Unfired Al2O3-Cr7C3 brick for hot metal ladle wall and preparation method thereof

Abstract

The invention discloses an unfired Al2O3-Cr7C3 brick for a hot metal ladle wall and a preparation method thereof. The unfired Al2O3-Cr7C3 brick comprises aggregate and substrate materials, wherein the aggregate is prepared from, by weight, 55%-60% of ferrochrome slag particles, and the substrate materials are prepared from, by weight, 6%-8% of ferrochrome slag fine powder, 1%-3% of rho-Al2O3 fine powder and 32%-37% of Cr7C3 fine powder. The preparation method comprises the steps that according to the raw materials and the contents thereof, the substrate materials are mixed firstly, and the mixed substrate materials are added to the aggregate to be mixed for 5-8 min; thermosetting phenolic resin accounting for 4%-6% by weight of the raw materials and silica sol accounting for 1%-4% by weight of the raw materials are additionally added, mixing is conducted for 10-15 min, and mechanical pressing is conducted; maintenance is conducted for 10-12 h on the condition that the temperature ranges from 30 DEG C to 35 DEG C, heat preservation is conducted for 12-24 h on the condition that the temperature ranges from 200 DEG C to 220 DEG C, and the unfired Al2O3-Cr7C3 brick for the hot metal ladle wall is prepared. The unfired Al2O3-Cr7C3 brick for the hot metal ladle wall and the preparation method thereof have the advantages of being low in production cost and simple in technology, and the prepared unfired Al2O3-Cr7C3 brick for the hot metal ladle wall is high in density, strong in slag erosion resistance and good in heat-shock stability.

Description

technical field [0001] The invention belongs to the technical field of unfired bricks used for ladle walls of molten iron. Be specifically related to a kind of molten iron ladle wall and use non-burning Al 2 o 3 -Cr 7 C 3 Bricks and methods of making them. Background technique [0002] Ladle is an open equipment for transporting and smelting molten iron. When the molten iron is shipped, the molten iron ladle wall is subject to high temperature, thermal shock and slag-hot metal chemical erosion; when the molten iron is poured out, the temperature of the molten iron ladle wall decreases rapidly. Generally speaking, the service conditions of refractory materials for ladle walls are harsh. With the development of iron and steel smelting level (such as "three removal" process), the service life of refractory materials for ladle walls is further reduced. Therefore, "low cost, high performance" has become the development direction of refractory materials for ladle walls. [...

AI Technical Summary

Problems solved by technology

But inevitably, both SiC and graphite in alumina-silicon carbide-carbon bricks are prone to oxidation to form CO 2 Gas escapes, leaving pores in the brick body, which greatly reduces the density of alumina-silicon carbide-carbon bricks, thereby reducing the ability of bricks to resist slag-hot metal erosion, and damages the alumina-silicon carbide-carbon Brick life

In addition, there are many varieties of raw materials, antioxidants, additives, and binders for preparing alumina-silicon carbide-carbon bricks, which increase the production cost of alumina-silicon carbide-carbon bricks