Abstract
Ultrasonic waves have a lot of use in the particle surface cleaning. As flotation is one of the methods associated with surface properties, this paper investigates the effect of these waves on performance, particle size, reagents, and feed ash content in coal flotation. To accomplish this goal, coal samples in three size fractions, including coarse (− 800 to + 400 µm), medium (− 400 to + 100 µm) and fine (− 100 µm) with various feed ash content. The flotation experiments were evaluated by process indexes such as yield, combustible recovery, and selectivity index. The results indicated the increasing of yield. The increasing was significant in medium size. Furthermore, the results showed that in presence of ultrasonic waves, the collector and frother consumption decreased. And also, applying ultrasonic waves would result more combustible recovery and selectivity index. The ash selectivity index had the highest impact for high feed ash content.
Highlights
Coal is an abundant energy source, that the population growth and technology development greatly increases its consumption
As flotation is one of the methods associated with surface properties, this paper investigates the effect of these waves on performance, particle size, reagents, and feed ash content in coal flotation
The impact of ultrasonic waves on surface composition and the flotation performance of high-sulfur coal was investigated and the results showed an increase in coal hydrophobicity and pyrite hydrophilicity; increase in separation efficiency and flotation selectivity; increase in the recovery of coal concentrate; a reduction in product’s sulfur and ash; and an increase in the number of bubbles sticking to particles in ultrasonic preparation (Kang et al 2008)
Summary
Coal is an abundant energy source, that the population growth and technology development greatly increases its consumption. The increasing use of coal and the need to reduce environmental pollutions draws more attention to the coal processing technology (Laskowski 2001). In the existing methods for mineral processing, flotation is considered as a physicochemical method that uses the natural disparities in the properties of the minerals and is widely used to separate valuable minerals from gunges (Yuan et al 1996; Sripriya et al 2003; Wills and Finch 2016). When the size of the coal particles is very small (under 50 lm) or Department of Mining, Petroleum and Geophysics, Shahrood University of Technology, Shahrood, Iran very large (higher than 500 lm), the efficiency of the flotation is greatly reduced. Efforts to increase the recovery of these particles through increasing the oil collector dosages often results significant production of non-combustible materials with the floating coal (Maoming et al 2010)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Coal Science & Technology
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
