Method for extracting gold from geyerite through microwaves

Abstract

The invention belongs to the technical field of wet metallurgy and particularly relates to a method for extracting gold from geyerite through microwaves. The geyerite is subjected to primary microwave treatment, and the microwaves act on substance molecules by means of the specific property of the microwaves, so that molecular motion is accelerated, mutual friction occurs, a lot of heat is generated, reaction is accelerated, the reaction time is greatly shortened, the production efficiency is improved, and the extracting rate of the gold is ensured; during leaching, the microwaves emitted from a microwave reaction kettle are adopted again to enable the material to be continuously subjected to strengthening reaction and decomposition, and thus the leaching rate of the gold is greatly increased; and in addition, the reaction time is further greatly shortened through microwave reaction and shortened from 72 h to 2 h, so that the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for extracting gold from pyrarsenite ore by using microwaves. Background technique [0002] At present, the extraction of gold is mainly carried out from sulfide gold ore, and sulfide gold ore is classified into pyrostite, magnetite and pyrite according to the content of sulfur and arsenite; and gold in Sulfide gold deposits are also accompanied by these types of minerals. The main form of occurrence in the ore is the close combination of ultrafine particles and pyrite, and the fineness in the ore has reached the sub-microscopic particle level, of which large Part of the gold is inlaid into the molecular lattice of pyrite to form a mutual solution. When this characteristic sulfide gold ore is ground, the maximum fineness that can be achieved cannot expose the gold from the pyrite combination. , and it is difficult to make gold form free surface particles on the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the extraction of gold is mainly carried out from sulfide gold ore, and sulfide gold ore is classified into pyrostite, magnetite and pyrite according to the content of sulfur and arsenite; and gold in Sulfide gold deposits are also accompanied by these types of minerals. The main form of occurrence in the ore is the close combination of ultrafine particles and pyrite, and the fineness in the ore has reached the sub-microscopic particle level, of which large Part of the gold is inlaid into the molecular lattice of pyrite to form a mutual solution. When this characteristic sulfide gold ore is ground, the maximum fineness that can be achieved cannot expose the gold from the pyrite combination. , and it is difficult to make gold form free surface particles on the surface of the ore. Therefore, when taking solution leaching, the agent cannot contact the surface of gold and it is difficult to dissolve it by biochemical reaction with it, which leads to a low extraction rate of gold. , a large waste

[0003] For this reason, some researchers pretreated the sulfide ore, then leached the pretreated ore, and then enriched and separated the gold to obtain gold, thereby achieving the purpose of extracting gold; but in the whole process, Both are carried out by oxidation-reduction reaction, and then a potential difference will be formed in the solution, and in the leaching step, when the potential difference is low, the gold leaching rate is low, which in turn will lead to a large amount of waste and waste of gold. Increase the extraction cost of gold

In addition, the extraction rate of gold extracted from the solution in the prior art is low, 80-90%, and a large amount of gold elements are discharged with the waste liquid, resulting in waste