Application of used magnesite-chrome bricks in cement kiln to converter patching material was studied.The reduction of Cr6+ to harmless Cr3+,and the effects of the composition based on used magnesite-chrome bricks and silicon powder on the structure and properties of the products were discussed.The samples were undergone heat treatment at 110 °C for 24 h,1100 °C for 3 h,and 1500°Cfor 3h,respectively.Bending strength,compressive strength,apparent porosity,bulk density,and linear change of the samples were determined.The results showed that the sample added with 20％ of used magnesite-chrome bricks had higher strength,volume density and lower porosity.With increasing addition of silica powder the every performance index enhanced.The comprehensive performance reached the best when 3％ of silica powder was added.Using of the used magnesite-chrome bricks from burning zone of cement kiln as converter gum mixture is feasible.
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