A New Comprehensive Utilization Method for Coal Gangue: Preparing Alite-Sulphoaluminate Cement

Author:

Xu Guan Li1,Sun Chuan Min1,Sun Yao1,Liao Hai2

Affiliation:

1. Chengdu University of Technology

2. Mineral resources reserves evaluation center of Sichuan Province

Abstract

Coal gangue is a kind of solid waste which is discharged from coal mining and coal washing. Dumped gangues do not only take a large land occupation but also pollute air and water. Treatment and utilizing of coal gangues has become the major issue for the coal industry to resolve. As major experimental material in this study, the coal gangue from Dawukou, Shizuishan, Ningxia province, China had been analyzed to have high-alumina content, and it could been used as alumina constituent for the preparation of sulphoaluminate cement. In this paper, alite-sulphoaluminate cements were prepared at 1330°C using coal gangue, limestone and gypsum as major main materials, fluorite and barite as minor materials. The result shows that major clinker minerals of the cement are sulphoaluminate, alite and belite, while major hydrate is ettringite, compressive strength of the cement is 48.9MPa after 7d. These experiments provide a new method of coal gangue comprehensive utilization.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference7 articles.

1. Qian Mingao: China Coal, No. 6 (2005), pp.5-9 (In Chinese).

2. Song Zhicheng, Zhou Xiujie, Wan Xuezhi: 2012-2016 Gangue industrial investment analysis and forecast report of China, (2012) (In Chinese).

3. Zuo Pengfei: Coal Technology, Vol. 28, No1 (2009), pp.186-188 (In Chinese).

4. Gao Xia: Research of Utilizing Coal Gangue in Shi Zuishan District to Produce Sulphoaluminate Cement, (2008) (In Chinese).

5. Wang Guoping, Sun Chuanmin, Zang Pingping, et. al.: Geological Review, Vol. 51, No. 5 (2005), pp.600-605 (In Chinese).

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