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The thermochemical activity of dolomite occurred in dolomite–palygorskite
Abstract Dolomite–palygorskite (DP) composed of dolomite and palygorskite is a kind of special palygorskite. In this work, the phase, microstructure, and morphology of DP were characterized before and after calcination using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). Additionally, the process of thermal decomposition of DPC was determined by thermal gravity (TG) and differential thermal gravity (DTG) analysis and was compared with that of common dolomite. The results showed that the decomposition temperature of dolomite occurred in DPC started at 500°C and ended at 780°C, with a maximum peak at 745°C. The decomposition temperature of dolomite in DPC was found to be 50°C lower than that of common dolomite. Two reasons may explain this phenomenon. One involved the nano-effect of DPC caused by the nanoscale of dolomite in DPC and the special embedded structure between dolomite and palygorskite. The other was contributed to the reaction of carbonate with silicate enhancing the decomposition of dolomite in DPC.
Graphical abstract Display Omitted
Highlights Decomposition temperature of dolomite in DCP is 50°C lower than common dolomite. Combination of SiO2 and CaO reduces the decomposition temperature of carbonate. Nanoeffect of minerals in DCP is one reason for the unexpected thermal reactivity. Intergrowth structure of palygorskite and dolomite promotes combination reaction.
The thermochemical activity of dolomite occurred in dolomite–palygorskite
Abstract Dolomite–palygorskite (DP) composed of dolomite and palygorskite is a kind of special palygorskite. In this work, the phase, microstructure, and morphology of DP were characterized before and after calcination using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and transmission electron microscopy (TEM). Additionally, the process of thermal decomposition of DPC was determined by thermal gravity (TG) and differential thermal gravity (DTG) analysis and was compared with that of common dolomite. The results showed that the decomposition temperature of dolomite occurred in DPC started at 500°C and ended at 780°C, with a maximum peak at 745°C. The decomposition temperature of dolomite in DPC was found to be 50°C lower than that of common dolomite. Two reasons may explain this phenomenon. One involved the nano-effect of DPC caused by the nanoscale of dolomite in DPC and the special embedded structure between dolomite and palygorskite. The other was contributed to the reaction of carbonate with silicate enhancing the decomposition of dolomite in DPC.
Graphical abstract Display Omitted
Highlights Decomposition temperature of dolomite in DCP is 50°C lower than common dolomite. Combination of SiO2 and CaO reduces the decomposition temperature of carbonate. Nanoeffect of minerals in DCP is one reason for the unexpected thermal reactivity. Intergrowth structure of palygorskite and dolomite promotes combination reaction.
The thermochemical activity of dolomite occurred in dolomite–palygorskite
Xie, JingJing (Autor:in) / Chen, Tianhu (Autor:in) / Xing, Bobo (Autor:in) / Liu, Haibo (Autor:in) / Xie, Qiaoqin (Autor:in) / Li, Hongwei (Autor:in) / Wu, Yucheng (Autor:in)
Applied Clay Science ; 119 ; 42-48
05.07.2015
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
The thermochemical activity of dolomite occurred in dolomite–palygorskite
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