Sintered chromium spinel refractory combined with electrofused MgO, used under vacuum and temperature fluctuations, atmosphere changes and slag corrosion, will have higher volume stability and corrosion resistance than refractory mainly electrofused magnesium chromium or sintered chromium spinel.

To improve its use performance, the following technical measures can be adopted:

1. Select high purity magnesia and high purity (very low SiO2) chromium ore as raw materials and improve the matching proportion of chromium ore, so as to produce high-quality MgO-Cr2O3 bricks with relatively high Cr2O3 / MgO;

2. Add a certain amount of Cr2O3 powder or chromium ore superfine powder to promote the sintering of MgO-Cr2O3 system materials, and obtain high-quality MgO-Cr2O3 bricks with developed secondary spinel;

3. Add an appropriate amount of Fe-Cr and other metal powder to reduce the stomatal rate of MgO-Cr2O3 bricks and form a microstomatal structure in the substrate through their oxidation when burning;

4. Burn the MgO-Cr2O3 bricks in the oxidation atmosphere under high temperature conditions, and cool them slowly after firing to obtain the developed tissue structure of the secondary spinel crystals;

5. Add a certain number of special admixtures or CaCO3(0.1〜2.0mm with a thermal expansion rate smaller than MgO-Cr2O3 bricks) and additives such as ZrO2 to improve the thermal shock resistance of MgO-Cr2O3 bricks.

By adopting the above measures, high-quality MgO-Cr2O3 bricks with high high temperature strength, excellent erosion resistance and high thermal stability can be made.