PREPARATION OF ONE-PART GEOPOLYMER FROM THERMAL-ALKALI ACTIVATED RED MUD
Red mud,a high-volume industrial waste generated worldwide through the Bayer digestion process,has recently drawn attention as a suitable precursor for production of geopolymers.However,in seeking high-volume production and utilisation of this material in valuable applications,the reactivity of red mud needs to be better controlled,and particularly the availability of aluminium must be enhanced.In this study,a just add water geopolymer precursor has been produced through an alkali-thermal activation method,to avoid the need for addition of a secondary alkaline solution in preparing geopolymers.The results show the incorporation of alkalis during the thermal activation at 800℃ of red mud favours the formation of hydraulic tricalcium aluminate (C3A),and a peralkaline aluminosilicate which contains excess alkalis in its solid form and improves the availability of A1 during the hydration process.The formation of zeolite Na-A and double ring structural Si-O-Si bonds indicate that reaction of the one-part geopolymer is effectively occurring upon hydration.
Red mud thermal-alkali activation one-part geopolymer
Xinyuan Ke Nan Ye Susan A.Bernal John L.Provis Jiakuan Yang
Department of Materials Science and Engineering,University of Sheffield,Sheffield S1 3JD,United King School of Environmental Science and Engineering,Huazhong University of Science & Technology,Wuhan 43 Department of Materials Science and Engineering,University of Sheffield,Sheffield S1 3JD,United King
国际会议
长沙
英文
127-134
2014-06-01（万方平台首次上网日期，不代表论文的发表时间）