— The filtrates after separation were analyzed in Figure 6, in which the concentrations of alumina, silica and Na 2 O in the filtrates decreased very rapidly with the addition of concentrated H 2 SO 4, for example, alumina from 19.71 g/kg to 3.19 g/kg, silica from 0.12 g/kg to 0.07 g/kg, and Na 2 O from 17.42 g/kg to 6.10 g/kg.
— 1. Introduction. Numerous scientific publications mention the use of silica or alumina as stationary phase in gas chromatography (Halpaap, 1973, Kiselev, 1970, Mikhail et al., 1979).Silica and alumina offer surface properties covering wide range of acidity, surface reactivity and pore structure (Mikhail et al., 1979, El-fadly et al., 1997, Faramawy …
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— Silica and Alumina Base d Materials Bhanudas Naik and Narendra Nath Ghosh* Chemistry Group, Birl a Institute of Technology and Sci ence - Pilani, Goa Campus, Goa- 403726, India
— In a groundbreaking study led by Omani scientists, the spotlight is on the Sultanate's vast potential to harness high-quality silica sand for cost-effective thermal energy storage. This revelation holds the …
— In this work, an advanced alkali–acid (NaOH–HCl) chemical method featuring submolten salts was used to deash coals with high ash of 27.95%, and …
— In this work, acid leaching behaviors of aluminum, iron, and silica in coal gangue were investigated using hydrochloric acid as leaching agent. Chemical and mineralogical compositions of coal gangue and the leached residue were determined by X-ray diffraction (XRD), X-ray fluorescence, and Fourier transform infrared spectroscopy.
— High-purity quartz (SiO2) is an important material widely used in many industries, including semiconductor technology, telecommunication, and optics. The content and distribution of impurities in quartz significantly affect the processing methods. This paper provides an insightful review on the processing of high-purity quartz, covering the …
— The ferrous fractions can be recovered by a simple magnetic separation method, while alumina and silica can be extracted by chemical or biological approaches. …
— In this work, an advanced alkali–acid (NaOH–HCl) chemical method featuring submolten salts was used to deash coals with high ash of 27.95%, and ultraclean coals were prepared with low ash of 0.62%.
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One of the most important and time-consuming activities in chemistry involves isolating, separating, and purifying chemical compounds. Extraction (literally ... (TLC), a glass plate or plastic support is coated …
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— Alkali leaching was employed to investigate the separation of alumina and silica in roasted kaolin obtained by roasting kaolin alone in air at 1273 K for 60 min and in clinker prepared by roasting the mixed raw meal of kaolin, ferric oxide and coal powder with Fe 2 O 3 /Al 2 O 3 /C molar ratio of 1.2:2.0:1.2 in reducing atmosphere at 1373 K for 60 …
— That is because co-dissolution of silica in the NaAlO 2 solution decreases the final alumina product quality and thus necessitates a desilication stage (Sibanda et al., 2016). For gibbsite ore, both digestion temperature (140–150 °C) and caustic soda concentration (130–170 g/L) are at lower levels compared to other alumina ore types.
— Semantic Scholar extracted view of "Silica-alumina catalytic materials: A critical review" by G. Busca. Semantic Scholar extracted view of "Silica-alumina catalytic materials: A critical review" by G. Busca ... Solid acid catalysts with bi-acidity are promising as workhouse catalysts in biorefining to produce high-quality chemicals and fuels ...
— Kaolin. Kaolin is a fine clay mineral with the chemical composition of Al 2 O 3 ·2SiO 2 ·2H 2 O, composed of two crystal layers: a silicon–oxygen based on SiO 4 tetrahedra and a second layer based on alumina octahedra. Kaolinite is the main ingredient of kaolin of chemical composition Al 2 Si 2 O 5 (OH) 4 (theoretically 39.8% alumina + …
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American Journal of Engineering Research (AJER) 2017 w w w . a j e r . o r g Page 27 Fig. 3: Variation of Bulk densities of Ikere clay containing 10% silica with alumina cement 3.4. Refractoriness The samples were observed to have refractoriness not less than 1400 oC and are within the range of fireclay refractories of 1500 – 1700 oC.The refractoriness of …
sbm physical seperation silica and of uxite oreMining and Refining Process Bauxite & Alumina The Bayer Process is the most economic means of obtaining alumina from bauxite.Baux
— Also, the alumina content to the silica content could apparently be taken as ratio 1:2 of Al 2 O 3 to SiO 2 which agrees with the standard and is in tandem with Sanni [21].
dyes and colouring agents in food. Method 1. Simple chromatography is carried out on paper. 2. A spot of the mixture is placed near the bottom of a piece of chromatography paper and the paper is then placed upright in a suitable solvent, eg water. 3. As the solvent soaks up the paper, it carries the mixtures with it. 4.
— The structural, surface chemical and catalytic properties of the materials belonging to the SiO 2 Al 2 O 3 system are reviewed critically. In particular, amorphous silicas, transitional aluminas, different silica-aluminas (silica-rich and alumina-rich) and protonic zeolites are taken into consideration.
— Magnetic separation technology is a physical separation method that uses the differences in magnetism between matter to separate them from each other by different motion behaviors in a non-uniform magnetic field. It is highly efficient, green, and environmentally friendly, with little change in the physical and chemical properties of raw …
— Silica or alumina. Method: Fill the column with solvent, allowing some to run through the sand and cotton wool to remove air bubbles (Fig. 4, step B). Place a dry funnel in the top and gently pour the silica or alumina (stationary phase) into the solvent. Allow the solvent to drain to prevent overflowing (Fig. 4, step C).
— Fly ash or coal fly ash causes major global pollution in the form of solid waste and is classified as a "hazardous waste", which is a by-product of thermal power plants produced during electricity production. Si, Al, Fe Ca, and Mg alone form more than 85% of the chemical compounds and glasses of most fly ashes. Fly ash has a chemical …
— The adsorption of small particles on the surface of an adsorbent depends on interfacial dynamics and associated parameters, including the adsorbate reactivity, adsorbent surface activity, and ...
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— The formation of a glassy phase caused by the presence of fluxing agents and alkali oxides (CaO, MgO, Na 2 O, K 2 O) ... The chemical resistance to hydrochloric acid (pH 1.5) and NaOH (basic solution, pH 13) was studied. ... Silica sand and recycled alumina prove to be efficient for elaboration of silica–alumina refractory. -
— The current approach to reclaiming inorganic binder waste sand discharged during the aluminum alloy casting process typically involves mechanical grinding combined with calcination treatment (650–700 °C). However, this method encounters challenges such as the accumulation of residual binder on the surface of the reclaimed sand and a …
— In this paper, we verify the separation effect of alumina and silica in CFB-derived coal fly ash by hematite involved roasting-alkaline leaching-Bayer digestion. The …
— Request PDF | Effect of silica/alumina ratio and structure-directing agent on the physical and chemical properties of SAPO-34 | This work describes how the silica/alumina ratio (SAR) affects the ...
