A method for enriching precious metals by pretreatment of iron sulfonic acid slag

Abstract

The invention discloses a method for enriching noble metals by pretreating iron matte acid slag, and belongs to the technical field of noble metal hydrometallurgy. The method comprises the following steps: firstly, performing water immersion treatment on the iron matte acid slag, and performing solid-liquid separation to obtain a water immersion liquid and water immersion slag; separating impurityelements such as copper, arsenic, antimony and nickel from the water immersion slag with a potential-controlled extract process to obtain an impurity removed liquid and impurity removed slag; desulfurizing the impurity removed slag with a sulphating roasting process to obtain high-grade noble metal gold mud, and then recovering noble metals such as gold and silver from the gold mud with a conventional method; separating valuable metal antimony from the mixed extract with a hydrolysis process to obtain an antimony oxychloride intermediate product and an antimony separated liquid; recovering copper from the antimony separated liquid, oxidizing the copper separated liquid and fixing arsenic; performing rotary evaporation treatment on the arsenic removed liquid to obtain a crude nickel salt product. Various metals in the iron matte acid slag can be effectively separated and recovered, the recovery rate of valuable metals is high, and harmful element arsenic in the slag can be effectivelytreated.

Description

technical field [0001] The invention belongs to the technical field of precious metal hydrometallurgy, and specifically relates to the separation of copper, arsenic, antimony, nickel, iron and other impurity elements from iron sulfonium acid slag through a wet process, so as to achieve the purpose of enriching precious metal gold and silver. The obtained valuable elements are comprehensively recovered, and the harmful element arsenic is harmlessly treated. Background technique [0002] Fine particles impregnate gold concentrates and gold concentrates containing harmful elements such as arsenic, antimony, and carbon. Controlling the low oxygen potential in the pyro-smelting process can make elements such as arsenic, antimony, lead, and zinc with low melting points volatile , mainly form oxides and escape in the form of flue gas. Silica, a small amount of iron and smelting additives mainly form slag phase. Iron matte, which has a good trapping effect on precious metals, is ma...

AI Technical Summary

Problems solved by technology

If the iron sulphonic acid slag is treated with the relatively mature sulfuration roasting process, a large amount of acidic fume will inevitably be generated, and at the same time, more harmful element arsenic will be taken away, and the arsenic will be dispersed in the roasting slag and flue gas. More importantly, Guo Xueyi et al. (Chinese Journal of Nonferrous Metals, 2010, 20(5): 990-998) reported that the subsequent leaching process of copper separation can partially disperse the precious metals, which is not conducive to the recovery of precious metals; the use of oxygen pressure leaching process can separate Impurity elements in precious metal materials, but for iron sulfonium acid slag, it is difficult to control the leaching valence state of antimony in the oxygen pressure leaching process, which increases the subsequent recovery process of antimony and brings greater difficulty in recovery

If iron sulphonic acid slag cannot be efficiently and comprehensively processed to recover multiple valuable metals and precious metals, it will affect the normal operation of the complex gold concentrate pyro-smelting process, and at the same time, valuable elements cannot be effectively recovered, affecting the profitability and normal operation of the enterprise

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