China Nonferrous Metallurgy

High nickel matte is an important intermediate product in the nickel metallurgical process. By using nickel matte, nickel products such as ferronickel, electrolytic nickel and nickel sulfate can be mutually transformed and balanced in the market, which is of great significance for the steady development of nickel industry. A large number of leaching residues containing nickel, copper, cobalt, gold, silver, platinum, palladium and other precious metals are produced from high matte nickel after nickel hydrometallurgical extraction, which has great comprehensive utilization value. Researchers have solved the key technologies of separation and extraction of valuable components of high nickel matte leaching residue, and realized the development of the enterprise from the original single electrolytic nickel production workshop to an industrial park for comprehensive recovery of nickel, copper, cobalt and precious metals such as gold, silver, platinum and palladium. In recent years, driven by the increasingly strict environmental protection policies and the low-carbon transformation of metallurgical process, technologies such as hot acid pressure leaching for nickel reduction in residues, oxygen pressure leaching instead of rotary kiln roasting to treat the residues after copper extraction, and resource utilization of sodium sulfate wastewater are further proposed to optimize and upgrade the existing process and improve the quality and efficiency. This paper mainly introduces the current situation of the metallurgical process of high nickel matte leaching residue, analyzes the existing problems, expounds the latest progress of the improved process, metallurgical principle and industrial practice, and provides reference for relevant enterprises.