从酸浸石煤的萃取液中沉淀多聚钒酸铵

进行了酸浸石煤萃取铵盐直接沉钒的工艺研究，对沉钒的主要影响因素，如中按系数、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60～90min，以及温度不低于80℃的条件下，从含钒16～20g/L的萃取液中沉钒，沉钒率可达98%以早，产品质量达国家标准。标准还表明，由于SO∧2-4，CO∧2-3，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等较大差别。

Research of PrecipitationPoly-ammonium Vandate from Extraction Solution of Acid-leaching Bone Coal

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 V2O5， and the purity of V2O5 is up to trade standard.At the same time, the research indicate,because of the effect of SO42-,CO32-,Na+,Cl- etc, the precipitation process from the extraction solution of acid-leaching bone coal is different in some facts such as pH, KNH3 ，in compare with that from water-leaching solution.