Bayer process chemistry - Amazon S3

    After digestion about 30% of the bauxite mass remains in suspension as a thin red mud slurry of silicates, and oxides of iron and titanium. The mud-laden liquor leaving the digestion vessel is flash-cooled to atmospheric boiling point by flowing through a series of flash vessels which operate at .

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    Preheaters and Digesters in the Bayer Digestion Process ...

    Therefore, the design concept and selection principle of Bayer digestion facilities and whole systems should be considered thoroughly on the basis of analysis of chemical and mineral compositions of bauxites and the study results of the behaviors of the minerals in bauxites in the preheating and digestion process.

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    Our Products - Queensland Alumina Limited

    Alumina is produced through the Bayer process. Digestion - dissolving bauxite's alumina content Bauxite is finely ground in mills, and then mixed with a hot, caustic soda solution. This dissolves the alumina contained in the bauxite. The solution is then cooled in a series of flash tanks.

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    Bayer process chemistry - Amazon S3

    Bayer Process Chemistry By Kenneth R Seecharran Process Engineer Alumina Plant, Guymine, Linden The process of producing pure alumina from bauxite - the Bayer Process - has changed very little since its invention by Austrian chemist Karl Josef Bayer while working in Saint Petersburg, Russia. He develop a method for supplying alumina

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    Reactions of lime under high temperature Bayer digestion ...

    It is not the purpose of this paper to examine or describe these individual uses, but rather to concentrate on the reactions of lime with liquor components that underpin them. In addition, the remainder of this paper concerns only those reactions relevant to lime use .

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    THERMODYNAMIC PROCESS MODELING AND .

    Generally, two category methods are used to minimize the harmful effects of active silica in high silica bauxites on the Bayer process; 1) reduction of the reactive silica of the input feed to the process, 2) modification of the digestion process.

    • Authors: Mohammad FarrokhAbout: Materials science
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    OUTOTEC ALUMINA SOLUTIONS

    Bayer process route, such as: • Acid-based processes (hydrochloric and sulfuric or sulfurous based routes) • Lime-based sintering and complex alumino-silicate processing • Alunite roast reduction using a modified Bayer process Our offering for low-grade bauxite and non-bauxitic ores covers the following:

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    Preheaters and Digesters in the Bayer Digestion Process ...

    How to Cite. Songqing, G. and Zhonglin, Y. (2013) Preheaters and Digesters in the Bayer Digestion Process, in Essential Readings in Light Metals: Alumina and Bauxite ...

    • Authors: Gu Songqing · Yin ZhonglinAbout: Digestion · Bayer process · Bauxite
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    Conversion of ferric oxide to magnetite by hydrothermal ...

    temperature Bayer digestion process [11,12]. Meanwhile, it is noticed that the magnetic separation of iron compounds from red mud generated by high temperature digestion process is more efficient than that from raw bauxite and even than that from red mud by low temperature digestion process. The fact suggests that iron

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    Our Products - Queensland Alumina Limited

    Making Alumina. Alumina is produced through the Bayer process. Digestion - dissolving bauxite's alumina content Bauxite is finely ground in mills, and then mixed with a hot, caustic soda solution. This dissolves the alumina contained in the bauxite. The solution is then cooled in a series of flash tanks.

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    PERFORMANCE IMPROVEMENT OF ALUMINA DIGESTORS

    conventional Bayer's process comprising of material handling, bauxite slurry heaters, digestors, clarifiers, precipitators, filtration units, evaporators and calciners. The digestion efficiency is significantly affected by the mixing process occurring at all scales. Computational fluid

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    Bayer Process Alumina Production - Alcan Bayer ...

    The Bayer Process > Inventor: – Karl Josef Bayer, an Austrian chemist (1847-1904) > Patented in 1888 > What it is: – A caustic pressure hydrometallurgical process which extracts aluminium species from bauxite ore and produces alumina, an aluminium oxide (Al 2O 3), via an intermediate product called hydrate, which is an aluminium oxide tri ...

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    Bayer Process Definition of Terms - jbi.jm

    Digestion/slurry mix. Bauxite received is ground with caustic soda liquor and pumped into digestion vessel where it is heated up to temperatures below 100 o C and 260 o C. This is where the alumina is dissolved from bauxite. The mixture of aluminate in the solution and the undissolved particles go through a heat recovery process and clarification area.

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    Bayer - The Bauxite Index

    Bayer. Today the Bayer process dominates the production of alumina as it is the lowest cost production route. The process uses a recirculating volume of concentrated caustic solution to dissolve the alumina minerals, separate them from still solid impurities, and then re-precipitate alumina tri-hydrate.

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    Digestion of Alumina from Non-Magnetic Material Obtained ...

    during the Bayer process. The digestion temperature of diaspore is about 260–280 C, much higher than those of boehmite (about 230 C) and gibbsite (about 140 C).

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    Bayers process reactions - SlideShare

    Mar 15, 2015 · Precipitation 2. Desilication In the Bayer process the desilication of bauxite is an important step to maintain the alumina quality. It requires conversion of reactive silica of the bauxite into a non-soluble sodalite complex (Sodium aluminium silicate or sodalite). The desilication can be carried out before digestion or after the digestion process.

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    Mining and Refining – Energy Efficiency - World Aluminium

    The bauxite refining process requires significantly higher energy, primarily in the form of heat and steam; natural gas, coal and oil are the main fuel sources and are combusted on site. The energy required by the Bayer Process is very much dependent on the quality of the raw material, with böhemitic or diasporic bauxites requiring higher temperature digestion, often associated with a higher fuel input.

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    Bayers process reactions - SlideShare

    Mar 15, 2015 · Precipitation 2. Desilication In the Bayer process the desilication of bauxite is an important step to maintain the alumina quality. It requires conversion of reactive silica of the bauxite into a non-soluble sodalite complex (Sodium aluminium silicate or sodalite). The desilication can be carried out before digestion or after the digestion ...

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    US20070178041A1 - The bayer process for production of ...

    Bayer process, comprising grinding (L, B) and then digestion (N 2, A) of a bauxite by bringing it into contact with a sodium aluminate liquor ( 20 b, 120 b ). Digestion consists of forming a slurry ( 3 a, 103 ) that is then treated to separate insoluble residues ( 5 a, 105 a ) from the sodium aluminate liquor.

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    Energy Efficient Technologies and Operating Practices in ...

    Digestion •Digestion energy requirement varies from plant to plant on the basis of mineralogy of bauxite and temperature of digestion •NALCO processes gibbsitic Bauxite at 106-107oC •Hindalco (Belgaum) unit and Vedanta (Lanjigarh) unit processes bauxite at 142-145oC •Hindalco (Renukoot and Muri ) unit adopts double digestion technology

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    Heat of Dissolution of Gibbsite and Boehmite - SysCAD ...

    The dissolution of Gibbsite (trihydrate alumina, Al2O3•3H2O) in Bayer liquor is an endothermic (heat absorbing) reaction. The energy absorbed by this reaction accounts for a significant fraction of the energy requirement in digestion in the Bayer process and has a large effect on predicted steam requirements and the optimisation of energy use.

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