Preparation method of carbonaceous material for adsorbing and recovering [Au (S2O3) 2] 3-ions

Abstract

The invention discloses a preparation method of a carbonaceous material for adsorbing and recovering [Au (S2O3) 2] 3-ions, and belongs to the field of hydrometallurgy and precious metal enrichment. The method for modifying the surface of the carbonaceous material comprises the following steps of: impregnating activated carbon with hydrochloric acid, washing the impregnated activated carbon with distilled water until the activated carbon is neutral, drying the washed activated carbon, uniformly mixing the dried activated carbon with a heterocyclic compound 5-mercapto-1-methyltetrazole accordingto a mass ratio, putting the obtained mixture into a high-pressure reaction kettle, carrying out a reaction, washing the obtained reaction product with deionized water, and drying the washed reactionproduct to obtain modified activated carbon. The heterocyclic compound is adopted to modify the activated carbon, so that the surface property of the carbon material is obviously changed, and the carbon material can be effectively used for adsorbing and recycling gold in thiosulfate leachate. The method has the advantages of simple process, short modification time, good adsorption effect, green and environment-friendly modification process, unchanged adsorption effect in an alkaline environment and the like.

Description

technical field [0001] The invention relates to a method for adsorption and recovery of [Au(S 2 o 3 ) 2 ] 3- The invention discloses a method for preparing an ionized carbonaceous material, belonging to the fields of hydrometallurgy and precious metal recovery. Background technique [0002] Because of its unique physical and chemical properties, gold plays a pivotal role in human production and life. In the wet extraction process, the cyanide method is widely used in the extraction of gold and is currently the main method for extracting gold. However, cyanide is a highly toxic substance, which poses great risks to the staff and the environment during the production process. . Thiosulfate gold extraction technology is non-toxic, less polluting, low cost, low corrosiveness of leachate, and can handle carbonaceous gold ore, copper-bearing gold ore and complex sulfur-bearing gold ore that are difficult to be effectively treated by cyanidation. And other advantages are cons...

AI Technical Summary

Problems solved by technology

However, in the thiosulfate gold extraction process, the use of activated carbon to recover gold in the thiosulfate leaching solution is still a problem, which may be attributed to the large volume and high charge of the gold thiosulfate complex ion, which makes activated carbon Gold recovery for thiosulfate method is difficult to achieve

[0003] In order to improve the effect of activated carbon on [Au(S 2 o 3 )2] 3- The adsorption capacity of complex ions is low, so some people start to modify the surface of activated carbon, such as adding 1-2 times the amount of cyanide to the thiosulfate gold immersion solution, and [Au(S 2 o 3 ) 2 ] 3- Convert to [Au(CN) 2 ] - Can be effectively adsorbed by activated carbon, which works well, but this method uses cyanide, which may pose a potential hazard to the environment

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