低品位石煤钒矿两段逆流酸浸提钒的研究

Study on Two-Stage Countercurrent Acid Leaching of Low-Grade Stone Coal Vanadium Ore for Vanadium Extraction

以陕南某低品位石煤钒矿为原料,在添加含氟助浸剂的条件下采用两段逆流硫酸浸出提钒。结果表明,在石煤钒矿磨矿细度为―0.074 mm占40%,助浸剂为1%NaClO_(3)+3%2^(#)含氟助浸剂,硫酸用量为22%,两段逆流浸出温度为90℃,一段浸出时间为1 h,二段浸出时间为2 h的条件下,钒浸出率可以达到94.95%。该流程可有效降低硫酸用量,提高钒浸出率,节省药剂,并能适当简化后续提钒工艺。

A low-grade stone coal vanadium ore in Southern Shaanxi was used as raw material to extract vanadium by two-stage countercurrent sulfuric acid leaching under the condition of adding fluorine-containing leaching aid.The results show that under the conditions of a grinding fineness of stone coal vanadium ore of―0.074 mm accounting for 40%,a leaching aid of 1%NaClO_(3)+3%2^(#)fluorine-containing leaching aid,a sulfuric acid dosage of 22%,a two-stage countercurrent leaching temperature of 90℃,a leaching time of 1 h for the first stage,and a leaching time of 2 h for the second stage,the leaching rate of vanadium can reach 94.95%.This process can effectively reduce the amount of sulfuric acid,improve the vanadium lea-ching rate,save the agent,and simplify the subsequent vanadium extraction process.