Influencing Factors of Coal Gangue Carbothermal Reduction and Nitridation Reaction

Abstract:

nfluencing factors of target products such as X phase, β-SiAlON phase and O-SiAlON phase of Inner Mongolia coal gangue carbothermal reduction and nitridation were researched by calculating the loss rate on ignition of specimens, and by means of XRD and SEM. During the carbothermal reduction and nitridation reaction of coal gangue, the loss rate on ignition of specimens rises with carbon reducer increasing, and keeping time has a little influence on the loss rate on ignition of specimens. If β-SiAlON is target phase, the yield from corundum is much higher than that from special grade bauxite. Corundum or bauxite is used as starting material, the yield of X phase is low and the highest yield is only 12.88%. For the carbothermal reduction and nitridation reaction of coal gangue, the appropriate addition of reducer carbon is 10%-16%, and temperature influence is larger. The reaction temperature over 1420°C and keeping time of 6h are beneficial to the formation of X phase, β-SiAlON and O-SiAlON.

• Periodical: Advanced Materials Research (Volume 815)
• Pages: 886-892
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.815.886
• Online since: October 2013
• Authors: Feng Duan, Ai Qiong Ma, Guo Qing Xiao, Xiao Hui Zhang, Ren Hong Yu
• Keywords: Carbothermal Reduction, Coal Gangue, Influencing Factor, Nitridation Method, O-SiAlON, β′-SiAlON

References

[1] Lee J G: Sinterable SiAlON powder by reaction of clay with carbon and nitrogen. Am. Ceram. Soc. Bull. 58(1979), pp.869-872.

[2] Yu Sansan, Du Xinghong, Li Yongrui, et al: Progress in the synthesis of β'-SiAlON by carbothermal reduction and nitridation from natural raw material. Bull. Chin. Ceram. Soc. 25(2006), pp.111-115, 135.

[3] Yu Sansan, Du Xinghong, Li Yongrui, et al: Progress in synthesis reaction dynamics of β'-SiAlON by carbothermal reduction and nitridation with natural raw materials. Naihuo Cailiao (Refract., Chinese version). 40(2006), pp.126-132.

[4] Zhang Haijun, Liu Zhanjie, Zhong Xiangchong: Thermodynamic study and reduction-nitridation synthesis of O'-SiAlON from coal gangue. J. Inorg. Mater. 19(2004), pp.1129-1137.

[5] Zhen Qiang, Wang Fuming, Li Wenchao: Assessment and prediction of thermodynamic property of compounds in SiAlON system. Chin. J. Rare. Met. 23(1999), pp.254-257.

[6] Huang Zhaohui, Sun Jialin, Wang Jinxiang, et al: β'-SiAlON materials prepared at 1500oC by industrial process. Naihuo Cailiao (Refract., Chinese version), 35 (2001), pp.125-127.

[7] Wan Long, Yin Bin, Yu Shun: Reaction analysis of SiAlON powder prepared by carbothermal reduction and nitridation method. J. Hunan. Univ. (Nat. Sci. ), 30(2003), pp.31-34.

[8] Wang Ruisheng, Gu Xiaohua, Wang Zhisheng: Technical condition of β'-SiAlON material prepared by carbothermal reduction and nitridation method. Naihuo Cailiao (Refract., Chinese version), 41(2007), pp.50-53.

[8] Chen Nanchun, Liang Guizhang, Xu Fengping: Influencing factors of the preparation of β'-SiAlON powder by Kaolin. J. Chin. Ceram. Soc. 36(2008), pp.113-116.

[9] Hong Yanruo, Sun Jialin: Non-oxides Bonded Refractories [M]. Beijing: Metallurgy Industry Press. (2003), pp.50-60.

[10] Hou Xinmei, Xu Enxia, Wang Xidong: Applications of thermodynamics and its parameter state diagram in synthesis of SiAlON. Naihuo Cailiao (Refractories, Chinese version), 40 (2006), pp.136-138, 144.

[11] Zhang Haijun, Liu Zhanjie, Zhong Xiangchong: Synthesis of O'-SiAlON powder by reduction nitridation method. J. Chin. Ceram. Soc, 32(2004), pp.1189-1193.

[12] Luo Xingyuan, Sun Jialin, Deng Chengji, et al: Synthesis of β'-SiAlON from coal gangue. J. Mater. Sci., 19 (2003), pp.93-96.

[13] Liu Zhongyi, Sun Hongwei, Zhong Xiangchong. Phase transformations in the process of carbothermal reduction nitridation reaction of Kaolin. Naihuo Cailiao (Refract., Chinese version), 38 (2004), pp.18-20.