The damage mechanism of refractory materials furnace lining

The chemical composition and the damage mechanism of ramming mass, mineral structure,There is a close relationship between the copper smelting process of some very complex factors, so to completely clear in theory is almost impossible.Over the decades, people have done a lot of research on the high temperature physical and chemical reactions between molten steel and refractory materials. However, it can be concluded that it is only macro or empirical.

To sum up the reasons of lining damage can be roughly divided into four types:

Mechanical impact and wear;

Dissolution of refractory materials at high temperature;

High temperature solution infiltration;

The high temperature gas phase evaporation;

The main components of converter slag are Cao, SiO2, FeO and so on,When the slag basicity is low, with Cao, MgO as the main component of lining refractory erosion is serious, the lining life reduced;On the contrary, when the basicity of the slag is high, erosion of the lining is relatively minor, the lining life is relatively improved.Slag containing fluorine ion, manganese ion, or molten pool temperature to L700 Deg. C, the solution viscosity will decrease sharply, damage speed lining up, life is greatly reduced.So the temperature of the molten steel converter is high, will make the lining life reduced accordingly.

The solution is infiltrated into the internal components of the refractory material including:

Slag in the SiO2, Cao, FeO; steel liquid in the Fe, Si, Al, Mn, C, and even metal vapor, CO gas and so on.These infiltrated components are in the capillary channel of refractory materials,The physical and chemical properties of the working surface of the refractory material and the discontinuity of the base of the original refractory material,The emergence of crack in the blast temperature converter operation, and the flaking and loose structure, strictly speaking, the damage process than dissolved damage process is much more serious.

Therefore, to reduce the infiltration solution on refractory measures: A. should reduce the pore lining refractory porosity and porosity;B. in refractory materials and the solution is not easy to wet material, such as graphite, carbon and so on;C. strictly control the viscosity of the solution, namely the control of smelting strength, control the tapping temperature.

The lining of slag resistance test, slag erosion process can be obtained for MgO-C brick: Graphite oxidation and periclase phase is SiO2 in slag, low melting material is to generate Fe2O3 erosion reaction melting loss.

In the carbon containing refractories lining, with the increase of carbon content slag resistance will be improved,but not the carbon content is good, because the carbon content is high, the oxidation of carbon loss after lining refractory is loose, the use effect will become worse.

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