Silicon carbide, mullite and andalusite spray coating for hot-blast stove dome

Abstract

The invention relates to a refractory material, and in particular relates to a silicon carbide, mullite and andalusite spray coating for a hot-blast stove dome, and the silicon carbide, mullite and andalusite spray coating is used for solving the problems that a casting material adopted for a lining of the hot-blast stove dome in the prior art is difficult in construction and short in service life. The spray coating comprises the following components in parts by mass: 15-25 parts of fused calcium aluminate cement, 0.1-0.3 part of plasticizer, 30-35 parts of mullite with the particle diameter of 3-5mm, 15-23 parts of andalusite, 8-12 parts of silicon carbide with the particle diameter of 0-1mm, 5-8 parts of zirconite and 1-3 parts of aluminum dihydrogen phosphate powder. The andalusite, mullite and silicon carbide are used as main raw materials, so that the creep resistance and low expansion of the spray coating are strengthened; the petrochemical reaction of the andalusite is irreversible at a use temperature, so that the thermal shock resistance of the spray coating is improved, the spray coating has the advantages of good acid corrosion resistance, good volume stability, small high-temperature thermal expansion coefficient and good thermal shock resistance, poor phenomena of masonry deformation, depression, distortion and the like of the lining of the hot-blast stove dome under the long-term high-load working condition are avoided, and the service life of the hot-blast stove dome is prolonged.

Description

technical field [0001] The invention relates to a refractory material, in particular to a silicon molybdenum spray coating for a dome of a hot blast stove. Background technique [0002] The dome of the hot blast stove is the part of the masonry structure connecting the combustion chamber and the heat storage chamber. It has been working under high temperature and high pressure for a long time. Nitrogen and oxygen in the air are prone to produce nitrogen oxides under high temperature and high pressure, which will affect the refractory materials in this part. Serious corrosion is caused; therefore, the castable used for the dome lining of the hot blast furnace is not only required to be able to resist high-temperature airflow erosion, but also to have good high-temperature corrosion resistance; currently used refractory castables are clay, high alumina, mullite etc. These materials meet the requirements of use to a certain extent, but there are still problems such as difficult...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a silicon molybdenum spray coating for the dome of a hot blast stove, which aims to solve the problems of difficult construction and low service life of the castable used in the dome lining of the hot blast stove in the prior art