High-strength alkali-resisting castable for preparing coal gangue, and method thereof

Abstract

A high-strength alkali-resistant castable prepared from coal gangue and a method thereof belong to the technical field of refractory castables. It is composed of coal gangue, silicon micropowder, coke gemstone micropowder, calcium aluminate cement, and admixtures. The particle size and mass percentage of each raw material are: coal gangue: 10% to 20% of particle size 5mm ~ 8mm, coal gangue: particle size 3mm ~ less than 5mm 10-25% of coal gangue: 20-30% of particle size 1mm-less than 3mm, coal gangue: 10-40% of particle size less than 1mm, burnt gem: 0-10% of particle size 5μm, silicon powder: 2-10% , Calcium aluminate cement: 5-15%, admixture: 0.1-0.4%. The invention has the advantages of fully utilizing the waste coal gangue resources, and the high SiO2 content in the coal gangue can prepare high-strength alkali-resistant castables with excellent alkali resistance and low price. This kind of castable can be widely used in the preheater and grate cooler of the new dry process cement rotary kiln system, where the alkali erosion is relatively serious and the thermal engineering is similar.

Description

technical field [0001] The invention belongs to the technical field of refractory castables, and in particular provides a high-strength alkali-resistant castable prepared from coal gangue and a method thereof. Background technique [0002] From the late 1990s to the present, China's new dry process cement production has developed rapidly, especially large-scale new dry process cement kilns, such as new dry process cement production technology and equipment with a daily output of 5,000 tons and a daily output of 10,000 tons have reached the international advanced level. my country has become the world's cement manufacturing center. [0003] With the improvement of production technology, the overproduction phenomenon of cement clinker production line is more and more common, which brings a series of influences to dry process cement production line. For example, the alkali enrichment and alkali erosion of the castables in the preheater, grate cooler and kiln hood are becoming m...

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Problems solved by technology

[0006] The purpose of the present invention is a high-strength alkali-resistant castable prepared from coal gangue and its method. Since the silicon content in coal gangue is relatively high, it can improve the shortcomings of poor alkali resistance of the bauxite aggregate in the current alkali-resistant castable, thereby improving the alkali resistance. Alkali resistance of alkali castables

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