从失效有机铑催化剂中富集铑的新工艺研究

针对失效有机铑催化剂,利用还原-磨选工艺富集铑。在还原过程中,添加剂促进铁晶粒长大并富集铑,再通过磁选分离富集含铑的铁精粉。研究表明最佳工艺参数为:还原温度1200℃,还原时间6 h,添加剂配比10%,煤粉配比5%,球磨时间45 min,磁场强度1.28×105 A/m。利用X射线衍射对磁选铁精粉进行了分析,磁选后主要物相为金属铁、铑,除去了大部分脉石。最终得到铁精矿品位88.67%,回收率92.74%,铑回收率为92.08%。本工艺具有还原温度低、收率高等特点,为失效有机铑催化剂富集提供一种途径。

A New Technique for Rhodium Enrichment from Wasted Organic Catalysts Containing Rhodium

For wasted organic catalysts containing rhodium, rhodium was enriched by reduction-grinding and separation. Additives promote iron grain growth and metallic iron enrich rhodium during the reduction process, and then iron ore concentrate containing rhodium is enriched by magnetic separation. The study obtains the optimum process parameters, i.e. the reduction temperature is 1200 oC, the reduction time 6 h, the additive ratio 10%, the reductant dosage 5%, the milling time 45 min, and the magnetic field strength 1.28×105 A/m .The magnetic separated concentrate were characterized by X-ray diffraction (XRD). The results show that a large amount of gangue is removed by magnetic separation, and the concentrate mainly contains iron and rhodium. At last the grades of the total iron in the iron concentrate are 88.67%, and the recovery rates of iron and rhodium are 92.74% and 92.08%, respectively. This process has the advantages of low temperature and high recovery, and it is regarded as a kind of the general efficient enrichment technique for wasted organic catalysts containing rhodium.