石煤浸出液分离富集钒的研究

采用氯化钙沉钒-碳酸铵溶出从石煤浸出液中分离富集钒, 探讨了氯化钙用量、反应时间和反应温度对沉钒率的影响以及碳酸铵用量、反应时间和反应温度对钒溶出率的影响。结果表明: 在氯化钙与五氧化二钒摩尔比为5∶1, 反应时间为40 min, 反应温度为70 ℃条件下, 沉钒率为97.2%; 在碳酸铵与五氧化二钒摩尔比为6∶1, 反应时间为2 h, 反应温度为90 ℃条件下, 钒溶出率为98.0%; 煅烧后得到纯度为99.0%的五氧化二钒, 钒的总回收率大于90%。

Separation and Enrichment of Vanadium from Stone Coal Leaching Solution

The vanadium was enriched from leaching solution of stone coal by using calcium chloride to precipitate vanadium followed by adding ammonium carbonate to dissolving out vanadium. The effect of calcium chloride dosage, reaction time, reaction temperature on precipitation rate of vanadium, effect of ammonium carbonate dosage, reaction time, reaction temperature on dissolution rate of vanadium were all investigated. Results showed that the precipitation rate of vanadium reached 97.2% with the molar ratio of calcium chloride and vanadium pentoxide as 5∶1, reaction time of 40 min, at a reaction temperature of 70 ℃, and the dissolution rate of vanadium reached 98% with the molar ratio of ammonium carbonate and vanadium pentoxide as 6∶1, reaction time of 2 h, at a reaction temperature of 90 ℃. The vanadium pentoxide with purity of 99.0% was produced after calcination, with total recovery of vanadium greater than 90%.