Micro-dilatancy refractory mortar for rotary kiln

Abstract

The invention discloses micro-dilatancy refractory mortar for a rotary kiln. The micro-dilatancy refractory mortar for the rotary kiln comprises the following components in parts by weight: 50-90 parts of high-alumina bauxite, 1-10 parts of aluminum oxide fine powder, 1-10 parts of silicon dioxide fine powder, 0.5-4 parts of attapulgite powder, 1-10 parts of cyanite powder, 0-10 parts of andalusite powder, 0.05-5 parts of zirconium oxide powder, 0-1 part of ethyl cellulose, 0.01-1 part of FDN, 0.05-1 part of sodium metasilicate and 8-30 parts of water. The micro-dilatancy refractory mortar for the rotary kiln disclosed by the invention undergoes micro-dilatancy in volume after burning at a high temperature, and has excellent high-temperature performance and erosion resistance; and the defect of damage to a furnace liner caused by relative displacement of a kiln body in a rolling process due to a large gap between the liner and a rotary kiln furnace jacket since the contraction or liner change rate is lower than 1 percent after burning of ordinary mortar is overcome. During use, the swelling capacity can be adjusted by controlling the proportion of each component in the micro-dilatancy refractory mortar for the rotary kiln according to the practical situation of a refractory brick, and the influence of quality fluctuation of the refractory brick on the building quality of the furnace liner is avoided.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a micro-expansion refractory mud for a rotary kiln. Background technique [0002] For the furnace body that rotates at high temperature such as a rotary kiln, it is required that after the refractory lining is built, the overall volume will expand slightly under the hot working condition, so that the refractory lining and the furnace shell can be combined more closely during rolling operation, so as to Reduce the damage to the refractory lining caused by the relative movement of the gap between the two, so as to ensure the overall life of the kiln. In order to control the overall expansion performance of the furnace lining, it is a common technical means in this field to develop a micro-expansion refractory material as a lining refractory brick. But on the one hand, because the slight volume change of refractory bricks often causes a large volume change ...

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Problems solved by technology

But on the one hand, because the slight volume change of refractory bricks often causes a large volume change of the furnace lining as a whole, the quality fluctuation of refractory bricks has a great impact on the masonry quality of the furnace lining, and the refractory bricks as finished products cannot be adjusted during on-site construction; on the other hand On the one hand, since the shrinkage of the brick joint mud between refractory bricks is also an important aspect of the shrinkage of the furnace lining, it is not easy in actual production to control the overall expansion performance of the furnace lining by changing the volume expansion performance of the lining refractory bricks. master