两段逆流浸出从铁捕集物中富集铂族金属的研究

Study on Enrichment of Platinum Group Metals in Iron-Trapping Material Using Two-Stage Countercurrent Leaching

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 2mol/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.