对不同温度下煅烧成的苛性白云石进行了X射线粉晶分析,结合热分析结果,得出在750～800℃温度下煅烧成的苛性白云石镁质胶凝材料,其中的Mgo水化活性较大.在煅烧白云石的过程中,是结晶--化学反应为限制步骤,因此,要尽可能创设条件,加速化学反应的进行,并要尽可能控制好煅烧时间,以便抑制氧化镁的完全结晶.另外,分析计算了在利用临桂县白云石生产苛性白云石镁质胶凝材料时,不同粒度(5～250mm的多种粒度)的块状白云石在不同温度下完全离解所需要的煅烧时间.%The work of the XRD of the caustic dolomite prepared by different calcining temperatures had been done.According to the results of the XRD and DTA of the dolomite in the atmosphere of the CO2, we reached a conclusion that the MgO of the magnesia cementitious material of the caustic dolomite calcined at the temperature condition from 750℃ to 800℃ possessed larger hydration activity. In the process of calcining and decomposing the dolomite ore, the restrictive step was the crystallization and chemical reaction. The condition to quicken the chemical reaction should be consequently created as far as possible, and the calcining time should be controlled as far as possible to restrain the complete crystallization of the MgO in the caustic dolomite. In addition,the required calcining times to fully decompose the MgCOj in the big lump dolomites which were the paticles from 5mm to 250 mm had been obtained by the methods of the experiments,analysis and computations.
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