硼泥的熔碱浸出脱硅

Desilication of Boron Mud Using Molten Sodium Hydroxide Media

为实现硼泥的综合利用,采用熔碱介质对硼泥进行脱硅处理,考察了反应时间、反应温度及碱矿质量比对硼泥中二氧化硅提取率的影响.在此基础上,通过正交实验,确定最佳的脱硅反应条件.研究结果表明,最佳的脱硅反应条件:反应时间20 min,反应温度550℃,碱矿质量比为1.75∶1.此时,硅的提取率可达91.9%,硼泥脱硅渣中氧化镁的质量分数为92.04%,利用X射线衍射分析仪(XRD)和扫描电镜(SEM)对硼泥脱硅渣进行了表征.

To accomplish the comprehensive utilization of boron mud,the desilication of boron mud was studied using molten sodium hydroxide media. The effect on silicon dioxide extraction ratio caused by the factors,such as reaction time,reaction temperature and mass ratio of sodium hydroxide to boron mud,was analyzed. The optimum reaction condition of desilication was obtained through the orthogonal tests. The results showed that the extraction ratio of silicon dioxide reaches 91. 9% and Mg O content reaches 92. 04% in the solid residuals under the optimum reaction conditions of desilication. The reaction time is 20 min,the reaction temperature is 550 ℃ and the mass ratio of sodium hydroxide to boron mud is 1. 75 ∶ 1. The solid residuals were characterized by XRD and SEM.