Evaluation of the Effects of Coal Jigging by Means of Kruskal–Wallis and Friedman Tests

Tomasz Niedoba (), Agnieszka Surowiak, Ahmad Hassanzadeh and Hamid Khoshdast
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Tomasz Niedoba: Department of Environmental Engineering, Faculty of Civil Engineering and Resources Management, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
Agnieszka Surowiak: Department of Environmental Engineering, Faculty of Civil Engineering and Resources Management, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland
Ahmad Hassanzadeh: Department of Geoscience and Petroleum, Faculty of Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Hamid Khoshdast: Department of Mining Engineering, Higher Education Complex of Zarand, Zarand 77611-56391, Iran

Energies, 2023, vol. 16, issue 4, 1-17

Abstract: Coal beneficiation processes are often based on gravitational enrichment techniques. Therefore, various types of jigs are often used in this area. A number of factors determine the quality of the final product. Therefore, proper and systematic monitoring of such a process is necessary. The present work examined the effect of the hutch water amount and the amount of processed coal (system capacity) on the yield and ash grade in individual density–size fractions. A statistical method in the form of the Kruskal–Wallis test and the Friedman test was used to evaluate the process. These tests were proposed as universal and reliable alternatives to classical analysis of variance (ANOVA) analysis. The performed analysis allowed for the determination of what process conditions should be selected in order to obtain certain effects. Therefore, it allowed us to apply certain combinations of hutch water amount, system capacity and particle characteristics to maximize the expected effects. The application of statistical analysis methods in the form of Kruskal–Wallis and Friedman tests to evaluate process efficiency creates new possibilities to monitor and optimize the jigging process in both context of amount and quality of final product and is very important not only for mining enterprise but also from an environmental point of view.

Keywords: jigging; factor analysis; Kruskal–Wallis test; Friedman test; coal (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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