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Advances in Materials Science and Engineering
Volume 2016, Article ID 6465983, 13 pages
http://dx.doi.org/10.1155/2016/6465983
Research Article

Coal and Gangue Underground Pneumatic Separation Effect Evaluation Influenced by Different Airflow Directions

1College of Mechanical and Electrical Engineering, China University of Mining and Technology, Xuzhou 221116, China
2Department of Metallurgical Engineering, College of Mines and Earth Sciences, University of Utah, Salt Lake City, UT 84112-0114, USA

Received 23 June 2015; Accepted 9 November 2015

Academic Editor: Charles C. Sorrell

Copyright © 2016 Kehong Zheng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Coal and gangue underground pneumatic separation is of key importance for green mining. Two kinds of arrangement schemes for high-pressure value used in pneumatic separation system are proposed in this study. Pneumatic separation effects are examined under different arrangement of high-pressure value. Here, theoretical pneumatic separation distance formulas of mineral particles affected by different airflow directions are derived and validated by a series of numerical simulations and orthogonal experiments. In the following analysis, the effects of gangue diameter (), conveyor velocity (), and the height difference between conveyor belt and air nozzle () are mainly considered. The numerical simulation and experimental results indicate that pneumatic separation effects under the condition of and being in the opposite direction will be better than that of and being in the same direction. The pneumatic separation distance shows a decreasing trend with the increasing of the three factors. The study also shows that gangue diameter has the most significant influence on separation distance, followed by conveyor velocity and height difference .