Method for achieving oxygen pressure acid leaching efficient beneficiation of gold and platinum group metal concentrate

Abstract

Disclosed is a method for achieving oxygen pressure acid leaching efficient beneficiation of gold and platinum group metal concentrate. The method comprises the steps that most of copper, nickel and iron and a little sulfur in secondary-cured copper-nickel alloy with rare and noble metals beneficiated through pyrometallurgy are removed by the use of a potential-controlled chlorination leaching method; copper and nickel recovery is conducted on filter liquid which is obtained after a chlorination residue is filtered, and a residue with beneficiated noble metal is desulfurized by the use of a sodium sulfite solution; impurities such as nickel, copper, iron and sulfur in a desulfurized residue which is obtained through filtering after desulfurization are further removed by the use of an oxygen pressure acid leaching method; pressure leaching liquid contains a little platinum and palladium, the platinum and the palladium in the pressure leaching liquid are processed by the use of QP-TU resin through exchange adsorption, and beneficiated platinum and palladium liquid enters the follow-up platinum refining and palladium refining working procedures; and nickel, copper and sulfur in a pressure leaching residue are almost removed, and the percentage content of the rare and noble metals is increased from 0.06% in the prior art to 25%-55%. The method is simple in technology and high in beneficiation ratio and recovery rate of the rare and noble metals, environmentally friendly, free of poison gas and exhaust gas and quite beneficial to follow-up separation and purification.

Description

technical field [0001] The invention belongs to the technical field of rare precious metal hydrometallurgy, and specifically relates to an oxygen pressure acid leaching method for efficiently enriching gold and platinum group metals by combining potential-controlled chlorination leaching, oxygen pressure acid leaching and anion resin exchange adsorption noble metal ion technology. The full hydrometallurgical method of mine. Background technique [0002] In the process of beneficiation and pyrometallurgy of copper-nickel sulfide ore, the gold and platinum group metals associated with the original ore are continuously enriched, and the secondary copper-nickel sulfide alloy after magnetic separation enriches most of the rare and precious metals. Go to the precious metal smelter for smelting. The element composition of secondary sulfide copper-nickel alloy is roughly: Ni 62-69%, Cu 16-22%, Fe 1.5-3.5%, Co 0.6-1.2%, S 6-12%, Au 200-370g / t, Pt 600-900g / t, Pd 300-500g / t, Rh 16-30...

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Problems solved by technology

[0003] Sulfur-containing leaching slag can only be used after desulfurization. After desulfurization, more than 90% of the sulfur in the slag can be removed. Since the sulfur element has many allotropes, the composition of the desulfurization slag is complex, and some sulfur is still difficult to remove. , the sulfur content of the slag is unstable, and the sulfur element in the slag accounts for 14-20% of the total mass. The desulfurization slag with high sulfur content will bring difficulties to the subsequent rare and precious metal separation and purification process, and the sulfur particle size in the concentrate is extremely high. Fine, in each reaction of precious metal separation and purification, sulfur will cover the foam surface of the material liquid, change the surface tension of the foam, make it difficult for the foam to burst, and the foam envelops the ma

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