Low-density refractory fiber coating and preparation method thereof
A technology of refractory fiber and refractory fiber cotton, which is applied in the field of refractory fiber smear, can solve the problems of not meeting construction requirements, affecting construction efficiency, and large thermal conductivity, so as to reduce bulk density and dry line change rate, and improve adhesion Good effect, thermal insulation performance
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Embodiment 1
[0028] A low-density refractory fiber smear for a gasification furnace, consisting of 23% of refractory fiber cotton with a particle size of 20-0mm, 20% of hollow spheres, 36% of bonded clay of 0.074-0mm, and high-alumina bauxite powder of 0.074-0mm6 %, 0.088~0mm high alumina cement 12%, dextrin 0.5%, CMC 2.5% and sodium citrate 0.1%.
[0029] The low-density refractory fiber smear for the gasifier, the production process is as follows:
[0030] (1) Weigh the hollow sphere, bonded clay, high-alumina powder, high-alumina cement, binder and water reducer according to the above requirements, and then mix the weighed components evenly for later use;
[0031] (2) Select and weigh refractory fiber cotton, add it to the mixed material in step (1), stir evenly, and seal the package;
[0032] (3) When using, dry mix first, then add water while stirring, the amount of water is 70-80% of the total amount of materials, and stir until it can be spread.
Embodiment 2
[0034] A low-density refractory fiber smear for a gasification furnace, consisting of 35% refractory fiber cotton with a particle size of 20-0mm, 15% hollow spheres, 32% bonded clay with a diameter of 0.074-0mm, and high-alumina bauxite powder with a particle size of 0.074-0mm4 %, 0.088~0mm high alumina cement 10%, CMC4% and NNO0.5%.
[0035] The low-density refractory fiber smear is used for the gasification furnace, and the production process is the same as in Example 1.
Embodiment 3
[0037] A low-density refractory fiber smear for a gasification furnace, consisting of 50% refractory fiber cotton with a particle size of 20-0mm, 10% hollow spheres, 27% bonded clay with a diameter of 0.074-0mm, 8% high-alumina cement with a particle size of 0.088-0mm, Composed of HPMC5% and sodium tripolyphosphate 0.05%.
[0038] The low-density refractory fiber smear is used for the gasification furnace, and the production process is the same as in Example 1.
[0039] The smear mud prepared by the above method is smeared and molded in a standard mold of 160×40×40mm, and after drying at 110°C×24h, the bulk density and linear change rate are respectively reduced by 35%~45% compared with the products produced by the prior art. % and 40.0%~49.2%. The construction verification is carried out on the steel plate, and the results show that the product of the invention has good construction performance, and after drying, it is closely bonded to the steel plate and has strong cohesiv...
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Abstract
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