A zirconium composite high-performance fused magnesia-calcium-zirconium brick and its manufacturing method

Abstract

The invention belongs to the technical field of refractories for steel smelting furnaces, and in particular relates to a zirconium composite high-performance electrofused magnesium-calcium zirconium brick and a manufacturing method thereof; the zirconium composite high-performance electrofused magnesium-calcium zirconium brick comprises 5-10% of electrofused magnesium-calcium zirconium sand with a partical size of 5-8mm, 20-35% of electrofused magnesium-calcium zirconium sand with a partical size of 2-5mm, 20-30% of electrofused magnesium-calcium zirconium sand with a partical size of 2-0.074mm, 10-15% of electrofused magnesium-calcium zirconium sand fine powder with a partical size of 0.074mm or less, 1-5% of electrofused magnesium sand with a partical size of 5-8mm, 1-10% of electrofused magnesium sand with a partical size of 2-5mm, 1-5% of electrofused magnesium sand with a partical size of 2-0.074mm, 5-10% of electrofused magnesium sand fine powder with a partical size of 0.074mm or less, 5-10% of electrofused magnesium sand super-fine powder with a partical size of 0.037mm or less, 0.5-1.2% of calcium stabilized zirconia with a partical size of 0.5mm or less, 0.5-2% of metal calcium powder with a partical size of 0.088mm or less, 0.1-0.5% of silica fume with a partical size of 0.003mm or less and 2-5% of a binder. The method can obviously improve the physical and chemical performance indexes of the magnesium-calcium zirconium brick, anti-penetration, anti-erosion, anti-erosion and anti-spalling and other use performances of the magnesium-calcium zirconium brick can be improved, and most importantly, the magnesium-calcium zirconium brick can meet the requirements of current smelting conditions.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for steel smelting furnaces, and in particular relates to a zirconium composite high-performance fused magnesia-calcium-zirconium brick and a manufacturing method thereof. Background technique [0002] As we all know, because free CaO in magnesia-calcium bricks has a purifying effect on molten steel, it is widely used in stainless steel and special steel smelting furnaces. At present, domestic magnesia-calcium bricks generally use sintered magnesia-calcium sand as raw material to produce magnesia-calcium bricks with a CaO content of 20-30%. This type of magnesia-calcium brick generally has a porosity of 8-12% and a bulk density of 3.00g / cm 3 around, and SiO 2 、Al 2 o 3 , Fe 2 o 3 The sum of the three impurities accounts for 2-3%, the content of CaO is low, and the effect of purifying molten steel is not obvious. [0003] With the increase of demand for high-quality steel such as...

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Problems solved by technology

At present, domestic magnesia-calcium bricks generally use sintered magnesia-calcium sand as raw material to produce magnesia-calcium bricks with a CaO content of 20-30%. This type of magnesia-calcium brick generally has a porosity of 8-12% and a bulk density of 3.00g / cm 3 around, and SiO 2 、Al 2 o 3 , Fe 2 o 3 The sum of the three impurities accounts for 2-3%, the CaO content is low, and the effect of purifying molten steel is not obvious

[0003] With the increase of demand for high-quality steel such as clean steel in modern industry, the rapid development of refining technology outside the furnace, the increase of furnace capacity and the increase of smelting temperature, the conditions for the use of magnesia-calcium bricks are more stringent. For example: a domestic steel factory 180 Due to the poor corrosion resistance of magnesia-calcium bricks used in the wind eye area and slag line, the AOD furnace was offline ahead of schedule; the VOD ladle of a domestic steel factory has unsatisfactory erosion resistance and erosion resistance at the bottom of the ladle and the slag line , the furnace life cannot be increased; the facts have proved that the performance of the current magnesia-calcium bricks can no longer meet the target requirements of the blast furnace life and low cost of the steel plant

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