Cement-free aluminum-magnesium castable for rapidly baking ladle

Abstract

The invention discloses a cement-free aluminum-magnesium castable for rapidly baking a ladle. The castable consists of the following components in percentage by mass: 45-75 percent of corundum (granularity of 25-0.074 millimeters), 15-35 percent of fine alumina powder, 3-7 percent of magnesia powder of which the magnesite content is over 96 percent, 0.5-1.5 percent of alkaline aluminum lactate powder, 0.02-0.06 percent of metal aluminum powder, 0.1-0.3 percent of polypropylene fibers of which the melting point is lower than 200 DEG C, 0.5-1.5 percent of micro silicon dioxide powder, 0.1-0.3 percent of a water reducing agent, 5-35 percent of aluminum-magnesium spinel (granularity of 25-0.074 millimeters) and 0.5-3 percent of hydrated alumina powder. The castable disclosed by the invention has the advantages of difficulty in cracking during quick baking, superior molten steel erosion, residue erosion resistance and residue permeation resistance; and the castable does not pollute molten steel when taken as a refractory material of an inner lining of a container for accommodating the molten steel during smelting of pure steel, and has relatively long service life.

Description

technical field [0001] The invention relates to a refractory material, in particular to a cementless aluminum-magnesium pouring material used for fast-baking ladles. Background technique [0002] The existing lining refractories for ladles mainly include alumina-magnesia-carbon bricks and castables, such as aluminum spinel or aluminum-magnesium castables. The Chinese invention patent CN1337376A published on February 27, 2002 discloses a casting material for ladles, the weight ratio is: fused white corundum 75-95%, fused magnesia 5-15%, chrome green 1- 5%, Si0 2 1%, pure calcium aluminate cement 1%. The Chinese invention patent CN1640590A published on July 20, 2005 discloses a ladle aluminum-magnesium-densified fused corundum castable, which is composed of three parts A, B and C, and the weight percentage of each component is based on casting The total weight of the material is 100% by weight: part A is a homogeneous mixture of the following components: dense fused c...

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Problems solved by technology

If the baking is not done properly, the heating rate will be too fast, wh

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