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Industrial Minerals
Published in Earle A. Ripley, E. Robert Redmann, Adèle A. Crowder, Tara C. Ariano, Catherine A. Corrigan, Robert J. Farmer, L. Moira Jackson, Environmental Effects of Mining, 2018
A. Ripley Earle, Robert E. Redmann, Adèle A. Crowder, Tara C. Ariano, Catherine A. Corrigan, Robert J. Farmer, Earle A. Ripley, E. Robert Redmann, Adèle A. Crowder, Tara C. Ariano, Catherine A. Corrigan, Robert J. Farmer, L. Moira Jackson
Talc, and its massive form steatite, are hydrous magnesium silicates, Mg3Si4O10(OH)2. They are extremely soft, generally white minerals that are chemically inert, hydrophobic, and organophilic. They have high melting points and low thermal and electrical conductivities. Talc’s main use is in the paint, pulp and paper, cosmetics, plastic, and chemical industries. Steatite, also called soap-stone, is used for sculptures. Pyrophyllite, AlSi2O5(OH), is a hydrous aluminum silicate with properties similar to talc; it is used in ceramics, refractories, and insecticides.
Roasting of pyrophyllite for application in aluminoborosilicate glass production
Published in Geosystem Engineering, 2020
Joobeom Seo, Sangbae Kim, In-Kook Bae, Wantae Kim
Pyrophyllite is a naturally occurring hydrous aluminum silicate mineral with the chemical formula of Al2Si4O10(OH)2. It has been used in wide range of applications, such as those in the refractory and ceramic industries due to its intrinsic properties of chemical inertness, high dielectric strength and a high melting point (Erdemoğlu & Sarikaya, 2002; Wang, Hu, He, & Gu, 2004). In the glass industry, feldspar has been used as a source of alumina (Abdel-Khalek, Yehia, & Ibrahim, 1994; Burat, Kangal, & Onal, 2006). The alumina content of the pure feldspar is in the range of 18 ~ 19 % (Abdel-Khalek et al., 1994). Using feldspar in the glass manufacturing process provides an additional benefit: the higher alkali ratio allows feldspar to act as a flux in glass batches (Lee & Kim, 2018). However, the high alkali contents in the glass products can cause problems, especially if the glass is to be used in electronic devices. The alumina content of naturally occurring pyrophyllite is about 19 % and is comparable to that of feldspar (Lee, Kim, Kim, You, & Lee, 2018). In addition, naturally occurring pyrophyllite is characterized by relatively a low alkali contents compared to feldspar, indicating the applicability of pyrophyllite in the glass industry as a raw material.
Cu(II) impregnated clay-derived HS zeolite: Synthesis, characterization and catalytic activity on catalytic wet peroxide oxidation (CWPO) of phenol
Published in Journal of Coordination Chemistry, 2022
Abdelali El Gaidoumi, Karim Tanji, Amal Loqman, Imane El Mrabet, Abdellah Arrahli, Abdelaziz Dra, Youssef Fahoul, Morad Zouheir, Brahim El Bali, Abdelhak Kherbeche
The mineral investigated in this paper (Pyrophyllite) is a local clay (Morocco). Figure 1 depicts the crystal structure of the pyrophyllite, with the dioctahedral 2:1 structure [49]. Pyrophyllite exhibits good physico-chemical properties, such as low thermal expansion, electrical, and thermal conductivity [50]. This mineral has been widely used in many fields, notably in firebrick, ceramics, paper, plastic, and cosmetics. Several previous works investigated the use of pyrophyllite as a natural material for the adsorption of heavy metals [51–53], boron ions [54], and cyanide [55].