Pulverized coal is the residue after complete combustion under specified conditions. It is formed by a series of complex reactions such as decomposition and combination of coal mine materials under certain conditions. It is a derivative of minerals in coal mine. When pulverized coal is heated in a restricted atmosphere, the yield of VOCs is called volatile matter, which is mainly composed of water, hydrocarbon oxides and hydrocarbons. However, physical adsorption water and carbon dioxide in pulverized coal are not included in the volatile matter. The volatile content of pulverized coal is one of the main indexes to judge the quality of pulverized coal. The high quality pulverized coal has a high volatile content. When casting, it is easy to form reductive gases in the cavity, and a large amount of bright carbon is precipitated. The casting with smooth surface can be obtained. Yi. As a result, the gas content of molding sand increases, the casting is liable to produce porosity, insufficient pouring and other defects, the volatile content should generally be controlled at 32-38%.
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