Preparation method for rebonded electrically fused chrome corundum brick

Abstract

The invention discloses a preparation method for a rebonded electrically fused chrome corundum brick. Corundum granules, chrome ore powder and chromic oxide powder are first prepared, electrically fused chrome corundum granules are synthesized according to a certain proportion, the materials are weighed according to 40 to 70 parts of corundum material, 8 to 20 parts of chrome ore material, 15 to 30 parts of synthesized electrically fused chrome corundum material and 1 to 3 parts of chromic oxide material, put into a mixing mill, added with aluminium dihydrogen phosphate solution, mixed, milled and pressed to form a semifinished green brick, and after drying and sintering, the finished product is prepared. The rebonded electrically fused chrome corundum brick has the characteristics of high refractoriness, high strength, high thermal shock resistance and strong corrosion resistance; because high-melting point chromohercynite and hercynite can be produced on the surface of a furnace liner and stuck on the furnace liner to form a protective layer, thus not only can the scouring resistance of the furnace liner be enhance, but also melt can be stopped from infiltrating the brick, and thereby the service life of the brick can be greatly prolonged.

Description

technical field [0001] The invention relates to a refractory material, in particular to a method for preparing an electrofusion rebonded chromium corundum brick used for the inner lining of a nonferrous metal smelting furnace. Background technique [0002] With the rapid development of the non-ferrous metallurgical industry, the output of non-ferrous metals such as copper, nickel, lead, zinc and aluminum in my country has exceeded 19 million tons, ranking first in the world for five consecutive years. Due to the sharp increase in the world's non-ferrous metal prices (copper has reached 6,000 US dollars / ton), my country's non-ferrous metal industry has also entered a period of rapid development. At present, the slag composition of non-ferrous metal smelting furnace is mostly Fe 2 o 3 - SiO 2 -CaO slag system, the main reason for the damage of high-quality fused rebonded magnesia-chrome bricks mainly used as linings is that although these products belong to the polycrysta...

AI Technical Summary

Problems solved by technology

At present, the slag composition of non-ferrous metal smelting furnace is mostly Fe 2 o 3 - SiO 2 -CaO slag system, the main reason for the damage of high-quality fused rebonded magnesia-chrome bricks mainly used as linings is that although these products belong to the polycrystalline composite spinel phase and have good toughness and anti-erosion performance, but at high temperatures Under certain conditions, there is no protective layer of high melting point compounds on the surface, and the corrosion resistance is poor, which greatly shortens the service life of lining bricks in smelting furnaces