Polysaccharide Depressants for the Reverse Flotation of Iron Ore

Shrimali, Kaustubh; Miller, Jan D.

doi:10.1007/s12666-015-0708-4

Cited by 37 publications

(11 citation statements)

References 28 publications

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“…The significance of the results is important in the understanding of existing flotation processes and in the design of new flotation separations [18]. In addition to the significance of these findings in the field of flotation chemistry, the results being reported are important to the pigment industry, since dispersion of hematite pigments will be influenced significantly by the wetting characteristics of hematite.…”

Section: Introductionmentioning

confidence: 93%

The surface state of hematite and its wetting characteristics

Shrimali

Jin

Hassas

et al. 2016

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 93%

The surface state of hematite and its wetting characteristics

Shrimali

Jin

Hassas

et al. 2016

Journal of Colloid and Interface Science

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“…However, considering that the particles were subjected to thorough washing with water before analysis, the interaction could be physical and probably due to hydrogen bonding. Shrimali and Miller 22 , in their concise review of the interaction of polysaccharides and iron ores, outline that polysaccharide adsorption may be due to hydrogen bonding, hydrophobic interaction, or chemical complexing (acid–base reaction). The hydrophobic interaction might play a major role in reducing the surface charge, allowing for flocculation/aggregation of the particles; thus, leading to magnetite depression.…”

Section: Resultsmentioning

confidence: 99%

Beneficial effects of a polysaccharide-based grinding aid on magnetite flotation: a green approach

Chipakwe

Karlkvist

Rosenkranz

et al. 2022

Sci Rep

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Grinding is the most energy-intensive step in mineral beneficiation processes. The use of grinding aids (GAs) could be an innovative solution to reduce the high energy consumption associated with size reduction. Surprisingly, little is known about the effects of GAs on downstream mineral beneficiation processes, such as flotation separation. The use of ecofriendly GAs such as polysaccharide-based materials would help multiply the reduction of environmental issues in mineral processing plants. As a practical approach, this work explored the effects of a novel polysaccharide-based grinding aid (PGA) on magnetite's grinding and its reverse flotation. Batch grinding tests indicated that PGA improved grinding performance by reducing energy consumption, narrowing particle size distribution of products, and increasing their surface area compared to grinding without PGA. Flotation tests on pure samples illustrated that PGA has beneficial effects on magnetite depression (with negligible effect on quartz floatability) through reverse flotation separation. Flotation of the artificial mixture ground sample in the presence of PGA confirmed the benefits, giving a maximum Fe recovery and grade of 84.4 and 62.5%, respectively. In the absence of starch (depressant), PGA resulted in a separation efficiency of 56.1% compared to 43.7% without PGA. The PGA adsorption mechanism was mainly via physical interaction based on UV–vis spectra, zeta potential tests, Fourier transform infrared spectroscopy (FT-IR), and stability analyses. In general, the feasibility of using PGA, a natural green polymer, was beneficial for both grinding and reverse flotation separation performance.

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“…The found results suggest that starch adsorption occurs onto the surface of both minerals. However, at the tested pH range, the interaction between quartz and amine is stronger, making it difficult (maybe even preventing) the starch adsorption onto this mineral surface (Shrimali and Miller, 2016). According to Lima et al (2013), high amine dosages lead to the formation of clathrates, a compound in which molecules of one species occupy the empty spaces in the lattice of the other species, therefore resulting in the depression of hydrophobic minerals.…”

Section: Quartz Microflotation Resultsmentioning

confidence: 99%

Hematite and quartz microflotation using millet starch as depressant

Silva¹,

Sousa

Silva³

2021

REM, Int. Eng. J.

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Brazil is among the world's largest iron ore producers. The standard concentration method is reverse cationic flotation using amines, and their derivatives, such as quartz collector and corn (as either grits, flour, or starch) as the hematite depressant. Corn is considered cheap, abundant, and available all around the country. However, its demand has been abruptly increasing over the last few years, mainly due to the emerging of new attractive markets, such as ethanol production. In order to propose a feasible replacement for corn, hematite and quartz samples from the Brazilian Iron Quadrangle were tested in a modified Hallimond tube using millet starch as depressant for the first time (corn and sorghum starch were used as benchmark). Tests were carried out with four different depressant dosages and four different pHs, all in triplicate. It was possible to reach quartz floatability above 98% and hematite depressability above 93% for millet and sorghum starches. This fundamental study shows that replacing corn with millet poses a real opportunity to reduce operational costs.

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Polysaccharide Depressants for the Reverse Flotation of Iron Ore

Cited by 37 publications

References 28 publications

The surface state of hematite and its wetting characteristics

The surface state of hematite and its wetting characteristics

Beneficial effects of a polysaccharide-based grinding aid on magnetite flotation: a green approach

Hematite and quartz microflotation using millet starch as depressant

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