Development of molten cast magnesium chrome refractory

In the conventional fired refractory material, there are a certain amount of micropores and microcracks between the refractory materials. These micropores and microcracks can absorb the thermal stress in the warm solution zone at high temperatures, but at the same time bring some disadvantages, that is, very easy Excreted by the osmosis slag. Compared with the steel industry, non-ferrous smelting has a relatively low smelting temperature, but a large amount of slag. The slag is a highly corrosive ferrite or silicate. The slag has low viscosity and small interfacial tension. Invasive and osmotic excretion. Therefore, after the fired refractory material is used in the non-ferrous smelting furnace, the osmotic excretion metamorphic layer is thicker than the force, and the layout is loose, the strength falls, and the peeling is easily damaged. The slag osmosis excretion causes layout spalling to be the important reason for the high smelting refractory material and low life.
 

The molten cast magnesia chrome brick has peculiar goodness compared to the damage mechanism of slag osmosis and excretion. Since it is a dense frit made by melting, pouring and group cooling, the slag can only be etched in the appearance of the brick. The osmotic excretion sign is not presumably present (this has been proven by the use of the cast-molded magnesia-chrome brick section). Therefore, it is difficult and costly to cast and cast magnesia-chrome bricks. In the developed countries, the key parts of the non-ferrous smelting furnaces still contain the upper-hand positions that other refractory materials cannot replace.

Oxygen-rich flash smelting and oxygen-rich molten pool smelting are the smelting skills of non-ferrous metals in the international ancestors; the smelting new skills are characterized by oxygen-enriched blasting and intensive smelting, whereby the lining refractory material is subjected to very demanding utilization. Conditions, the existing refractory materials in the sea are also difficult to satisfy these utilization requirements. At the same time of opening up and introducing the smelting skills of the ancestors, the development of refractory materials for the development of oxygen-rich smelting skills is divided into the melting of magnesia-chrome bricks. It is necessary to digest and absorb the imported skills and accelerate the localization process.
 

The production process of fused cast magnesia chrome bricks is completely different from the general sinter refractory production method. It uses magnesia and chrome ore to participate in a certain amount of admixture, confuses the ingredients, melts in the electric arc furnace, casts into the mold, and controls the cooling and annealing. Produce into mother bricks, cut, grind, drill, and cold work to produce the necessary brick type.

 

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