Harmless disposal method of cyanidation tailings

[0002] Because gold mines use cyanide gold extraction technology in the production process, a large amount of cyanide tailings will be produced, and these cyanide tailings contain a large amount of pollutants, such as sulfur, copper, arsenic, mercury and highly toxic cyanide ; Except that a small amount of cyanide tailings can be used, a considerable amount of cyanide tailings is only stored or directly landfilled, which not only occupies a large amount of land resources, but also has the hidden danger of polluting surface water, groundwater and soil. It has great safety hazards and environmental protection hazards to the surrounding environment; at present, cyanide tailings have been listed by the country as HW33 hazardous waste in the "National Hazardous Waste List", with obvious pollution characteristics and serious pollution. The environmental protection pressure of the state and enterprises There is an urgent need to adopt practical control technology to eliminate the harm of this kind of hazardous waste to the environment

[0003] At present, the technology for treating cyanide tailings is mainly flotation method, supplemented by autoclave method, chlorination roasting method, molten salt roasting method, reduction roasting method, oxidation method, solidification method, preparation of Portland cement, etc. ; The flotation method (CN201410228170.5, CN201410099597.X, CN201510055236.X) is mostly carried out under weak acid conditions. - Unstable, resulting in bad working environment, and need to undergo multiple flotation treatments; autoclave method (CN201510023812.2) is mainly carried out in autoclave or autoclave, which requires long-term high temperat...