Spatially permeable screening distribution characteristics of banana-type vibrating screen material groups and industrial application

ABSTRACT

Screening is a critical technology to achieve clean and effective use of coal. Due to their ability to achieve equal-thickness screening and excellent working efficiency characteristics, banana screens are widely utilized for material classification. The current work employs a vibration test and analysis system to investigate the laboratory-scale and industrial banana screens’ kinematic features. The screen surface’s amplitude gradients at the inlet and outlet ends of the laboratory and industrial scale banana screens were 0.5 mm and 7.5 mm, respectively, verifying the “strong-in, weak-out” transfer law of the vibration energy. The results of the 6 mm screening experiment in the laboratory indicated that the coal samples were concentrated in the middle of the screen surface with the highest screening efficiency of 95.05% and the lowest total mismatch content of 2.68%. A Birtley’s four-stage banana screen was utilized to classify the 6 mm raw coal during the on-site heavy media separation at the Tunbao coal processing plant. Besides, a better screening performance was obtained with an efficiency of 89.92% and total mismatch content of 5.31%. The differences in accuracy of the distribution rate curves were all less than 5%, indicating that the laboratory banana screen is a prominent guide for industrial applications.

KEYWORDS:

• Banana-type vibrating screen
• distribution characteristic
• coal classification
• spatially permeable screening
• industrial application

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

The research work is financially supported by the Graduate Innovation Program of China University of Mining and Technology(2023WLKXJ066), the Fundamental Research Funds for the Central Universities(2023×SCX021), the National Natural Science Foundation of China (52125403), the Natural Science Foundation of Jiangsu Province (BK20220160), Young Elite Scientists Sponsorship Program by CAST(2021QNRC001), Key Science and Technology Projects in Inner Mongolia Autonomous Region (2021EEDSCXSFQZD007), the Science and technology Project of Xuzhou City (KC21291, KC21091), Research and Application on Optimization of Sorting Process System and Quality Improvement Technology for Tunbao Coal Mine of Xinjiang Company (CEZB220403857), National Key R&D Program for Young Scientists Project (2022YFC2905900).