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The processing of high silica bauxites — Review of

2009-8-1  1. Introduction1.1.. ScopeThis document will critically review existing and potential processes for the processing of high silica bauxites. High silica bauxites are usually considered to be those with reactive silica contents in excess of ∼. 8% by weight of the bauxite (reactive silica is defined later in this paper).. This review is limited to bauxites as feedstocks for the processes.

The Processing of High Silica Bauxites — Review of

World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.

The processing of high silica bauxites — Review of

World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing. As the economic reserves of high grade ores diminish, attention is turning to how these lower grade ores may be processed at reasonable cost.

The processing of high silica bauxites ― Review of

2009-8-1  Abstract World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing. As the economic reserves of high grade ores diminish, attention is turning to how these lower grade ores may be processed at reasonable cost.

Economic Processing of High Silica Bauxites Existing

High silica bauxites are usually considered to be those with reactive silica contents 1 in excess of ~8% by weight of the bauxite. “Economic processing” is meant to imply production of alumina

The Processing of High Quartz Bauxite SpringerLink

Low-grade bauxite refers to bauxite that is high in silica, which is present as kaolin, or quartz, and therefore requires different approaches for processing. With digestion of gibbsitic bauxites the quartz would remain largely undissolved.

Beneficiation of High Silica Bauxite Ores of India an

Options for processing of high silica bauxites, Peter Smith and Bingan Xu–Parker, ICSOBA-2010, Travaux Vol. 35 (2010) No. 39 Pageno:184–192 Google Scholar Characterization and Beneficiation studies of Bauxite ores for Reduction of Reactive Silica and Iron, Prof B.K. Mishra, Report No: 861/MP/SSP 188 /May/2012, CSIR-Institute of Minerals and

Regulating the digestion of high silica bauxite with

2010-9-1  1. Introduction. The characteristics of Chinese bauxite are high alumina, high silica, low ferrite, and middle- and low-grade diasporic bauxite (Niu, 2003, Yang, 2006).Consequently a combination process (Gu, 2004, Ai and Cheng, 2002) is mainly used to produce alumina in China, in which the flow is complicated and the energy consumption is high.The Bayer process is an

The processing of high silica bauxites ― Review of

2009-8-1  Abstract World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing. As the economic reserves of high grade ores diminish, attention is turning to how these lower grade ores may be processed at reasonable cost.

10.1016/j.hydromet.2009.04.015 DeepDyve

2020-6-11  The benefits for high silica bauxite processing come from the reduction of digestion temperature and the consequent reduction (or elimination) of quartz attack that would normally occur under the temperatures commonly used to digest boehmitic bauxite. Comalco (Rio Tinto) has a number of patents over this process ( Hollitt et al., 2000, 2001

Mining and Refining Process World Aluminium

Bauxites that have high levels of silica (SiO 2) go through a process to remove this impurity. Silica can cause problems with scale formation and quality of the final product. 3. Digestion. A hot caustic soda (NaOH) solution is used to

(PDF) Mechanochemical treatment of high silica bauxite

Baksa et al. (1986) estimated that soda at temperatures ranging from 100 to 250 °C, depending required for processing high silica bauxites accounts for on the form of alumina in the bauxite, e.g. gibbsitic, as much as 20% of alumina production costs. boehmitic or diasporic.

Improvement of Processing Characteristics of High

Investigation was made of process characteristics of roasted bauxite and feasibility is shown of its processing by a simplified Bayer cycle eliminating the necessity of soda, sulfates and other impurities removal from the process which brings about reduction in the cost as compared with processing of raw bauxite at Ural refineries.

(PDF) Extracting Silica and Alumina from Low-Grade Bauxite

Alkali leaching of silica from activation-roasted high-silica bauxite can increase the mass ratio of alumina to silica (A/S) in the residue and favors alumina extraction by the Bayer process.

