Dolomite sand (snowflake white) 40-80 mesh, when heated to 700-900 ℃, dolomite decomposes into a mixture of carbon dioxide, calcium oxide and magnesium oxide. It is known as caustic magnesite and easily reacts with water. Put it in 1500 ° When calcined at room temperature C, MgO turns into ettringite and Cao turns into crystalline a-cao. The structure is compact, the water resistance is strong and the fire resistance is as high as 2300 ° C。

Dolomite deposits in China are distributed in carbonate series. The older the strata are, the more the sediments are, and most of them are concentrated in the bottom layer of Sinian. For example, Liaohe Group in Northeast China, Sangzi group in Inner Mongolia and Jianou group in Fujian all have dolomite deposits. Secondly, Sinian and Cambrian dolomite deposits are relatively extensive, such as Liaodong Peninsula, Eastern Hebei, Inner Mongolia, Shanxi, Jiangsu and other places also have large deposits. Carboniferous and Permian dolomite deposits are mostly distributed in Hubei, Hunan, Guangxi, Guizhou and other places.