Enhanced alumina extraction from kaolin by thermochemical activation using charcoal

Abstract

This is a 'preproof' accepted article for Clay Minerals. This version may be subject to change during the production process.

Synthesized Zeolite Based on Egyptian Boiler Ash Residue and Kaolin for the Effective Removal of Heavy Metal Ions from Industrial Wastewater

“…The chemical stability over a relatively wide range of pH increases the application of kaolinite in paints, ceramics, rubber, and paper industries. In addition, the dispersibility of kaolin particles in water enhances its use as an ideal adjuvant in the pigment industry and in the production of poly-aluminum chloride (PAC), which is used in wastewater treatment [ 24 ].…”

Cost-Effective and Eco-Friendly Extraction of Alumina Based on Kaolin Ore Using Thermo-Chemically Activated Lime-Sinter Process

“…The kaolin and limestone ore samples were crushed, ground, and sieved to < 74 μm. The samples of the limestone-kaolin mixture were prepared according to the stoichiometric molar ratios based on the total oxides content: CaO/SiO2 = 2.0, CaO/Al2O3 = 1.8 and CaO/Fe2O3 = 1.0 according to the optimized condition obtained before in the previous study because this composition the most suitable and high leachable alumina containing phases which in turn gives the maximum alumina percent recovery [17,31,32].…”

“…One of the economic features of the proposed technology is the occurrence of the selfdisintegration process for the sintered mixture at the end of the sintering time. The selfdisintegration process normally takes place as a result of the crystalline β-C2S (2CaO⋅SiO2) formation under high temperatures and then its transformation into the γ phase during the cooling of the sintered mixture according to Equations 4 and 5 [17,31]. Fig.…”

“…Combustion of ≤1.5% charcoal provided additional heat that amorphized the crystalline calcium aluminate into highly leachable amorphous phases with improved self-disintegration efficiency. Charcoal is highly recommended as a cost-effective and energy-efficient activator to enhance the alumina percent recovery from kaolin ore [31].…”

Products of Apatite-Nepheline Ore Processing in the Synthesis of Low-Modulus Zeolites

“…On the other hand, the synthesis of zeolites from inexpensive raw materials is also widely considered to reduce the cost of production (Ruiz et al, 1997;Chen et al, 2022;de Aquino et al, 2020;Gualtieri, 2001;Pacewska et al, 2007). Among nontraditional sources of raw materials, the use of kaolin clay is the most studied (Wang et al, 2020;Foroughi et al, 2021;Alaba et al, 2017;Wang et al, 2013), which, in turn, is a promising source of valuable components (ElDeeb et al, 2021). Zeolites of types A, X, and Y are of the greatest interest.…”