【摘要】：為了提高石英砂的雜質(zhì)去除率,采用磁選加混酸酸洗工藝,并研究了酸洗反應(yīng)動(dòng)力學(xué)模型,對石英砂酸浸除雜進(jìn)行理論指導(dǎo)。試驗(yàn)結(jié)果表明,鐵去除率隨著粒徑減小而增大,150~180μm石英砂磁選效果最好。通過研究不同酸洗組合,發(fā)現(xiàn)混酸(硝酸+鹽酸+氫氟酸)對鐵的去除效果最好;使用混酸(V_酸∶V_水=1∶1),90℃水浴反應(yīng)360 min,石英砂中鐵去除率可達(dá)88.3%,鐵雜質(zhì)含量降為24.76μg/g,達(dá)到了精制石英砂的純度要求。利用液固多相未反應(yīng)核模型擬合發(fā)現(xiàn),石英砂的酸洗過程控速步驟為產(chǎn)物內(nèi)擴(kuò)散控制,計(jì)算得出反應(yīng)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，

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