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. 2021 May 10;52(1):732–752. doi: 10.1007/s10489-021-02328-z

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© The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature 2021

This article is made available via the PMC Open Access Subset for unrestricted research re-use and secondary analysis in any form or by any means with acknowledgement of the original source. These permissions are granted for the duration of the World Health Organization (WHO) declaration of COVID-19 as a global pandemic.

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Fig. 17 — Comparison of economic benefits. ((1)Comparison of the use of two kinds of reagents in 2018 and 2019:the first and third curves are the frother and collector used in each month of 2018, and the second and fourth curve are the frother and collector used in each month of 2019; (2) Comparison of the incidence of production accidents in 2018 and 2019: the green curve is the incidence of production accidents in each month of 2018, and the yellow curve is the incidence of production accidents in each month of 2019; (3)Comparison of the daily average ash content of clean coal in July 2018 and July 2019: the blue curve is the daily average ash content of clean coal in July 2018, and the purple curve is the daily average ash content of clean coal in July 2019)