Separation of silica from bauxite via froth flotation ...

2009-3-1  Bittencourt, 1989, Bittencourt et al., 1990, aiming to obtain a gibbsite concentrate that could be used as raw material for the production of alumina refractories, tried direct flotation of the bauxite minerals from a Brazilian ore sample, composed basically of gibbsite (50%), kaolinite (15%) and quartz (35%). This flotation was carried out in two steps: the first step was the flotation of gibbsite/kaolinite from quartz

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Separation of silica from bauxite via froth flotation ...

Abstract. This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. Tailings from an industrial plant have undergone attrition scrubbing and desliming; the quartz silica contained in the tailings has undergone flotation.

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Separation of silica from bauxite via froth flotation

This paper reports an innovative development: concentrating gibbsite via reverse froth flotation in order to obtain a metallurgical-grade bauxite concentrate. Tailings from an industrial plant have...

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Characterization and flotation of low-grade boehmitic ...

2021-1-15  In this study, low-grade bauxite ore from Seydişehir (Konya, Turkey) containing 57.33% Al 2 O 3 and 9.01% SiO 2, (A/S = 6.36) was investigated to determine the modal mineralogy and mineral liberation with regard to the removal of reactive silica by flotation. Mineralogical studies showed that the principal bauxite mineral was boehmite interlocked with clay minerals (kaolinite and illite), ferruginous

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Implementation of reverse flotation method to reduce ...

2017-1-20  This paper reports a study that implements reverse flotation method to separate silica from West Kalimantan bauxite ores. The study is aimed to find the good process condition to obtain low-silica ...

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Kaolinite removal from bauxite by flotation - SciELO

The preparation of bauxite caused an increase in the alumina/silica mass ratio from 7.30 to 11.05. Subsequently, laboratory scale flotation tests were conducted to verify the reproducibility of the results indicated in the microflotation stage. Laboratory scale flotation tests were done in a Denver machine using a 900 mL cell.

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Flotation separation of diaspore from aluminosilicates ...

2017-11-10  On the contrary, the reverse flotation of diasporic bauxite shows low flotation efficiency of fine silicate particles and poor adaptability to low grade diasporic bauxite due to the small amount of quartz but large amount of different types of silicates in diasporic bauxite, so the reverse flotation and selective flocculation technologies are still at the stage of laboratory or industrial trials (Xu et al., 2004;

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The flotation of marginal gibbsitic bauxite ores from ...

On the other hand, direct flotation of gibbsite from the bauxite ore was accomplished with desliming at pH 10.5 using an alkyl hydroxamate-fatty acid as collector, sodium carbonate as dispersant, and sodium silicate as depressant.

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Significance of particle aggregation in the reverse ...

2015-7-1  Both direct flotation and reverse flotation processes have been developed for bauxite flotation (Marino, 2012). For direct flotation of low grade bauxite ore, gibbsite or diaspore can be floated with hydroxamate collector at high pH (pH 9–10), in the meantime, the silicate minerals (such as kaolinite) are depressed by sodium silicate and iron oxide minerals are depressed by starch.

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(PDF) Reduction of Reactive Silica from Bauxite ...

The conventional process of bauxite ore dressing consists on the removal of natural mud through the steps of crushing, semi-autogenous grinding, crumble in trommel, followed by the removal of the fine fraction (-37 µm) by screening or classification in hydrocyclone and thickening [1, 2], though this process does not remove all the reactive silica.

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THE FLOTATION OF MARGINAL GIBBSITIC BAUXITE

2020-1-19  the predominant silica gangue mineral. Bench flotation tests using customized collectors were evaluated directly for the ground material and after desliming. Both direct and ... 4.12 Effect of desliming on grade for direct flotation with BN bauxite ore, 80% passing

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The Influence of Backwater Al3+ on Diaspore Bauxite

2017-10-15  Bauxite Flotation Chaojun Fang 1, Ziyong Chang 2, Qiming Feng 1, Wei Xiao 1 ID, Shichao Yu 1, Guanzhou Qiu 1 ... It was reported that, until 2015, the bauxite ore reserves in China was 4.71 billion tons [1], and the majority was diaspore bauxite. Diaspore bauxite is unsuitable for direct extraction of alumina ... silica ratios (A/S) of diaspore ...

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Flotation of a low-grade bauxite ore using an ...

2015-11-1  Finally, a reverse flotation separation process was used to process a low-grade bauxite ore. It was concluded that use of the organosilicon cationic collector is effective. A concentrate with aluminum oxide (Al2O3) to silicon dioxide (SiO2) mass ratio, or A/S, of 9.67 was obtained from natural bauxite ore with A/S of 6.07 at pH of around 11.

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Implementation of reverse flotation method to reduce ...

2017-1-20  The study is aimed to find the good process condition to obtain low-silica ... Implementation of reverse flotation method to reduce reactive and non-reactive silica in bauxite ore from West Kalimantan: AIP Conference Proceedings: Vol 1805, No 1

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The flotation of marginal gibbsitic bauxite ores from ...

