Magnesium-calcium-zirconium brick manufactured by means of in-situ reaction and used for secondary refining and production method

Abstract

The invention relates to a magnesium-calcium-zirconium brick manufactured by means of in-situ reaction and used for secondary refining and a production method. During manufacturing, 0-20% of 3 mm-5 mm magnesia particles, 30-55% of 1 mm-3 mm magnesia particles, 4-15% of 0.088 mm-1 mm fine magnesia particles, 2-10% of 0.088 mm-0.5 mm fine desilicated zirconia particles, 5-30% of magnesia powder with the diameter being less than 0.088 mm, 0-15% of calcium zirconate powder with the diameter being less than 0.088 mm, 2-9% of zirconia micro powder with the diameter being less than 0.020 mm, 2-8% of calcium carbonate micro powder with the diameter being less than 0.020 mm, 4-8% of additional waste pulp liquid and 0.2-0.05% of additional third-generation water reducing agents are used; during production, the adopted process includes the steps that firstly, the zirconia micro powder and the calcium carbonate micro powder are premixed; secondly, the 3 mm-5 mm magnesia particles, the 1 mm-3 mm magnesia particles and the 0.088 mm-1 mm fine magnesia particles are added to a mixing mill, and he waste pulp liquid and the third-generation water reducing agents are added to the mixing mill to be mixed; thirdly, magnesia powder with the diameter being less than 0.088 mm, calcium zirconate with the diameter being less than 0.088 mm and premixed zirconia-calcium carbonate micro powder with the diameter being less than 0.020 mm are add and mixed until the mixture is even; finally, forming, drying, 1580-1700 DEG C sintering and checking are conducted on the mixture to obtain a refractory material with periclase-calcium zirconate-baddeleyite as a main crystal phase. The magnesium-calcium-zirconium brick has the advantages of being convenient to manufacture, low in cost, simple to use and excellent in performance, has excellent anti-erosion performance and thermal shock resistance, excellent high-temperature physical and chemical stability, and is competent for the work of secondary refining to make clean steel.

Description

technical field [0001] The invention relates to an alkaline refractory material used for refining equipment outside a furnace in the metallurgy and machinery industry and a production method thereof. The material has the characteristics of convenient manufacture, low cost, simple use, and excellent performance. It not only has excellent corrosion resistance and thermal shock resistance, but also has excellent high-temperature physical and chemical stability, so it can be competent for the harsh work of refining outside the furnace. Deep desulphurization, deoxidation, and the task of controlling non-metallic inclusions in molten steel to produce high-quality steel with high toughness and high reliability, such as ultra-low carbon steel with high cleanliness. Background technique [0002] Refining outside the furnace is a process that can significantly increase the output of steelmaking and the quality of steel products. It is characterized in that the refining task in the ste...

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Problems solved by technology

Otherwise, magnesia-calcium bricks may be damaged by thermal shock and hydration

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