Effect of the ultrasonic standing wave frequency on the attractive mineralization for fine coal particle flotation
2021 (English)In: Ultrasonics sonochemistry, ISSN 1350-4177, E-ISSN 1873-2828, Vol. 77, article id 105682Article in journal (Refereed) Published
Abstract [en]
Froth flotation for mineral beneficiation is one of the most important separation techniques; however, it has several challenges for processing fine and ultrafine particles. Attractive mineralization between particles and bubbles by ultrasonic standing wave (USW) is a novel and high-efficiency method that could assist fine particle flotation. Frequency is an important ultrasound parameter, whose effectiveness mechanisms on the attractive mineralization did not compressively address. This study explored the effect of the USW field with various frequencies on the fine coal flotation for filling this gap. Herein, a high-speed camera and a focused beam reflectance measurement (FBRM) were used to analyze three sub-processes of the attractive mineralization, including the microbubbles’ formation, the conventional flotation bubbles (CFBs)’ dispersion, and the particles’ movement. It was found that the maximum flotation metallurgical responses were obtained under the highest examined USW frequency (600 kHz). However, the flotation outcomes by a low USW frequency (50 kHz) were even lower than the conventional flotation tests. Observation and theoretical calculation results revealed these results were originated from the influence of frequency on the carrier bubbles’ formation and the action of the secondary acoustic force during USW-assisted flotation. These outcomes demonstrated that frequency is a key factor determining the success of attractive mineralization for fine particles’ flotation.
Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 77, article id 105682
Keywords [en]
Ultrasonic standing wave, Fine coal, Frequency, Attractive mineralization, Flotation
National Category
Physical Chemistry Mineral and Mine Engineering
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-86489DOI: 10.1016/j.ultsonch.2021.105682ISI: 000685652600007PubMedID: 34330084Scopus ID: 2-s2.0-85111195311OAI: oai:DiVA.org:ltu-86489DiVA, id: diva2:1582192
Note
Validerad;2021;Nivå 2;2021-07-29 (beamah);
Forskningsfinansiärer: China Postdoctoral Science Foundation (No. 2019M652024), National Nature Science Foundation of China (Grant No. 52074288).
2021-07-292021-07-292023-09-05Bibliographically approved