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Application Characteristics Of Low Cement Refractory Castables In Cement Kiln Kiln

- Nov 17, 2018 -

The cement kiln has high working temperature, large heat load, easy change of raw material composition, and harmful gas in the evaporation place, so the selection of refractory materials is relatively strict.

The cement kiln has high working temperature, large heat load, easy change of raw material composition, and harmful gas in the evaporation place, so the selection of refractory materials is relatively strict. It is also the reason that the lining body is easily cracked, peeled off and abraded, so that the refractory castable is required to have thermal shock resistance, wear resistance and alkali resistance. If the deformation of the kiln mouth of the rotary kiln can be poured with refractory castable, the anchoring nail is welded on the steel shell, and the steel fiber refractory castable is added to the castable, and the construction and baking are carried out according to the regulations to improve the high temperature resistance and wear resistance of the kiln mouth lining. In the past, refractory castables made of corundum and high-aluminum steel fibers were used, but the aluminum content was high and the strength was high, which reduced the heat resistance and reduced the service life. Therefore, the replacement of corundum and high-aluminum refractory castables with steel fiber refractory castables can improve the service life of the kiln mouth.

The refractory aggregate is made of second-grade alumina clinker, coke gemstone and mullite. The critical diameter is enlarged, and the particle gradation should be reasoned to achieve densification, which is beneficial to improve the thermal shock resistance and strength of the material.

Materials such as refractory powders, binders and admixtures are the matrix materials for refractory castables and must be properly graded to improve their performance. At normal temperature, the construction strength can be obtained, and under the action of high temperature, phase transformation and sintering are likely to occur. At the same time, in-situ reaction occurs between the materials, and the micro-expansion can offset the sintering shrinkage and improve the thermal shock resistance and strength of the castable.

The refractory powder is made of corundum, bauxite clinker, mullite and silicon carbide, and is broken into various grades for assembly. At the same time, ultra-fine powder should be added to fill the voids, and the activity is large, and it is easy to generate in-situ reaction and improve matrix performance.

The binder is selected from calcium aluminate cement, ultrafine powder and phosphate, and is generally used in combination; the amount thereof should ensure the strength of demoulding, and the drying compressive strength reaches about 40 MPa.