A STUDY THE MANUFACTURE OF CLINKER USING LOW GRADE LIMESTONE AND WASTE PAPER SLUDGE

초록

This study was carried out to manufacture portland cement clinker using low geade limestone and waste paper sldge.Waste paper sludges were added to supply CaO component in low grade limestone,bacause low grade limestone contains relatively poor CaO.Raw materials sucs as limestone,clay and iron-ore were obtained in Ssangyon cement in Donghae,waste paper sludge in Samil paper.Composition and texture of raw materials and cement minerals were investigated by XRE,XRD and DTA,etc. Portland clinker was made as follows.Modulus of mixture of raw materials was fixed in LSF=94.0,SM=2.40,IM=1.70,Raw materials are crused,mixed and ground to fine powder,then put into furnace where it is heated to burning temperature.In here,CaF2 as a fluxing agent was used to facilitate burning. From the experimental results it appears CaF2 promotes that produces C2S at relatively low temperature of 1,100℃.Cement minerlas were produced as C2S at 1,100℃ and C3S at 1,200℃. Also it was found that when water is added to cement minerlas,there follows formation of cement hydrates such as C-S-H and ettrinhite.