If the refractory life is not increased, it will directly affect the life of the first generation of blast furnace(black aluminum oxide). In order to improve the blast furnace life, ironmaking workers all over the world have done a lot of work. In order to improve the quality of the brick lining and create new varieties, the comprehensive furnace village should be built, the structure and material of the cooling system should be changed or improved, the maintenance and operation should be strengthened, and the amorphous refractories should be used.
The mechanical strength, wear resistance and slag erosion resistance of the thermal insulation refractory are poor, so it is not suitable for the bearing structure of the furnace and the parts directly contacting the slag, charge and molten metal. Thermal insulation refractories are refractories with high porosity, low bulk density and low thermal conductivity. It is mainly used as the lining of high temperature industrial furnace below 1800C and the thermal insulation layer of high temperature thermal equipment.
Magnesia refractories are the most important products of basic refractories. They have high refractoriness and good resistance to basic slag and iron slag. They are important advanced refractories. Magnesia products are mainly composed of various crystals(pink corundum). In ordinary magnesia products, the main crystal phase of periclase is separated by the crystal and glass phase in the matrix composition, so that the network structure of direct combination can not be formed between the periclase grains.
Carbonaceous refractories refer to refractories made of carbon or carbon compounds with different forms of carbon as the main component. According to the composition of the carbon containing raw materials and the mineral composition of the products, the carbon containing refractories can be divided into carbon products, graphite clay products and silicon carbide products, etc. According to the classification of chemical properties, carbon containing refractories belong to neutral refractories. The refractoriness of this kind of material is high.
It can be seen that only the dissolution rate can not indicate the quality of a certain operation condition, because the ore itself will cause the difference of dissolution rate. Generally, the relative dissolution rate is used as one of the standards to compare the effect of various dissolution operation systems(green carborundum). It is the ratio of the actual dissolution rate to the theoretical dissolution rate, that is, when the actual dissolution rate reaches the theoretical dissolution rate, the relative dissolution rate reaches 100%.
However, this effect is obvious only when the particle size of micro powder is less than 5um. When the coarse material is crushed, the impact effect at the initial stage of crushing is very effective, and heavy and large balls are expected. In the later stage of comminution, the grinding effect is the main one, and the smaller ball effect is very good. There are two factors that affect the vibration mill. In addition to the use of wet grinding powder, dry grinding can also be used. The melting temperature of pure carbon is 3500c. In fact, sublimation begins at 3000C.
Considering the uneven mixing under industrial production conditions, the amount of TiO2 can be increased to 0.5%, but in no case should it exceed 1%. At present, some manufacturers of sintered corundum and plate corundum mostly use shaft kiln for calcination(brown fused alumina manufacturer). There is an advantage of using shaft kiln to calcine, that is, the ball material is less damaged in it. To produce corundum products with different density, clinker with different calcination temperature should be selected. In order to eliminate the influence of different grade (A / s) of the ore.