Environmental effects of coal gangue and its utilization

ABSTRACT

Coal gangue has accumulated huge coal gangue piles, occupying lots of land as well as having striking influence on the neighboring environmental effects. This paper seeks a new way of coal gangue treatment in which the coal gangue blended with shale and sludge was sintered in rotary kiln to form lightweight aggregates. The results show that the optimum mixture ratio of coal gangue, shale, and sludge is 50, 40, and 10 wt% and the corresponding indicators of aggregates obtained are: (a) bulk density of 658 kg/m³, (b) granule strength of 643N, (c) 1 h absorption water to be 13.8%.

KEYWORDS:

• Coal gangue
• environmental effects
• utilization
• lightweight aggregates
• natural resources

Acknowledgment

The technical cooperation of the RTAL Company, Hong Kong, is greatly appreciated.

Funding

Ths work was supported by Chongqing Science & Technology Committee, China (No.CSTC.2011AC7065); the Young People Fund of Hunan Education Department (grant number 14B159), and the National Natural Science Foundation of China (grant number 11605087). All the support is greatly appreciated.

Additional information

Funding

Ths work was supported by Chongqing Science & Technology Committee, China (No.CSTC.2011AC7065); the Young People Fund of Hunan Education Department (grant number 14B159), and the National Natural Science Foundation of China (grant number 11605087). All the support is greatly appreciated.