Application of anthraquinone-2-sodium sulfonate in cyaniding and leaching high-grade gold in oxidized ore

Abstract

The invention relates to application of anthraquinone-2-sodium sulfonate in cyaniding and leaching high-grade gold in oxidized ore, in particular to application of anthraquinone-2-sodium sulfonate as a catalyst for oxidizing and slowly releasing H2O2 in the cyaniding and leaching reaction of gold. The invention can be realized on the traditional equipment and has the advantages of low cost of used anthraquinone-2-sodium sulfonate, convenient preparation and wide raw material source, and a product of leaching reaction does not influence the following treatment operation. As far as ore property is concerned, the anthraquinone-2-sodium sulfonate is used for catalyzing and leaching gold and has higher competitiveness on treating high-grade gold oxidized ore obtained after carrying out preoxidation treatment (oxidation roasting, pressure heating oxidation and bacterial oxidation) on floating gold concentrate ore of coated type vulcanized gold ore.

Description

technical field [0001] The invention relates to a method for leaching gold by cyanide, which is to apply sodium anthraquinone-2-sulfonate in the method as an oxidation and slow-release H 2 o 2 catalyst. Background technique [0002] With the continuous mining of gold resources, the easy-to-handle gold mines are increasingly exhausted, so the utilization and development of refractory gold mines will become a key issue in the development of my country's gold industry. [0003] Encapsulated sulfide gold ore (gold wrapped in sulfide mineral lattice) is the most typical refractory gold ore. The typical treatment process is to pre-process the sulfide ore gold concentrate obtained from the flotation (enrichment of gold) of the raw ore. Oxidation (oxidative roasting, autoclave oxidation and bacterial oxidation) to destroy the sulfide mineral lattice to expose the gold particles, and then oxygenate the high-grade gold (50-120g / t) in the oxidized ore (compressed air or pure oxygen)...

AI Technical Summary

Problems solved by technology

[0004] The cyanide leaching reaction of gold is to dissolve the gold in the mineral material in the alkaline cyanide medium with the participation of oxygen. At present, the method of adding oxygen to the slurry is generally used. This method is suitable for processing low-grade mineral materials. However, when dealing with high-grade mineral materials, due to the limited amount of dissolved oxygen in the slurry, and the speed at which oxygen transfers from the gas phase into the mortar and diffuses to the surface of the gold particles is too slow, it cannot meet the requirements of high-grade minerals. The requirement of gold for oxygen supply causes the leaching speed of gold to be slow, the leaching rate is low and the consumption of cyanide is large; "Sand Metallurgy Engineering" 1993Vol. The experimental research situation of "Application in China", the test shows that the liquid oxidant hydrogen peroxide (H 2 o 2 ) can shorten the leaching time, increase the leaching rate of gold and reduce the consumption of cyanide, but its oxidizing property is too strong. When the dosage is large, it can not only oxidize gold, but also oxidize the leaching agent cyanide, and even make some gold The particles are passivated due to excessive oxidation. With the increase of the amount of hydrogen peroxide, the leaching of gold first increases and then decreases. Therefore, when using H 2 o 2 When assisting gold leaching, a corresponding control system must be equipped to control the H in the slurry. 2 o 2 concentration (this is the H 2 o 2 The key to the immersion method), but the cost of the control system is relatively high, so its application is limited