Fire Bricks

Only refractory materials with the following two characteristics can be used as the lining of the VOD furnace: 1) It can resist the erosion of high-temperature slag; 2) It has excellent resistance to spalling in a sudden cold and hot environment. At present, the refractory materials used in VOD furnaces are generally magnesia dolomite bricks and magnesia chrome bricks. 1. Magnesium Dolomite Brick MgO is the main component of magnesia dolomite fire brick . When the impurity elements are less than 1.5%, its high temperature strength will be very good. The magnesium oxide composition of magnesia dolomite bricks designed and produced in Japan and some European countries fluctuates from 60% to 90%, but the sum of magnesium oxide and calcium oxide reaches about 98%. Magnesia dolomite fire bricks have more outstanding thermal shock resistance than magnesia chrome bricks, because the calcium oxide in the refractory bricks can form a new phase with a very high melting point with the slag, and ...

The construction methods of refractory material gunning materials mainly include dry spraying, semi-dry spraying and wet spraying: 1."Dry spraying method" refers to mixing dry powder materials that do not contain moisture in the spraying device and transporting them to the nozzle part before adding water to mix. This is the most traditional spraying construction method. However, due to the disadvantages of uneven mixing of dry powder materials, large amount of dust and material rebound, the technology of wet spraying method came into being; fire brick 2."Wet spray method" means that the dry powder material and water are mixed in the spray device first, and then transported through the piston pump to the nozzle, where compressed air and accelerator are added, and the construction can be carried out. Compared with dry spraying method, wet spraying method can effectively improve the problems of dust and gunning mix material ...... Article source: http://www.chinafire...