Improvement of Iraqi Red Kaolin as a Refractory Material


In this work refractory material was prepared from Iraqi red kaolin with the addition of different proportions of silica and alumina (10, 15, 20 %) for each one and the red kaolin 70%. The powders were mixed in a ball mill, sieved, formed, dried at 110 oC for 8 hrs and then fired at different temperatures 800, 900, 1000 and 1100oC for 2 hrs. The physical properties(linear and volumetric shrinkage ,apparent density and porosity) were calculated from the measured data .It was found that the higher the firing temperature the better the properties of the prepared samples for a given mixture ,the best properties obtained in this work was 70%red kaolin,10%silica and 20%alumina).