CORRELATION OF THE COMPONENTS OF PORTLAND CEMENT CLINKER AND SINTERING PROCESS BY MEANS OF XRD QUANTITATIVE ANALYSIS

In this paper,the cement clinkers fromvarious industrial kilns were investigated by a superposingpeaks method for X-ray quantitative analysis(XRQA)ofclinker minerals,the results show that the clinker mineralcontents measured by XRQA method better accord with thereality of clinkers made in different conditions than theo-retic contents calculated by Bouge formula do.The mea-sured contents of C_3S of clinkers manufactured in rotarykilns are higher than theoretically calculated values,where-as,the results of clinker manufactured in shaft kilns arecontrary to that.This is because in rotary kiln,the rawmeals are fully pre-heated and have high sintering temper-ature,the clinkers are well solid-solutioned and rapidlycooled,on the contrary,owing to the struetural defects,it iseasy to exist reduing atmosphere and lower temperature inshaft kiln,moreover the cooling rate is slower,all these canevidently lead to worse clinker quality.Adding CaF_2-Ca-SO_4 complex mineralizer can remarkably modify the sinter-ing situat

CORRELATION OF THE COMPONENTS OF PORTLAND CEMENT CLINKER AND SINTERING PROCESS BY MEANS OF XRD QUANTITATIVE ANALYSIS

In this paper, the cement clinkers from various industrial kilns were investigated by a superposing peaks method for X-ray quantitative analysis (XRQA) of clinker minerals, the results show that the clinker mineral contents measured by XRQA method better accord with the reality of clinkers made in different conditions than theo-retic contents calculated by Bouge formula do. The mea-sured contents of C35 of clinkers manufactured in rotary kilns are higher than theoretically calculated values, where-as , the results of clinker manufactured in shaft kilns are contrary to that. This is because in rotary kiln , the raw meals are fully pre-heated and have high sintering temper-ature, the clinkers are well solid-solutioned and rapidly cooled,on the contrary,owing to the structural defects,it is easy to exist reduing atmosphere and lower temperature in shaft kiln,moreover the cooling rate is slower, all these can evidently lead to worse clinker quality. Adding CaFz-Ca-SO4 complex mineralizer can remarkably modify the sinter-ing situation in shaft kiln,especially can evidently increase C3S content and make it -well crystallized, therefore, im-prove the sintered aualitv of clinker.