Zirconium silicate-mullite composite wear-resisting castable and preparation method thereof

Abstract

The invention discloses zirconium silicate-mullite composite wear-resisting castable and a preparation method thereof. The castable is prepared from the following components in parts by mass: 18 to 24 parts of mullite with the size of 1mm to 8mm, 5 to 10 parts of andalusite particles with the size of 3mm to 5mm, 5 to 10 parts of compound ore powder with the grain diameter less than 0.075mm, 5 to 8 parts of ZrO2 with the grain diameter less than 1mum, 3 to 8 parts of silicon micro-powder with the grain diameter less than 1mum, 3 to 5 parts of Al2O3 micro-powder with the grain diameter less than 1.2mum, 3 to 7 parts of calcium aluminate cement, 0.15 to 0.2 part of sodium hexametaphosphate, 0.08 to 0.12 part of a flatting agent, 0.5 to 1.6 parts of heat-resisting steel fibers and 0.2 part of explosion-proof fibers. The zirconium silicate-mullite composite wear-resisting castable disclosed by the invention has the characteristics of high strength, high temperature resistance, good thermal shock resistance, wearing resistance and uneasiness of being cracked; in the aspect of the preparation method, a traditional construction manner is changed and a self flow mode is adopted; the problems of castable segregation and the like, which are possibly caused by vibration construction, are avoided; the zirconium silicate-mullite composite wear-resisting castable is applicable to abnormal-shape parts which are not easy to vibrate, such as coal injection pipes and kiln openings.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a zirconium silicate-mullite composite wear-resistant castable and a preparation method thereof. Background technique [0002] Cement rotary kiln kiln mouth, cement kiln coal injection pipe and other parts have heavy alkaline atmosphere components, strong clinker and hot flue gas scouring effect, large ambient temperature difference, high refractoriness and other special working conditions, the index requirements for refractory performance are compared High, conventional products generally use corundum mullite refractory castables, and the existing problems are: the thermal expansion coefficient of corundum is relatively large, the thermal shock stability is not good, corundum is transformed from α-phase corundum in the alkaline atmosphere of cement kiln It is β-phase corundum, which causes volume expansion and is easy to cause structural damage, which greatly shorte...

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Problems solved by technology

[0002] Cement rotary kiln kiln mouth, cement kiln coal injection pipe and other parts have heavy alkaline atmosphere components, strong clinker and hot flue gas scouring effect, large ambient temperature difference, high refractoriness and other special working conditions, the index requirements for refractory performance are compared High, conventional products generally use corundum mullite refractory castables, and the existing problems are: the thermal expansion coefficient of corundum is relatively large, the thermal shock stability is not good, corundum is transformed from α-phase corundum in the alkaline atmosphere of cement kiln It is β-phase corundum, which causes volume expansion and is easy to cause structural damage, which greatly shortens the life of the coal injection pipe and cannot meet the needs of the market.

[0003] The traditional construction method of castables is vibration construction. This method has the advantages of short production cycle, good integrity, and good uniformity, but there are also some shortcomings. Segregation, and when the vibrating rod is pulled out, it is easy to leave a cavity, and the excessive noise of the vibrator will affect the construction environment

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