example 2

Ten grams of sample — a non-magnetic concentrate of the Tokur deposit with a gold content of 400 g / t, with a particle size of gold less than 0.07 mm, was processed in compliance with the operations as in the first experiment. Gold recovery averaged from 73 to 82%.

The method allows to increase the extraction and environmental safety of the process of extracting fine particles of gold from the concentrate.

Information sources

1. A new process for the extraction of gold mining mining. 1990. 163. No. 1. C.62-63.

2. Patent No. 600606, Australia. Extraction of freeze-dried mineral particles of gold, platinum, diamonds 08/16/90.

3. Patent RU 2130499. The method of separation of finely dispersed metals, 05.20.99.

Claims (1)

A method of extracting gold from mineral raw materials, including the preparation of an aqueous suspension with the addition of a flocculant solution, characterized in that the suspension is added crushed wet paper pulp with reduced moisture resistance in the ratio of the mineral component to the paper pulp as 1: 0.05, followed by mixing the mixture in a mixing device within 10 s, the paper pulp is separated on a sieve with a mesh size of not more than 0.2 mm, the paper pulp is washed to obtain a concentrate, and the resulting concentrate is dried with subsequent melting.