Phosphate combined low-aluminum Guimo brick and preparation method thereof

Abstract

The invention relates to a phosphate combined low-aluminum Guimo brick and a preparation method thereof. The brick comprises 30-59% of 3-1mm high-aluminum bauxite, 11-28% of 1-0.088mm high-aluminum bauxite, 0-20% of 0.044<mm bauxite micropowder, 0-18% of 0.088<mm alumina micropowder, 5-19% of 0.088<mm calcined kaolin, 5-16% of 0.088<mm silicon carbide, 8-22% of 20-15mu m silicon micropowder and 3-10% of phosphate binder. The preparation technique comprises the following steps: proportionally mixing the raw materials, adding the phosphate binder, aging, grinding, mechanically forming, drying, heating the dried green brick to 450-600 DEG C, and keeping the temperature for 2-8 hours. The phosphate combined low-aluminum Guimo brick can utilize the low-grade raw material, and has the advantages of favorable alkali resistance and better high-temperature resistance.

Description

Technical field [0001] The invention relates to a refractory material production technology, in particular to a phosphate-bonded low-alumina-silica molybdenum brick and a preparation method thereof. It is mainly used in the lining working layer of cement kiln tail smoke chamber, kiln door cover, tertiary air duct, calciner and kiln decomposition zone. Background technique [0002] At present, ordinary alkali-resistant bricks are mostly used as refractory materials in the working layers of low-temperature areas such as cement kiln tail smoke chambers and tertiary air ducts. However, with the large-scale of new dry-process cement equipment, the improvement of fuel combustion efficiency, and the increase of unit output, the temperature of the entire rotary kiln system has been greatly improved. 1100°C; the air temperature of the decomposition zone in the kiln is increased from 1000°C to 1300°C. Because of the rise in temperature, ordinary alkali-resistant bricks are no longer...

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Problems solved by technology

In addition, as the daily output of cement continues to increase, the alkali concentration in the preheater circulation system continues to increase. Ordinary clay alkali-resistant bricks cannot withstand the erosion and erosion of high-temperature alkali steam, resulting in a decline in the alkali resistance of materials.

Because ordinary alkali-resistant bricks cannot meet the current conditions of use, frequent maintenance is required, which increases maintenance costs and is forced to use expensive refractory materials such as silica bricks, but this practice does more harm than good

Although the service life of refractory materials in the area of ​​use is improved and maintenance costs are reduced, silica bricks are not only an expensive material used in the high temperature zone of cement kilns (1300°C-1400°C), but also unstable in alkali resistance. If it is used in a low temperature area, it will not only increase the operating cost of cement production, but also often cause accidents

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