Sorghum starch as depressant in mineral flotation: part 1 – extraction and characterization

Silva, Elenice Maria Schons; Peres, Antônio Eduardo Clark; Silva, André Carlos; Leal, Maria Carolina Di Medeiros; Lião, Luciano M.; Almeida, Viviane O.

doi:10.1016/j.jmrt.2018.04.001

Cited by 21 publications

(9 citation statements)

References 28 publications

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“…In addition, blank tests (without depressant) were also carried out at the same four pHs. Flotigam EDA (an ether amine) manufactured by Clariant was used as collector in two different dosages: 20 mg/L for hematite and 5 mg/L for quartz, as proposed by Silva et al (2019b). The authors discovered that the hematite floatability was, as expected, lower than the quartz floatability under the same operational conditions and in the absence of depressant.…”

Section: Mining Mineraçãomentioning

confidence: 85%

“…An incomplete factorial design 4 3 was adopted, with three independent variables (pH, depressant dosages and type) and four levels of each variable, except for the depressant type. Four pHs (9, 9.5, 10, and 10.5) were tested, as proposed in literature in close agreement with the industrial practice for hematite flotation, mineral recovery optimization, and preferred adsorption of the amine onto the quartz surface (Pinto et al, 1992, Santos and Oliveira, 2007, and Silva et al, 2019b.…”

Section: Mining Mineraçãomentioning

confidence: 88%

“…Starches from different botanical sources could be used as depressants as long as they are available in the market with acceptable price and sufficient volume to meet the mining company demands (Peres and Correa, 1996;Turrer and Peres, 2010;and Silva et al, 2019b).…”

Section: Mining Mineraçãomentioning

confidence: 99%

“…Mineral samples from the Brazilian Iron Quadrangle were used in this study. Sample preparation and characterization can be found elsewhere (Silva et al, 2019b). According to the authors, the samples had a purity of around 97% and 95%, for hematite (total Fe around 67.6%) and quartz, respectively.…”

Section: Mining Mineraçãomentioning

confidence: 99%

“…Even more, Ma et al (2011) found good results working with iron ore samples from Brazil with d 80 of 129 μm by reverse anionic flotation. The flotation was carried out for 1 minute after conditioning the starches for 5 minutes and the collector for 1 minute (Silva et al, 2019b;Kar et al, 2013). All the flotation experiments were conducted at room temperature and in triplicate.…”

Section: Mining Mineraçãomentioning

confidence: 99%

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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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Section: Mining Mineraçãomentioning

confidence: 85%

Section: Mining Mineraçãomentioning

confidence: 88%

Section: Mining Mineraçãomentioning

confidence: 99%

Section: Mining Mineraçãomentioning

confidence: 99%

Section: Mining Mineraçãomentioning

confidence: 99%

See 3 more Smart Citations

Hematite and quartz microflotation using millet starch as depressant

Silva¹,

Sousa

Silva³

2021

REM, Int. Eng. J.

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Application Potential and Technological Properties of Colored Sweet Potato Starches

et al. 2020

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The objective of this study is to demonstrate the application potential of starches extracted from four varieties of colored sweet potatoes by determining their technological, thermal, and pasting properties. The purple sweet potato (PSP) starch presents the largest mean diameter (14.2 µm). The white sweet potato (WSP), orange sweet potato (OSP), beige sweet potato (BSP), and PSP starches present an inconspicuous triplet on the nuclear magnetic resonance (NMR). The WSP and OSP starches show CA‐Type and the BSP and PSP starches show A‐Type characteristics on the X‐ray spectrum. The BSP and PSP starches show the presence of peaks in amorphous regions on the Fourier transform infrared (FT‐IR) spectroscopy. The differential scanning colorimetry (DSC) thermogram of the BSP and PSP starches show lower gelatinization energies and wider gelatinization temperature ranges (difference between the conclusion and onset temperatures). The viscoamylographic profiles of the WSP and OSP starches show greater thermal stability. These technological properties demonstrate the potential application of these starches in sauces, snacks, instant soups, dairy desserts, yogurts, and bread.

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Starch Modified by Natural Fermentation in Orange‐Fleshed Sweet Potato

et al. 2021

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This study aims to modify starch via the spontaneous fermentation of orange-fleshed sweet potato for a period of 0, 4, 8, 12, 16, and 20 days and evaluates the effects of this process in this starch. In Brazil, this flour which is naturally fermented from manioc is described as "puba." Thus, the results of "puba" from the orange-fleshed sweet potato ferment for 12 days show increases in the amylose content, luminosity, gelatinization enthalpy from Differential Scanning Calorimeter (DSC), final paste viscosity from Rapid Viscous Analyzer (RVA), and gel hardness but the water solubility and absorption (WSI and WAI) indexes are reduced. Using Scanning Electron Microscopy (SEM), the consumption of non-starchy materials and depressions on the surface of the granules resulting from the fermentation could be seen. The Fourier Transform Infrared (FT-IR) Spectroscopy, X-Ray Diffraction, and Nuclear Magnetic Resonance (NMR) Spectroscopy analyses show that no new functional groups are formed, and there are no changes in the crystallinity pattern (showing the same native C A-pattern) or molecular arrangement, respectively. Therefore, the sweet potato "puba" flour shows production viability due to the advantageous changes in its technological characteristics, as well as the potential to be studied for further food applications.

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Sorghum starch as depressant in mineral flotation: part 1 – extraction and characterization

Cited by 21 publications

References 28 publications

Hematite and quartz microflotation using millet starch as depressant

Hematite and quartz microflotation using millet starch as depressant

Application Potential and Technological Properties of Colored Sweet Potato Starches

Starch Modified by Natural Fermentation in Orange‐Fleshed Sweet Potato

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