Mining and Refining – Energy Efficiency

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 ...

Bauxite Ore - micro.magnet.fsu.edu

The Bayer process, still economically the most feasible method for extracting aluminum from bauxite ore, involves mining, dissolving the alumina at an elevated temperature, adding flocculants, precipitating pure gibbsite, and heating the gibbsite to 1,100 degrees Celsius to yield alumina by calcination.

An Overview of Bauxite Residue Utilisation

Serpeck process at high temperature in a reducing environment in presence of coke and nitrogen [6].The Bayer process[7] is the most economic and prevalent method employed for extraction of alumina from bauxite, where it contains sufficient Al2O3 content. Bauxite of higher silica content is not suitable for the Bayer process and is more ...

Identification and Description of Mineral Processing ...

process can be carried out in a variety of ways depending upon bauxite properties and optimum economic tradeoffs. Each step of the Bayer process is discussed in further detail below.7 Ore Preparation Bauxite mining processes depend largely on the nature of the ore body. If the ore is not uniform, contains an

Bauxite Deposits - an overview | ScienceDirect Topics

Bauxite deposits invariably contain a range of impurities, ranging from organic material to trace elements such as Ga, Zn, Pb, P and Be. Table 2.1 shows typical compositions of a range of smelter aluminas. In the Bayer process, many impurities are at least partially soluble in the caustic digestion liquor and may be carried over into precipitation if they are not removed in the desilication ...

Bayer Process – Jamaica Bauxite Institute (JBI)

The production of alumina from bauxite is carried out by the use of the Bayer Process. The process was invented in 1888 by an Austrian, Karl Joseph Bayer. Bayer discovered that when bauxite was mixed with caustic soda, the alumina content in the bauxite would dissolve and separate itself from the other components, such as iron and silica, which ...

Earlham College Geo 211 Bauxite

The Bayer process is the manner in which bauxite is converted into alumina. Alumina is anhydrous aluminum oxide, a fine white powder. Alumina is a valuble commodity because from alumina one can produce aluminum; 90% of the world's alumina goes to produce aluminum.

Methods for Alkaline Recovery of Aluminum from Bauxite ...

May 05, 2016· Different ways for alkaline recovery of aluminum from bauxite residue are considered from the literature and examined in experiments. The advantages and disadvantages of a high-temperature digestion via Bayer process and soda-lime sintering process are elaborated and compared. As a hybrid process, bauxite residue undergoes a reductive smelting process with lime …

Bauxite - an overview | ScienceDirect Topics

12.2 alumina from bauxite: the bayer process Bauxite, the principal ore used for aluminum smelting, is named after Les Baux, Provence, the village where the first deposits were discovered. Bauxite contains hydrated alumina equivalent to as much as 40–60% Al 2 O 3, and is free of the other siliceous materials leached out over time.

Method of digesting bauxite via the Bayer process with the ...

We claim: 1. In the Bayer process for the separation of alumina from goethite-containing or alumo-goethite-containing bauxite by digestion with aqueous caustic soda, the improvement whereby the settling rate of the resulting suspended solids in the digested mixture is increased by the chemical conversion of a portion of the goethite to hematite and magnetite, said improvement comprising ...

Bauxite - ALS

bauxite in a refinery using a wet chemical caustic soda leach process known as the Bayer process. The alumina is then converted to aluminium metal via electrolysis in a smelter using the energy-intensive Hall-Heroult process. Bauxite formation Bauxite forms from the breakdown of clays when large amounts

Bauxite - Wikipedia

Bauxite is the main source of the rare metal gallium. During the processing of bauxite to alumina in the Bayer process, gallium accumulates in the sodium hydroxide liquor. From this it can be extracted by a variety of methods. The most recent is the use of ion-exchange resin.

Bauxite - SlideShare

Aug 29, 2015· Bauxite 1. PRESENTED BY AZEEZ AKEEM ABIODUN HENRY K WEEFAR Lecturer: Dr. A.R Adetunji 2. Outlines Introduction History of bauxite Chemical composition and Physical appearance of Bauxite World reserve of bauxite Bauxite mining Refining bauxite Bayer's process Alumina to Aluminium Uses of Aluminium References 2

4. EXISTING WAGERUP REFINERY 4.1 ALUMINA REFINING …

A simplified process flow diagram of the Bayer process used at the Wagerup refinery is presented in Figure 6. 4.1.1 Bauxite Grinding and Slurry Storage Bauxite is ground to less than 1.5 mm particle size at the refinery, using semi-autogenous grinding mills (SAG and/or Ball mills) to ensure sufficient solid-liquid contact during the

Bauxite Mining and Alumina Refining: Process Description ...

The bauxite ore, Bayer process materials before precipitation, mud residue, and sand residue are therefore of radiological interest, whereas the alumina product is not. 8 Positional and personal monitoring data from bauxite mines and alumina refineries in Western Australia have been used to assess the above-background annual doses for the ...

what bauxite deposits suitable for bayer process

Bauxite Deposits For Yer Process Thai Physio. Bauxite Deposits For Yer Process Bauxite used for aluminum production bauxite is the principal ore of aluminum the first step in producing aluminum is to crush the bauxite and purify it using the bayer process in the bayer process the bauxite is washed in a hot solution of sodium hydroxide which leaches aluminum from the bauxite More Details

Bauxite | Geoscience Australia

Dec 31, 2016· In most commercial operations, alumina is extracted (refined) from bauxite by a wet chemical caustic leach process known as the Bayer process. The alumina is then smelted using the energy-intensive Hall-Heroult process to produce aluminium metal by electrolytic reduction in a molten bath of natural or synthetic cryolite (NaAlF 6 ).

Pre-desilication and digestion of gibbsitic bauxite with ...

Nov 14, 2012· The effect of lime on the pre-desilication and digestion of gibbsitic bauxite in synthetic sodium aluminate liquor at different temperatures was investigated. The bauxite is comprised of gibbsite, aluminogoethite, hematite, kaolin, quartz, and minor boehmite. Lime increases the desilication efficiency of the bauxite during the pre-desilication process by promoting the conversion of sodalite ...


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