The synergistic effect of co-doping of fluorine and various heavy metal ions on the formation and hydration process of C2S
HAO Jianheng
DA Yongqi
HE Tingshu
DU Huan
Abstract：The co-processing technology of cement kiln is expected to realize the high-value utilization of fluorine-containing sludge.However,CaF2 and a variety of impurity heavy metal ions containeal in the fluorine-containing sludge has a certain miner-alization effect,which is easy to cause the performance of the prepared cement clinker to fluctuate and difficult to control stably.In view of this,this paper systematically explored the synergistic effect of CaF2 and various heavy metal ions in fluorine-containing sludge on the formation and hydration characteristics of tricalcium silicate(C3S),the main mineral of cement clinker.The results show that compared with CaF2 single doping or multiple heavy metal ions co-doping,the co-doping can significantly reduce the content of f-CaO in C3S,promote the transformation of C3S from low symmetry to high symmetry,refine the particle size,and in-crease the number of apparent defects.The co-doping of CaF2 and various heavy metal ions can increase the initial hydration rate of C2S and increase the total amount of 3 d hydration heat release of C3S,but it will prolong the end time of the induction period(prolonged about 8.1 h).
Keywords：cement kiln co-processingfluorine-containing sludgetricalcium silicateheavy metal ionshydration reaction
Publication Date：2024-09-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1-9,14 )