石煤钒矿拌酸熟化浸出新工艺

New Extraction Process of Vanadium from Stone Coal by Acid Curing

对南方某石煤钒矿进行拌酸熟化浸出,考察了矿物粒度、加水量、硫酸用量、熟化温度、熟化时间及水浸工艺参数对钒浸出的影响,并研究了H2O在熟化过程中的行为.得到最佳工艺流程和结果为:先将石煤钒矿磨至125μm以下,加10%水润湿,再加入20%浓硫酸拌匀,140℃下保温熟化3h,按液固比1.5mL/g水浸2h,钒浸出率达87.8%.石煤矿物中含钒云母结构在熟化过程中被破坏,形成难溶的SiO2,浸出液中SiO2浓度为0.09g/L,利于后续处理.

Using the vanadium-containing stone coal from south China as raw material, the acid curing process of vanadium recovery was studied. The effects of process parameters, such as granularity, water addition, dosage of sulfuric acid, curing temperature, curing time and leaching solution, on the leaching of vanadium were examined, as well as the behavior of 1-120 in the acid curing process. The optimal conditions were obtained as follows： ore granularity 125 μm, water addition 10%（ω）, dosage of sulfuric acid 20%（ω）, curing temperature 140℃, curing time 3 h, leaching time 2 h, and ratio of liquid to solid 1.5 mL/g. Under the optimum conditions, the leaching rate of vanadium was 87.8%. The structure of micas mineral in the ore was destroyed, and SiO2 formed in the curing, which was difficult to digest. The concentration of SiO2 in leaching solution was 0.09 g/L, being beneficial to subsequent processing.