Abstract: The leaching solution of stone coal roasted with sodium chloride was used to study the effects of pH value, operation pressure and vanadium concentration on vanadium recovery with nanofiltration, and the behavior of Cl- in nanofiltration process was also examined. The results show that for the nanofiltration, under the optimal condition of operation pressure at 10.0~12.5 kg/cm2 and pH value at 5.16~6.15, the concentration of vanadium measured as V2O5 in the solution can be concentrated to above 35 g/L. The rejection rate of vanadium increases with pH from 3.16 to 6.15, and the peak rate of 92% is reached at pH 6.15. NH4VO3 was precipitated in the rejected solution by adding NH4Cl in the stoichiometric proportion of 2.2. The product V2O5 with purity 98.6% was obtained by thermal decomposition of the precipitated NH4VO3 at 500℃ for 1 h.

Key words: vanadium, stone coal, sodium chloride, roasting, nanofiltration

摘要： 采用石煤氯化钠焙烧浸出液为原料，研究了驱动压力、料液pH值及钒浓度对钒纳滤浓缩效果的影响，并考察了Cl-在纳滤过程中的行为. 结果表明，在驱动压力10.0~12.5 kg/cm2和pH值5.16~6.15的优化条件下，料液中的钒(V2O5)可纳滤浓缩到35 g/L以上. pH值6.15时，钒的截留率最高，达92%. 浓缩液按沉钒化学计量的2.2倍加入NH4Cl，沉淀得到的NH4VO3经500℃煅烧1 h得到的V2O5产品纯度为98.6%.

关键词: 钒, 石煤, 氯化钠, 焙烧, 纳滤