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 60～90 min， 以及温度不低于 80℃的条件下，从含钒 16～20 g/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 SO42-，CO32-，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 等有较大差别。
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.
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