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Taking the high-grade nickel matte obtained from the smelting and converting of Jinbaoshan platinum-palladium concentrates as the research object, a hydrometallurgical process of one-stage atmospheric pressure leaching followed by two-stage pressure leaching was used to study the leaching behavior of nickel, cobalt, copper, iron and sulfur, as well as the refining and enrichment of precious metals. The effects of leaching endpoint pH value, leaching temperature, liquid-solid ratio, oxygen partial pressure, reaction time, initial acidity and other factors were investigated. The results show that the control conditions for atmospheric pressure leaching are leaching temperature of 70 °C, leaching time of eight hours, liquid-solid ratio of 6, and the control conditions for the first stage pressure leaching are solution dosage of 500 mL (H2S04 10 g/L, Cu 3.19 g/L), liquid-solid ratio of 10, oxygen partial pressure of 0.2 MPa, leaching time of one hour, and reaction temperature of 150 °C. The control conditions for the second stage pressure leaching are solution dosage of 500 mL (H2SO4 40 g/L), liquid-solid ratio of 10, reaction temperature of 180 °C, oxygen partial pressure of 0.1 MPa, and reaction time of two hours. The leaching rate of nickel and copper in high-grade nickel matte can reach more than 99%, and platinum and palladium are basically not eached, and the enrichment degree of total content of Au, Ag, Pt and Pd is more than 88 times. [ABSTRACT FROM AUTHOR]

The multimetallic sulfur-based nickel resources are rich in nickel, cobalt, copper, and precious metals such as gold, silver, platinum, and palladium, offering significant comprehensive recovery value. Pressure leaching technology can effectively facilitate the dissolution of these metal ions into the solution, laying a foundation for subsequent separation and purification, thereby possessing significant application value in the field of nickel metallurgy. It is very important to study the metallurgical mechanism and multimetallic migration pathways of pressure leaching of multimetallic sulfur-based nickel resources for improving metal recovery, optimizing material balance and promoting technological innovation. In this study, based on industrial practice of pressure leaching applied to a certain nickel sulfide concentrate in Zambia, a high-grade nickel matte in Yunnan, and a sulfur-based nickel slag in Xinjiang, the dissolution characteristics and reaction principle of nickel, cobalt, copper, iron, and other precious metals such as gold, silver, platinum and palladium in the process of pressure leaching were analyzed. The multi-component separation and extraction technology based on pressure leaching was discussed. The aim is to provide data support and theoretical guidance for the design and optimization of pressure leaching process, and promote the efficient, clean and sustainable comprehensive utilization of multimetallic sulfur-based nickel resources. [ABSTRACT FROM AUTHOR]