Conversion of Metallurgical Waste:The Impact of Reduction Ferrum Extraction on the Phase Composition and Cementitious Materials Reactivity of Jinchuan Ferronickel Slag  

作　　者：SONG Yanning FENG Qiong QIAO Hongxia WEI Chao ZHENG Jianghua 宋彦宁;冯琼;乔宏霞

机构地区：[1]School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China [2]State Key Laboratory for Comprehensive Utilization of Nickel and Cobalt Resources,Jinchang 737100,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2025年第2期546-557,共12页武汉理工大学学报(材料科学英文版)

基　　金：Funded by the Science and Technology Program of Gansu Province(Nos.23JRRA799 and 24JRRA213);the National Natural Science Foundation of China(Nos.52178216,52008196,and U21A20150)。

摘　　要：In order to avoid the waste of iron caused by the direct use of ferronickel slag(FNS)in building materials,the effects of reduction iron extraction on the physical and chemical properties,cementitious reactivity and hydration reaction characteristics of FNS and ferrum extraction tailing of nickel slag(FETNS)were studied.The experimental results show that the reduction ferrum extraction method changes the mineral phase composition of the waste slag,breaks the Si-O-Si bond,forms the tetrahedral structure of Si-O-NBO or Si-O-2NBO,and increases the content of active components such as Ca,Si,Mg,and Al.Compared with FNS,the 28 d compressive strength of pastes prepared by FETNS increases by 16.12%,22.57%,33.13%,44.26%,and 57.65%,respectively.The degree of hydration reaction of the composite cementitious systems in the FETNS group is higher than that in the FNS group at different ages,and the content of hydration products such as C-S-H gel and ettringite(AFt)is also higher than that in the FNS group.More hydration products can improve the curing ability to Cr and Mn of the composite cementitious systems in the FETNS group,and reduce the leaching value of Cr and Mn.

关 键 词：ferronickel slag reduction ferrum extraction physical and chemical properties cementitious material 

分 类 号：R74[医药卫生—神经病学与精神病学]