从酸浸石煤的萃取液中沉淀多聚钒酸铵

Research of Precipitation Poly ammonium Vandate from Extraction Solution of Acid leaching Bone Coal

进行了酸浸石煤萃取液铵盐直接沉钒的工艺研究 ,对沉钒的主要影响因素 ,如加铵系数、溶液pH值、沉钒时间、温度等均进行了详细实验 ,得出了合理的沉钒工艺参数 :在pH =4.0 ,加铵系数 3 5 ;沉钒时间 6 0～ 90min ,以及温度不低于 80℃的条件下 ,从含钒 16～ 2 0g/L的萃取液中沉钒 ,沉钒率可达 98%以上 ,产品质量达国家标准。研究还表明 ,由于SO4 2 -,CO3 2 -,Na+,Cl-等的影响 ,从酸浸石煤萃取液沉钒与从水浸液沉钒相比 ,一些工艺参数如pH、KNH3

The process of preciptiation poly ammonium Vanadate from the extraction solution of acid leading bone coal was researched. The best technology parameters were obtained through tests as follows:(1)the pH is about 4 0;(2) the coefficient of ammonification K =3.5; (3) the reaction time is about 60～90 min;(4) the precipitation temperature is not less than 80℃. Under the conditions the preciptation rate is more than 98% to the extraction solution containing 16～20 g/L V 2O 5, and the purity of V 2O 5 is up to trade standard.At the same time, the research indicate,because of the effect of SO 4 2- ,CO 3 2- ,Na +,Cl - etc, the precipitation process from the extraction solution of acid leaching bone coal is different in some facts such as pH, K NH 3 ,in compare with that from water leaching solution.