陕西某钒矿石钙化焙烧-酸浸工艺研究

摘要

研究了采用钙化焙烧—酸浸工艺从陕西某钒矿石中浸出钒，考察了焙烧温度、添加剂种类与用量、焙烧时间、空气通量、矿石粒度、浸出条件等对钒浸出的影响。试验结果表明，在矿石粒度－100目、焙烧温度920℃、加入4％ CaCO3＋2％ CaCl2作添加剂、空气通量50 m3／（m2· h）条件下焙烧4 h ，然后在硫酸总用量8％、液固体积质量比1．5∶1、常温条件下2段逆流浸出3h，钒浸出率达70％以上。%Recovery of vanadium by calcified roast‐acid leaching w as studied .T he effects of particle size of ore ,roasting additive ,roasting temperature ,roasting time ,air flux and leaching conditions on leaching rate of vanadium w ere examined .T he results show that vanadium leaching rate can reach 70%under the conditions of particle size of -100 mesh ,roasting temperature of 920 ℃ ,using 4% CaCO3 and 2% CaCl2 as roasting additive ,air flux of 50 m3/(m2 · h) ,roasting time of 4 h ,sulfuric acid dosage of 8% ,liquid‐to‐solid ratio of 1 .5∶1 ,two‐stage countcurrent leaching at room temperature ,leaching time of 3 h .