Role of crystal structure in flotation separation of diaspore from kaolinite, pyrophyllite and illite

Hu, Yuwei; Liu, Xiaowen; Xu, Zhenghe

doi:10.1016/s0892-6875(02)00368-0

Cited by 143 publications

(36 citation statements)

References 10 publications

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“…The results are in good agreement with those reported in the literature [31,40]. The undercoordinated cations and anions in the octahedra and tetrahedra sheets, by the fracture of chemical bonds, are Lewis acid and base sites that are unstable in the presence of water.…”

Section: Zeta Potential Of Pyrophyllitesupporting

confidence: 91%

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Adsorption and kinetic studies of cationic and anionic dyes on pyrophyllite from aqueous solutions

Gücek

Şener

Bilgen

et al. 2005

Journal of Colloid and Interface Science

208

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Section: Zeta Potential Of Pyrophyllitesupporting

confidence: 91%

“…It belongs to the family of silicate minerals that are composed of three infinite layers formed by the sharing of oxygen ions at three corners of the silica tetrahedra. A layer of octahedrally coordinated Al-OH ions holds the two layers of tetrahedrally coordinated Si-O ions together as a three-layer sheet [31].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and kinetic studies of cationic and anionic dyes on pyrophyllite from aqueous solutions

Gücek

Şener

Bilgen

et al. 2005

Journal of Colloid and Interface Science

208

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“…Contact angle measurements have been reported for other mineral clays such as montmorillonite (MMT) [46][47][48], kaolinite [49], and smectite [50] for the purpose of verifying the surface modification of clays. Figure 3 shows profiles of the sessile droplets of ethylene glycol on the surfaces of Pal tablets.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

Effect of Surface Modification of Palygorskite on the Properties of Polypropylene/Polypropylene-g-Maleic Anhydride/Palygorskite Nanocomposites

Cisneros-Rosado

Uribe-Calderón

2017

International Journal of Polymer Science

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The effect of surface modification of palygorskite (Pal) on filler dispersion and on the mechanical and thermal properties of polypropylene (PP)/polypropylene grafted maleic anhydride (PP-g-MAH)/palygorskite (Pal) nanocomposites was evaluated. A natural Pal mineral was purified and individually surface modified with hexadecyl tributyl phosphonium bromide and (3-Aminopropyl)trimethoxysilane; the pristine and modified Pals were melt-compounded with PP to produce nanocomposites using PP-g-MAH as compatibilizer. The grafting of Pal surface was verified by FT-IR and the change in surface hydrophilicity was estimated by the contact angle of sessile drops of ethylene glycol on Pal tablets. The extent of Pal dispersion and the degree of improvement in both the mechanical and thermal properties were related to the surface treatment of Pal. Modified Pals were better dispersed during melt processing and improved Young's modulus and strength; however, maximum deformation tended to decrease. The thermal stability of PP/PP-g-MAH/Pal nanocomposites was considerably improved with the content of modified Pals. The degree of crystallinity increased with Pal content, regardless of the surface modification. Surfactant modified Pal exhibited better results in comparison with silane Pal; it is possible that longer alkyl chains from surfactant molecules promoted interactions with polymer chains, thereby improving nanofiller dispersion and enhancing the properties.

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“…Due to a high degree of isomorphic substitution, this clay carries a large net negative charge (80-100 mequiv/100 g of clay) which is compensated by the presence of counter cations (Swartzen-Allen and Matijevic, 1974). The interlayer spaces are filled with counter cations, the majority of which are potassium ions (Hu et al, 2003). In addition to cations being present in the inter-layer space, they are also present at the clay's surface.…”

Section: Clay Mineralsmentioning

confidence: 99%

Feldspar minerals as efficient deposition ice nuclei

2013

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Abstract. Mineral dusts are well known to be efficient ice nuclei, where the source of this efficiency has typically been attributed to the presence of clay minerals such as illite and kaolinite. However, the ice nucleating abilities of the more minor mineralogical components have not been as extensively examined. As a result, the deposition ice nucleation abilities of 24 atmospherically relevant mineral samples have been studied, using a continuous flow diffusion chamber at −40.0 ± 0.3 • C and particles size-selected at 200 nm. By focussing on using the same experimental procedure for all experiments, a relative ranking of the ice nucleating abilities of the samples was achieved. In addition, the ice nucleation behaviour of the pure minerals is compared to that of complex mixtures, such as Arizona Test Dust (ATD) and Mojave Desert Dust (MDD), and to lead iodide, which has been previously proposed for cloud seeding. Lead iodide was the most efficient ice nucleus (IN), requiring a critical relative humidity with respect to ice (RH i ) of 122.0 ± 2.0 % to activate 0.1 % of the particles. MDD (RH i 126.3 ± 3.4 %) and ATD (RH i 129.5 ± 5.1 %) have lower but comparable activity. From a set of clay minerals (kaolinite, illite, montmorillonite), non-clay minerals (e.g. hematite, magnetite, calcite, cerussite, quartz), and feldspar minerals (orthoclase, plagioclase) present in the atmospheric dusts, it was found that the feldspar minerals (particularly orthoclase) and some clays (particularly kaolinite) were the most efficient ice nuclei. Orthoclase and plagioclase were found to have critical RH i values of 127.1 ± 6.3 % and 136.2 ± 1.3 %, respectively. The presence of feldspars (specifically orthoclase) may play a significant role in the IN behaviour of mineral dusts despite their lower percentage in composition relative to clay minerals.

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Role of crystal structure in flotation separation of diaspore from kaolinite, pyrophyllite and illite

Cited by 143 publications

References 10 publications

Adsorption and kinetic studies of cationic and anionic dyes on pyrophyllite from aqueous solutions

Adsorption and kinetic studies of cationic and anionic dyes on pyrophyllite from aqueous solutions

Effect of Surface Modification of Palygorskite on the Properties of Polypropylene/Polypropylene-g-Maleic Anhydride/Palygorskite Nanocomposites

Feldspar minerals as efficient deposition ice nuclei

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