RU2525193C1 - Extraction of fine gold from argillaceous sediments - Google Patents

Abstract

FIELD: mining.

SUBSTANCE: invention relates to concentration of minerals and can be used for extraction of fine gold from argillaceous sediments. This method comprises preparation of suspension of argillaceous sediments, trapping of fine gold from said suspension by introduction of vegetable material-based sorbent premixed to 0.3 mm grain size in suspension and mixing. Then, sorbent is flushed through 0.3 mm mesh screen, dried and subjected to assay fusion. Note here that suspension is prepared at S:L ratio of 1:25. Sorbent is added to suspension activated in mixer to homogeneous state for 3-5 minutes and, then, mixed for 30-40 seconds. After sorption, loose flakes bearing gold are flushed.

EFFECT: higher yield, environmental safety.

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Description

The invention relates to mineral processing and can be used to extract finely dispersed gold from clay deposits.

A new process for the extraction of gold is known, based on a change in the surface-active layer of gold particles by hydrocarbons. 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 ash obtained as a result of firing is smelted [1].

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

A known method for the separation of finely dispersed metals from mineral products, which consists in the fact that the extraction of gold is carried out by preparing an aqueous suspension of gold-containing material, treating it with iodine in an amount of 300 g / t at a pH of 8-11 medium to obtain a phase containing an enlarged metal, and separating it from suspension [2].

The disadvantage of this method is the low efficiency of gold recovery.

The closest in technical essence to the proposed solution is a method for extracting gold from industrial silt sediments, including preparing a dry mixture from silt sediments with the addition of bleach, preparing a suspension by adding a solution of sulfuric acid to the mixture, and subsequent sorption of gold by a plant-type sorbent. Preparation of the dry mixture is carried out by mixing sludge in the form of fractions with a particle size of less than 0.05 mm with bleach in a ratio of 100: 5. The suspension is prepared by adding to a dry mixture a 10% solution of sulfuric acid in an amount of 250 ml and stirring in a mixing device for four hours. Then sorption is carried out by introducing into the resulting suspension a plant-type sorbent, crushed to a particle size in the range of less than 0.5 and more than 0.2 mm after heat treatment at 200 ° C for one hour, and additional stirring for 20 minutes. After sorption, the mixture is washed with water on a sieve with mesh sizes of less than 0.5 and more than 0.2 mm, drying and assay melting [3].

The disadvantages of this method include the need to create conditions for the dissolution of gold and sorption, which increases the multi-stage process of extraction and reduces its environmental safety.

The technical result of the invention is to increase the extraction of the finely dispersed phase of gold from clay deposits in an effective and environmentally friendly way.

The technical result is achieved in that in a method for extracting finely dispersed gold from clay deposits, including preparing a suspension from clay deposits, trapping finely dispersed gold from a suspension by sorption by introducing a sorbent based on plant material, previously crushed to a particle size of 0.3 mm, into the suspension and mixing, s subsequent washing of the sorbent on a mesh with a mesh size of 0.3 mm, drying and assay melting, the suspension is prepared at a ratio of T: W as 1:25, the sorbent on again, the vegetable material after grinding is soaked to loose flakes, sorption is carried out by introducing the sorbent into the suspension, activated in the mixing device until smooth for 3-5 minutes, and then stirring in the mixing device for 30-40 seconds, after sorption, washing the loose flakes containing gold.

The presence of significant features makes it possible to capture finely dispersed gold directly from a suspension with a sufficiently high percentage of extraction of finely dispersed gold - more than 70%.

The method is as follows.

Example 1

From 100 g of dry weighed sample with a particle size of -0.1 mm of the “Crazy” high-clay placer (Lower Amur) containing 3 g / t of gold, a suspension was obtained at a T: W ratio of 1:25 in a volume of 2.5 l. The suspension was activated for 3-5 minutes until smooth, 5 g of sorbent based on plant material was added. Before application, the sorbent based on plant material was crushed to a particle size of 0.3 mm and soaked to loose flakes. A sorbent was added to the suspension activated in the mixing device and stirring was continued for another 30–40 seconds. After sorption, washing of loose flakes containing gold was carried out on a mesh with a mesh size of 0.3 mm, drying and assay melting.

According to numerous experiments, gold recovery averaged 72%.

Example 2

One hundred grams of a dry sample with a particle size of -0.1 mm of the Sobolinka clay deposit (Lower Amur) with a gold content of 5 g / t was subjected to operations as in the first example. According to numerous experiments, gold recovery amounted to 70%.

Example 3

Similar experiments were carried out on natural clay of the Kolchan deposit (Nikolaevsky district) with a gold content of 4 g / t, where, according to numerous experiments, gold extraction was also average of 73%.

The method allows to increase the extraction of fine fractions of gold, provides environmental safety and does not require expensive equipment.

Information sources

1. A new process for the extraction of gold Mining Magazin, 1990. 163 No. 1. from 62-63.

2. Patent No. 2130499 Russian Federation. The method of separation of finely dispersed metals. / Koltun A.G., Kostylev D.S., Yatlukova N.G. 05/20/99.

3. Patent No. 2340689 Russian Federation, IPC С22 В 11/00. The method of extracting gold from silt man-made deposits. / Litvintsev B.C., Ponomarchuk G.P. and etc.; Applicant and patent holder Federal state. the budget. Institute of Science, Mining Institute, Far Eastern Branch of the Russian Academy of Sciences. - No. 2007121108/02; declared 06/05/2007; publ. 12/10/2008, Bull. Number 34. - 5 sec.

Claims (1)

A method for extracting finely dispersed gold from clay deposits, including preparing a suspension from clay deposits, trapping finely dispersed gold from a suspension by sorption by introducing a sorbent based on plant material, previously crushed to a fineness of 0.3 mm, into the suspension and mixing, followed by washing the sorbent on a mesh with mesh size 0 , 3 mm, by drying and assay melting, characterized in that the preparation of the suspension is carried out at a ratio of T: W 1:25, a sorbent based on plant material after grinding, soak to loose flakes, sorption is carried out by introducing the sorbent into the suspension activated in the mixing device until smooth for 3-5 minutes, and then stirring in the mixing device for 30-40 seconds, and after sorption, washing the loose flakes, containing gold.