采用氧化焙烧-酸浸法从高碳石煤中提钒试验研究

Extracting vanadium from high-carbon stone coal by oxidizing roasting-acid leaching method

针对广西某难浸高碳石煤,比较相同焙烧和酸浸条件下静态焙烧矿和流态化焙烧矿钒的浸出率,优化流态化焙烧矿的酸浸条件。研究结果表明:流态化焙烧矿酸浸钒的浸出率比静态焙烧矿酸浸钒的浸出率平均高24%,所以,在相同焙烧温度、时间下流态化焙烧较静态焙烧更利于钒的浸出;在液固质量比为0.8:1.0,二氧化锰添加量为3%和氢氟酸添加量为2%的条件下,得最佳酸浸条件,即酸矿质量比为0.4:1.0,浸出温度为150℃,浸出时间为6 h,在此最佳酸浸条件下,钒浸出率可达88.26%。

Based on refractory high-carbon stone coal of Guangxi,the leaching rate of vanadium of static roasting and fluidized roasting in the same roasting and acid leaching condition was compared.The results show that the leaching rate of vanadium of fluidized roasting-acid leaching method is averagely 24% higher than that of static roasting-acid leaching method.Therefore,fluidized roasting is more favorable to leach vanadium.The optimal acid leaching condition for vanadium extraction is as follows： acid-mine ratio 0.4：1.0,leaching temperature 150 ℃,leaching time 6 h at liquid-solid mass ratio 0.8：1.0,addition of manganese dioxide 3% and addition of hydrofluoric acid 2%.Under the optimal acid leaching conditions,the rate of leaching vanadium can reach 88.26%.