纳米微晶碱式碳酸锌的制备

Preparation of nano-microcrystalline alkali zinc carbonate

以ZnSO4·7H2O和NH4HCO3为原料，掺入一定质量的MgSO4·7H2O，制备纳米微晶碱式碳酸锌粉体．分析Zn、Mg元素的质量分数，通过XRD检测粉体晶粒度．结果表明，少量Mg的掺入可降低碱式碳酸锌的晶粒度，随Mg的质量分数增加，Zn的质量分数依次减小，粉体晶粒度也呈减小趋势；随着反应温度的升高，粉体的晶粒度逐渐增大；加快搅拌速度，粉体的晶粒度减小．得出最佳制备工艺条件是Mg的质量分数1．11％～1．36％，反应温度60℃，搅拌速度350-400r／min．在此工艺下，可制得Zn的质量分数为56．18％，Mg的质量分数为1．31％，晶粒度为9．5nm的碱式碳酸锌．

Taking ZnSO4 · 7H2O and NH4 HCO3 as raw materials and mixing them with a certain amount of MgSO4 · 7H2O, the powder of nano-crystalline alkali zinc carbonate was prepared. The mass-fraction of Zn and Mg was analysed and the grain size of the powder was measured with XRD. The result showed that, a small amount of Mg doped could lower the grain size of the alkali zinc carbonate, increase the Mg mass-fraction, reduce the Zn mass-fraction gradually, and make the grain size of the powder tend to de- crease. With the reaction temperature increasing, the grain size of powder would increase gradually, with the stirring speed increasing, the grain size of the powder would decrease. The optimum preparing condition was as follows： the mass-fraction of Mg was 1. 11%-1. 36%, the best reaction temperature was 60 ℃, and the optimum mixing speed was 350-400 r/min. By doing so, the grain size of prepared alkali zinc carbonate was 9.5 nm, Zn’s mass-fraction was 56. 18%, and that of Mg was 1.31%.