Phase transitions relating to the pozzolanic activity of electrolytic manganese residue during calcination
Electrolytic manganese residue (EMR) is generated from electrolytic manganese metal (EMM) industry,and its disposal is currently a serious problem in China.EMR were calcined in the interval 100-900℃ to enhance their pozzolanic activity and characterized by DTA-TG,XRD,FTIR and chemical analysis techniques with the aim to correlate phase transitions and structural features with the pozzolanic activity of calcined EMR.From the phase analysis and compressive strength results,it is found that the EMR calcined within 700-800℃ had the best pozzolanic activity due to the decomposition of poorly-crystallized CaSO4 under the reducing ambient created by the decomposition of (NH4)2SO4.The appearance of reactive CaO mainly contributes to the good pozzolanic activity of EMR calcined within 700-800℃.The crystallinity of Mn3O4 increases leading an unfavourable effect on the pozzolanic behaviour of EMR calcined at 900℃.The developed pozzolanic material containing 30% EMR possesses compressive strength properties at a level similar to 42.5# normal Portland cement,in the range of 41.5-50.5 MPa.Besides,leaching results show that EMR blend cement pastes have excellent effect on the solidification of heavy metals.
Electrolytic manganese residue phase transition calcination pozzolanic activity recycling
Liu Xiaoming Li Yu Zhang Lingling Cang Daqiang Zhou Sixun
State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 1 State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 1 Civil and Environmental Engineering School, University of Science and Technology of Beijing, Beijing School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Be
国际会议
上海
英文
12-12
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）