STUDY CONCERNING ESTIMATION OF SINTERED TEMPERATURE OF CLINLER BY RE-SINTERING CLINKER

Abstract

Cement industry has much contributed to recycling of waste material and by-product, through its characteristics such as no generation of secondary waste material and high temperature process. Waste material and by-product have been diversified year by year according to the increase of their recycling amount. As dealing with diversified wastes, it has become more important to control kiln condition in order to maintain clinker quality. Though the indexes such as an electric load factor of the kiln and gas temperature would be useful to control the kiln condition, it is difficult to measure the temperature of the highest temperature region in the kiln directly, which would be the most important factor to control clinker sintering. In this study as clinker analysis method, it became clear that the porosity of clinker depends on sintering temperature rather than sintering retention time. Therefore, it was able to be estimated that the porosity of clinker which had been sintered before would be influenced by re-sintering temperature. As a result, it was found that the porosity ratio of clinker was changed in case the re-sintering temperature was over the previous sintering temperature. Thus, it is able to be considered that the estimation of sintered temperature of clinker would be possible in this method.