Feasibility Study of the Use of Nepheline-Limestone Charges Instead of Bauxite

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

“…Also, the possibility of using any grade of kaolin ore with the aim of the extraction of alumina using this method is also possible. These results fully agreed with the previously obtained data on the possibility of efficient processing of aluminosilicates with the extraction of Al2O3 at the level of 84-85%, even when using low-grade raw materials (nepheline syenite) with an Al2O3 content of 29-30% to 17.5%, but at the same time, the decisive influence of silicate modulus on the extraction of Al2O3 [8]. Hence, the recommended flowsheet for processing kaolin ore using a thermo-chemically activated lime-sinter process is presented in Fig.…”

Difficulties in the industrial introduction of new effective hydrodesulfurization catalysts in the Russian Federation

“…In earlier works, dozens of commercialAl2O3support grades were tested:Ketjen SK-300 with SBET = 192 m 2 /g [10], Girdler T-126 with SBET = 188 m 2 /g [11], γ-Al2O3 Degussa with SBET = 105 m 2 /g [12], JCR-AlO-7 with SBET = 180 m 2 g, γ-Al2O3Axens withSBET from 90 to 300 m 2 /g [13,14]. Along with those, laboratory auxiliary support samples based on different types of aluminum hydroxides [15] and various molding methods (extrusion and dropping) with the addition of various components (SiO2, TiO2, CeO2, ZrO2) [16]were obtained. The range of structural properties was the following: SBET from 100 to 640 m 2 /g, and total pore volume from 0.16 to 2.71 cm 3 /g [17,18,19,20,21,22].…”

Enhanced alumina extraction from kaolin by thermochemical activation using charcoal

“…A high-grade white kaolin raw material collected from the Irkutsk mining site (Ivanov et al, 2019) and a white limestone with some faint reddish tints obtained from the Pikalevo region, Russia (Sizyakov et al, 2016) were used in the present study. The chemical and mineralogical compositions and the thermal characteristics of the raw kaolin and limestone samples were studied in detail in our previous works (ElDeeb et al, 2019(ElDeeb et al, , 2020a.…”