Mainly used for calcining cement clinker, lime, and ceramic particles, it is divided into two categories: dry method cement kiln and wet method cement kiln. Metallurgical and chemical kilns are mainly used for magnetization roasting of poor iron ore in steel plants in the metallurgical industry; Chromium and nickel iron ore oxidation roasting; Refractory material factory roasting high-grade gold ore and aluminum factory roasting clinker, aluminum hydroxide; Chemical plants roast minerals such as chromium ore sand and chromium ore powder.