Bauxite ore is the primary mineral resource for the production of aluminum metal and includes gibbsite [Al(OH)3], diaspore [α-AlO(OH)] and boehmite [γ-AlO(OH)]. Gangue minerals generally include iron oxides (Hematite [Fe2O3], Goethite [FeO(OH)]), silicates (quartz [SiO2]), kaolinite [Al2Si2O5(OH)4] and others such as rutile/anatase [TiO2]. Samples from the Paragominas deposit, Brazil, were ...

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(PDF) Reduction of Reactive Silica from Bauxite

World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.

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Kaolinite removal from bauxite by flotation

Subsequently, laboratory scale flotation tests were conducted to verify the reproducibility of the results indicated in the microflotation stage. Laboratory scale flotation tests were done in a Denver machine using a 900 mL cell. Each test was fed with 200 g of bauxite ore

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EP0950020A1 - Removal of silica from bauxite - Google

A process for removing silica from bauxite is disclosed. The method includes the step of mixing bauxite with a caustic liquor to form a mixture and to dissolve and stabilise at least a substantial part of the reactive silica from the bauxite. The caustic liquor is selected to have a high caustic concentration and a high alumina content.

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GEOPOLYMERIZATION OF LOW-GRADE BAUXITE

2015-2-10  aluminium extraction from bauxite ore greatly depends on the content of reactive silica. With respect to alumina and silica contents, bauxite ores can be of high (metal-lurgical) or low (non-metallurgical) grade. The Bayer process only utilizes the high-grade (metallurgical) bauxite with high alumina and low reactive-silica con-tents. On the ...

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The processing of high silica bauxites ― Review of ...

Abstract World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing. As the economic reserves of high grade ores diminish, attention is turning to how these lower grade ores may be processed at reasonable cost.

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THE PRACTICE OF BAUXITE ORES PROCESSING

2015-8-12  Bauxite beneficialion is seldom done outside Brazil. ln industrial scale, the ROM ore is fed directly to the alumina production plant. ln Brazil, lhere is lradition and culture in doing it. MRN lreals bauxite through scrubbing and ... Reverse froth flotation of the silica present in the fine fraction of gnaissic ores, followed by magnetic ...

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Kaolinite removal from bauxite by flotation

Subsequently, laboratory scale flotation tests were conducted to verify the reproducibility of the results indicated in the microflotation stage. Laboratory scale flotation tests were done in a Denver machine using a 900 mL cell. Each test was fed with 200 g of bauxite ore

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GEOPOLYMERIZATION OF LOW-GRADE BAUXITE

2015-2-10  aluminium extraction from bauxite ore greatly depends on the content of reactive silica. With respect to alumina and silica contents, bauxite ores can be of high (metal-lurgical) or low (non-metallurgical) grade. The Bayer process only utilizes the high-grade (metallurgical) bauxite with high alumina and low reactive-silica con-tents. On the ...

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(PDF) Reduction of Reactive Silica from Bauxite

World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.

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The Influence of Backwater Al3+ on Diaspore Bauxite

2017-10-15  Bauxite Flotation Chaojun Fang 1, Ziyong Chang 2, Qiming Feng 1, Wei Xiao 1 ID, Shichao Yu 1, Guanzhou Qiu 1 ... It was reported that, until 2015, the bauxite ore reserves in China was 4.71 billion tons [1], and the majority was diaspore bauxite. Diaspore bauxite is unsuitable for direct extraction of alumina ... silica ratios (A/S) of diaspore ...

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Flotation of a low-grade bauxite ore using an ...

2015-11-1  Finally, a reverse flotation separation process was used to process a low-grade bauxite ore. It was concluded that use of the organosilicon cationic collector is effective. A concentrate with aluminum oxide (Al2O3) to silicon dioxide (SiO2) mass ratio, or A/S, of 9.67 was obtained from natural bauxite ore with A/S of 6.07 at pH of around 11.

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EP0950020A1 - Removal of silica from bauxite - Google

A process for removing silica from bauxite is disclosed. The method includes the step of mixing bauxite with a caustic liquor to form a mixture and to dissolve and stabilise at least a substantial part of the reactive silica from the bauxite. The caustic liquor is selected to have a high caustic concentration and a high alumina content.

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Washing of Bauxite to Remove High Silica Content

2016-5-23  In view of beneficiation action of bauxite, removal of maximum silica content from the feed ore is removal of silica content that are active in nature before entering into digestion is the concept.

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reverse cationic flotation of silica and silicates

Flotation Of Silica From Bauxite Ore. Reverse flotation silica is floated Reverse Cationic Flotation Of Silica And Silicates from bauxite ore using Gemini cationic low alumina and silica from...

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A Novel Technology Study of Separation Silicon from a

This paper reports an innovative development: the separation of silicon from bauxite with two stages by the stage grinding and stage flotation via the direct flotation, and obtained the high quality bauxite concentrate, the flotation index is favorable. The raw ore contains Al2O3 60.78%, SiO2 20.84%, the Al2O3 to SiO2 mass ratio (A/S) is 2.92 ...

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