Research on the Physical and Chemical Characteristics of Dust in Open Pit Coal Mine Crushing Stations and Closed Dust Reduction Methods

Zhichao Liu, Zhongchen Ao (), Wei Zhou (), Baowei Zhang, Jingfu Niu, Zhiming Wang, Lijie Liu, Zexuan Yang, Kun Xu, Wenqi Lu and Lixia Zhu
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Zhichao Liu: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Zhongchen Ao: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Wei Zhou: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Baowei Zhang: CHNENERGY Investment Group Co., Ltd., Zhunneng Group Co., Ordos 017000, China
Jingfu Niu: CHNENERGY Investment Group Co., Ltd., Zhunneng Group Co., Ordos 017000, China
Zhiming Wang: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Lijie Liu: CHNENERGY Investment Group Co., Ltd., Zhunneng Group Co., Ordos 017000, China
Zexuan Yang: School of Mines, China University of Mining and Technology, Xuzhou 221116, China
Kun Xu: CHNENERGY Investment Group Co., Ltd., Zhunneng Group Co., Ordos 017000, China
Wenqi Lu: CHNENERGY Investment Group Co., Ltd., Zhunneng Group Co., Ordos 017000, China
Lixia Zhu: Xinjiang Institute of Engineering, Support Xinjiang University Western Energy Development Institute, Urumqi 830023, China

Sustainability, 2023, vol. 15, issue 16, 1-21

Abstract: As an important link in open-pit mining production, the crushing station produces a large amount of dust during the production process. Dust has the characteristics of a wide spread area, great harm, and difficult governance. Therefore, dust control has become a key issue that needs to be solved in open-pit mining. In this article, we assess results after high-speed cameras and dust concentration detectors are installed around the crushing station to monitor the dust concentration in the surrounding air. It is found that in the air, dust with a particle size of less than 2.5 μm accounts for 67.43%, less than 10 μm accounts for 17.30%, and less than 100 μm accounts for 15.27%. In settled dust on the ground, particles with a particle size of less than 100 μm account for 42.69% of the sample, and particles less than 10 μm account for 16.60% of the sample. Secondly, physical and chemical properties testing is conducted on the dust. XRD test results show that SiO 2 in the dust accounts for 65.80%; XRF test results show that the oxide Al 2 O 3 in the dust accounts for up to 46.84%; ICP test results show that the element Al accounts for 42.62% of the total amount of trace elements detected; and Si accounts for 35.11%, clarifying the content of harmful substances to the human body. Finally, Fluent software, Ansys 2020 R1, is used to simulate the diffusion law of dust under different states of the crushing station, including an open state, a closed state, and the installation of a dust removal system. Based on the simulation results and the actual situation on site, the optimal dust reduction method suitable for the crushing station is proposed, and the diffusion law of dust under this method is simulated. The tracked dust shows that the dust removal efficiency of PM 2.5 reaches 97.00%, PM 10 reaches 99.60%, and TSP reaches 98.30%.

Keywords: open-pit mines; crushing stations; dust; physical and chemical properties; numerical simulation; dust removal system (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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