高长径比三水碳酸镁晶须的合成研究

Research on Synthesis of Nesquehonite Whisker with High Aspect Ratios

本文以MgCl2.6H2O和NH4HCO3作为反应物料,采用低温液相合成法制备出三水碳酸镁晶须。考查了Mg2+初始浓度、NH4HCO3溶液的滴加速度、搅拌速度及表面活性剂种类等因素对三水碳酸镁晶须的长度及长径比的影响。研究结果表明:在Mg2+初始浓度为0.5 mol/L、NH4HCO3的滴加速度5 mL/min、搅拌速度为120 r/min、选用KH2PO4作表面活性剂的试验条件下,可以合成出长度325μm、直径8.25μm,长径比高达32的三水碳酸镁晶须产品。

In this paper,epsom salt and magnesium bicarbonate were used as reaction materials,low-temperature aqueous solution polymerization was applied to synthesize the nesquehonite whisker and the impact of initial concentration of Mg2＋,dropping acceleration of NH4HCO3 solution,stirring speed,and other factors on the length and diameter ratio of nesquehonite whisker was investigated.The research found that it is possible to synthesize nesquehonite whisker with high aspect ratios under 0.5 mol/L initial concentration of Mg2＋,5 mL/min drop acceleration of NH4HCO3 solution,stirring speed of 120 r/min and surface-active agent with KH2PO4.