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以轻烧白云石粉料为原料,采用二次碳化法,通过控制碳化终止pH值、热解温度和碳化时间等条件制备高纯碱式碳酸镁。研究了碳化时Ca2+、Mg2+浓度与pH值的关系,建立了它们之间的数学关系模型,计算出一次碳化的最佳碳化终止pH值为7.27,实验得出的一次碳化的最佳碳化终止pH值为7.20,相对误差为0.27%,实验结果与计算结果吻合;二次碳化以Mg2+浓度不变为终止条件,此时溶液pH值在7.0左右。运用X射线衍射仪对碱式碳酸镁样品进行物相表征,结果表明其分子式为4MgCO3 Mg(OH)2 4H2O。通过化学分析得到的碱式碳酸镁中MgO含量为42.25%,CaO含量为0.03%,Fe含量为0.001%,明显优于中国化工行业标准(HG/T 2959—2010)的优等品指标。
Abstract：A high purity basic magnesium carbonate was prepared by a twice-carbonation method with a light-burned dolomite powder as a raw material.The carbonation terminates pH,pyrogenation temperature,carbonization time and other conditions were controlled in the process.A model for the relationship between the ion(i.e.,Ca2+,Mg2+) concentration and the pH during the carbonization was proposed.The theoretical carbonation terminates pH value obtained by the model is 7.20,which is similar to the experimental result.The termination condition of twice-carbonation is defined as Mg2+concentration does not change,and the solution pH is thus 7.0.The result of basic magnesium carbonate sample characterized by X-ray diffraction(XRD) indicates that the formula is 4MgCO3 Mg(OH)2·4H2 O,which contains MgO of 42.25%,CaO of 0.03% and Fe of 0.001%.
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基本信息:
中图分类号:TQ132.2
引用信息:
[1]王志强,刘家祥,饶发明.以轻烧白云石为原料二次碳化法制备高纯碱式碳酸镁[J].硅酸盐学报,2013,41(10):1437-1441.
2013-09-24
2013-09-24
2013-09-24