Microorganisms as chemical reagents: The hematite system

Dubel, J.; Smith, Ross; Misra, M.; Chen, S.

doi:10.1016/0892-6875(92)90233-y

Cited by 47 publications

(20 citation statements)

References 4 publications

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“…Chemical structures of modified sulfonates [46]. phlei cells have been used as flotation collectors for hematite [52,53] and as flotation depressants in the anionic flotation of apatite and dolomite [54]. Zheng et al [55] used Mycobacterium phlei and Bacillus subtilis in order to dolomite depression in anionic flotation.…”

Section: Biofrothersmentioning

confidence: 99%

Flotation Frothers: Review of Their Classifications, Properties and Preparation

Khoshdast¹

2011

TOMPJ

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Abstract:The importance of frothers in flotation is widely acknowledged, particularly in terms of their role with respect to bubble size, and the stability and mobility of the froth phase. These factors play a significant role in the kinetic viability of the process, and the overall recovery and the grade that can be achieved from a flotation cell or circuit. About 60 years ago, Wrobel [1] presented a comprehensive review of flotation frothers, their action, properties and structures. However, during recent six decades flotation reagent technology has undergone considerable evolutions and innovations. The aim of the present review is to provide an updated, comprehensive database comprising recent developments in flotation frother technology as well as some historical aspects. Different types of flotation frothers are discussed regarding to their classifications, properties, and preparation methods. New classification schemes have been suggested in parallel with introducing new characterization criteria. New classes of frothers are actually conventional frothers modified by incorporating certain functional "group" or "atoms" into their molecular structure. Like particle surface modifiers, frothers are also influenced by biotechnology, leading to introducing a new class of frothers named as "biofrothers".

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Section: Biofrothersmentioning

confidence: 99%

Flotation Frothers: Review of Their Classifications, Properties and Preparation

Khoshdast¹

2011

TOMPJ

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“…The mechanism of flocculation has been discussed elsewhere and primarily occurs by cell bridging (7,14). This mechanism is specially efficient in systems where the microorganism is smaller or of in a settling time of 1 min.…”

Section: Resultsmentioning

confidence: 99%

“…An isolate of Arthrobacter has been shown to promote the settling of fines in manganese ore washings (5). The bacterium Mycobacterium phlei (7,14) and the yeast Candida parapsilosis (12,13) improved settling rates in mineral suspensions, but flocculation was not as good as that obtained with commercial long chain flocculants. Most microorganisms adhere to solid surfaces if the charge and hydrophobic interactions between the cells and the solid surface are favorable, but do not always promote flocculation of mineral particles.…”

Section: Introductionmentioning

confidence: 99%

Flocculation of fine fluorite particles with Corynebacterium xerosis

et al. 1999

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The treatment of fine particles dispersed in liquids is common in several industries and especially important in mineral processing. The efficiency of settling operations can be substantially increased by flocculation. The aim of this work was to study the flocculation of fine fluorite particles by the bacterium Corynebacterium xerosis. Flocculation tests, microelectrophoresis measurements and optical microscopy were used to evaluate flocculation. The results showed that C. xerosis cells adhere to the fluorite surfaces promoting the aggregation of the particles. High quality flocs can be obtained rapidly at pH 7.0 using a cell concentration of 40 mg/l, considerably lower than previously reported in the literature. The results are discussed with reference to the surface characteristics of the mineral and of the microorganism.

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“…Mycobacterium phlei has been used to selectively separate coal from pyrite and ash by flocculation and flotation (1)(2). This organism has also been reported to flocculate and float hematite and apatite (3)(4)(5). The effectiveness of Bacillus subtilis as a depressant for dolomite from apatite has been evaluated by Zheng et al (6).…”

Section: Introductionmentioning

confidence: 97%