Al2O3-SiC-C brick containing reclaimed materials and preparation method of Al2O3-SiC-C brick

Abstract

The invention discloses an Al2O3-SiC-C brick containing reclaimed materials, belonging to the field of refractory materials. The Al2O3-SiC-C brick containing reclaimed materials comprises the following components by weight: 20-30 parts of reclaimed material particles, 30 to 40 parts of high-alumina bauxite particles, 10 to 20 parts of corundum particles, 10 to 20 parts of fine corundum powder, 5-15 parts of fine silicon carbide powder, 5-15 parts of crystalline flake graphite, 0-5 parts of an additive, and 2-6 parts of a binding agent. The Al2O3-SiC-C brick has the advantages of favorable slagerosion resistance, favorable molten iron scouring resistance, high high-temperature breaking strength, excellent thermal shock resistance, stable high-temperature thermal expansion coefficient and stable residual expansion rate, and can prolong the service life of a ladle when used as the working lining of the ladle.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an Al 2 o 3 -SiC-C brick and its preparation method. Background technique [0002] In the production process from the blast furnace to the steelmaking furnace, most of the containers for holding molten iron in iron and steel enterprises adopt the form of "one tank to the bottom". The blast furnace molten iron is mixed into the ladle and then transported to the steelmaking plant, and then the molten iron is pretreated. After the composition of the molten iron meets the requirements, it is finally mixed into the steelmaking furnace. During the whole process, the transportation of the molten iron and the pretreatment of the molten iron are carried out in the ladle without replacing the high-temperature container. [0003] The transportation of molten iron is to transport the molten iron from the blast furnace to the steelmaking furnace through the ladle under certain...

AI Technical Summary

Problems solved by technology

[0005] Although Al 2 o 3 -SiC-C bricks have excellent performance, and the use effect has been recognized by customers, but there is still a very difficult problem: with the advancement of the ladle furnace age, Al 2 o 3 and SiO 2 react to form mullite (A 3 S 2 ), the mineral phase in the material changes from corundum phase to mullite phase, and the Al 2 o 3 -SiC-C bricks and Al in early furnace age 2 o 3 -Compared with SiC-C bricks, with the transformation of the mineral phase of the material, the thermal expansion of the material becomes smaller, and it is not enough to make up for the masonry joints in the hot state, resulting in the preferential erosion of molten iron and slag and the erosion of brick joints, and finally, the late ladle furnace age The brick joints are becoming more and more obvious, thus forming a "steamed bun shape"

MgO and Al at high temperature 2 o 3 A reaction will occur to form spinel, which is accompanied by a volume effect of 6%-9%. However, due to the presence of elemental silicon powder, silicon carbide and SiO produced by silicon oxidation in the material 2 Existence, the low-melting point phase generated by the complex multi-component reaction leads to obvious shrinkage of the material, which weakens the expansion effect caused by the formation of spinel, makes the structure of the material loose, and reduces its oxidation resistance and other properties