对熔炼铁捕集物采用两段逆流浸出工艺富集铂族金属进行研究。结果表明，在铁捕集物粉粒度为–0.425 mm，一段浸出温度为常温，浸出硫酸浓度为1.7~1.8 mol/L，固液比(S：L)=1：10，反应时间为0.5 h；二段浸出温度为75℃，浸出硫酸浓度为2 mol/L，S：L=1：50，反应时间为4 h。经此两段浸出后，铂族金属的平均富集倍数为70.6，铂族金属回收率大于99.8%。
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.
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