Technology for extracting gold from superfine carbonaceous gold ore containing arsenic sulfide

Abstract

The invention discloses a technology for extracting gold from a superfine carbonaceous gold ore containing arsenic sulfide. The gold extracting method is provided in a way of combining a complex technology. The technology is characterized in that gold losses caused by difficult dressing are avoided through the direct treatment of a primary ore; the primary ore is pretreated by an oxygen pressure technology, the sulfide is oxidized to release gold particles, and convenient carbonitriding leaching is realized; in the process of oxygen pressure oxidation pretreatment, reaction is carried out in a liquid phase, no sulfur dioxide or arsenic oxide escapes, and arsenic elements are trapped in leaching residues, so that environment problems are solved; meanwhile, the gold robbing activity of carbonaceous substances is partially or completely passivated; during carbonitriding gold leaching, the problems that difficult solid-liquid separation is caused by high clay and the like are avoided through the adoption of a CIL (Carbon-in-Leach) technology so as to increase the recovery rate of the gold and overcome environment pollution caused by emission in the gold extracting process.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and relates to a process for extracting gold from fine-grained carbon-containing, arsenic-containing, high-clay sulfide gold ores. Background technique [0002] Gold is one of the important precious metals and the first metal discovered and used by human beings. Due to its special physical and chemical properties, gold has long been used as precious jewelry and financial reserves. In modern history, with the development of modern science and technology, gold has also been widely used in electronics, computers, precision instruments, aviation, aerospace and other fields. [0003] With the depletion of easily leachable oxidized gold deposits on the surface, most of the primary gold deposits discovered in recent decades are complex and refractory sulfide deposits. There are many such gold resources in my country, and they are more complex. For example, the fine-grained carbonaceous arsenic-containin...

AI Technical Summary

Problems solved by technology

However, due to problems such as large investment, easy pollution of the environment, and limited market for by-products (sulfuric acid and arsenic oxide), the application of roasting pre-oxidation sulfide ore (or concentrate) technology is greatly restricted; some mining companies use chemical oxidation and biological pre-oxidation. However, if the problem of arsenic is not effectively solved, it will cause potential environmental pollution, and the production cost of the former is relatively high, so it is currently unsustainable; the existence of high clay not only causes flotation The recovery rate of enriched sulfide ore (or gold) is low, and the solid-liquid separation of the cyanidation gold leaching slurry is very difficult, and part of the dissolved gold is lost in the leaching residue, resulting in difficulties in the separation of the gold-rich solution and the leaching residue.