Method for preparing SiC material by using used refractory material

Abstract

The invention relates to a method for preparing a SiC material by using a used refractory material and belongs to the technical field of synthesis of refractory materials. The method comprises the processing steps: proportioning raw materials according to a formula, wherein the formula comprises the raw materials in percentage by mass: 55-75% of used silica refractory material, 20-40% of activated charcoal and 1-5% of auxiliary binder; carrying out crushing: carrying out mix grinding on the used silica refractory material in a ball mill until the grain size of powder is 35-45 microns; carrying out mixing and forming; and carrying out high-temperature heat treatment: during synthesis, carrying out carbon burying control in air so as to obtain a reducing atmosphere system, rising the temperature to 1,400-1,600 DEG C, and carrying out heat preservation for 3-10 hours. According to the method, the SiC material with relatively high purity can be prepared, the process method is controllable, the used silica refractory material is fully utilized, a competent effective measure is provided for the resource-converting comprehensive utilization of the used refractory material, the production and manufacturing cost of products is greatly reduced, and the added value of the products is increased.

Description

technical field [0001] The invention relates to the technical field of refractory materials, and in particular provides a method for preparing SiC materials by using used refractory materials. Background technique [0002] SiC is a kind of refractory non-oxide with strong covalent bonding. It decomposes into graphite and gas phase at about 2600℃ under atmospheric pressure. It also has high mechanical strength, good thermal conductivity, wear resistance and corrosion resistance. Excellent performance and other characteristics, so it is widely used in industrial fields such as abrasives, refractory materials, high-temperature structural ceramics, and high-temperature metallurgy. Industrial silicon carbide is generally mixed with a small amount of impurities such as free carbon, silicon dioxide and silicon. Application of SiC in high temperature metallurgy and materials industry [0003] Widely, it can be used as a conductive heating element for high-temperature furnaces, and...