Environment-friendly treatment and resource utilization method for cyanide tailings

A technology for harmless treatment and cyanidation of tailings, applied in chemical instruments and methods, process efficiency improvement, solid separation, etc. The effect of improving yield and product quality, and shortening the reaction process

Inactive Publication Date: 2019-01-04
灵宝黄金集团股份有限公司黄金冶炼分公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only recovers the iron in the tailings better, other valuable metals are difficult to recover effectively, and the method of roasting is still used, which increases the recovery cost
[0007] In the existing methods for recovering cyanide tailings, there are common problems such as high energy consumption and complicated operation, and the valuable elements in the cyanide tailings cannot be completely separated, especially for the lead element in the slag. Leaching, which in turn affects the subsequent separation and application of the leach residue, reducing the added value of the product

Method used

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  • Environment-friendly treatment and resource utilization method for cyanide tailings

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Effect test

Embodiment 1

[0054] Such as figure 1 As shown, the method for harmless treatment and resource utilization of cyanide tailings provided in this embodiment includes the following steps:

[0055] (1) Mix 50g cyanide tailings with 45.61g FeSO 4 ·7H 2 O and 250mL sodium hydroxide solution (sodium hydroxide concentration is 50wt%) are mixed in autoclave, seal reactor, start timing when being heated to 120 ℃, leave kettle after reacting 7h under stirring state, filter, obtain leaching solution and reaction slag ;

[0056] (2) Wash the reaction slag obtained in step (1) with water, place it in an oven and dry it at 80°C for 24 hours, perform magnetic separation after grinding, and obtain iron concentrate and silicon-rich material, and use the cyanide leaching method to leach the iron concentrate recovery of gold and silver;

[0057] (3) Enrich the lead in the leach solution obtained in step (1) to a concentration of 20g / L, then reclaim lead by cooling and crystallization, add 1wt% lead oxide c...

Embodiment 2

[0060] The method for harmless treatment and resource utilization of cyanide tailings provided in this embodiment comprises the following steps:

[0061] (1) Mix 50g cyanide tailings with 45.61g FeSO 4 ·7H 2 O and 350mL sodium hydroxide solution (sodium hydroxide concentration is 40wt%) are mixed in the autoclave, pass into nitrogen to evacuate the air, start timing when heated to 90°C, leave the still after stirring for 12h, filter to obtain the leachate and reaction slag;

[0062] (2) Wash the reaction slag obtained in step (1) with water, put it in an oven and dry it at 80°C for 24 hours, and then conduct magnetic separation after grinding to obtain iron concentrate and silicon-rich material. Prepared as sodium silicate product;

[0063] (3) enrich the lead in the leaching solution that step (1) obtains to concentration to be 35g / L, then adopt the mode of cooling crystallization to reclaim lead, add the lead oxide crystal seed of 0.5wt% in the cooling process, the coolin...

Embodiment 3

[0066] The method for harmless treatment and resource utilization of cyanide tailings provided in this embodiment comprises the following steps:

[0067] (1) Mix 25g cyanide tailings with 20.78g FeCl 2 And 350mL sodium hydroxide solution (sodium hydroxide concentration is 10wt%) mixes in the autoclave, passes into nitrogen and evacuates the air, starts timing when heating to 180 ℃, leaves the kettle after reacting 5h under stirring state, filters, obtains leachate and Reaction slag;

[0068] (2) Wash the reaction slag obtained in step (1) with water, put it in an oven and dry it at 80°C for 24 hours, and then conduct magnetic separation after grinding to obtain iron concentrate and silicon-rich material. The material is prepared as a silicon fertilizer product;

[0069] (3) Enrich the lead in the leaching solution obtained in step (1) to a concentration of 15g / L, then reclaim lead by cooling and crystallization, add 5wt% lead oxide crystal seeds during the cooling process, a...

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Abstract

The invention relates to an environment-friendly treatment and resource utilization method for cyanide tailings. The method comprises the steps that the cyanide tailings are mixed with ferrous salt and an alkali solution, heating is conducted for a reaction, and leaching liquor and reaction residues are obtained after solid-liquid separation; the reaction residues are magnetically separated to obtain iron ore concentrate and a silicon-rich material; lead in the leaching liquor is enriched and then recycled, and a lead product and recycling liquor are obtained. According to the method, the cyanide tailings are utilized to react with the ferrous salt in the alkali solution in a liquid state, Fe2O3 in the cyanide tailings is converted into Fe3O4, iron is separated from silicon by using a magnetic separation method, and the iron ore concentrate and the silicon-rich material are obtained. Through the synergistic effect of the ferrous salt and the alkali solution, the lead in the cyanide tailings is efficiently leached out, and the leaching rate of the lead is 90% or above. By means of the method, recycling of various valuable constituents in the cyanide tailings is achieved, the methodhas the advantages of being low in reaction temperature, short in process, high in resource utilization rate and the like, and the method is high in economic benefit and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and mineral processing, and in particular relates to a method for harmless treatment and resource utilization of cyanidation tailings. Background technique [0002] Cyanide tailings are typical solid wastes in the gold hydrometallurgy industry, which are produced in large quantities, difficult to treat, and difficult to comprehensively utilize. It has high fineness and small specific gravity, and is easy to form dust. In addition to gold and silver, the content of sulfur, iron and heavy metals copper, lead, zinc, cadmium, etc. in the cyanide tailings, as well as the residual cyanide from flotation are relatively high, and the residual cyanide may also cause the dissolution of heavy metals in the cyanide tailings , It poses a serious threat to the surrounding environment, atmosphere, surface and groundwater resources of the tailings pond. The development of a harmless treatment and resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B13/00B03C1/02
CPCB03C1/02C22B7/008C22B13/045Y02P10/20
Inventor 朱光锦宋耀远李会强王国栋张红玲赵军辉陈辉霞徐红彬
Owner 灵宝黄金集团股份有限公司黄金冶炼分公司
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