High-density ultrahigh-purity magnesia-calcium brick and preparation method thereof

Abstract

The invention discloses a high-density ultrahigh-purity magnesia-calcium brick and a preparation method thereof. The high-density ultrahigh-purity magnesia-calcium brick is prepared from 9 to 16% of magnesia-calcium sand having particle sizes of 5-7mm, 9 to 16% of magnesia-calcium sand having particle sizes of 3-5mm, 9 to 16% of magnesia-calcium sand having particle sizes of 1-3mm, 13 to 32% of magnesia-calcium sand having particle sizes of 0.5-1mm, 5 to 25% of magnesia-calcium sand having particle sizes less than or equal to 0.5mm, 5 to 10% of high-purity magnesia sand fine powder having particle sizes less than or equal to 0.044mm, 2 to 5% of tar resin or paraffin, and 2 to 5% of fused zirconia. The preparation method comprises the following steps of raw material proportioning, raw material blending, mixing, molding, sintering, waxing and vacuum aluminium foil package. The high-density ultrahigh-purity magnesia-calcium brick has a high product compact degree and excellent hydration resistance. The high-density ultrahigh-purity magnesia-calcium brick has high purity and thus high slag corrosion resistance and high flushing resistance are obtained. Compared with other like products, the high-density ultrahigh-purity magnesia-calcium brick has better thermal shock resistance. The high-density ultrahigh-purity magnesia-calcium brick contains a large amount of dissociative CaO and thus the high-density ultrahigh-purity magnesia-calcium brick has excellent molten steel cleaning performances and is especially suitable for production of high cleanliness steel such as stainless steel.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a high-density ultra-high-purity magnesia-calcium brick and a preparation method thereof. Background technique [0002] At present, refractory materials for smelting stainless steel and special steel in China generally use fired magnesia-calcium bricks. During the process, the anti-erosion performance around the AOD slag line and the air gun is not good, and the anti-scouring performance at the bottom of the stainless steel ladle is not ideal. Contents of the invention [0003] The present invention overcomes the shortcomings in the above-mentioned prior art, and provides a high-density ultra-high-purity magnesia-calcium brick with high bulk density, high resistance to hydration and cracking, strong slag erosion resistance and erosion resistance, and a preparation method thereof. [0004] Technical scheme of the present invention is realized like this: [0005] A high-dens...

AI Technical Summary

Problems solved by technology

[0002] At present, refractory materials for smelting stainless steel and special steel in China generally use fired magnesia-calcium bricks. During the process, the anti-erosion performance around the AOD slag line and the air gun is not good, and the anti-erosion performance at the bottom of the stainless steel ladle is not ideal.