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Anion-cation separations on a mixed bed alumina-silica ...

Mixed bed ion-exchange (MBIE) columns containing alumina and silica were evaluated for the simultaneous separation of anion and cation analytes. At the mobile phase pH used alumina provides anion exchange sites while silica provides cation exchange sites. Since alumina and silica exhibit weak acid a …

Method for hydrofluoric acid digestion of silica/alumina ...

The process for hydrofluoric acid digestion of silica/alumina matrix material for the production of silicon tetrafluoride and aluminum fluoride and other heavy metals involves the following general equations: I. Separation silica/alumina matrix material as SiF 4 (g) and AlF 3: SiO 2 /Al 2 O 3 +10HF SiF 4 (g) +2AlF 3 (aq) +5H 2 O . II.

Comprehensive Extraction of Silica and Alumina from High ...

Therefore, the separation of alumina and silica in ARPs could be achieved by alkaline leaching. The leaching results of silica in ARPs obtained at 600–1100 °C under the leaching conditions of temperature of 110 °C, duration of 120 min, solid–liquid ratio of 10 g/100 mL, and NaOH concentrate of 160 g/L are shown in Fig. 7. The silica ...

Efficient separation of silica and alumina in simulated ...

The combustion process of coal gangue and the subsequent separation of alumina and silica by alkaline leaching of the simulated CFB slag were investigated. The results show that, in the combustion process, kaolinite in coal gangue firstly converts into meta-kaolinite at 600-900 °C due to dehydroxylation, and then the meta-kaolinite splits into ...

Silica vs. Alumina ... or in other words "Alien vs ...

The neutral type of Alumina allows purifying in a pH neutral environment, useful for acid or also basic sensitive compounds.. Learn more …

Efficient separation of silica and alumina in simulated ...

The separation of alumina and silica in clinker was carried out by alkaline leaching in 160 g/L NaOH solution with solid/liquid of 5 g/50 mL at 110 °C for 180 min. Fig. 8 shows that the silica leaching ratio is about 95% and nearly unchanged when treating the clinker of RCG-800 °C and RCG-900 °C, and the corresponding A/S in the leached ...

Separation characteristics of …

Nanoporous silica membrane without any pinholes and cracks was synthesized by organic templating method. The tetrapropylammoniumbromide (TPABr)-templating silica sols were coated on tubular alumina composite support ( γ-Al 2 O 3 / α-Al 2 O 3 composite) by dip coating and then heat-treated at 550 °C. By using the prepared TPABr templating silica/alumina composite …

Adsorbents - BASF Catalysts

The BASF portfolio includes proprietary alumina, silica, alumino-silica gels and a broad line of base metal oxide guard bed materials, including the PuriStar family. We make adsorbents differently. Adsorption is the accumulation of atoms or molecules on the surface of a material. This process creates a film of the adsorbate (the molecules or ...

Adsorption at Silica, Alumina, and Related Surfaces

for the separation of oxygen and argon, the separation of ... 2 Adsorption at Silica, Alumina, and Related Surfaces. ORDER REPRINT S for 30 min, the pale yellow color of {TiNCFe(CN) 5} 3 ...

Efficient separation of silica and alumina in simulated ...

After magnetic separation, the alumina content, silica content, and the mass ratio of alumina/silica in the non-magnetic part of the separation product was 80.36 wt%, 6.49 wt%, and 12.38 ...

Advances in Methods for Recovery of Ferrous, Alumina, …

ferrous, alumina, and silica. The ferrous fractions can be recovered by a simple magnetic separation method, while alumina and silica can be extracted by chemical or biological approaches. Alumina extraction is possible using both alkali- and acid-based methods, while silica is extracted by strong alkali, such as NaOH.

PETROTAT - Alumina Silica Gel

Sorbead Alumina silica gel adsorbents extend moisture control, product quality and process life cycles. The Sorbead line of highly efficient adsorbent alumina silicate gels is in the form of hard, spherical beads, with a very high resistance to crushing and a low attrition rate.

Minerals | Free Full-Text | Alumina and Silica Extraction ...

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.

Efficient separation of alumina and silica in reduction ...

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 min. The thermodynamic …

Anion-cation separations on a mixed bed alumina-silica ...

Mixed bed ion-exchange (MBIE) columns containing alumina and silica were evaluated for the simultaneous separation of anion and cation analytes. At the mobile phase pH used alumina provides anion exchange sites while silica provides cation exchange sites. Since alumina and silica exhibit weak acid and base properties, their anion and/or cation ...

(PDF) Modeling of Hydrogen Separation using Silica/Alumina

The silica/alumina membrane showed a high hydrogen permeance (∼10−7 mol m−2 s−1 Pa−1) with selectivity over CH4, CO, and CO2 in …

The Comparison of Silica Gel-Alumina Sorbents for ...

The silica: alumina (5:5 g) column is suitable for the separation of PCBs and silica: alumina (5:10 g) is preferred for the separation of PAHs. The efficiency of the developed clean- up method was evaluated using real sediment sample. KEY WORDS: Column chromatography, Sediment, Environmental analysis, PAHs, PCBs, HPLC.

Separation of aluminum and silica from coal gangue by ...

Separation of aluminum and silica from coal gangue by elevated temperature acid leaching for the preparation of alumina and SiC. ... Alumina is widely used as a catalyst and adsorbent. It is also used in the production of metallic aluminum. China, as the largest producer of aluminum, requires a large amount of metallurgical-grade alumina. ...

(PDF) Adsorption at Silica, Alumina, and Related Surfaces

Adsorption at Silica, Alumina, and Related Surfaces. January 2006; Authors: ... for the separation of oxygen and argon, the separation of. normal from branched paraffins, the drying of gases, and.

(PDF) The Comparison of Silica Gel-Alumina Sorbents for ...

The silica: alumina (5:5 g) column is suitable for the separation of PCBs and silica: alumina (5:10 g) is preferred for the separation of PAHs. The efficiency of the developed clean- …

Mineral phase transformation in coal gangue by high ...

Separation of silica and alumina from coal gangue after phase transition. After the coal gangue is calcined and undergoes phase transformation, the released active silica components are easily dissolved in the caustic solution. The optimal conditions for alkali leaching desiliconization of calcined coal gangue are explored in this section.

Separation by Chromatography Methods - Sinica

silica on a plastic or aluminum backing. The silica is very polar the stationary phase. 2. Spot the material at the origin (bottom) of the TLC plate. 3. Place the plate into a glass jar with a small amount of a solvent in the glass jar. the moving phase. 4. Remove the plate from the bottle when the solvent is close to the top of the plate. 5.