以MgSO4·7H2 O和Na2 CO3为原料制备了三水碳酸镁晶须,考察了MgSO4浓度、MgSO4和Na2 CO3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℃、MgSO4浓度1.2 mol/L、MgSO4和Na2 CO3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Na2 CO3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 ·7H2 O and Na2 CO3 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 Na2 CO3 . Meanwhile, the condition for preparation of the nesquehonite whisker by bloedite and the process design of mother liquor circulation were studied.
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