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Online Estimation of the pH Value for Froth Flotation of ...

Froth flotation of bauxite is a complex nonlinear system with multiple parameters and large time delay. Influence of the recycled water, variation of the ore and other factors make the pH value be unstable. Especially, because the ore resources is becoming exhausted, the ores come from many different deposits. ...

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Flotation of low-grade bauxite using organosilicon ...

Further studies of bauxite ore flotation were also conducted, and the reverse flotation separation process was adopted. The concentrates with the mass ratio of Al2O3 to SiO2 of 9.58 and Al2O3 recovery of 83.34% are obtained from natural bauxite ore with the mass ratio of Al2O3 to SiO2 of 6.1 at pH value of 11 using the organosilicon cationic ...

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New insights into flotation mechanism of diasporic bauxite ...

Froth flotation is an effective way to remove silicon and upgrade quality for diasporic bauxite, but its underlying mechanism on microscopic-scale mineral-bubble interaction was poorly understood.

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Flotation of low-grade bauxite using organosilicon ...

The effect of collector dosage on the flotation of bauxite was studied and the results are shown in Fig. 6. An increase of the collector dosage from 350 to 500 g/t increases the A/S of concentrates from 7.1 to 8.4 and which then never changes with the further increase of collector dosage from 500 to 600 g/t.

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Flotation enhancement of low-grade bauxite using oxalic ...

Froth flotation is one of the most effective ways to upgrade diasporic bauxite. However, it is very difficult to achieve the flotation separation of finely disseminated diaspore from aluminosilicate minerals (such as kaolinite) and challenging to obtain satisfactory flotation efficiency using conventional chemical reagents.

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Flotation of Low-Grade Bauxite Using Modified Humics as ...

Flotation of low-grade bauxite is an effective way to improve the grade. Flotation experiments were carried out by using modified humics as depressant in this paper. The effects of pulp pH, collector dosage and depressant dosage were examined. Under the optimal flotation conditions with sodium oleate dosage of 2200 g/t, modified humics dosage ...

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Treatment technique for wastewater from bauxite flotation ...

Treatment technique for wastewater from bauxite flotation and an application for its reuse Author: Tengfa Long, Xi Liu, Chenbing Ai, Chenquan Wang, Qiang Huo Source: Journal of cleaner production 2022 v.335 pp. 130321 ISSN: 0959-6526 Subject: Exiguobacterium, Gemmobacter, Labrenzia, Stappia, aluminum oxide, bauxite, coagulation, hydrolysis, pH ...

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The flotation of marginal gibbsitic bauxite ores from ...

Current plant recoveries in the processing of the higher grade bauxite ore have been on the average of 25% when treated by grinding and desliming but these high grade reserves are being depleted. The utilization of marginal quality bauxite ores has been considered and flotation technology for treating BNCs and BNs were studied.

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

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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THE FLOTATION OF MARGINAL GIBBSITIC BAUXITE ORES …

ABSTRACT 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 [Fe 2O 3], Goethite [FeO(OH)]), silicates (quartz [SiO 2]), kaolinite [Al 2Si 2O 5(OH) 4] and others such as rutile/anatase [TiO 2].

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THE FLOTATION OF A GIBBSITIC BAUXITE ORE FROM …

Of all the bauxite-processing strategies, flotation is the most attractive and many researchers have been engaged in the study of bauxite flotation. Flotation of bauxite can be done in a specific medium to separate the aluminum minerals from the silicates.

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CN100354045C - Bauxite crude-fine grading flotation ...

The present invention relates to a bauxite crude-fine grading flotation desilicification method. In the present invention, ground raw ore slurry is graded into a coarse sand part and a fine sand part according to certain granularity; fine clay is treated by direct flotation technology, and the coarse sand is treated by reverse flotation technology; consequently, the optimization of the ...

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Flotation enhancement of low-grade bauxite using oxalic ...

Surface pretreatment of low-grade bauxite using oxalic acid was carried out prior to the flotation experiments. 500 g of bauxite samples with a 60% pulp density was firstly ground to 85% < 0.075 mm. After the slurry was transferred to a beaker, a certain amount of oxalic acid solution was added to keep its concentration of 0.01, 0.05, 0.5 mol/L.

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Characterization and flotation of low-grade boehmitic ...

Bauxite is the main raw material in primary aluminum production and its reactive silica content and mass ratio of Al 2 O 3 to SiO 2 (A/S) has a critical role in the economic viability of Bayer process. As a major source of the reactive silica, clay impurities should be removed from the ore as much as possible by a beneficiation method such as froth flotation before the …

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Bauxite Beneficiation & Flotation | Silica & Iron ...

Because the desired product is a high purity Al2O3, the remaining oxides in the bauxite (Fe2O3, SiO2, TiO2, Organic material) are separated from the Al2O3 and rejected as alumina refinery resides (ARR) or red mud. In general, the lower quality the bauxite (ie lower Al2O3 content) the more red mud is generated per ton of alumina product.

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A novel collector RL for flotation of bauxite | SpringerLink

10%The flotation properties of single minerals such as diaspore, kaolinite and pyrophllite in bauxites were investigated using RL as collector. The effects of regulators and unavoidable ions on flotation were studied. Based on the results of single minerals flotation, the separation experiments of mixed minerals and bauxite ore were carried out. The results of …

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THE FLOTATION OF MARGINAL GIBBSITIC BAUXITE ORES …

Flotation can be applied in bauxite ores either by removing the impurities (reverse flotation) or by floating the valuable minerals (direct flotation). Extensive research has been done in China to upgrade the diasporic bauxite ore, generally lower grade, through flotation.

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CN100354045C - Bauxite crude-fine grading flotation ...

but, in the existing bauxite floating method, the bauxite forward flotation technology exist carry secretly in concentrate froth pulp sedimentation thickening filtration difficulty, the concentrate...

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Separation of silica from bauxite via froth flotation ...

Bauxite flotation practice Worldwide, the industrial practice for bauxite consists in feeding the ROM ore directly to the alumina production plant. Shaffer (1985), in his contribution to SME Mineral Processing Handbook chapter on alumina, literally writes that "the intrincate milling and mineral dressing techniques common in the base metal ...

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THE FLOTATION OF A GIBBSITIC BAUXITE ORE FROM …

1.1. Flotation of Bauxite Ores in Industry The first flotation plant for bauxite processing was installed in Zhongzhou, Henan Province, China. The ore contains 65% diaspore as the primary bauxite mineral with kaolinite, illite and pyrophillite as the gangue silicate minerals. A grinding circuit with cyclones reduces the ore size and eliminates

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Enhanced Bauxite Recovery Using a Flotation Column Packed ...

Based on the bauxite flotation tests performed in this study, silicon content of the concentrate decreased from 10.95% to 6.01%, corresponding to improvements in Al/Si ratio from 5.16 to 9.72. 5. Conclusions. In this study, a novel medium was designed and packed in the collection zone of a flotation column. Combining findings from the flotation ...

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