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Fine coal briquetting is a complex process which must deal with different types of fine-grained materials. It is important to determine a range of factors that will affect the process, such as raw material hardness, moisture content, grain composition, internal and external friction, unit pressure, type of coal briquette machine, etc.
Fine coal has a low susceptibility to bind during the briquetting process. Therefore, it is desirable to change the properties of the raw materials, which can be achieved by adding binding materials. A typical binder may contain hydrolyzed flour, lime, starch, molasses, and some acids. The resulting compound is formed in a coal briquette machine to obtain coal briquettes, which are then dried and conditioned to produce a solid fuel for combustion.