Compound phose material of beta cellulose and alpha cellulose and its preparation technology

Abstract

The invention provides a beta-Sialon and alpha-Sialon multiple phase material and process for its preparation, wherein the material is prepared by using coal gangue and natural bauxite (or silica sand) as raw material through charging carbon powder and de-acidizing and nitriding at high temperature and under nitrogen atmosphere, the mass percents of coal gangue, bauxite and carbon powder in the raw material are 40-90%, 0-55% and 5-20%. The preparing process comprises subjecting the mixed raw material for synthesis reaction in nitrogen atmosphere at 1450-1650 deg. C, thermal insulating 1-4 hours and cooling down, finally a composite material of beta-Sialon with a purity of 60-90% and alpha-Sialon of 10-40% can be obtained, the carbon residue in the coal gangue can be fully utilized.

Description

technical field [0001] The invention belongs to the field of refractory materials, in particular to a nitrogen oxide composite refractory material. Background technique [0002] Coal gangue is the main waste of the coal industry. The coal gangue brought by conventional coal preparation or coal washing is higher than the total output of coal. Due to the complex composition of coal gangue, except for a small amount of coal gangue used as building materials, a large amount of coal gangue is in waste state, occupying a large amount of land, wasting precious resources and energy, and causing serious environmental pollution. [0003] The main components of coal gangue are silicon dioxide, aluminum oxide, carbon, and associated magnesium oxide, calcium oxide, iron oxide, etc., and there is a certain amount of residual carbon. Silicon dioxide and aluminum oxide are the main components of refractory materials. Therefore, the use of coal gangue to prepare refractory materials has bee...

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