Novel high-viscosity high-fluidity magnesium refractory mortar

Abstract

The invention discloses novel high-viscosity high-fluidity magnesium refractory mortar, which is prepared from the following raw materials in parts by weight: 100 parts of mixed material, 3 to15 parts of dry anhydrous magnesium sulfate, 0.5 to 1.5 parts of sodium carboxymethyl cellulose, 0.5 to 1.5 parts of sodium tripolyphosphate, 0.3 to 1.0 part of calcium lignosulphonate, 0.5 to 3.0 parts of sodium polyacrylate with the concentration of 40% and 0.5 to 1.5 parts of high-temperature asphalt powder. The novel high-viscosity high-fluidity magnesium refractory mortar has the advantages of being high in bonding strength, excellent in workability, stable in volume, good in high temperature performance, good in erosion resistance and washing-out resistance and capable of avoiding bleeding; the viscosity of the refractory mortar is obviously improved, and the fluidity of the refractory mortar is improved on the premise of not increasing the water addition amount; thus, the purpose of prolonging the service life of brick bodies, linings and a furnace is achieved.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a refractory mud used in building refractory bricks, in particular to a new type of high-viscosity and high-fluidity mud used in building various high-temperature kilns and thermal equipment. Magnesia refractory clay. Background technique [0002] When building magnesia brick linings in high-temperature kilns and thermal equipment, a large amount of magnesia refractory mud is required to fill the brick joints, so that the bricks are closely bonded to each other, the overall surface is smooth and the load is balanced, and the integrity of the brick lining is enhanced. , improve the ability of the brick lining to resist the erosion and erosion of molten liquid and slag as a whole, and synchronize the life of brick joints and lining, so as to prolong the life of the kiln and improve the overall performance of the kiln. Therefore, it is very impor...

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Problems solved by technology

[0003] The existing magnesia refractory clay uses magnesia fine powder as raw material, and mostly uses sodium carboxymethyl cellulose, sodium tripolyphosphate, dextrin, and calcium lignosulfonate as additives. The balance is not easy to control, and it is easy to have problems such as poor construction, and there are problems such as flow, low viscosity, and difficulty in spreading. After high-temperature baking, the shrinkage is large, the strength is low, and the brick joints are not fully filled. The service life of the kiln

[0004] The greater the water-cement ratio of the fire clay, the longer the time for the fire clay to set and harden, the more free water, the longer the time for the water to separate from the fire clay, and the easier it is for the fire clay to bleed; the amount of admixture in the fire clay is too much, or Too much retarding component will cause a large amount of bleeding and segregation of the freshly mixed fire clay, and a large amount of free water will leak out of the fire clay surface, affecting the setting and hardening of the fire clay, and the water retention performance of the fire clay will decrease, resulting in serious bleeding

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