The requirements of refractory materials for shaft kilns

refractory brick

① high temperature heat loss: refractoriness of not less than 1580 ℃ inorganic non-metallic materials and products called refractory materials. In the kiln under high temperature, do not soften, insoluble; in normal or abnormal circumstances, can maintain a certain structural strength and bulk density stability. This kind of refractory masonry lining of the kiln in order to maintain the normal operation and production.
② anti-acid and alkali chemical erosion: the material in the kiln of the calcination process, to go through a series of complex physical and chemical reactions, different parts of the acid gas or alkaline slag will erode the kiln lining. Especially in the firing zone, the reaction material in the high temperature liquid phase, the chemical effect of refractory material is more intense. So the material can not participate in chemical reactions, does not appear sticky phenomenon.
③ anti-material movement wear: shaft kiln calcination process, the material from top to bottom, from low temperature to high temperature, to the low temperature kept moving. The lining of the inner wall of the kiln body is always subjected to the movement of the material, especially the clinker formed after calcination is stronger and the wear of the lining is more serious. Therefore, masonry in the kiln body of the refractory material must have a strong anti-wear ability.
④ specifications of the size: refractory masonry quality of the kiln calcination process has an important impact. Shaft kiln is not round, calcined easily lead to "partial fire" phenomenon; brick surface uneven, contact is not close, in the kiln bottom position is unstable, due to thermal shock phenomenon will occur loose lining, reduce service life and kiln heat loss Increase and so on. Therefore, the shape and shape of the refractory brick must be standardized and accurate, which is to ensure the quality of the most basic conditions of masonry.

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