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The flotation experiment results of natural iron ore showed that flotation indexes with 59.73% Fe, iron recovery of 81.5% and 75.68% of dephosphorization ratio were achieved at a soluble starch ...
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Previous references showed that the reverse flotation of quartz from hematite can be achieved using corn starch as the depressant and DDA as the collector [10, 11]. However, in most cases, hematite ores also contain a little amount of calcite (CaCO 3 ), and the calcite slimed easily during the grinding process because it has low …
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excess so that it begins to act as a frother, surface tension measurements were assessed. The other reagent conditions such as pH and depressant (soluble corn starch) were monitored and held constant. 2.4. Methods Bench Flotation experiments in duplicate were performed in a 3 L Barker flotation machine. Agitation time with starch …
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The use of small quantities of polyacrylic acid (PAA) was found to significantly improve the flotation of fine-sized hematite particles at pH 4.1 and 0.001 M NaCl with sodium dodecylsulfonate (SDS). Low polymer dosages before collector addition aid flotation by forming flocs of primary particles, but excess polymer results in low flotation yields due …
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Effects of starch preparation conditions on the flotation of hematite (flotation condition: 4 × 10 − 4 M DAC, 1.5 mg/L starch, flotation medium pH 8.5). Fig. 8 shows the recovery of quartz as a function of the starch solution preparation conditions for the four starches in the presence of 1 × 10 − 4 M DAC.
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The attachment of micro-fine siderite to the hematite surface was therefore diminished. Pregelatinized starch was then added and formed a dense starch layer, which prevented the adsorption of sodium oleate. Thus, the flotation of hematite was depressed. Download : Download high-res image (918KB) Download : Download full-size image; Fig. 8.
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The function of corn starch and the significance of the order of addition of corn starch and mono ether amine in the reverse flotation of iron ore has been investigated. Understanding hematite depression with starch and the corresponding hydrophilic state involves consideration of adsorption with amine as well as flocculation …
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Reverse flotation of silica from hematite is by far the most common strategy for the processing of iron ore containing silica gangue. In reverse flotation, quartz, the major …
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In this paper, a detailed study of the influence of Mn2+ ions on quartz and hematite flotation (at pH 10.5 with starch/amine as depressor/collector) in the absence and presence of ...
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Reverse flotation of quartz from hematite is used extensively in the processing of iron ore containing quartz as the gangue mineral. It has been observed that depression of quartz takes place when excessive starch is used in the reverse flotation of iron ore, thus reducing the grade of the hematite concentrate. In the present work, the …
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Pearl starch markedly improved the iron recovery of the flotation process, when used in quantities up to 1 lb per short ton, by selectively depressing the hematite. …
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Adsorption of starch on hematite shows significant changes of C 1s and O 1s peak components compared to hematite stirred in water at pH 10.5. ... Adsorption of starch, amylose, amylopectin and glucose monomer and their effect on the flotation of hematite and quartz. Miner. Eng., 16 (2003), pp. 1117-1122. View PDF View article View …
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The optimum flotation pH for hematite and quartz was firstly determined. Flotation tests for hematite and quartz were carried out at a dodecylamine dosage of 30 mg/L without the addition of starch. Fig. 5 shows that the flotation recoveries of both minerals first increased and then decreased over pH. The maximum recoveries of …
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During the reverse flotation of quartz from hematite, cationic reagent dodecylamine (DDA) is generally used as a collector for quartz flotation while native starch is widely applied as a ...
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It was found that after ultrasonic treatment, starch was not only able to impart a higher surface wettability of hematite, but also better reduced the degree of entrainment of fine …
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The most widely used and most effective flotation scheme for hematite in China is found to be the reverse anionic flotation of quartz in which starch is added as depressant for hematite, Ca 2+ as ...
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In order to prevent hematite from being floated together with quartz, corn starch is used in reverse anionic flotation of hematite to hinder the adsorption of fatty acid collector at the hematite ...
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Considering that an excess of ether diamine in solution was able to ... L. Ultrasonic treatment improves the performance of starch as depressant for hematite flotation. Ultrason. Sonochem. 82 ...
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Captive bubble contact angle and micro-flotation experiments indicated that amine has an affinity towards both hematite and quartz, and that the role of starch …
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Hematite could be depressed easily by starch. However, the energy between siderite and starch was −1759.29 kJ·mol −1 and it approximately equaled to that of hematite, which indicated that starch preferred to adsorb on siderite surface, as well. So starch consumption would increase if there was siderite in reverse flotation of hematite.
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Fig. 6a-Fig. 6b shows FTIR spectra of the hematite surface and the hematite surface treated with starch, respectively. The peak at 3404 cm −1 in the spectrum "a" comes from hydroxide group vibrations of the hematite surface that has been transferred to peak in the 3461 cm −1 in the spectrum "b".
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Thus, statistical evaluation and optimization of reverse nanobubble hematite flotation was conducted after demonstrating the beneficial effects of nanobubbles on reverse anionic flotation of hematite at different starch dosages from 0.25 kg/t to 2 kg/t in presence and absence of nanobubbles as shown in Fig. 4. It is worthwhile to point out …
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DOI: 10.1016/j.jcis.2018.04.002 Corpus ID: 4861784; The nature of hematite depression with corn starch in the reverse flotation of iron ore. @article{Shrimali2018TheNO, title={The nature of hematite depression with corn starch in the reverse flotation of iron ore.}, author={Kaustubh Shrimali and Venkata Atluri and Yan Wang and Sanket …
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Depressed silicate gangue flotation caused by an excessive dosage of starch has been reported by Pavlovic and Brandao and by Kar, et al. . In addition, it was suggested that starch as a flocculant could result in the entrapment of gangue particles in the hematite flocs,, diluting the iron ore concentrate grade. Hence, it is importance to ...
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The flotation experiments demonstrated that in a flotation system using starch as an inhibitor and DDA as a collector, employing CPAM as a flocculant effectively hydrophobizes and flocculates microfine-grained chlorite, thus enhancing the flotation efficiency and achieving efficient separation between microfine-grained chlorite and hematite.
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In this study, ultrasonic treatment was introduced to enhance the depressive performance of starch in the reverse flotation separation of fine hematite from quartz. It was found that after ultrasonic treatment, starch was not only able to impart a higher surface wettability of hematite, but also better reduced the degree of entrainment of fine ...
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For a small starch concentration, ΔH on hematite reaches a maximum of 314 J/g starch adsorbed, and then falls off at higher concentration, probably due to partial deanchorage and reorientation of ...
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1. Introduction. In Brazil, reverse cationic flotation has been the most commonly used route for the concentration of itabirite [[1], [2], [3]].In the process, quartz is recovered in the flotation froth in the presence of etheramine (R O (CH 2) 3 NH 2), and the iron mineral content is usually depressed by corn starch, a mixture composed of …
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The optimum flotation pH for hematite and quartz was firstly determined. Flotation tests for hematite and quartz were carried out at a dodecylamine dosage of 30 mg/L without the addition of starch. Fig. 5 shows that the flotation recoveries of both …
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Request PDF | Molecular arrangement of starch, Ca 2+ and oleate ions in the siderite-hematite-quartz flotation system | Based on the negative effects caused by siderite in the reverse flotation of ...
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