...Danyal Karbalaei Saleh; Hadi Abdollahi; Mohammad Noaparast; Alireza Fallah Nosratabad Abstract This study examines the leaching of aluminium from calcined kaolin (metakaolin) with citric, oxalic and lactic acid and binary combinations of these organic acids. The investigated parameters were...

...Ali Boukhemkhem; Kamel Rida; Alejandro H. Pizarro; Carmen B. Molina; Juan J. Rodriguez ABSTRACT An iron catalyst supported on the modified Tamazert kaolin has been prepared and tested in catalytic wet peroxide oxidation using phenol and 4-chlorophenol (4-CP) as target compounds (100 mg/L initial...

...Emmanuel Ajenifuja; Abimbola P.I. Popoola; Kabir O. Oyedotun; Olawale Popoola ABSTRACT Kaolin and diatomite are abundant and widely available geological materials that may immobilize or stabilize functional chemical species on their surfaces for various applications. Acid-treated kaolin...

...Gürsel Yanık; Rasim Ceylantekin; Eda Taşçı ABSTRACT The Gümüşköy kaolin clay deposit, located ~40 km northwest of Kütahya, Turkey, has promising reserves for ceramic production. In order to evaluate the potential use of this region, five representative clay samples were collected and characterized...

...Angel Sanz; Joaquín Bastida; Angel Caballero; Marek Kojdecki ABSTRACT Compositional and microstructural analysis of mullites in porcelain whitewares obtained by the firing of two blends of identical triaxial composition using a kaolin B consisting of ‘higher-crystallinity’ kaolinite or a finer...

...H. Chargui; W. Hajjaji; J. Wouters; J. Yans; F. Jamoussi ABSTRACT The present study investigated the adsorption behaviour of Direct Orange 34, a highly toxic dye used in textile industries in Tunisia, on modified kaolinite-rich clays. A kaolin from the Sidi Bader (SDB) area was activated...

...Daniela Novembre; Domingo Gimeno; Nicola d’Alessandro; Lucia Tonucci ABSTRACT The present work deals with the synthesis of kalsilite using material from a kaolinitic rock outcrop in Romana, Sassary Province, Sardinia, Italy. The hydrothermal synthesis method required the dissolution of kaolin...

... ; Kremenovic et al., 2013 ). KAlSiO 4 polymorphs were synthesized using kaolin; the effects of time and temperature on the synthesis process were investigated. A solid-state synthesis protocol was developed which required the mixing of the calcined kaolin with K 2 CO 3 in stoichiometric proportions...

... hydrated. Most antibacterial clays are from hydrothermally altered volcanics, where volcanogenic fluids produce minerals containing reduced metals. Ferruginous illite-smectite (I-S) is the most common clay mineral, although kaolins dominate some samples. Antibacterial clay mineral assemblages may contain...

...Paula E.A. Lima; Rômulo S. Angélica; Roberto F. Neves Abstract The kinetics of dissolution of Amazonian metakaolin in hydrochloric acid (HCl) was studied using the ‘Shrinking Core Model’ for spherical and ‘flat plate’ particles of constant size. The Amazonian kaolin was calcined at 700°C for 2 h...

...R.A. Menezes; S.P.A. Paz; R.S. Angélica; R.F. Neves; R. Neumann; F.R.L. Faulstich; S.B.C. Pergher Abstract Ultramarine pigments were synthesized successfully from Na-A zeolite derived from kaolin waste. Na-A zeolite encapsulates the sulfur species formed and which act as chromophores, which...

...Feridun Demir Abstract —The influence of anionic dispersing agents, such as sodium poly(acrylic acid), sodium hexametaphosphate, and sodium silicate on the dissolution of crude kaolin was examined by measuring the dissolved metals produced in the absence and presence of dispersing agents...

...Bernard A. Goodman; NiRamon Worasith; wen Deng Abstract The EPR spectrum of a previously unreported paramagnetic centre formed in kaolin minerals by exposure to γ radiation is described. This centre, which is referred to here as the ‘C-centre’, was seen initially during an investigation...

...Bernard A. Goodman; NiRamon Worasith Abstract Aung et al. (2014, 2015) described the activation of kaolin samples to remove coloured pigments from rice-bran oil, the effects of various treatments on their decolourization capacity, and the characterization of these kaolin samples by physical methods...

...Francisco-José Rubio-Hernández; Nicolás-Marcelo Páez-Flor; Ana-Isabel Gómez-Merino; Francisco-José Sánchez-Luque; Reinaldo Delgado-García; Leonardo Goyos-Pérez Abstract Previous studies of dispersant–aqueous kaolin dispersions have indicated clearly that the concentration of the dispersant...

..., Mexico, and the United States. In order minimize the need for these costly imports, the present study sought to evaluate the viability of producing low-silica zeolites through the hydrothermal synthesis of a Colombian kaolin, which contains quartz (40%) and iron-oxide impurities. The kaolin was subjected...

...Ana Áurea B. Maia; Roberto F. Neves; Rômulo S. Angélica; Herbert Pöllmann Abstract Kaolin wastes from the Capim and Jari regions (Brazil) were used to produce sodalite under the same conditions used in the Bayer process, in order to control its formation when necessary. Of the two kaolin source...

...Maryam Tavasoli; Hossein Kazemian; Sodeh Sadjadi; Morteza Tamizifar Abstract The benefits of using kaolin as a source of aluminosilicate in zeolite synthesis to obtain lower-cost catalysts, adsorbents, or ion exchangers are widely known. Previous attempts to produce zeolite from natural Iranian...

...R. Z. Al Bakain; Y. S. Al-Degs; A. A. Issa; S. Abdul Jawad; K. A. Abu Safieh; M. A. Al-Ghouti Abstract A kaolin clay was activated with 1.0 m H 2 SO 4 solution at minimum liquid to solid ratio (L/S) using microwave heating. The optimum experimental conditions for activation were L/S ratio 3.0 mL 1...

...Y. Li; H. Jiang; W. Zhang; L. Xu Abstract In the present study, changes of iron content, brightness, particle size, mineralogy and paramagnetic properties of kaolins before and after superconducting high gradient magnetic separation (SHGMS) were investigated. The Fe 2 O 3 contents of the feed...