晶型控制剂对碳酸钙晶须合成的影响

Effect of Chemical Additives on the Synthesis of Calcium Carbonate Whiskers

分别以氢氧化镁和氯化镁作为晶型控制剂,采用碳酸化法制备碳酸钙晶须,利用扫描电镜和X射线衍射对产物的形貌、结构及矿物组成进行表征,从而得出晶型控制剂对合成碳酸钙晶须的影响。结果表明：当镁钙比小于1,反应温度为80℃,搅拌速度在100-130 r/min和二氧化碳通气量为70-100 mL/min时,氢氧化镁较之氯化镁更容易促进碳酸钙晶须的生成,所得的碳酸钙晶须多呈树枝状分布。

Calcium carbonate whiskers were respectively synthesized by carbonation method using magnesium hydroxide and magnesium chloride as chemical additives.The morphology,phase composition and structure of the product were characterized by SEM and XRD.And effect of chemical additives on the synthesis of calcium carbonate whiskers was analyzed.The results indicate that magnesium hydroxide is easier than magnesium chloride to promote the growth of calcium carbonate whiskers.And the dendrite whiskers can be acquired when the ratio of magnesium and calcium involved in the reaction solution is less than 1,the temperature of reaction is 80 ℃,the agitation rate is 100～130 r/min and the flux of CO2 is 70～100 mL/min.