| The process of iron trapping has been used in industry to recover platinum group metals from secondary resources, and the trapping process is carried out in electric furnace or plasma furnace. The concentrates obtained from plasma melting have high concentrations of silicon, leading to the formation of dense, inert and corrosion- resistant iron alloy. It is necessary to remove silicon first to facilitate the following dissolution process. The main silicon removal technologies include alkali melt solution-leaching method and oxidation-separation method. The enrichment material produced from electric furnace smelting has high hardness and is difficult to be broken, and high pressure atomizatio -acid dissolution, fragmentation - acid dissolution, electrolysis or other processes are adopted for deep enrichment. In this paper, the research status of deep enrichment technology of platinum group metal-containing ferroalloy has been reviewed, focusing on the comparison in the advantages and disadvantages of the main technologies. With the increasing demand for platinum group metals in various industries, greater recovery rate will be required. Therefore, it is important to further improve the present recovery technology. |
