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This was thought to be the result of the very small (less than 40 μm) bubbles generated by the electroflotation process. A population-balance model, incorporating the hydrogen generation process, supported the conclusion that increased recovery for electroflotation, for very fine silica particles at least, was attributed to the reduced bubble ...
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During the flotation process, hydrophobic minerals are transferred to the foam by bubbles. The size of bubbles has a significant influence on the capture probability of the bubbles and particles, hence affecting the flotation efficiency. Effective regulation of the bubble size is a premise for achieving a controllable flotation index.
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1. Flotation separation of mica minerals and silica sand. Mica dissociates a large number of anions O2- and F- with extremely low zero electric points. After being exposed to the layered structure, they can be recovered …
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The use of sodium silicate accelerated the flotation of phosphate relative to quartz, and also made the froth drier (continuous flotation). Calcium silicate precipitates served as a protective coating on bubbles and stabilized …
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The presence of surfactants and dissolved gas was found to preserve the bubbles generated by cavitation, thus producing more small bubbles. Flotation of fine silica and zinc sulphide precipitates ...
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This information describes that when the bubble size is between 0.97 mm and 1.2 mm presents a linear correlation with the apparent flotation rate constant. In this range of bubble size it can be seen that the kinetics of the flotation process is favoured with the decrease in the bubble diameter.
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silica flotation Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US530370A
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Prior to starting flotation by coarse bubbles, a dosage of microbubbles less than 60 μm in size in the form of a concentrated (66 vol. %) microbubbles dispersion in CTAB solution of (0.2 g L⁻¹ ...
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DLVO calculation for the interaction of a silica particle and an air bubble in 10y4 M univalent electrolyte. The potential of the silica particle was y100 mV, and that of the air bubble, y34 mV at infinite separation. The charge on silica and the …
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bubbles under flotation conditions, resulting in a low collision efficiency of fine particles with flotation bub- bles. Even after contacting with the bubbles, the …
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This is commonly referred to as 'reverse' flotation. Normally silica is floated using an amine as the flotation reagent. But "reverse" ... for flotation to take place, an air bubble must be able to attach itself to a particle, and lift it to the water surface (Fig. 9.1). The process can be applied to relatively fine particles, as if
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Asymmetric force measurements were conducted between a hydrophobized glass sphere and a bare silica plate in dodecylamine hydrochloride (DARCl) solutions as a function of pH in an effort to simulate the forces involved in bubble-particle interactions for the quartz-amine flotation system. The appearance of the hydrophobic force in these ...
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Electroflotation experiments were carried out using 12.6 μm mean diameter silica particles. While fine particles had very poor recovery in the Denver cell, greater than 70% recoveries …
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From the collectors that are used in silica-iron oxides flotation processes come the anionic collectors [4]. These are, for instance, fatty acids, petroleum sulfonates, and alkyl sulfates collectors as derivatives of sulfuric acid in which one hydrogen atom has been replaced by a hydrocarbon radical. ... (2018) Interactional Effects of Bubble ...
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BACKGROUND OF THE INVENTION. This invention is related to reverse flotation processes wherein silica or siliceous gangue is floated. Flotation is a process of treating a mixture of finely divided mineral solids, e.g., a pulverulent ore, suspended in a liquid whereby a portion of the solids is separated from other finely divided mineral solids, e.g., …
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microbubble flotation ( DAF or FAD ) This flotation is normally used in water treatment. In fact, this flotation is well-suited to the treatment of floc that is often fragile and that has a relatively low density because it contains hydroxide …
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Under the best conditions, while the cyclojet cell reduced the iron-oxide content in silica sand from 0.41% to 0.08%, the conventional cell reduced …
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target of the froth flotation process is to upgrade the iron ore contentand minimize the silica content. Keywords: Anionic reverse flotation; Iron ore; Low grade ... can induce bubble clustering in the pulp, that is arrays of bubbles bridged by particles, which can ... & Heiskanen, K., 1990. Batch flotation tests by fatty acid on a phosphate ...
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Schematic illustration of the magnetite-flotation model for Kiruna-type iron oxide-apatite deposits 10. (a) Primary igneous magnetite crystallizes from silicate melt in a magma reservoir and ...
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The granulochemical analysis of the flotation residue showed that 79.0% of iron and 86.0% of aluminum are contained in the fraction below 37 µm. In desliming of the sample in 37 µm, recovery was 75.2% silica and 61.4% mass reduction. In this step, the SiO 2 content increased from 33.4% to 67.0%.
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In this process, the tiny bubbles produced during the dissolved air flotation would contribute to fabricate a hollow structure in the flocs, which was beneficial to the oil removal improvement. On the whole, the COD and oil removal efficiency reached the maximum values of 98.3% and 99.23% when the air-water ratio was 18:1.
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Simulation model and conditions. ANSYS Fluent was used to simulate the process of particle removal by bubble flotation in swirling flow. To simplify the three-phase numerical model and save the computational cost, both particles and bubbles were injected into the fluid by discrete phase model (DPM) in the current work, which is an advanced particle-tracking method.
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Flotation Reagents & Collectors. Froth flotation is the most widely used industrial process for the separation of finely liberated minerals. The process involves the aeration of minerals in water in the presence of flotation reagents which facilitate the attachment of air bubbles to and levitation of select minerals.
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The size of the bubbles fo... It essentially has a mechanism for bubble formation with pulp jet spouting from the apex of hydrocyclone. Enrichment of Silica Sand Ore by Cyclojet Flotation Cell: Separation Science and Technology: Vol 49, No 10
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Electroflotation experiments were carried out using 12.6 μm mean diameter silica particles. While fine particles had very poor recovery in the Denver …
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In research on the particle–bubble collision process, due to the adsorption of surfactants and impurities (such as mineral particles, slime, etc.), most studies consider the bubble surface environment to be immobile. …
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In order to determine the bubble diameter that determines if the fully-loaded bubble rises or sinks in a quiescent aqueous medium, a modified laboratory-scale flotation col-umn was designed and built (Fig. 1) which allows to meas-ure both the diameter and velocity of the bubble completely covered by silica sand of known particle size distribution,
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Abstract In this study the flotation recovery of silica using air, and molecular and electrolytically-generated hydrogen was investigated. For comparison of air and molecular hydrogen recoveries, a laboratory Denver, type D12, flotation machine was used. For both gases, pH of the suspension, gas flow rate, concentration of collector and frother, solids concentration, particle …
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