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Process of nickel citrate for catalyzing thiosulfate to leach gold

A technology of thiosulfate and citrate, applied in the field of hydrometallurgy, can solve the problems of large consumption of leaching agent, increased consumption, reduced gold leaching rate, etc., so as to achieve no threat to the environment and human health, reduce consumption, Environmentally friendly effects

Active Publication Date: 2015-07-22
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For specific types of ores, the use of certain additives can reduce S 2 o 3 2- Consumption has good effects, but additives have poor applicability to ore types
Iron EDTA or iron oxalate substituted copper ammonia catalyzed reduction of S in pure solution system 2 o 3 2- The consumption effect is remarkable, but in the slurry system containing pyrite, pyrrhotite, etc., S 2 o 3 2- Consumption rises instead
Nickel ammonia replaces copper ammonia catalysis, which can still significantly reduce S in the actual pulp system 2 o 3 2- Consumption, and does not reduce the gold leaching rate, but NH 3 use will pose a threat to the environment
[0004] In order to solve the large consumption of leaching agent and the NH 3 Threat to the environment and other issues, the present invention is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: Add nickel sulfate to 0.01mol / dm in the leached pulp as described in Comparative Example 1 3 , add citric acid to 0.02mol / dm 3 , instead of ammonia water and copper sulfate in the comparative example, other leaching conditions are the same as in the comparative example 1, the gold leaching rate is 85.9%, and the consumption of sodium thiosulfate is reduced to 3.8kg / t 焙砂 .

Embodiment 2

[0019] Embodiment 2: Add nickel sulfate to 0.03mol / dm in the leaching pulp as described in comparative example 1 3 , add sodium citrate to 0.06mol / dm 3 , instead of ammonia water and copper sulfate in the comparative example, other leaching conditions are the same as in the comparative example 1, the gold leaching rate is 86.2%, and the consumption of sodium thiosulfate is reduced to 4.2kg / t 焙砂 .

Embodiment 3

[0020] Embodiment 3: Add nickel sulfate to 0.05mol / dm in the leaching pulp as described in comparative example 1 3 , add citric acid to 0.10mol / dm 3 , instead of ammonia water and copper sulfate in the comparative example, other leaching conditions are the same as in the comparative example 1, the gold leaching rate is 86.7%, and the consumption of sodium thiosulfate is reduced to 4.8kg / t 焙砂 .

[0021] Raw material condition 2: The raw material is an oxidized gold ore with a gold grade of 3.7g / t, sulfur and copper contents of 0.01% and 0.03% respectively, and the main gangue component is SiO 2 .

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PUM

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Abstract

The invention discloses a novel process of nickel citrate for catalyzing thiosulfate to leach gold. The novel process is characterized in that the nickel citrate catalysis is used for substituting the traditional copper ammonia catalysis, namely the nickel sulfate and the citric acid (or sodium citrate) are added in the thiosulfate gold leaching pulp to substitute the adding of the copper sulfate and the ammonia. By adopting the process, the oxygenolysis effect of the Cu(NH3)4<2+> and S2O3<2-> is eliminated so that the consumption of the thiosulfate is obviously reduced; and besides, the use of the ammonia is cancelled so as to avoid the risk of the NH3 on the environment. The gold leaching rate is equal to that of the copper ammonia catalysis.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a technique for leaching gold with nickel citrate catalyzing thiosulfate. Background technique [0002] Gold is an important strategic material and plays an important role in national economic development and social progress. The cyanidation method occupies a dominant position in the gold extraction industry for a long time because of its advantages such as simple process and low cost. However, because cyanide is highly toxic and seriously threatens the environment, the development of non-cyanide gold leaching technology has been widely valued. The thiosulfate method has the advantages of less corrosion to equipment for gold leaching in alkaline medium, non-toxic leaching agent and low price, and is widely considered to be the most potential non-cyanide gold leaching method. After long-term research, it is found that the main obstacle to its industrial application is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/14
CPCY02P10/20
Inventor 徐斌杨永斌李骞姜涛周思洁刘晓亮李光辉郭宇峰陈许玲范晓慧黄柱成张元波许斌彭志伟甘敏
Owner CENT SOUTH UNIV
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