Erosion of MgO-CaO bricks by stainless steel AOD high-silicon smelting process
In order to investigate on erosion of stainless steel AOD high silicon smelting process on MgO-CaO bricks,the observation,chemical analysis and XRD analysis on stainless steel AOD slag in desilication period,the appearance of the used and unused MgO-CaO bricks,combined with microstructural analysis and thermodynamic calculations were studied.It was found that stainless steel AOD slag in desilication period produced by the AOD high silicon smelting process is glassy phase with basicity of 1.02.The effect of tricalcium silicate on MgO-CaO bricks is less than that of dicalcium silicate.Stainless steel AOD slag in desilication period can produce dicalcium silicate;stainless steel AOD slag in reduction period can produce tricalcium silicate;and stainless steel AOD slag in desilication period is more erosive than stainless steel AOD slag in reduction period to MgO-CaO bricks.When the refractories mass fraction is 100％,the erosion content of stainless steel AOD slag in desilication period is 53.8％,and the resulting slag mass fraction is 36.7％.The erosion content of stainless steel AOD slag in reduction period without stainless steel AOD slag in desilication period is 35.1％,and the resulting slag mass fraction is 25.0％.When refractory materials react with stainless steel AOD high silicon slag and then react with stainless steel AOD reduction slag,the corrosion mass fraction of stainless steel AOD reduction slag is 46.2％,and the slag mass fraction produced is 87.8％.Therefore,the double slag smelting caused by high silicon smelting process has the greatest impact on magnesia calcium bricks.
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