In gypsum board industry, the rotor on DSJ Series Drying Hammer crusher can break up and throw the desulfurized gypsum slag, whose water content is no more than 28%. During this process, the gypsum slag exchanges the heat with the intake hot air of 550°C, and then the max water content of the material is 1%, which goes into riser from outlet duct and then hot air takes the material into the next process. This machine can also be used to dry and crush filtered cake in cement industry and calcium carbide slag in environmental protection.