Molecular arrangement of starch, Ca2+ and oleate ions in the siderite-hematite-quartz flotation system

Hao, Haiqing; Li, Lixia; Yuan, Zhulin; Liu, Jiongtian

doi:10.1016/j.molliq.2018.01.117

Cited by 50 publications

(17 citation statements)

References 37 publications

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“…The flotation process of quartz ore is similar to the reverse flotation of iron ore by depressing iron and floating silica. NaOL is commonly used as a collector of magnesite in the separation flotation of Mg and Ca, Si of magnesite ore, and the collector of quartz in the separation flotation of Fe and Si of iron ores or silica ores (Hao et al, 2018;Sun et al, 2020). CaCl2 is usually used as an activator for the separation flotation of iron and silica (Liu et al, 2013;Hao et al, 2018).…”

Section: Flotation Experimentsmentioning

confidence: 99%

“…NaOL is commonly used as a collector of magnesite in the separation flotation of Mg and Ca, Si of magnesite ore, and the collector of quartz in the separation flotation of Fe and Si of iron ores or silica ores (Hao et al, 2018;Sun et al, 2020). CaCl2 is usually used as an activator for the separation flotation of iron and silica (Liu et al, 2013;Hao et al, 2018). Causticized starch is commonly used as an inhibitor for iron minerals in the separation flotation of iron and silica (Hao et al, 2018).…”

Section: Flotation Experimentsmentioning

confidence: 99%

“…CaCl2 is usually used as an activator for the separation flotation of iron and silica (Liu et al, 2013;Hao et al, 2018). Causticized starch is commonly used as an inhibitor for iron minerals in the separation flotation of iron and silica (Hao et al, 2018). The impurities in the quartz ore cannot be effectively removed by using many kinds of starch and many steps.…”

Section: Flotation Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching

Zhu¹,

Dai²,

Li³

et al. 2020

Physicochem. Probl. Miner. Process.

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The purity of a quartz ore is relatively low at a SiO2 content of 97.18%, and the main impurity in the ore is Fe, Al, and Ca bearing minerals. The main component in an industrial waste bacteria (WJ) is polysaccharides, which may be used as depressors for inhibiting iron minerals in quartz flotation. Moreover, WJ belongs to microbial inhibitors because it is mainly composed of bacteria. As a result of this study, a concentrate grade of 99.88% at recovery over 80% was obtained under the condition of 2000 g/Mg WJ dosage, a grinding fineness of 70%-0.074 mm, pH 11.7, 400 g/Mg CaCl2, and 800 g/Mg NaOL in the flotation experiments for the quartz ore. Moreover, a SiO2 grade of 99.97% at a recovery of 68.85% was obtained at an acid dosage of 40 kg/Mg by using mixed acid of H2SO4, HCl, HNO3, and HF in mass ratios of 20%, 30%, 20%, and 30%, respectively, in subsequent acid leaching of the quartz flotation concentrate. Zeta potential analysis before and after the interaction of quartz and hematite with WJ showed that WJ increased the zeta potential of hematite significantly but had little impact on the zeta potential of quartz, indicating stronger adsorption of WJ on hematite than on quartz. FTIR analysis showed that there exist not only-COOH,-CH2-, and-CH3, which are the functional groups of starch but also NH2 and-C=O-NH-in WJ. The NH2 and-C=O-NH-in WJ are the important groups for adsorption, so the depressing effect on hematite was better for WJ than starch.

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Section: Flotation Experimentsmentioning

confidence: 99%

Section: Flotation Experimentsmentioning

confidence: 99%

Section: Flotation Experimentsmentioning

confidence: 99%

See 1 more Smart Citation

An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching

Zhu¹,

Dai²,

Li³

et al. 2020

Physicochem. Probl. Miner. Process.

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“…Quartz is one of the main gangue minerals in iron ores [1], and it is also the common gangue mineral for most metal oxidized ores, non-metal oxidized ores, sulfide ores, silicate minerals, phosphate minerals [2,3]. There are many varieties of quartz in nature, such as α-quartz, β-quartz, coesite, and stishovite, among which α-quartz is the most widely distributed, and is the main rock-forming minerals of magmatic, sedimentary, and metamorphic rocks [4].…”

Section: Introductionmentioning

confidence: 99%

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Zhang

Hu$^{

et al. 2019

Minerals

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A scientific and rigorous study on the adsorption behavior and molecular mechanism of collector sodium oleate (NaOL) on a Ca2+-activated hydroxylated α-quartz surface was performed through experiments and density functional theory (DFT) simulations. The rarely reported hydroxylation behaviors of water molecules on the α-quartz (101) surface were first innovatively and systematically studied by DFT calculations. Both experimental and computational results consistently demonstrated that the adsorbed calcium species onto the hydroxylated structure can significantly enhance the adsorption of oleate ions, resulting in a higher quartz recovery. The calculated adsorption energies confirmed that the adsorbed hydrated Ca2+ in the form of Ca(H2O)3(OH)+ can greatly promote the adsorption of OL− on hydroxylated quartz (101). In addition, Mulliken population analysis together with electron density difference analysis intuitively illustrated the process of electron transfer and the Ca-bridge phenomenon between the hydroxylated surface and OL− ions. This work may offer new insights into the interaction mechanisms existing among oxidized minerals, aqueous medium, and flotation reagents.

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“…The unselective attachment of fine siderite on hematite and quartz deteriorated the flotation of both siderite and hematite seriously. 13 To improve the separation of the ore, pregelatinized starch (PS) was added to enhance the selective flocculation and flotation of fine siderite, thus eliminating the detrimental effects of fine siderite on reverse flotation of hematite. The aggregation behavior of siderite with hematite and quartz affected by PS was analyzed by extended Derjaguin−Landau−Verwey−Overbeek (EDLVO) theory.…”

Section: ■ Introductionmentioning

confidence: 99%

Adsorption of Pregelatinized Starch for Selective Flocculation and Flotation of Fine Siderite

Hao

Somasundaran

et al. 2019

Langmuir

Self Cite

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Pregelatinized starch (PS) was used for the selective flocculation and flotation of fine siderite in a carbonate-containing iron ore. With PS, the flotation of fine siderite was improved. The repulsive forces between fine siderite particles and the attractive forces between siderite and hematite or quartz were decreased after treatment with PS, indicating that the aggregation of siderite was enhanced and the aggregations of mixed minerals were weakened. An analysis of the changes in X-ray photoelectron spectra showed that coordination bonds were formed when PS was adsorbed on siderite and hematite. However, PS could not adsorb on quartz. Moreover, the molecular simulation showed that the main mechanism for PS adsorption on siderite was confirmed as a “tail model” with end −OH coordinated with Fe2+. The bridge connection of PS enhanced the flocculation of fine siderite. The flotation of fine siderite was also enhanced. For hematite treated with PS, the combination of coordination bond and hydrogen bond resulted in the “loop model” and “train model” as the main adsorption mechanisms of PS. The molecules covered the hematite surface and prevented the adsorption of the collector. The flotation of hematite was depressed. As a result, the selective flocculation and flotation of fine siderite were realized.

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Molecular arrangement of starch, Ca2+ and oleate ions in the siderite-hematite-quartz flotation system

Cited by 50 publications

References 37 publications

An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching

An experimental study of removing impurity from a quartz ore by microbial flotation-acid leaching

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Adsorption of Pregelatinized Starch for Selective Flocculation and Flotation of Fine Siderite

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