Structural characteristic of natural siderite during thermal treatment

被引：0

作者：

Xing B. ^{[1
]}

Chen T. ^{[1
]}

Qing C. ^{[1
,2
]}

Liu H. ^{[1
]}

Xie Q. ^{[1
]}

Xie J. ^{[1
]}

机构：

[1] Laboratory for Nanomineralogy and Environmental Material, School of Resources & Environmental Engineering, Hefei University of Technology, Hefei

[2] School of Material Science Chemical Engineering, Chuzhou University, Chuzhou, 239000, Anhui

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2016年 / 44卷 / 08期

关键词：

Heat treatment; Hematite; Nano-mineral; Siderite; Specific surface area;

D O I：

10.14062/j.issn.0454-5648.2016.08.18

中图分类号：

学科分类号：

摘要：

The structure of natural siderite after annealing at different temperatures and durations was investigated. The results show that divalent iron in siderite is oxidized to ferric iron, forming a conjugate at 430℃ and releasing a small amount of CO2 simultaneously. As a results, the porous structure (beaded string) occurs on the surface of siderite, which the pore sizes are in nanoscale. When the temperature increases to 460℃, the conjugates release a great amount of CO2 and transforms into hematite. In addition, annealing temperature and time both affect the specific surface area and pore structure of the corresponding annealed product as the temperature changes from 400 to 600℃ and the time ranges from 10 to 60 min. In particular, the specific surface area of annealed product increases to 57.5 m2/g at 470℃. The grain size of hematite increases with increasing the temperature and time. The decreased internal voids and the increased aperture increase with increasing the temperature and time, leading to the decreased specific surface area. The nano-porous material with the great specific surface area can be prepared through annealing siderite at 450-500℃. © 2016, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.

引用

页码：1207 / 1212

页数：5

共 21 条

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