The Fuse-Rebonded Magnesia-Chrome Brick is also called fused grain magnesia chrome brick. High temperature performance is between fused cast magnesia chrome brick and sintered magnesia chrome brick, and its load softening temperature can reach 1700 degrees Celsius

Application of  Fuse-Rebonded Magnesia-Chrome Brick in copper converter
The use of high-performance magnesia-chrome bricks in the tuyere of the copper converter has been widely promoted. The tuyere area is the most vulnerable part of the copper converter. The main reasons are:
(1) The operating temperature of this part is relatively high, and the temperature fluctuation is large. The temperature change rate before and after the addition of the copper crucible reaches 40 ° C / min or more;
(2) erosion, infiltration of high temperature melts and erosion of gases and melts;
(3) The adoption of new smelting technologies, such as the use of oxygen-enriched blowing technology in the 1990s, made the use of refractory materials in this area more demanding. Therefore, only by continuously improving the magnesium chrome bricks in this part can we adapt to the development of converter smelting technology and improve the service life of the converter.
 

Technology

Application of  Fuse-Rebonded Magnesia-Chrome Brick

At present, refractory materials for RH furnaces are mainly Fuse-Rebonded Magnesia-Chrome Brick. Compared with other refining equipments, RH vacuum chambers are refractory materials in addition to high temperature steel water and slag during the treatment process. They also suffer from high-speed erosion of steel and rapid temperature changes. Therefore, more stringent requirements are imposed on refractory materials. However, with the increase of smelting strength and the continuous change of smelting steel grades, the service life of existing magnesia chrome bricks can no longer meet the requirements of energy saving and consumption reduction. In order to solve this problem, the development of the original magnesia chrome bricks has been carried out to produce high-performance Fuse-Rebonded Magnesia-Chrome Brick, and good results have been obtained in Baosteel's furnace application.

In order to improve the performance of the existing Magnesia-Chrome Brick, fused fused chrome sand and chrome ore with high Cr2O3 content and high purity are the main raw materials. The effects of Cr2O3 content and additives such as high-purity magnesia, TiO2 and Cr2O3 micropowder on the properties of magnesia-chrome bricks were studied.