A method and device for strengthening leaching of gold by controlling electric potential

Abstract

The invention discloses a method and device for potential-controlled reinforced gold leaching. The method comprises the steps of (1), adding a gold-containing material and water into the potential-controlled reinforced gold leaching device, and air is guided into the solution for carrying out slurrying treatment while stirring is carried out; (2), adjusting the pH value after the slurrying treatment is finished, adding thiourea into the solution, guiding the air into the solution to control the oxygen dissolution amount in the solution, adding ferric sulfate into the solution, carrying out potential-controlled reinforced leaching, and discharging the material after the reaction is finished; and (3), after material sedimentation and filtration separation, carrying out harmless stockpiling on tailings, wherein a pregnant solution is subjected to metal replacement filtration to obtain gold mud, and the tail liquid can be returned to the slurrying process for recycling after being simply treated. The invention further discloses the device for potential-controlled reinforced gold leaching. The method can be used for realizing efficient leaching of gold in sulphide ore gold ore and gold concentrate ore which are difficult to treat, and is a cyanide-free green gold extraction method which is high in speed, non-toxic and insensitive to impurities.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and mining engineering, and in particular relates to a method and a device for intensified leaching of gold by controlling electric potential. Background technique [0002] Gold is an internationally accepted currency and is often used in the manufacture of jewelry. Due to its excellent physical and chemical properties, it is also widely used in the electronics industry, chemical industry, and instrumentation manufacturing industry. With the rapid development of my country's national economy and the continuous improvement of people's living standards, the amount of gold required for industrial production and jewelry processing is also increasing year by year, and the scale of gold production continues to expand. Fine-grained gold ore, high impurity content, difficult to handle, and gold-containing secondary materials have become the main raw materials for gold production. [0003] At present, cyanid...

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Problems solved by technology

[0005] In CN1031255A disclosed thiourea-iron leaching gold extraction new industrial production process, the particle size of the leached material needs to be -320 mesh, the leaching time needs 32-40 hours, the crushing time is long, the cost is high, and the leaching cycle is too long

[0006] The disclosed method of extracting gold and silver with thiourea in CN1081471A has the advantages of high leaching rate and short production cycle, but the consumption of thiourea in the leaching process is large, and it is unfavorable for manual operation. The low-grade gold in the project does not necessarily have the high-grade gold and silver in the actual operation, and the leaching rate is as high as that of the original ore.

[0007] CN1544665A discloses the bio-oxidation of refractory gold concentrate—the process of extracting gold by thiourea resin pulp method, which has the advantages of high leaching rate and low cost, but its pretreatment process is loaded down with trivial details and takes a long time

[0008] A kind of thiourea carbon slurry gold extraction process disclosed by CN101338370A has the advantages of high recovery rate and environmental protection, but its defect is that the operation is complicated and the process cycle is long

[0009] CN102676838A discloses a gold cyanide tailings roasting-ultrasonic enhanced thiourea gold leaching-activated carbon enrichment gold extraction method, which has the advantages of short cycle and high leaching, but it has strong selectivity to materials, and the treatment capacity is small. The content of activated carbon is high, and it cannot be recycled effectively, so that a large amount of thiourea in the tail liquid is lost, and the production cost is high

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