Technology for preparing thiosulfate on site and extracting gold from refractory gold ore

Abstract

The invention relates to a technology for preparing thiosulfate on site and extracting gold from refractory gold ore. The technology comprises the following steps: crushing sulfur-containing refractory gold ore, and powdering by ball milling; roasting the powdered gold ore in one time under inert gas to obtain primary roasted ore and smoke A; roasting the primary roasted ore for the second time inair or oxygen-containing oxide mixed gas so as to obtain secondary roasted ore and gas B; cooling the gas B and charging into an alkaline solution for absorbing, so as to obtain a solution C; mixingthe smoke A and excessive hydrogen, and reacting to obtain a gas product D; reacting the cooled and dedusted gas D and B to generate sulphur; reacting sulphur and the solution C to obtain a thiosulfate solution. In case of gold ore without arsenic antimony, the technology comprises the following steps: cooling the smoke A, and reacting with the solution C to prepare thiosulfate solution; cooling and performing size mixing on the secondary roasted ore; and adding the thiosulfate solution to extract gold. The technology has the advantages of being green, environmentally friend, extracting gold without cyanogen, low in energy consumption, low in cost, high in economic benefit, high in social benefit, and high in environmental benefit.

Description

technical field [0001] The invention belongs to the field of mineral gold extraction, in particular to a process for preparing thiosulfate on site and extracting gold from refractory gold ores. Background technique [0002] Gold is one of the important precious metals. Due to its special physical and chemical properties, gold is not only used for jewelry and financial reserves, but also widely used in electronics, computers, precision instruments, aviation, aerospace and other fields. With the gradual depletion of mineral resources in the world, gold mines are more prominent, and refractory gold mines will become the main resource of gold ore in the future. [0003] The reserves of refractory gold mines account for more than 60% of the world's total gold reserves. This type of gold mines is mainly due to the presence of harmful elements such as sulfur, arsenic, and antimony, which affect the leaching of gold. Especially for gold mines with high sulfur content, there is no e...

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Problems solved by technology

The disadvantage is that the roasting is carried out in an oxygen-containing atmosphere, which releases a large amount of SO 2 、As 2 o 3 and other toxic and harmful gases; the furnace gas dust collection and purification device is complicated, the operating cost is high, and the environment is seriously polluted; the process operation requirements are strict, and it is easy to cause "under-burning" or "over-burning", which affects the recovery rate of gold; the removal rate of antimony is low; Subsequent recycling difficulties

However, the disadvantages of this process are: the design and material requirements of the equipment are very high; the investment in infrastructure is large, and only the construction of a large-scale treatment plant is economically reasonable

The disadvantages are: large amount of waste water, difficult to deal with; poor adaptability to raw materials, not suitable for processing gold-containing charcoal and materials with high arsenic and sulfur content; large consumption of reagents; difficult recovery of arsenic, sulfur and other base metals

However, there are still many problems for thiosulfuric acid leaching gold. The solution of thiosulfate gold leaching system is very complicated, and it also involves S 2 o 3 2- A series of redox reactions of its own, the chemical properties of thiosulfate are unstable, leading to some side reactions, the resulting large consumption of reagents and difficulties in recovery have been difficult to solve

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