Raw materials and preparation method of anti-corrosion mullite brick

Abstract

The invention discloses raw materials for preparing an anti-corrosion mullite brick, comprising calcium hexaluminate, andalusite, sillimanite, alumina, cordierite, pyrophyllite, kaolin, refractory oxide, foaming agent and binding agent. The preparation method includes the following steps: the sillimanite, alumina, cordierite, pyrophyllite, kaolin, refractory oxide and binding agent are added into a grinding machine to be ground after material preparation, so as to obtain base material; the calcium hexaluminate and andalusite are added into a kollermill to be mixed and milled for 5-10 minutes, water is added until the surface is wetted, so as to obtain particle aggregate, and the base material is added into the kollermill to be mixed, milled and stirred with the particle aggregate, so as to obtain mixture; and water is injected into the mixture and stirring is carried out to form muddy mixture and green brick is obtained, and the green brick is placed into a kiln to be sintered into the anti-corrosion mullite brick finished product. The mullite brick prepared by the raw materials and preparation method has the advantages of low thermal conductivity, good thermal insulation property and strong corrosion resistance.

Description

technical field [0001] The invention relates to a thermal insulation refractory material, in particular to a raw material for preparing mullite sintered bricks for heat recovery coking ovens. The invention also relates to a preparation method of the mullite sintered bricks. Background technique [0002] The heat recovery coke oven is a kind of coke oven that burns the waste gas and some harmful substances produced in the coking process reasonably and fully in the coke oven, and recovers the heat of the high-temperature waste gas for power generation or other purposes. Since the heat recovery coke oven does not discharge soot and waste gas during the coking process, and realizes the resource utilization of high-temperature waste gas, it realizes the coordinated development of clean production, environmental protection and economic benefits. [0003] During the coking and gas transmission process of the heat recovery coke oven, the surface heat insulation layer of the furnace ...

AI Technical Summary

Problems solved by technology

[0004] The thermal insulation layer of the existing heat recovery coke oven, especially the rising pipe or gas collection pipe insulation layer of the gas gathering system and the furnace door insulation refractory inner layer, mostly use aluminum silicate fiber, ceramic fiber or zirconium-containing ceramic fiber folding blocks, etc. Commonly used thermal insulation materials, although these fibrous thermal insulation materials have the advantages of light weight and low thermal conductivity, they cannot block the erosion of harmful corrosive gases on the thermal insulation and refractory layer. The existence of uniformity or temperature gradient can easily produce shrinkage gaps, and high-temperature exhaust gas invades the thermal insulation refractory layer through these gaps, burns the anchors of the thermal insulation layer, causes the thermal insulation refractory layer to fall off, and accelerates the peeling and collapse of the thermal insulation layer. Not only will the heat preservation performance of the coke oven drop sharply, but it will also lead to the infiltration of low-temperature gas and a large amount of high-temperature heat energy, which will not only cause a decrease in the utilization rate of heat energy, but also cause environmental pollution.