Method for strengthening gold extraction of iron gold concentrate roasted product containing sulphur and arsenic

Abstract

The invention discloses a method for strengthening gold extraction of an iron gold concentrate roasted product containing sulphur and arsenic. The high-iron gold concentrate containing sulphur and arsenic, especially high sulphur and high arsenic, hinders the subsequent chemical gold leaching process after being subjected to oxidation roasting pretreatment because of the problem that iron oxide is inevitably generated to wrap gold in a high-temperature reaction process. The invention proposes a new method for strengthening gold extraction of the iron gold concentrate roasted product containing sulphur and arsenic by a flow of 'metallized reduction roasting-acid leaching-gold leaching', namely a method for strengthening gold extraction of the iron gold concentrate roasted product containing sulphur and arsenic aiming at the problem. The method comprises the steps of firstly, carrying out metallized reduction roasting on the iron gold concentrate roasted product containing sulphur and arsenic with a reducing agent, carrying out acid leaching on the metalized roasted product, and finally carrying out chemical leaching with an acid slag. By adopting the method disclosed by the invention, the leaching rate of the iron gold concentrate roasted product containing sulphur and arsenic is higher than 95%; and important theory and technical guidance are provided for effective gold extraction of the gold roasted product.

Description

technical field [0001] The invention belongs to the field of combined pyrometallurgy and hydrometallurgy, and relates to a new method for extracting gold from sulfur-containing arsenic-iron-gold concentrate calcine, so as to realize the effective exposure of wrapped gold in the calcine, thereby producing sulfur-containing arsenic-iron-gold concentrate The efficient gold extraction of calcine creates favorable conditions. Background technique [0002] With the rapid development of the gold industry, easy-to-handle gold ores are gradually exhausted, and difficult-to-handle gold ores have gradually become the main processing resources of the gold industry. my country is relatively rich in refractory gold ore resources. Among the proven geological reserves in my country, refractory gold ore resources account for about 3 / 4 of the proven reserves, and the most typical ones are pyrite-type and arsenopyrite-type gold deposits. The proportions of pyrite and arsenopyrite in gold ore a...

AI Technical Summary

Problems solved by technology

However, during the pretreatment process of oxidative roasting, the secondary wrapping of iron oxides of gold inevitably occurs. For gold concentrate calcine with high iron content, the subsequent gold extraction process is obviously hindered, and the gold leaching rate is often less than 80%. There is an urgent need to develop new methods and technologies to more fully recover gold from this type of refractory gold ore and improve resource utilization

Compared with the Chinese patent "A Method for Strengthening Acid Dissolution of Sulfur-Containing Gold Concentrate Acidified Roasting Slag", the acidic leaching of FeO is relatively easy and does not require leaching aids, but the leaching conditions are still harsh, with the acid concentration reaching 3%~40%, and Second stage acid leaching is required