Fire Bricks

  We analyze the erosion mechanism of   magnesia carbon bricks   from the aspects of slag, carbon content and carbon structure in magnesia-carbon bricks, raw materials of magnesia-carbon bricks, and additives in MgO-C Brick, and get the erosion of magnesia-carbon bricks. The damage process mainly includes the following: oxidation-decarburization-porosity-erosion-erosion-shedding-damage. In this process, due to the oxidative removal of carbon, the brick structure becomes loose and brittle, and it is worn out under the erosion of molten steel. At the same time, due to the oxidative removal of carbon and the loose brick body, the slag penetrates into the decarburized layer, and Reacts with magnesia particles. 1. Erosion of refined slag The ladle undergoes LF and VD refining treatment, and is affected by arc light, vacuum and steel slag erosion, which accelerates the erosion of the slag line. Calcium oxide, silicon dioxide and other substances in the slag chemically react wit...

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...