硫酸镁为原料制备三水碳酸镁晶须的研究

Preparation of Nesquehonite Whisker Using Magnesium Sulfate as Material

以Mg SO_4·7H2O和Na_2CO_3为原料制备了三水碳酸镁晶须,考察了Mg SO_4浓度、Mg SO_4和Na_2CO_3摩尔加料比例、反应时间以及反应温度对产物的影响,并对产物进行了分析和表征。确定了适宜的反应条件为温度50℃、Mg SO_4浓度1.2 mol/L、Mg SO_4和Na_2CO_3摩尔比1∶1.2、反应时间40 min,此条件下,镁离子的转化率可达82.35%。当Na_2CO_3浓度升高、反应时间延长、反应温度升高时,三水碳酸镁会向碱式碳酸镁转变。同时也探索了以白钠镁矾作为镁源制备三水碳酸镁晶须的条件,并进行了母液循环工艺的设计。

The nesquehonite whisker was prepared with MgSO4·7H2O and Na2CO3 as raw materials in this paper. The effect of concentration of magnesium sulfate,raw material ratio,reaction time and temperature on the products was investigated. Samples were analyzed and characterized in this work. The results indicate that the optimum conditions to synthesize the nesquehonite whisker with well crystallization are under 50 ℃ for 40 min with 1. 2 mol / L magnesium sulfate and raw material ratio of 1∶1. 2. Under this condition,conversion of magnesium ions can reach 82. 35%. The nesquehonite will transform into basic magnesium carbonate with the increase of reaction time, temperature and concentration of Na2CO3. Meanwhile,the condition for preparation of the nesquehonite whisker by bloedite and the process design of mother liquor circulation were studied.