某伊利石型含钒石煤矿石复合添加剂焙烧—联合浸出提钒工艺研究

Study on Extracting Vanadium by Roasting with Composite Additive-Combined Leaching from an Illite-Type Vanadium-containing Stone Coal

陕西某伊利石型石煤钒矿石中钒主要以类质同象形式存在于伊利石和榍石中,其分布率分别为90.32%和5.37%。为给该石煤矿中钒利用提供依据,进行了复合添加剂焙烧—水浸—酸浸联合工艺提钒试验。结果显示:在复合添加剂NaCl+K_2SO_4用量为4%+16%、焙烧温度为800℃、焙烧时间为60 min条件下进行焙烧,焙烧产品在水浸温度为90℃、液固比为4 mL/g、浸出时间为120 min条件下水浸,水浸渣在H_2SO_4浓度为4%、液固比为4 mL/g、浸出温度为80℃、浸出时间为60 min条件下进行酸浸,获得了水浸率为85.06%、酸浸率为7.94%,总浸出率为93.00%的指标。试验结果可以为该含钒石煤矿石的开发利用提供参考。

The vanadium in a certain illite stone coal in Shaanxi is mainly distributed in illite and titanite in the form of isomorphism, and its distribution rate is 90.32% and 5.37%, respectively. In order to provide basis for the use of vanadium in the coal mine, the experiment of composite additive calcination-water leaching-acid leaching process was carried out. Results showed that under the conditions of composite additive NaCI＋ K2SO4 dosage of 4% ＋ 16%, roasting temperature of 800 ℃, roasting time of 60 min, roasted products with water leaching temperature 90 ℃, liquid-solid ratio of 4 mL/g, water leaching duration 120 min, water leaching residual with sulfuric acid concentration of 4%, liquid-solid ratio of 4 mL/g, acid leaching temperature of 80 ℃, acid leaching duration 60 min, the water and acid leaching rates of vanadium is 85.06% and 7.94% respectively, the total vanadium leaching rate was up to 93.00%. The experimental results can provide references for the development and utilization of the vanadium bearing stone coal.