alumina silica separation
Comprehensive Extraction of Silica and Alumina from Coal Fly Ash
2023年11月30日 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 result
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Separation of alumina and silica from metakaolinite by reduction ...
2022年3月1日 The efficient separation of silica and alumina in the reduced specimen can be realized by leaching with NaOH solution at ~110 °C. After pre-oxidation roasting, the
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Separation of aluminum and silica from coal gangue by elevated ...
2015年5月1日 High-temperature direct acid leaching is highly effective for separating metal ions and silica in coal gangue. An increase in temperature significantly improves the
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Extraction of alumina and silica from high-silica bauxite by
First, high-silica bauxite is activated by sintering with Na2CO3. Second, water leaching is conducted at atmospheric pressure to extract most of Al2O3 from the sintered sample into the
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Efficient separation of silica and alumina in simulated CFB slag by ...
2019年3月15日 The efficient separation of silica and alumina in reduction roasted product is then achieved by alkaline leaching of the roasted product under atmospheric pressure. The
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Novel process for high value utilization of high-alumina fly ash ...
Metallurgical grade alumina could be produced by soda-lime sintering process, which has the disadvantages of high-energy consumption and large slag discharge. Alumina and silicon
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Beneficiation Strategies for Removal of Silica and
2021年11月24日 The technologies applicable to beneficiating iron ore fines include wet and dry gravity and magnetic separation, flotation, and roasting followed by magnetic separation. A commercial flowsheet is expected to
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High-Selectivity, High-Flux Silica Membranes for Gas
1998年3月13日 Silica membranes calcined at 600°C showed no detectable CH 4 flux, with a H 2 permeance of 5 × 10 −7 (mol m −2 s −1 Pa −1) at 200°C. These results signify an important step toward the industrial application of these
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Efficient separation of alumina and silica in reduction-roasted
2019年2月1日 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.
MoreEfficient separation of alumina and silica in reduction-roasted
2019年2月1日 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.
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Extraction of alumina from aluminum dross by a non-hazardous
2021年7月10日 However, it is hard to avoid the continuous dissolution of silica in subsequent leaching process, causing alumina-silica separation problem (Guang-hui et al., 2010). Further, the problems of waste discharge (exhaust gas and solid waste) cannot be treated well and most studies investigated the alumina extraction rate only.
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Silica-alumina zeolite adsorbents for oxygen generation via
2024年2月1日 Considering that silica-alumina zeolite is predominantly adopted as an adsorbent for equilibrium separation in the field of O 2 generation from air separation, the following review will focus on clarifying the requirements for silica-alumina zeolite to be a good adsorbent for O 2 production.
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Stepwise extraction and utilization of silica and alumina from coal
2024年2月1日 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).
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Efficient separation and comprehensive extraction of aluminum,
2023年6月20日 Efficient separation and comprehensive extraction of aluminum, silicon, and iron from coal fly ash by a cascade extraction method. ... CFA is rich in various valuable elements, and silica (SiO 2) and alumina (Al 2 O 3) are the first two abundant compositions (Fan et
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Engineering silica membranes for separation performance,
2023年1月1日 Membrane technology has emerged as a leading separation process because of its high energy efficiency, easiness in scale-up and operation, and absence of chemical wastes [1, 2].For example, membranes have been practiced to desalinate salty water, remove CO 2 from natural gas (CO 2 /CH 4 separation), produce N 2 from the air (O 2 /N 2 separation), and
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Efficient separation of silica and alumina in simulated CFB slag by ...
2019年3月15日 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 ...
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Separation of alumina and silica from metakaolinite by reduction ...
silica in CFB slag is removed by alkaline leaching, the alumina in the leaching residue can be extracted by the Bayer process. Unfortunately, the traditional roasting−leaching process cannot realize the efficient separation of silica and alumina from kaolinite because of the formation of
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Extraction of Silica and Alumina from Lunar Highland Simulant
2024年10月10日 We present the result of a workbench experiment designed to extract silica (SiO 2) and alumina (Al 2 O 3) from the anorthosite (CaAl 2 Si 2 O 8) contained in lunar regolith.Hydrochloric acid was used as a leaching reagent as it fits within a conceptual circular industrial basis for in situ lunar resource extraction and manufacturing.
MoreSilica-alumina zeolite adsorbents for oxygen generation via
2024年2月1日 Considering that silica-alumina zeolite is predominantly adopted as an adsorbent for equilibrium separation in the field of O 2 generation from air separation, the following review will focus on clarifying the requirements for silica-alumina zeolite to be a good adsorbent for O 2 production.
MoreEfficient separation of silica and alumina in simulated CFB slag by ...
2019年3月15日 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 ...
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Preparation of microporous silica membranes for gas separation
Microporous silica membranes for hydrogen separation were prepared on a γ-alumina coated α-alumina tube by sol-gel method. The reactants of sol-gel chemistry were tetraethoxysilane (TEOS) and methacryloxypropyl-trimethoxysilane (MOTMS). The silane coupling agent, MOTMS, was added as a template in order to control the pore structure to the silicon alkoxide, TEOS. In
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Synthesis and separation properties of an α-alumina
2013年11月15日 A thin high-silica MEL membrane was synthesized on a porous α-alumina hollow fiber support by a secondary growth approach.The membrane quality was evaluated by permporometry, single-gas permeation and butane isomer separation.
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Preliminary results on selective surface magnetization and separation ...
2015年10月1日 The efficient and economical separation of alumina/silica minerals is critical to alumina production. In this work, selective surface magnetization was adopted to separate alumina-/silica-bearing minerals. The zeta potentials of boehmite, quartz, and magnetite with and without 100 ppm sodium fluoride (NaF) were measured.
MoreUS3006723A - Process for the separation of aluminum from silicon
the silicate content of the bauxite is most important, for any reactive silica combines with alumina during the digestion with caustic soda and is carried into the red mud as an insoluble sodium aluminum silicate. About 1 pound of alumina and 1 pound of soda are lost for each pound of silicate in the bauxite and these losses have prevented the use of alumina ores containing
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Preparation of alumina/silica core-shell abrasives and their CMP ...
2007年8月31日 Preparation of α-alumina/silica core-shell particles—a certain amount of 0.2 ... (DI) water and following centrifugal separation for five times. By adopting different weight percent of Na 2 SiO 3 versus α-alumina, composite particles with SiO 2 coating content of 2, 5, ...
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Alumina for Column Chromatography - acme synthetic chemicals
Silica Gel and Alumina are both polar adsorbents but Silica Gel is less polar than Alumina. Carbon-carbon double bonds contribute somewhat more to compound adsorption on alumina as compared to silica gel, ... 5.5 and is useful for separation of acid pigments, strong acids, phenols, sulfonic, ...
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Solutions for Light Hydrocarbons and Gases: PLOT Columns Phil
Alumina Silica Carbon Porous polymers Porous polymers Silica Porous polymers Select Perm. Gases Select Low Sulfur Porous polymers Silica Lowox OxyPLOT 18 July 31, 2014 . ... • Poor C4 isomer separation Alumina preferred • Not sensitive to moisture • Good choice for solvents and CFCs 19 July 31, 2014 .
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Mineral phase transformation in coal gangue by high temperature ...
2021年9月1日 However, the separation efficiency of alumina and silica is not satisfactory. This is also the reason for the low utilization rate of coal gangue. At present, scholars have carried out related researches on the separation of silica and alumina components in coal gangue, which can be divided into two methods: acid separation and caustic separation.
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