Unburned magnesium-calcium zirconate brick not containing free carbon

Abstract

The invention relates to an unburned magnesium-calcium zirconate brick not containing free carbon. The unburned magnesium-calcium zirconate brick comprises the following raw materials in parts by weight: 10-20 parts of 97 fused magnesite with the granularity of more than 0 and less than or equal to 1 mm (0-1 mm), 25-35 parts of 200-mesh 97 fused magnesite fine powder, 10-20 parts of 20 calcium magnesium sand with the granularity of more than 1 mm and less than or equal to 3 mm (1-3 mm), 10-15 parts of 20 calcium magnesium sand with the granularity of more than 3 mm and less than or equal to 5 mm (3-5 mm), 5-15 parts of rotary kiln calcium magnesium sand with the granularity of more than 0 and less than or equal to 1 mm (0-1 mm), 5-15 parts of rotary kiln calcium magnesium sand with the granularity of more than 1 mm and less than or equal to 3 mm (1-3 mm), 5-15 parts of rotary kiln calcium magnesium sand with the granularity of more than 3 mm and less than or equal to 5 mm (3-5 mm), 0-3 parts of fused zirconia micro-powder, 0-2 parts of high-temperature asphalt powder and 2-4 parts of a binder. Two calcium magnesium sands with different heat expansion coefficient high-temperature properties are compounded to facilitate prolonging the service life of a refractory material. No graphite is not added, and no free carbon is contained, so that carburetion to molten steel is minimized.

Description

technical field [0001] The invention relates to weather-resistant materials, in particular to an unburned magnesia-calcium-zirconium brick without free carbon. Background technique [0002] In the early 1980s, in order to develop refractory materials for refining outside the furnace, Luoyang Refractory Research Institute did a lot of work, focusing on the development of high-quality MgO-CaO refractory materials, including tar-fired magnesia dolomite bricks and magnesia carbon bricks, high-quality pre-reaction Magnesia chrome bricks and fused rebonded magnesia chrome bricks. The study found that during the baking and resting period of the ladle, the surface of the carbon-containing lining brick was seriously decarburized, resulting in rapid damage to the lining. Therefore, a magnesium oxide dolomite carbon brick that can form a dense layer on the surface has been successfully developed. [0003] MgO-CaO series refractories have the characteristics of high temperature resist...

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Problems solved by technology

However, due to their relatively high coefficient of thermal expansion, these materials have poor thermal shock resistance and are also susceptible to penetration by molten slag, which can lead to spalling of the structure

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