A method of recovering gold from low-grade gold ore by flotation

Abstract

The invention discloses a method for flotation recovery of gold from of low-grade gold mine, and belongs to the technical field of mineral processing. The method comprises the following steps: (1) adding kerosene in the ore grinding process, and grinding the low-grade gold mine to a predetermined fineness; (2) adding activated carbon, and performing stirring; (3) carrying out rough flotation: adding an inhibitor, a collecting agent and a foaming agent to a pulp obtained in step (2), and carrying out pneumatic flotation to obtain a foam product concentrate and a product rougher tailings in a tank; and (4) scavenging: adding the collecting agent and the foaming agent, and scavenging the rougher tailings to obtain middlings. The kerosene, activated carbon, the inhibitor, the combined collecting agent (mercaptobenzothiazole and xanthate MA-3) and the foaming agent are adopted in the invention, and have synergistic effects, so the problem of difficult effective recovery of the gold from existing low-grade gold mine is solved. The method has the advantages of simplicity in operation, low dosage of reagents, low cost, and meeting of industrial production requirements.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for recovering gold by flotation from low-grade gold ore. Background technique [0002] Gold is a metal widely used in the national economy and people's life, and its main functions are international currency, jewelry and electronic components. With the increasing level of industrial production and people's living standards, people's demand and consumption of gold is increasing. With the continuous mining of gold resources, not only the gold grade in the ore decreases, but also the intercalation relationship becomes more and more complicated. Gold ore embedded with fine particles is difficult to be separated and enriched by conventional flotation methods, and with the increase of grinding fineness, the gold recovery rate decreases. [0003] In order to improve the flotation index of gold, scientific researchers have carried out a lot of research ...

AI Technical Summary

Problems solved by technology

It is difficult to separate and enrich the gold ore with fine particles embedded in the conventional flotation method, and the gold recovery rate decreases with the increase of the grinding fineness

[0003] In order to improve the flotation index of gold, researchers have carried out many studies on the enhanced flotation separation of gold mines: (1) Gold extraction by cyanide: gold extraction by cyanide is the mainstream technology for gold extraction from gold mines, The cyanide tailings produced contain some heavy metal ions, cyanide and residual flotation agents. Cyanide is highly toxic, and its long-term large-scale stockpiling will pollute the environment; (2) Electrochemical control flotation technology: electrochemical The control flotation technology is applied to production practice, and it is found that compared with the original flotation process, the recovery rate and grade of gold in the obtained concentrate have been significantly improved, but the process is complicated and requires high equipment

(3) Carrier flotation: Carrier flotation is to add coarse particles with suitable particle size to the fine-grained flotation system. At this time, fine-grained minerals are usually attached to the coarse-grained carrier, and then the conventional flotation method is used to recover the valuable minerals. valence components, but the process requires a large amount of chemicals and subsequent separation is difficult, which increases production costs

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