At present, combined with Mg-Cr2O3 brick, direct combination with Mg-Cr2O3 brick is the main material of firing furnace of AOD furnace and large-scale cement kiln in China. This brick has a load softening temperature, high temperature strength, high temperature stability and good volume characteristics. 

However, the use of Mg-Cr2O3 bricks as AOD furnace linings and large cement kilns can lead to environmental pollution; non-continuous erosion and anti-spalling properties are not ideal; chromium in Mg-Cr2O3 bricks will be absorbed by the molten steel, resulting in Chromium content of chromium in molten steel is difficult to control; at the same time, domestic chromite resources are relatively scarce, with low grade, high content of harmful impurities SiO2, and high price. 

Europe, Japan and other countries out of resources and environmental considerations, almost all AOD furnaces are made of magnesium dolomite refractory lining material. In the future, refractory materials that pollute the environment will no longer be produced and import restrictions will be imposed. 

With China's accession to the WTO, the quality of national environmental protection and environmental requirements will certainly be higher and higher. Taking into account the limited resources and long-term development needs, environmentally friendly products will surely become the mainstream of the future.