Light mullite refractory coating

Abstract

The invention relates to a light mullite refractory coating which is prepared from the following components in parts by weight: 50-60 parts of low-aluminium-content mullite, 10-25 parts of special-grade kaolin, 5-20 parts of aluminum lactate, 6-8 parts of pure calcium aluminate cement, 5-10 parts of silica fume, and 5-10 parts of water; after being mixed, the low-aluminium-content mullite and the special-grade kaolin are prepared into 30-70 parts by weight of particles and 30-70 parts by weight of fine powder; the particle diameter of the particles is in the range of 2.0-1.5 mm; the particle diameter of the fine powder is in the range of 1.4-0.5 mm. The light mullite refractory coating disclosed by the invention can be applied in a spraying manner. Compared with the traditional pouring manner, a spray manner of the light mullite refractory coating disclosed by the invention has the advantages that more than 60% of time can be saved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, in particular to a lightweight mullite refractory spray coating. Background technique [0002] Compared with qualitative refractory products, unshaped refractory materials represented by refractory castables have the advantages of short process flow, low production energy consumption and cost, convenient use, wide application range, integrity and good use effect, so they are widely used in the world. It has developed rapidly, and its proportion in the whole refractory material is getting higher and higher. In some countries with advanced refractory technology, the output of unshaped refractories has approached or even exceeded the output of shaped products. For example, the current output of unshaped refractory materials in Japan accounts for about 60% of the total refractory materials; in the United States, it is about 50%; in Britain, Germany, France and other countries, it is 40%...

AI Technical Summary

Problems solved by technology

[0004] For example, the protective layer on the inner surface of the blast furnace, hot blast stove shell, blast furnace head, gas outlet pipe, and working lining of the dust collector all need to use refractory materials. If the refractory castable inside the furnace falls off, the furnace needs to be shut down for more than one day. After the temperature drops to room temperature, workers can be sent in to pry off part of the castable material, and then set up the mold again before manual pouring. After pouring, it needs to be maintained for 3 days before it can be re-ignited. The service life of the refractory material after the above-mentioned repair method is relatively short, which causes Prolonged shutdown time, resulting in reduced operating efficiency of the furnace