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Alumina - an overview | ScienceDirect Topics Alumina is a valuable raw material used in the production of various products such as adsorbents, abrasives, polishing agents, refractory materials, and aluminum It is obtained from bauxites through the Bayer process and requires the removal of certain organic compounds to enhance its production From: Journal of Hazardous Materials, 2020
Chemistry of alumina, reactions in aqueous solution and its application . . . Most solid phases in natural water contain aluminium oxides Alumina plays an important role in regulating the composition of soil–water, sediment–water, and other natural water systems [11] Active alumina, due to its high surface area, mechanical strength and thermal stability has found several applications as an adsorbent and catalyst
Recent processes for the production of alumina nano-particles Alumina nano-particles have wide usage in the adsorption and catalysis fields, because of its acid-base properties, high specific area, mechanical and thermal stability The first part of the review interested on the various processes for the production of nano-particles alumina
High-temperature mechanical properties and thermal . . . - ScienceDirect An alumina-fiber-reinforced alumina ceramic matrix (Al 2 O 3 Al 2 O 3) composite is fabricated by a slurry infiltration process in this study The slurry contains Al 2 O 3 powders with broad particle size distribution (d 10 = 0 35 μm, d 50 = 0 57 μm, d 90 = 1 90 μm)
Organized mesoporous alumina: synthesis, structure and potential in . . . Alumina is a very interesting material with broad applicability as a support for various catalytically active phases, which are employed in industry in a high number of large-scale technological processes [10], [11] Usually, conventional aluminas with surface areas of 50–300 m 2 g are manufactured by precipitation [12]
Alumina Production - an overview | ScienceDirect Topics Alumina is the most widely used of the twenty or so oxide ceramics and is often regarded as the historic forerunner of modern engineering ceramics The actual content of alumina, reported as Al 2 O 3, ranges from 85% to 99 9%, depending upon the demands of the application
Kinetics and properties of porous alumina with a dense surface layer . . . Porous alumina with a dense surface layer was prepared via pressureless sintering of bimodal powders followed by vacuum impregnation using a nano-alumina sol Optimal properties (>25 % porosity, >500 MPa compressive strength) were achieved at 1200 °C using 6 wt% 600 nm alumina mixed with 200 nm powder
Alumina fibers: composites and applications - ScienceDirect Alumina, also known as aluminum oxide, is a white powder that is highly resistant to chemical corrosion This refractory oxide has a melting point of 2024°C, making it a popular choice for high-temperature applications Alumina fiber is created by spinning a solution that contains an aluminum compound and an organic polymer
Toward sustainable green alumina production: A critical review on . . . Alumina in sorted tailings was recovered by acid or alkali leaching During reduction roasting, sodium salts (sodium sulfate or sodium carbonate) were usually added to react with Al 2 O 3 and SiO 2 in bauxite to accelerate the destruction of the bauxite structure and promote the reduction of iron oxides and the growth of iron grains [88] , [89]