Special casting material for 12000D/T kilneye

Abstract

The invention discloses a special casting material for a 12000D / T kilneye, belonging to the field of refractory materials. The special casting material contains the following components in percentage by weight: 15-25% of mullite, 10-20% of sillimanite, 25-30% of tabular corundum, 5-10% of strontium titanate powder, 5-8% of zirconium oxide powder, 1-3% of gahnite powder, 3-5% of boron nitride, 5-10% of aumina micro-powder, 4-6% of calcium aluminate cement, 0.2% of polylactic acid fiber and sodium hexametaphosphate serving as an additive, wherein the addition amount of sodium hexametaphosphate accounts for 0.1% of the total weight of other components. The special casting material has high strength and the thermal shock resistance, high temperature resistance, volume stability and wear resistance of the material are improved; by use of the casting material, such defects of the kilneye as poor wear resistance and poor thermal shock resistance are overcome so that the service life of the kilneye of a cement kiln is prolonged from about 10 months at present to two years and longer.

Description

technical field [0001] The invention relates to the field of high-temperature materials for building materials, in particular to a special castable for cement kiln mouths. Background technique [0002] At present, my country's new dry process cement production line is developing rapidly. In 2013, the cement production capacity has exceeded 2.1 billion tons, and the cement production capacity is seriously overcapacitated. Therefore, how cement companies improve productivity and maximize profits is the only way to compete in the market. Improving the operation rate of the cement production line is an important condition for improving the production efficiency of the cement kiln and earning economic benefits. However, because the cement kiln is subject to higher temperature, severe temperature changes, strong chemical erosion and severe mechanical stress, the new dry process cement production line needs more excellent performance refractory materials. [0003] The working co...

AI Technical Summary

Problems solved by technology

Kiln mouth castables have developed from traditional high-alumina high-strength castables to high-performance low-cement castables characterized by the addition of ultrafine powder and high-efficiency water reducers. The existing corundum-spinel castables (such as patent CN101407424A), corundum - Mullite castables (such as patent CN101445379B) and other low-cement castables, although the overall performance of the castables have been improved, the service life of the kiln mouth has been extended from 4-6 months of the traditional use of high-alumina high-strength castables to About 10 months, prolonging the life of the cement kiln mouth, but still can not meet the needs of customers, especially in some cement kilns with harsher use environment, the current kiln mouth pouring material is not wear-resistant and easy to peel off, which seriously restricts the cement kiln production line The increase in operation rate has affected the economic benefits of cement manufacturers

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