Special castable for kiln mouth

Abstract

The invention relates to a special castable for a kiln mouth. The special castable comprises the following components by weight: 18-25 parts of 8-5mm mullite homogenate, 8-12 parts of 5-3mm ladle reclaimed material, 6-10 parts of 5-3mm mullite homogenate, 8-12 parts of 3-1mm ladle reclaimed material, 6-10 parts of 1-0mm ladle reclaimed material, 8-15 parts of 1-0mm mullite homogenate, 2-15 parts of spinel powder no more than 200 meshes; 3-5 parts of magnesia no more than 200 meshes, 6-10 parts of alumina powder, 5-8 parts of magnesia spinel cement, 1-3 parts of silicon micropowder, 0.01-0.03 part of explosion-proof fiber and 0.01-0.03 part of water reducing agent. The special castable adopts the ladle reclaimed materials, has low raw material cost, strong resistance to gas pickling of K2O,Na2O and other alkaline gas, strong wear resistance and thermal shock resistance stability, and satisfies the requirements of operation conditions of the kiln mouth use condition. The service life ismore than one year.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a special castable for kiln mouths. Background technique [0002] The refractory castables for rotary kiln, especially the refractory materials at the front kiln mouth, in addition to the high temperature above 1400 ℃, also need to withstand the impact of rapid cooling and rapid hot air flow, high temperature cement clinker wear and high temperature harmful gas alkali corrosion during use Such as mechanical stress, thermal stress and chemical erosion damage, the service conditions are very harsh, and the refractory materials used in the kiln mouth must have good thermal shock resistance, wear resistance and alkali resistance. The damage of the kiln mouth lining is mainly manifested as cracking, spalling and abrasion. The service life of the kiln mouth refractory castable has a crucial impact on the operation cycle of the entire cement production line. ...

AI Technical Summary

Problems solved by technology

[0003] At present, corundum and high-alumina steel fiber reinforced refractory castables are widely used in kiln mouth refractory materials. This product is a slightly acidic material, which is easy to chemically react with alkaline clinker, and the product is stable in thermal shock resistance. In general, the service life of aluminum-silicon refractory castables at the mouth of the rotary kiln does not exceed 8 months

Usually, the aluminum content in the kiln mouth castable is high and the strength is high, but the thermal shock resistance is poor, it is easy to crack and peel off, and the service life cannot be guaranteed

Patents CN102584296B, CN105218129B, and CN101407425A all use spinel as raw material to prepare kiln mouth castables, but direct use of spinel as raw material causes material cost to increase, and in-situ spinel bonded phase cannot be generated at high temperature, and the bonded phase used Most of the additives are calcium aluminate cement, which cannot completely match the composition of the main material.

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