Phosphate-bonded aluminum silicon carbide brick and preparation method thereof

Abstract

The invention discloses a phosphate-bonded aluminum silicon carbide brick, which is characterized by comprising main ingredients and a phosphate binder, wherein the main ingredients comprise the following raw materials by weight percentage: 45 to 68 percent of bauxite chamotte with a granularity of 3 to 0.088 mm, 10 to 25 percent of bauxite chamotte with a granularity of less than 0.088 mm, 4 to 14 percent of bauxite chamotte with a granularity of less than 0.044 mm, 0 to 10 percent of corundum, 1 to 5 percent of a chromic oxide-containing material, 4 to 20 percent of silicon carbide, 3 to 8 percent of clay, 2 to 5 percent of silicon dioxide micro powder, and 1 to 5 percent of metallic silicon; and the phosphate binder is added in an amount which is 4 to 10 percent of the weight of the main ingredients. The aluminum silicon carbide brick is made into high quality aluminum silicon carbide brick which has an apparent porosity of less than 15 percent, a cold crushing strength of more than 130MPa, a starting refractoriness under load of more than 1,600 DEG C and high inoxidability by ageing mixture, back rolling, forming, drying and baking.

Description

technical field [0001] The invention relates to the technical field of refractory material production, in particular to a phosphate-bonded aluminum silicon carbide brick and a preparation method thereof. The aluminum silicon carbide bricks can be used for lining working layer parts such as mixed iron furnaces, iron melting furnaces, molten iron tanks, ladles, torpedo tanks, etc. technical background [0002] At present, ordinary high-alumina refractory bricks are mostly used in the lining working layers of mixed iron furnaces, chemical iron furnaces, iron ladles, iron ladles, torpedo tanks, etc., due to the low compressive strength and relatively large pores of ordinary high-alumina refractory bricks. High, poor erosion resistance, poor erosion resistance and other disadvantages limit the large-scale use of ordinary high-alumina refractory bricks. In order to meet the special requirements of the above-mentioned furnaces, researchers have researched and developed aluminum si...

AI Technical Summary

Problems solved by technology

However, with the rapid development of iron and steel technology, the purification treatment of molten iron and molten steel also makes refractory bricks such as aluminum silicon carbide carbon unburned bricks and aluminum chromium silicon carbide unable to fully meet the process requirements

In particular, its poor oxidation resistance makes the slag line severely eroded, affects the service life of the kiln, increases labor intensity, high operating costs, complicated production process, and high firing temperature are not conducive to the development of today's circular economy.

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