| The enrichment process of platinum group metals (PGMs) in the PGM-bearing iron-trapping material was investigated by using the “two-stage countercurrent leaching” technology. When particle size of iron-trapping material was –0.425 mm, the experimental condition for the first stage leaching was room temperature, sulfuric acid concentration of 1.7~1.8 mol/L, solid and liquid ratio (S:L) of 1:10 and leaching for 0.5 h, while that for the second stage leaching was 75℃, sulfuric acid concentration of 2 mol/L, solid and liquid ratio of 1:50 and leaching for 4 h. After two stages leaching, PGMs were enriched about 70.6 times in the iron-trapping material and at least 99.8 % of PGMs could be recovered. |
