RU2452584C2 - Method of flotation extraction of fine gold - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to dressing of minerals and may be used for increasing dressing efficiency. Proposed method comprises grinding to required grain size, and flotation with adding collector and foaming agent T-80. Said grinding is carried out by ore mechanical activation in solution of copper vitriol with subsequent flotation. Note here that said collector represents mix of solutions of potassium isoamyl xanthate per 20 g/t of ore and potassium butyl xanthate per 80 g/t of ore.

EFFECT: higher yield of gold.

1 tbl

Description

The invention relates to the field of mineral processing and can be used in the processing of refractory gold-bearing ores.

A known method for the extraction of gold, based on a change in the surface-active properties of gold particles with metal salts of fatty acids. 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 resin obtained as a result of firing is smelted [1].

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

A known flotation method, including conditioning the pulp with potassium butyl xanthate and an additional collector, which is used as a concentrate of ketosulfides, which is a mixture of 3,7-dimethyl-5 tianonan-2,8-dione, 3-methyl-5 thiahexan-2-one 3-methyl-5 thiaheptan-2-one, 3,6-dimethyl-5 thiaheptan-2-one, 3-methylthiacyclohexan-4-one, 1,4,5-trimethyl-7 thiabicyclooctan-2-one, isomers 3 , 4,6-trimethyl-2-cyclohexen-1-one, the latter is introduced in an amount of 0.25-0.5 fractions of a unit of the total consumption of collectors [2].

The disadvantages of this method is that the reagent based on the ketosulfide concentrate used in this case is selective only with respect to molybdenum and is not very effective for gold. Flotation takes place in an alkaline environment, which requires an additional consumption of reagents.

A known method of flotation using flotation reagent for foam flotation of sulfide ores of non-ferrous metals based on organic sulfide and thiophosphate with the content of components: organic sulfide - 20-80%, thiophosphate 20-80%. As an organic sulfide, a mixture of tertiary branched alkyl-, alkenyl sulfides of an unspecified composition is used [3].

The disadvantage of this method is that this reagent is difficult to synthesize and expensive, in addition, it is not sufficiently selective with respect to gold.

Closest to the proposed method of the invention is a method for extracting valuable components from gold-bearing sulfide ores, including preliminary wet grinding and subsequent flotation with the introduction of potassium butyl xanthate and T-80 blowing agent, after the introduction of potassium butyl xanthate, a valuable component is added as an activator of the hydrophobization process of 3.4 dihydro, 2,5,7,8 tetramityl-2 [4,8,12 trimethyl tridecyl] 2H-1 benzopyran-6-ol-acetate with phospholipids in the ratio of 3.3: 1, then foamed eh [4].

The disadvantage of this method is that the use of this reagent does not sufficiently ensure the effectiveness of the process.

The technical result is to increase the efficiency of gold recovery.

The technical result is achieved by the fact that in the method of flotation extraction of finely dispersed gold, including grinding to a technologically ready size class and subsequent flotation with the introduction of a collector and foaming agent T-80, grinding to a technologically ready size class is carried out by mechanochemical activation of ore in a solution of copper sulfate followed by flotation, in this case, as a collector, a mixture of potassium isoamyl xanthate solutions is used at a flow rate of 20 g / t of ore and butyl xanthate Alia at a rate of 80 g / t ore.

The use of copper sulfate in a solution of copper sulfate and subsequent flotation with a mixture of solutions of butyl and isoamyl xanthates by grinding to a technologically ready size class allows for additional sulfidization, in which hydrochemical oxidation of ore minerals and partial opening of refractory host minerals occurs, which makes it possible to more effectively prepare the surface of minerals for sorption collector and the formation of chemisorption bonds with finely disseminated gold.

The use of a mixture of collectors intensifies the extraction of gold-bearing minerals in a concentrate due to the formation of complex bonds of potassium butyl xanthate with gold particles, while potassium isoamyl xanthate increases the hydrophilicity of the gold-containing material. The combined effect gives a resonant effect to increase the efficiency of gold extraction.

The implementation of the method was carried out as follows.

A sample of gold-bearing ore was subjected to mechanochemical activation by grinding to a finished size class in a solution of copper sulfate and, during subsequent flotation, with a collector and foaming agent T-80 (40 g / t), a mixture of solutions of potassium isoamyl xanthate at a flow rate of 20 g / t ore and butyl was used as a collector potassium xanthate at a flow rate of 80 g / t ore. After the flotation process, an analysis of the enrichment products was performed.

The use of a mixture of the proposed solutions of xanthates increased gold recovery in flotation concentrate to 94.29%.

For comparison, 1 kg of a similar sample ground to a particle size of -0.071 + 0 mm was subjected to flotation enrichment under standard conditions: collector - potassium butyl xanthate (100 g / t); blowing agent - T-80 (40 g / t). The extraction of gold in flotation concentrate amounted to 87.1%.

The research results are shown in table 1.

Table 1 Experience conditions Grinding a sample without using a reagent; collector - butyl potassium xanthate (100 g / t), blowing agent - T-80 (40 g / t); T: W = 1: 1; neutral environment Grinding the sample using copper sulfate (100 g / t); collector - a mixture of solutions: potassium isoamyl xanthate (20 g / t), potassium butyl xanthate (80 g / t); blowing agent - T-80 (40 g / t), T: W = 1: 1; neutral environment The yield of concentrate,% The gold content in the concentrate,% Extraction of gold in concentrate,% The yield of concentrate,% The gold content in the concentrate,% Extraction of gold in concentrate,% 5.8 31.54 87.1 4.42 44.8 94.29

According to the results of the analysis of flotation concentrates, the extraction of finely dispersed gold when using a mixture of collectors and mechanical activation by grinding in a solution of copper sulfate increases by 7.19% compared with the standard scheme.

The method does not require special processing equipment and can be carried out in the technological process of any gold mining enterprise.

Information sources

1. Pokolova Yu.V., Grabovsky A.I. Activated carbon sorbents for the extraction of precious metals // Non-ferrous metallurgy - 1999, No. 5, p. 58-60.

2. Algebraistova N.K., Gudkova N.V., Alekseeva E.A. and others. The method of flotation of sulfide gold-bearing ores. Patent No. 2185249, IPC B03D 1/02, 07.20.2002.

3. Khersonsky M.I., Desyatov A.M., Mantsevich M.I. et al. Flotoreagent for foam flotation of sulfide ores of non-ferrous metals. Patent No. 2002105264. IPC B03D 01/014, 10/10/2003.

4. Patent RU 2339455, 11.27.08. The method of extracting valuable components from gold-bearing sulfide ores.

Claims (1)

The method of flotation extraction of finely dispersed gold, including grinding to a technologically ready size class and subsequent flotation with the introduction of a collector and foaming agent T-80, characterized in that grinding to a technologically ready size class is carried out by mechanochemical activation of ore in a solution of copper sulfate followed by flotation, while as a collector, a mixture of potassium isoamyl xanthate solutions at a flow rate of 20 g / t ore and potassium butyl xanthate at a flow rate of 80 g / t ru is used dy.