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The contents of hematite Issue 4 Effect of Basicity and Alumina-Silica Ratio on Formation of Silico-Ferrite of Calcium and Aluminum -3. ‘r( Y I z ;SFCA . - A 1.6 2.0 2.4 2.8 3.2 Basicity Fig. 3 Effect of basicity on mineralogical components of sintering sample and porosities did not take on any obvious variations initially, but ...
1. Introduction. The history of catalysts based on mixed oxides of silicon and aluminum is strictly bound to the history of hydrocarbon chemistry and, in particular, of the Catalytic Cracking refinery process [1].This process was first developed by the french Eugene Houdry in the twenties of the 20th century, and then realized at the industrial …
The adsorptive capacity of activated alumina, silica sand and anthracite coal for phosphorus was 3333μg/g, 49μg/g and 100μg/g respectively. Activated alumina displayed adsorp-tive function well ...
The adsorption isotherms of DNA on silica, alumina, and HAP were fitted to Langmuir model better than Freundlich model and Dubinin–Radushkevich model. Higher correlation coefficients were obtained with pseudo-second-order model than the pseudo-first-order reaction model in adsorption kinetics of DNA. The DNA adsorption to the external …
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The preparation of precursor sol is the first and crucial step in fabricating oxide fibers by the sol–gel method. In this study, different aluminum-silica sols were prepared by adjusting the alumina and silica source mixing procedure using aluminum carboxylate sol and tetraethoxysilane (TEOS) as the aluminum source and silicon …
The mine production of silica sand in Mexico amounted to 4.03 million metric tons in 2023, an increase of approximately 52 percent in comparison to 2021.
The same preparation method was extended to form silica–alumina [92] and silica–titania [93] composite membranes using TEOS with aluminum-tri-sec-butoxide (ATSB) or titanium isopropoxide (TIP) respectively (experimental apparatus shown in Fig. 15). The objective was to improve in the presence of vapor at high temperatures, and …
Two refractory (REFO and CONC) characterized by different silica/alumina ratios, were studied. The CONC contains a larger amount of residual glassy phase than …
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 …
The most typical composition of early silica-alumina catalysts for fluid catalytic cracking (FCC) is with a SiO 2 /Al 2 O 3 molar ratio 10–12 corresponding to a …
An eco-concrete prepared by silica-alumina based cementitious material was developed and defined as silica-alumina based concrete. Systematic properties investigation showed that the silica-alumina based concrete exhibited good mechanical properties, low shrinkage strain and superior durability including strong resistances to …
Texas-New Mexico Deposit The bulk composition of the boiler deposit is given in Table 3. The deposit has high concentrations of calcium and sulfur which are probably the resuIt of limestone or dolomitic limestone used as a sulfur sorbent. The deposit also contains about 20 wt% silica, 12 wt% alumina, almost 7 wt% iron and 1.3 wt% titanium.
Tests of apparent porosity, bulk density, linear shrinkage, thermal shock resistance, compressive strength and refractoriness were carried out on the fired samples. The …
Red mud (RM) is a solid waste discharged in the production of alumina from bauxite ores [].In general, about 0.8–1.5 tons of RM is generated from each tons of alumina production by Bayer process, and 1.5–2.5 tons of RM is discharged from the sintering or combined process. [] By 2018, the amount of cumulative RM had reached 4 billion tons …
within the natural silica sand at a temperature of, at least, 895 °C [27]. CaCO 3 was detected in the as prepared silica sand. The processed silica sand, based on Rietveld refinement on XRD data, contained quartz-SiO 2 and calcite-CaCO 3 with weight fractions of 97.8(18)% and 2.2(2)%, respectively (the
This paper describes a novel process, hematite involved roasting − alkaline leaching − Bayer digestion, to extract silica and alumina from high-alumina coal gangue (HACG). The phase transformations during roasting were investigated through X-ray diffraction, X-ray photoelectron spectroscopy, scanning electronic microscope, and …
This work describes how the silica/alumina ratio (SAR) affects the framework, texture, chemical composition, and acidity of SAPO-34 molecular sieves synthesized via hydrothermal crystallization using morpholine (MOR) or triethylamine (TEA) as structure-directing agents (SDA's). The solids were characterized by X-ray diffraction …
The M20 concrete grade was preferred (1:1.5:3). This mixture contained ordinary Portland cement (OPC 32.5), fine aggregate sand, and coarse aggregate gravel stone (one cubic meter of gravel size is less than 20 mm), with the required quantity of water as the prime material [1, 28].The alumina (50 μm) was chosen as a secondary …
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).
Aluminosilicate refractories are manufactured using refractory clays, sillimanite minerals, bauxite, and mixtures of alumina and silica sand. They will refer, somewhat arbitrarily, to common crystalline compounds with melting temperatures of at least 1500 °C [2].The major categories of traditional refractories are fire clays, high …
The adsorption of water, pyridine, CO and CO 2 on a commercial γ-Al 2 O 3 and a commercial amorphous silica alumina (ASA) cracking catalyst are reinvestigated by means of FTIR spectroscopy. It is concluded that the real active hydroxyl groups on γ-Al 2 O 3 are those absorbing at 3790, 3770 and 3730 cm −1 and that they are significantly …
Fig. 4 Scanning electron micrograph of mixture containing pure alumina and Moroccan silica sand. Specimen was sintered at 1600 °C. Display full size. The sintering of these aluminosilicate raw materials (clay, andalusite, silica sand, etc.) leads to the synthesis of Mullite (3Al 2 O 3 ·2SiO 2). The mullite is the only stable intermediate ...
Silica (SiO2) and alumina (Al2O3) nanophases control several important global element cycles. They play a crucial role in rock weathering and thus affect and …
alumina and aluminosilicates that display negligible ion migration effects and possess a high chemical stability, thermal conductivity and radiation resistance.
Natural Silica Sand/Alumina Ceramic Composites: Promising Candidates for Fuel-Cell Sealants. May 2017; IOP Conference Series Materials Science and Engineering 202(1):012060;
A highly efficient and low-cost alumina–silica nano-sorbent was fabricated and characterized to understand the key factors responsible for its superiority over the existing adsorbents in treating the industry-discharged wastewater for the removal of dyes and heavy metals. As compared to the properties of raw fly as
Processing of mullite and alumina based refractory ceramic by unidirectional dry pressing, from two mixtures that include silica sand, pure alumina (PA) and recycled …
a high-alumina sintering mixture SiM-A (4.92 wt% Al 2 O 3) representing the sintering of aluminous ores in India, and. iii) a high-silica sintering mixture SiM-S (9.31 wt% SiO 2) representing the sintering of siliceous ores in Central and Eastern Europe.
Since both alumina and silica in CFA dissolved under alkaline hydrothermal conditions, it was unfavorable to the high-value utilization of aluminum. Furthermore, leached silica and alumina will form hydrated sodium aluminosilicate with alkali (Na 8 Al 6 Si 6 O 24 (OH) 2 2 H 2 O), resulting in a low Al 2 O 3 leaching rate (Li et al., 2014 ...