Harmless disposal method of cyanidation tailings

A technology of harmless treatment and cyanidation of tailings, which is applied in the direction of chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of high anti-corrosion ability, pollution, long time, etc., and achieve cyanide removal Good effect, avoid the effect of polluting the environment

Active Publication Date: 2018-09-11
NORTHEASTERN UNIV
19 Cites 14 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[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...
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Abstract

A harmless disposal method of cyanidation tailings comprises the following steps: (1) using cyanidation tailings as a raw material, or adding an additive CaO into cyanidation tailings as mixed raw materials; (2) heating the raw material or the mixed raw materials to 250-450 DEG C for pyrolysis and carrying out thermal insulation for less than or equal to 90 min so as to obtain calcine; and (3) directly using calcine as backfill treatment, or extracting pyrite through flotation. The method of the invention has a good cyanogens removal effect, and the cyanidation tailings which have undergone low-temperature pyrolysis meets requirements of common solid wastes.

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  • Harmless disposal method of cyanidation tailings

Examples

  • Experimental program(8)

Example Embodiment

[0026] Example 1
[0027] The cyanide tailings are cyanide tailings produced by a company in Shandong, the mass percentage of water is 12.4%, and the solid content contains Fe 41.41%, S 48.40%, SiO 2 5.72%, Al 2 o 3 1.48%, CaO 0.47%, CN — Content 340mg/kg;
[0028] Prepare cyanide tailings as raw material;
[0029] Heat the raw material to 250°C for pyrolysis, and heat it for 90 minutes after reaching 250°C to complete the pyrolysis to remove cyanide and obtain calcined sand;
[0030] Use calcined sand directly for backfill treatment;
[0031] After testing, it was found that the total cyanide in the cyanide tailings (in CN — Count) gradually decreases, and at the end of pyrolysis, the pyrolysis material basically does not contain cyanide, CN — It is almost 0, and the cyanide removal rate reaches more than 99%.

Example Embodiment

[0032] Example 2
[0033] Method is with embodiment 1, and difference is:
[0034] (1) The mass percentage of water in the cyanidation tailings is 16.9%, and the solid content contains Fe 29.92%, S 33.30%, SiO by mass percentage 2 24.95%, Al 2 o 3 5.25%, CaO 1.15%, CN — Content 500mg/kg;
[0035] (2) Heat the raw material to 350°C for pyrolysis, and heat it for 15 minutes after reaching 350°C to complete the pyrolysis;
[0036] (3) Add water to the calcined sand to make a pulp with a mass concentration of 35%; add flotation agent xanthate, foaming agent and inhibitor to the pulp, and then carry out flotation; wherein the amount of xanthate added is based on the amount of xanthate in the pulp The concentration is 0.5×10 -5 mol/L, the addition of foaming agent is 100mg/L by the concentration of foaming agent in the ore pulp, and the addition of suppressor is 100g/t calcine; Described foaming agent is 2# oil, and described The inhibitor is water glass; the flotation temperature is 15° C. and the time is 20 minutes to obtain flotation concentrate and flotation tailings; the flotation concentrate is press-filtered until the mass percentage of water is 10% to obtain pyrite material.

Example Embodiment

[0037] Example 3
[0038] Method is with embodiment 1, and difference is:
[0039] (1) The mass percentage of water in the cyanidation tailings is 23.7%, and the solid content contains Fe 29.92%, S 33.30%, SiO by mass percentage 2 24.95%, Al 2 o 3 5.25%, CaO 1.15%, CN — Content 1160mg/kg;
[0040] (2) Heat the raw material to 450°C for pyrolysis, and complete the pyrolysis after reaching 450°C.
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