Results 231 to 240 of about 669,997 (282)

Flotation characteristics and flotation kinetics of fine wolframite

Powder Technology, 2017
Abstract The flotation characteristics and kinetics of fine wolframite from Shizhuyuan Mine, Hunan, China were studied. Coarse and middle particles entered the concentrate easily. However, because of the reduction of middle particles as carriers and the poor collision and attachment between fine particles and air bubbles, it was difficult to float ...
Guanghua Ai, Xiuli Yang, Xiaobo Li
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On the kinetics of froth flotation

International Journal of Mineral Processing, 1990
Abstract The problem of froth flotation kinetics is treated as a transport phenomenon. Two coupled equations of balance are formulated which concern the particles attached upon the bubbles and the free particles in the pulp. The combined equations are solved and an analytical expression for the recovery as a function of time is obtained.
B.P. Radoev, L.B. Alexandrova, S.D. Tchaljovska   +2 more
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Wetting film stability and flotation kinetics

Advances in Colloid and Interface Science, 2002
Single bubble experiments performed with different size fractions of quartz particles and different, but known, contact angles revealed two modes of flotation dynamics in superclean water. (1.) A monotonic increase of collection efficiency Ecoll with increasing particle size was observed at high particle hydrophobicity and, correspondingly, a low ...
J, Ralston, S S, Dukhin, N A, Mishchuk
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Kinetics and mechanism of coal flotation

Colloid & Polymer Science, 2002
The flotation kinetics of coarse coal particles was studied in a modified version of the Hallimond tube at 25 °C using nitrogen as the carrier gas, in the pH range 2–12. The kinetics was followed by measuring the volume of the particles accumulated in the collector tube as a function of time.
Eduardo Humeres, N.A. Debacher
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Flotation Kinetics and Fine Particle Flotation

2004
As with all physical and chemical processes flotation is a rate process governed by kinetic parameters, which are determined by several factors including the chemistry of the mineral-water interface, particle-bubble collision efficiency, and the strength of attachment of particles to the bubbles.
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Application of flotation kinetics models to chalcopyrite flotation: determination of optimum flotation times

Journal of Dispersion Science and Technology
This study advances the field of flotation kinetics by deriving and comparing optimum flotation time equations for eight different kinetic models in chalcopyrite beneficiation. While Agar (1985) established the method for finding the optimum flotation time for his specific model, this research extends the application to multiple established flotation ...
Selma Şimşek, Turan Kilinç, Yakup Cebeci, Ahmed Abbaker   +3 more
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Experimental Studies on the Kinetics of Flotation

1992
Dissolved-air flotation (DAF) is a combination of several physical and chemical unit processes and operations. This study is focused on the phenomena in the flotation tank and especially on the formation and rising of air-bubble floc agglomerates (called agglomerates only).
J. Heinänen, P. Jokela, J. Peltokangas
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Bubble spreading kinetics and mineral flotation

Minerals Engineering, 1994
The rate of movement of the three phase contact line when a gas bubble displaces an aqueous solution from silica surfaces of varying hydrophobicity has been examined. Bubbles with radii from 0.4 × 10−3 to 2.6 × 10−3 m have been studied, on surfaces hydrophobized with short chain organosilanes and long chain alcohols.
G. Newcombe, J. Ralston
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Thermodynamic and Kinetic Flotation Criteria

Mineral Processing and Extractive Metallurgy Review, 1989
Abstract Flotation thermodynamics and notation kinetics are discussed and compared with chemical thermodynamics and chemical kinetics. While chemical thermodynamics can predict whether a reaction will take place under a given set of conditions (temperature and pressure), and can also predict the direction in which the equilibrium will be shifted in ...
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Effect of temperature on the kinetics of froth flotation

Minerals Engineering, 1994
Abstract The kinetics of froth flotation and the three-phase contact (TPC) parameters are studied at temperatures varying from 20°C to 40°C. The material floated consists of glass spheres (ballotini) and quartz particles with various diameters. Dodecylamine hydrochloride (DDAHCl) as a collector is used.
D. Lazarov, L. Alexandrova, I. Nishkov
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