Preparation and properties of high magnesium ferronickel slag based-oxalate chemically bonded ceramics materials
FU Yizhong1,, ZHOU Xintao1, LUO Zhongqiu1,2,,, LIU Jiahui1, MA Yue1, WANG Luxing1 1.Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China 2.Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming University of Science and Technology, Kunming 650500, China
Abstract:In order to improve the comprehensive utilization of ferronickel slag (FS), the ferronickel slag based-oxalate chemically bonded ceramics materials (FS-OCBCMs) were prepared through the reaction of FS and oxalic acid (OA). In this study, the effects of mass ratio of m(FS/OA), water-cement ratio m(W/C), fly ash (FA), retarder type and content on the setting time and mechanical properties of FS-OCBCMs were investigated. Additionally, the phase compositions and microstructures of FS-OCBCMs were characterized by XRD and SEM. The results showed that with the increase of m(FS/OA), the setting time decreased first and then increased, and the compressive strength increased first and then decreased. When m(W/C) was 0.14~0.17, the compressive strength of FS-OCBCMs reached 33 MPa or more at the age of 28 d. When m(W/C) was over 0.17, its compressive strength decreased accordingly. The content of FA had a great influence on the early compressive strength. The early compressive strength decreased with the increase of FA, while the later compressive strength of FS-OCBCMs was close to that without FA. The incorporation of borax (B) resulted in good retarding effect of FS-OCBCMs, at the B incorporation content of 1%, the best mechanical properties of FS-OCBCMs were achieved, compressive strength could reach 45 MPa after curing 28 d. However, the addition of tripolyphosphate (P) in FS-OCBCMs had no retarding effect, but also greatly reduced the setting time, the setting time decreased to 14 minutes at the P content of 5%, which had a great influence on the early strength of FS-OCBCMs. The main product of FS-OCBCMs was MgC2O4·2H2O with good crystallinity. 1% B addition would lead to a better crystallized product and improve the compressive strength of FS-OCBCMs. This study will provide reference for the realization of resource utilization of high magnesium ferronickel slag in a certain degree. Key words:ferronickel slag/ oxalic acid/ oxalate chemically bonded ceramics materials/ compressive strength/ retarding.
图1FS的XRD图谱 Figure1.XRD patterns of ferronickel slag (FS)
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1.Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China 2.Higher Educational Key Laboratory for Phosphorus Chemical Engineering of Yunnan Province, Kunming University of Science and Technology, Kunming 650500, China Received Date: 2019-06-20 Accepted Date: 2019-09-11 Available Online: 2020-03-25 Keywords:ferronickel slag/ oxalic acid/ oxalate chemically bonded ceramics materials/ compressive strength/ retarding Abstract:In order to improve the comprehensive utilization of ferronickel slag (FS), the ferronickel slag based-oxalate chemically bonded ceramics materials (FS-OCBCMs) were prepared through the reaction of FS and oxalic acid (OA). In this study, the effects of mass ratio of m(FS/OA), water-cement ratio m(W/C), fly ash (FA), retarder type and content on the setting time and mechanical properties of FS-OCBCMs were investigated. Additionally, the phase compositions and microstructures of FS-OCBCMs were characterized by XRD and SEM. The results showed that with the increase of m(FS/OA), the setting time decreased first and then increased, and the compressive strength increased first and then decreased. When m(W/C) was 0.14~0.17, the compressive strength of FS-OCBCMs reached 33 MPa or more at the age of 28 d. When m(W/C) was over 0.17, its compressive strength decreased accordingly. The content of FA had a great influence on the early compressive strength. The early compressive strength decreased with the increase of FA, while the later compressive strength of FS-OCBCMs was close to that without FA. The incorporation of borax (B) resulted in good retarding effect of FS-OCBCMs, at the B incorporation content of 1%, the best mechanical properties of FS-OCBCMs were achieved, compressive strength could reach 45 MPa after curing 28 d. However, the addition of tripolyphosphate (P) in FS-OCBCMs had no retarding effect, but also greatly reduced the setting time, the setting time decreased to 14 minutes at the P content of 5%, which had a great influence on the early strength of FS-OCBCMs. The main product of FS-OCBCMs was MgC2O4·2H2O with good crystallinity. 1% B addition would lead to a better crystallized product and improve the compressive strength of FS-OCBCMs. This study will provide reference for the realization of resource utilization of high magnesium ferronickel slag in a certain degree.
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