Coal Gangue Ceramsite Rotary Kiln

Using coal gangue rotary kiln production ceramsite raw materials is to use the coal gangue raw materials and other ore minerals calcined process such as processing, its main process including raw material processing, granulating and hot working, the coal gangue ceramsite production line in the granulating process can be divided into dry process and grinding into a ball.
1. Dry process: the raw materials collected by two or three broken, sieved into the required size of the raw material can be. This process is simple, less investment, but only for the quality of very uniform hard raw materials, cannot be mixed with admixture method to adjust the nature of raw materials.
2. Powder into the ball method: The granulation process for raw material quality is not uniform, poor expansion. The raw materials processing and granulation process, including coarse crushing, drying, grinding and ball, the process is complex, a large investment, but its biggest advantage is that according to the design requirements, mixed with additives to adjust the chemical composition, type, excellent grade of ceramsite.
In the coal gangue rotary kiln thermal processing technology, including drying, preheating and roasting and cooling three processes. The expansion of the raw material ball depends mainly on the heating rate of 200-600 ℃ preheating section, the faster the heating rate, the better the material expansion; with the following; With the temperature increase, the softening of the material in the expansion zone (temperature 1100 to 1200 ℃) to complete, then the internal gas escape, the formation of pressure, to promote the ball expansion. Preheating and roasting are the most important processes of ceramic firing, but the cooling process also has a great impact on the quality of the ceramsite. In general, the calcined ceramsite is rapidly cooled to 1000-700 ° C at the highest temperature of the expanded zone and slowly cooled at 700-400 ° C to avoid large stresses in crystallization and cure, up to 400 ° C rapid cooling.
Coal gangue through the crusher after processing, can be processed in the raymond mill size, and then through the raymond mill grinding to 200 mesh, into the biaxial mixer, and add a certain amount of material in accordance with the mixing, through the granulator after the material is granulated, it enters the rotary kiln and is calcined, and then the material is cooled and processed by a cooler.