石英砂磁
发布时间：2018-11-13 15:52
【摘要】：为了提高石英砂的杂质去除率,采用磁选加混酸酸洗工艺,并研究了酸洗反应动力学模型,对石英砂酸浸除杂进行理论指导。试验结果表明,铁去除率随着粒径减小而增大,150~180μm石英砂磁选效果最好。通过研究不同酸洗组合,发现混酸(硝酸+盐酸+氢氟酸)对铁的去除效果最好;使用混酸(V_酸∶V_水=1∶1),90℃水浴反应360 min,石英砂中铁去除率可达88.3%,铁杂质含量降为24.76μg/g,达到了精制石英砂的纯度要求。利用液固多相未反应核模型拟合发现,石英砂的酸洗过程控速步骤为产物内扩散控制,计算得出反应激活能Ea=51.73 k J/mol。
[Abstract]:In order to improve the impurity removal rate of quartz sand, the technology of magnetic separation and mixed acid pickling was adopted, and the kinetic model of acid pickling reaction was studied to guide the theory of acid leaching and impurity removal of quartz sand. The results show that the removal rate of iron increases with the decrease of particle size, and the magnetic separation efficiency of 150 ~ 180 渭 m quartz sand is the best. Through the study of different pickling combinations, it was found that mixed acid (hydrofluoric acid nitrate) had the best removal effect on iron. Using mixed acid (V _ acid: v _ water = 1:1), the iron removal rate of 360 min, quartz sand can reach 88.3 and the iron impurity content is reduced to 24.76 渭 g / g in 90 鈩，
本文编号：2329606
[Abstract]:In order to improve the impurity removal rate of quartz sand, the technology of magnetic separation and mixed acid pickling was adopted, and the kinetic model of acid pickling reaction was studied to guide the theory of acid leaching and impurity removal of quartz sand. The results show that the removal rate of iron increases with the decrease of particle size, and the magnetic separation efficiency of 150 ~ 180 渭 m quartz sand is the best. Through the study of different pickling combinations, it was found that mixed acid (hydrofluoric acid nitrate) had the best removal effect on iron. Using mixed acid (V _ acid: v _ water = 1:1), the iron removal rate of 360 min, quartz sand can reach 88.3 and the iron impurity content is reduced to 24.76 渭 g / g in 90 鈩，
本文编号：2329606
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