Method for treating cyanided tailing slurry through hot-press oxidized liquid of gold extracting technology in gold industry

Abstract

The invention belongs to the technical field of pollutant treating methods and specifically relates to a method for treating cyanided tailing slurry through hot-press oxidized liquid of a gold extracting technology in the gold industry. Aiming at the environmental problem of cyanided tailings obtained by an existing treating method, waste slurry and waste liquid generated by a hot-press pre-oxidizing work section of the gold extracting technology of the gold industry are utilized to achieve the purpose of treating waste by waste; enterprises are prevented from purchasing harmless treatment agents, operation cost of gold production enterprises is greatly reduced, and important significance in clean production, energy conservation, emission reduction and sustainable development of the wholegold industry is achieved.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment methods, and in particular relates to a method for treating cyanide tailings slurry with a hot-pressed oxidation solution in a gold extraction process in the gold industry. Background technique [0002] Due to the use of cyanidation gold extraction process in the production process of gold mines, a large amount of cyanide tailings slurry will be produced. The cyanide tailings produced by the dehydration of this part of the cyanide tailings slurry contain a large amount of highly toxic substance cyanide, except for a small part Except for the utilization of cyanidation tailings, most of the tailings can only be stored, occupying a large amount of land resources. These stockpiled cyanide tailings not only pollute the surface water, groundwater and soil, but also there are many tailings pools where the cyanide tailings are stored are overdue or overloaded, which makes the tailings stock a...

AI Technical Summary

Problems solved by technology

These stockpiled cyanide tailings not only pollute the surface water, groundwater and soil, but also there are many tailings pools where the cyanide tailings are stored are overdue or overloaded, which makes the tailings stock a great safety hazard. Once the dam collapses and leaks , will have a great impact on the surrounding environment

[0003] At present, there are many studies on the harmless treatment of cyanide tailings pulp at home and abroad. The treatment method is basically to destroy cyanide. The methods include alkaline chlorination, inco method, hydrogen peroxide oxidation, etc.; The method used in China, the process of removing cyanide is to quantitatively put chlorine-based oxidants into the cyanided tailings slurry, control the reaction pH between 10-11, the reaction speed is very fast, the product is cyanate, and the cyanate is under certain conditions. However, the alkaline chlorination method cannot destroy the ferrocyanide complex and the ferricyanide complex, nor can it form a precipitate to remove it, and at the same time, the excess hypochlorite returns to cyanide The leaching process will continue to destroy the added cyanide, resulting in the accumulation of chloride ions that will corrode the equipment; the Inco method uses a chemical containing sulfur dioxide and oxygen to form an oxidation system to oxidize and easily release cyanide. At the same time, ferrocyanide complex and ferricyanide The complex is partially removed in the form of precipitation, and the treatment effect is relatively stable, but a certain amount of copper salt needs to be added as a catalyst, and there are certain restrictions on the pH, and the cyanide composition in the tailings slurry of some gold enterprises is complex Cyanide complexes cannot be removed by the Inco method; the hydrogen peroxide oxidation method uses the strong oxidation characteristics of hydrogen peroxide to oxidize and easily release cyanide. Complexes and ferricyanide complexes are less effective

All of the above treatment methods require enterprises to purchase treatment agents, which virtually increases the operating costs of enterprises. Moreover, since most gold production enterprises need to reuse process water, adopting these methods will introduce harmful impurities into the production process of enterprises and affect the production of enterprises. normal production