Harmless treatment method of cyanide-containing tailings

Abstract

The invention provides a harmless treatment method of cyanide-containing tailings, and belongs to the field of mine waste residue treatment. The harmless treatment method of the cyanide-containing tailings comprises the following steps that immobilization treatment is carried out on the cyanide-containing tailings through pretreatment, wheel grinding mixing and digestion steps; a consolidating agent and a cementing material are added into the cyanide-containing tailings after immobilization treatment to consolidate and prepare harmless filling materials; the harmless filling materials are cured, and the materials are piled into a tailing pond; and according to the pretreatment, multifunctional water-soluble polymer is added to the cyanide-containing tailings, and the mixture is sent into aconcentration tank, stir and filter pressing are carried out to obtain concentrated ore pulp. According to the harmless treatment method of the cyanide-containing tailings, the cyanide-containing tailings are used for preparing the filling materials which are not compatibilized, do not greatly shrink, have excellent compressive strength, do not have cyanide toxicity, and have good freezing-thawing resistance and heat resistance. The treatment method has mature process, high settling rate, large cyanide capture amount, cost saving, construction in all seasons, less reagent consumption, large treatment amount, continuous treatment, low energy consumption, and can realize sustainable development of economy, society and environment.

Description

technical field [0001] The invention belongs to the field of mine waste residue treatment, and in particular relates to a harmless treatment method for cyanide-containing tailings. Background technique [0002] Cyanide is a highly toxic substance, and the lethal dose to humans is 0.15-0.2g. A very small amount of cyanide can also poison fish and aquatic organisms to death. But practice has proved that cyanide is an effective and reliable gold extraction solvent, which has the characteristics of high recovery rate of gold extraction, strong adaptability to ore, simple operation method, and convenient production. Therefore, using cyanide to extract gold has become a commonly used method in gold production at home and abroad. Due to the cyanidation method, highly toxic cyanide must be added in the process, and a certain amount of residual CN will be produced in the pulp. - Therefore, a large amount of cyanide-containing wastewater and cyanide-containing tailings will inevitab...

AI Technical Summary

Problems solved by technology

There are few targeted treatment technologies for gold tailings, alkaline chlorination treatment and filter press dry stacking have disadvantages such as unstable treatment effects, limited tailings carrying capacity, and the need for long-term maintenance and management; biological methods and natural degradation methods have low concentrations , the process is slow; tailings re-election is to extract gold, silver, zinc, etc. from the tailings, which can improve the resource recovery rate and bring huge economic benefits to the enterprise, but there are small processing scales, low recovery rates, and secondary refining There is still a large amount of cyanide in the tailings, and there is a secondary pollution problem, which cannot fundamentally solve the tailings problem

[0005] Prior art such as CN104889134B discloses a method for treating cyanide-containing tailings slag in gold mines. It adopts a closed pulping process to adjust the tailings slag into slurry, and after adding M agent, deep oxidizer and catalyst to remove cyanide, the tailings slag is piled into the tailings. library, the process is simple, and the cyanide removal effect is good, but the amount of reagent used is large, the technology and equipment used are high, and the final treatment cost is high