不同脱氯工艺提钛尾渣对水泥浆体性能的影响  

Effect of Ti-extracted Slag with Different Dechlorination Processes on Prop⁃erties of Cement Paste

作　　者：王淑萍[1] 钟静雄 徐银清 辛云涛 吕学伟[1] 曾冠武 WANG Shuping;ZHONG Jingxiong;XU Yinqing;XIN Yuntao;LÜXuewei;ZENG Guanwu(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,China;State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,China;Sichuan Institute of Building Research,Chengdu 610000,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]中南大学化学化工学院,湖南长沙410083 [3]钒钛资源综合利用国家重点实验室,四川攀枝花617000 [4]四川省建筑科学研究院有限公司,四川成都610000

出　　处：《湖南大学学报(自然科学版)》2025年第3期180-188,共9页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(52204415);中央在川高校院所重大科技成果转化项目(2022ZHCG0123)。

摘　　要：提钛尾渣是含钛高炉渣提钛后所排放的废渣,具有潜在水硬活性,但因含有氯离子,其资源化利用受到限制,需进一步脱氯处理.本文分析了不同脱氯工艺下提钛尾渣的掺量对水泥浆体的性能影响.结果表明,掺入提钛尾渣会降低水泥浆体的流动性;提钛尾渣中的氯离子对水泥浆体有促凝作用,且随着掺量的增加,凝结时间缩短明显.在相同掺量下,几种不同脱氯工艺的提钛尾渣按对水泥浆体凝结时间的缩短程度从大到小排序为:未脱氯渣>水洗脱氯渣>煅烧脱氯渣.掺入20%以内提钛尾渣对水泥浆体强度影响较小,但当掺量进一步提高时,强度逐渐下降.提钛尾渣中的氯离子主要以Friedel盐形式存在于水泥浆体中;掺入提钛尾渣后水化产物的Si―O键伸缩振动峰向低波数方向偏移.提钛尾渣的推荐掺量范围为10%~20%.The Ti-extracted slag is a by-product of Ti-bearing blast furnace slag after further extraction of titanium,and it has potential cementitious reactivity.However,due to the presence of chloride ions,its utilization in construction is limited.Therefore,further dechlorination treatment is needed.In this study,the effect of Ti-extracted residues with different dechlorination methods on the properties of cement paste was investigated.Results showed that the addition of Ti-extracted slag can reduce the fluidity of cement paste.The presence of chloride ions can shorten the setting time of the paste,and a higher amount of the slag resulted in a shorter setting time.At the same content of the residues,the shortening degree of setting time of the slag under the different dechlorination methods was obtained as follow:non-dechlorinated slag>water-washed slag>calcined slag.No obvious change in the compressive strength of the paste was observed by adding 20%Ti-extracted slag,but further increase in the content can probably reduce the strength.Chloride ions in the Ti-extracted slag were combined in the Friedel salt of the cement paste.After adding Ti-extracted slag,the stretching vibration peak of the Si—O bond shifted to a lower wavenumber.10%~20% of Ti-extracted slag in the cement paste is recommended.

关 键 词：提钛尾渣 脱氯 水泥浆体 凝结 抗压强度 微观结构 

分 类 号：TU528.09[建筑科学—建筑技术科学]