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中文摘要：
以MnSO4和NH4HCO3为原料，采用低温化学沉淀法制备出了粒度主要为5-6μm的单分散MnCO3球形颗粒．通过扫描电镜研究了各种反应条件如温度、pH值、MnSO4和NH4HCO3浓度等对MnCO3颗粒形貌和粒度的影响，并初步探讨了其可能的生长机理．结果表明，溶液的pH值是影响MnCO3颗粒形貌的关键因素，当pH值在8．0-7．0范围内减小时，MnCO3颗粒形貌由立方形向球形转变．随着反应温度的降低，MnCO3颗粒的分散性趋好，其形貌也逐渐趋于形成均一的球形颗粒，但粒径增大．在实验范围内，NH4HCO3浓度控制在0．1—0．3mol／L有利于球形MnCO3颗粒的生成，MnSO4浓度在0．05—0．4mol／L变化对产物的形貌影响不大．XRD分析证实了沉淀产物为MnCO3晶体，属三方晶系，方解石晶型．
英文摘要：
Monodisperse spherical MnCO3 particles were prepared by low temperature chemical precipitation method using manganese sulfate and ammonium bicarbonate as raw materials, and the diameters of the mierospheres were mainly 5-6μm. The effects of temperature, pH, concentration of MnSO4 and NH4HCO3 on the morphology and size of MnCO3 particles were investigated, and characterized by scanning electron microscope. The growth mechanism of the particles was also discussed, The results show that the solution pH value was the key factor in controlling the morphology of MnCO3 particles. When the pH was decreased from 8.0 to 7.0, the morphology of MnCO3 particles was transformed from cubic to spherical shape. With reducing reaction temperature, the dispersibility of MnCO3 particles became better and their shape also gradually trended towards unification. But the size of the particles became larger. In the experimental range, the morphology and size of MnCO3 particles had no obvious effect when MnSO4 concentration was changed from 0.05 to 0.4 mol/L. It was beneficial to the formation of spherical MnCO3 particles when NH4HCO3 concentration was between 0.1 and 0.3 mol/L, XRD patterns indicated that the precipitates was MnCO3 crystals with trigonal system, calcite orystalloid.
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