从低浓度溶液提取钼铼工艺研究

Study on Technology of Extracting Rhenium Molybdenum from Low Concentration Solution

阐述了从低浓度溶液中提取钼铼的优化工艺,利用N235萃取剂对铼钼的高选择性,通过从高酸硫酸体系共同萃取铼钼,同时利用铼钼的溶解度差异,对铼钼进行浓缩冷冻结晶分离,得到的粗铼酸铵作为下一步提取4N铼酸铵的主要原材料,从一次铼酸铵结晶母液中富集钼进行酸沉,得到粗钼酸铵脱铼脱杂,再次深度酸化二次萃取进一步选择性萃取富集钼,最终从反萃液中提取钼。该工艺钼的富集比大,对从高酸、高杂质的低浓度含钼含铼溶液中提取分离钼铼具有一定的参考价值。

In this article, the optimized technology of extracting rhenium Molybdenum from low concentration solution wasdescribed. The high selectivity of rhenium Molybdenum by N235 extractant was studied. By extracting rhenium Molybdenum from highacid sulphuric acid system together with the difference of solubility of rhenium Molybdenum, the enriched rhenium was separated byconcentrated frozen crystallization. Ammonium rhenate was taken as the main raw material for extracting 4N rhenium ammonium asthe next step. Again deep acidification secondary extraction further selective extraction enriched Molybdenum, and finally extractedMolybdenum from the reverse solution. The enrichment ratio of Molybdenum has certain reference value for extracting and separatingrhenium Molybdenum from the solution of low concentration of high acid and high impurity.