Particle-bubble aggregate stability on static bubble generated by single nozzle on flotation process

Warjito, Harinaldi, Manus Setyantono, Sahala D. Siregar

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

There are three sub-processes on flotation. These processes are intervening liquid film into critical thickness, rupture of liquid film forming three phase contact line, and expansion three phase contact line forming aggregate stability. Aggregate stability factor contribute to determine flotation efficiency. Aggregate stability has some important factors such as reagent and particle geometry. This research focussed on to understand effect of particle geometry to aggregate stability. Experimental setup consists of 9 x 9 x26 cm flotation column made of glass, bubble generator, particle feeding system, and high speed video camera. Bubble generator made from single nozzle with 0.3 mm diameter attached to programmable syringe pump. Particle feeding system made of pipette. Particle used in this research is taken from open pit Grasberg in Timika, Papua. Particle has sub-angular geometry and its size varies from 38 to 300 μm. Bubble-particle interaction are recorded using high speed video camera. Recordings from high speed video camera analyzed using image processing software. Experiment result shows that aggregate particle-bubble and induction time depends on particle size. Small particle (38-106 μm) has long induction time and able to rupture liquid film and also forming three phase contact line. Big particle (150-300 μm) has short induction time, so it unable to attach with bubble easily. This phenomenon is caused by apparent gravity work on particle-bubble interaction. Apparent gravity worked during particle sliding on bubble surface experience increase and reached its maximum magnitude at bubble equator. After particle passed bubble equator, apparent gravity force experience decrease. In conclusion particle size from 38-300 μm can form stable aggregate if particle attached with bubble in certain condition.

Original languageEnglish
Title of host publicationProceedings of the 3rd AUN/SEED-NET Regional Conference on Energy Engineering and the 7th International Conference on Thermofluids, RCEnE/THERMOFLUID 2015
EditorsTetsushi Biwa, Samsul Kamal, Hideaki Ohgaki, Jun Tanimoto, Chaiwat Nuthong, Adhika Widyaparaga, Keiichi N. Ishihara, Harwin Saptoadi, Jayan Sentanuhady, Deendarlianto, Zainal Alimuddin b. Zainal Alauddin, Iman Reksowardojo, Indarto, Yasuyuki Takata, Indro Pranoto
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735413917
DOIs
Publication statusPublished - 3 Jun 2016
Event3rd AUN/SEED-NET Regional Conference on Energy Engineering and the 7th International Conference on Thermofluids, RCEnE/THERMOFLUID 2015 - Yogyakarta, Indonesia
Duration: 19 Nov 201520 Nov 2015

Publication series

NameAIP Conference Proceedings
Volume1737
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference3rd AUN/SEED-NET Regional Conference on Energy Engineering and the 7th International Conference on Thermofluids, RCEnE/THERMOFLUID 2015
Country/TerritoryIndonesia
CityYogyakarta
Period19/11/1520/11/15

Keywords

  • aggregate stability
  • bubble
  • interaction
  • particle size and geometry

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