Bauxite ALS

2017-2-1  mineralogy (high processing costs) than lateritic deposits. Most bauxite mines produce Direct Shipping Ore (DSO) bauxite as they require no processing before being sent to a refinery. However, some bauxites require some form of screening (either wet or dry) to remove the fine grained material to improve the grade and/or handleability.

(PDF) Beneficiation of Bauxite Upgrading of Recoverable

Intensified sintering process with refined or high-grade bauxite as charge increases greatly output under the present condition, which reduces the energy consumption and operation cost, thus traditional sintering process revives.,puplished as part of the Asia-Pacific Partnership Project (ATF-06-4), High Silica Bauxite Processing, 2008

The Bayer digestion behaviour of transition aluminas

2013-7-10  To maintain economic alumina production, a number of investigations have been conducted to try and minimise the impact of silica on the economics of existing processes and to develop new methods for processing high silica bauxite (Smith, 2009).One of the methods is to effectively pre-concentrate high silica bauxite or aluminous minerals by the roast-leach

Peter SMITH The Commonwealth Scientific and Industrial

World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.

Mechanochemical treatment of high silica bauxite with

World reserves of bauxite include vast quantities of ore which at present are sub-economic due to high levels of reactive silica that cause expensive loss of caustic soda during Bayer processing.

(PDF) Mechanochemical treatment of high silica bauxite

Baksa et al. (1986) estimated that soda at temperatures ranging from 100 to 250 °C, depending required for processing high silica bauxites accounts for on the form of alumina in the bauxite, e.g. gibbsitic, as much as 20% of alumina production costs. boehmitic or diasporic.

Mining and Refining Process World Aluminium

Bauxites that have high levels of silica (SiO 2) go through a process to remove this impurity. Silica can cause problems with scale formation and quality of the final product. 3. Digestion. A hot caustic soda (NaOH) solution is used to

Bauxite Alufer Mining Limited

Typically, a bauxite resource contains 30-60% alumina (Al 2 O 3), and occurs as two main types: trihydrate (“low temperature”) bauxite and monohydrate (“high temperature”) bauxite . The other main indicator of bauxite quality is the silica content, usually reactive silica for a low temperature bauxite or total silica for a high temperature bauxite

RECOVERY OF SODA FROM BAUXITE RESIDUE BY ACID

A worldwide trend of declining bauxite grades underlines the importance of research into practical ways of processing high silica bauxites. The existing and potential processes for processing high silica bauxite have been reviewed by Smith (2009). He categorized options into three strategies reduce reactive silica

Extraction of Alumina from high-silica bauxite by

2016-2-23  Extraction of Alumina from high-silica bauxite by hydrochloric acid leaching using preliminary roasting method. D V Valeev 1, E R Mansurova 1, V A Bychinskii 2 and K V Chudnenko 2. Published under licence by IOP Publishing Ltd IOP Conference Series: Materials Science and Engineering, Volume 110, conference 1

(PDF) Reduction of Reactive Silica from Bauxite

The first fraction corresponded to crystallized bauxite (CB), commercially exploited by industry, whereas the other one corresponded to crystallized amorphous bauxite (CAB) a marginal bauxite unprofitable to the Bayer process due to its high contents of reactive silica, with particle size lower than 100 mm. Samples were submitted to a study

Why is Guinea Bauxite Considered the Best in

2017-8-2  About 50% of total silica is in the form of reactive silica and about 1.2 to 1.8% reactive silica, in average, makes them ideal for processing in the low temperature alumina refinery. Alumina content varies from medium (40%) to

The Transformation of Bauxite to Aluminum

An electrical current is run through the mixture, causing the carbon from the carbon anode to attach to the oxygen component in the alumina, yielding aluminum and carbon dioxide: 2 Al2O3 + 3 C > 4 Al + 3 CO2. This process

中南大学 李小斌

2022-1-4  Additionally, several other innovative technologies, including calcium-free reductive Bayer digestion for diasporic bauxite, efficient and comprehensive utilization of high-iron/sulfur/silica bauxite, red mud (bauxite residue) discharge reduction, and intensified seeded