EP0950020A1
A process for removing silica from bauxite is disclosed. The method includes the step of mixing bauxite with a caustic liquor to form a mixture and to dissolve and stabilise at least a substantial part of the reactive silica from the bauxite. ... Modifying Bayer process for processing low-grade diaspore bauxite and producing alumina ...
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Selective Processing of the Kaolinite Fraction of High-Silicon …
Improving kaolinite-bearing bauxite by preroasting is a potential method for removing silica from ore and incorporating it into the Bayer process. Caustic soda …
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Extraction of alumina and silica from high-silica bauxite by …
In this paper, a novel process is proposed to extract Al 2 O 3 and SiO 2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na 2 CO 3 followed by two-step leaching with water and sulfuric acid.
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Selective Processing of the Kaolinite Fraction of High-Silicon Bauxite
Improving kaolinite-bearing bauxite by preroasting is a potential method for removing silica from ore and incorporating it into the Bayer process. Caustic soda consumption is significantly reduced if precalcined bauxite is used in the Bayer process [ 6 ].
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The Processing of High Silica Bauxites
In this paper, a novel process is proposed to extract Al2O3 and SiO2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na2CO3 followed by two …
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The Processing of High Silica Bauxites
In this paper, a novel process is proposed to extract Al2O3 and SiO2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na2CO3 followed by two-step leaching...
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Removal of silicates from gibbsite-bauxite ore by using …
This paper is one of a study that implements reverse flotation methods as an alternative beneficiation on bauxite processing. This study is aimed at decrease silica content …
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Extraction of alumina and silica from high-silica …
In this paper, a novel process is proposed to extract Al 2 O 3 and SiO 2 from high-silica bauxite without residue discharge, that is, sintering bauxite with Na 2 CO 3 followed by two-step leaching with water and sulfuric acid.
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Desilication and recycling of alkali-silicate solution seeded …
Bauxite underwent cyclic desilication and the alumina/silica ratio was increased from ∼4.1 to >7.5. Effective utilization of red mud and alkali-silicate solution greatly reduces the cost of the desilication process, thereby making it applicable to low-grade bauxite in the Bayer process.
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Beneficiation of bauxite ores
It is widely recognized that the bauxite ore should be beneficiated, preferably where it is mined, to remove silica, iron, ... The other challenge faced by the industry is the management of large volumes of bauxite residue generated from processing bauxite ores. Hindalco has become the world's first company to achieve red mud utilization ...
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MANAGEMENT AND CONTROL OF SILICA IN THE BAYER …
Silica enters the process with the bauxite as clays and other silica containing minerals. The range of materials will vary depending on the bauxite source but generally at least some component …
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MANAGEMENT AND CONTROL OF SILICA IN THE …
method for removing silica from Bayer liquor which does not lead to soda loss. A side implication of this is that bauxites containing high amounts of reactive silica (>8 wt%) are eff ectively consigned ... digestion used for boehmitic bauxite processing (220 to 270 deg C) and in the sinter process, so called "quartz attack" by caustic can ...
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Economic Processing of High Silica Bauxites
processing of high silica bauxites. High silica bauxites are usually considered to be those with reactive silica contents 1 in excess of ~8% by weight of the bauxite.
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Chemical Processing of Bauxite: Alumina and Silica …
As for the dual stream flowsheet, chemical cleaning using dilute sulphuric acid is effective at removing the silica scale. For removal of the titanate scale, mechanical cleaning is required. The use of mechanical cleaning methods …
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The processing of high silica bauxites
This 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 …
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Process for removing reactive silica from a bayer process …
The silica could then be recovered as a clean product for sale or further processing. It is an object of the present invention to provide such a process. ... The present invention provides a process for removing silica from bauxite that may allow for substantially complete removal (certainly in excess of 80% removal) of reactive silica from the ...
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Bauxite Beneficiation: An Approach to Value Addition in …
The main objective of bauxite beneficiation is to lower the concentration of reactive silica, in the form of kaolinitic clay, and also to increase the alumina content.
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Chemical Processing of Bauxite: Alumina and Silica …
As for the dual stream flowsheet, chemical cleaning using dilute sulphuric acid is effective at removing the silica scale. For removal of the titanate scale, mechanical cleaning is required. The use of mechanical cleaning methods such as 'pigging' of heater tubes assists to reduce downtime and thereby maximize heater circuit availability.
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BX03
Efforts to remove reactive silica from bauxite ore prior to shipment have largely focused on gravitational methods such as washing, screening and the use of hydrocyclones. The purpose …
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Simultaneous Application of Oxalic Acid and Sodium …
Bauxite is widely used to produce alumina. There are many bauxite resources with high iron content. These resources could not be processed and utilized efficiently due to the high concentration of iron (Fe). The alkaline leaching process has been proposed to remove iron from these bauxite resources. Therefore, in this study, the alkaline leaching process was employed, …
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Four Bauxite Beneficiation Methods
The main beneficiation methods of bauxite are washing, flotation, magnetic separation, chemical beneficiation, etc.The process of separating concentrates from bauxite ore is actually a process of removing gangue minerals and harmful impurities, and separating high-aluminum minerals and low-aluminum minerals to obtain concentrates with a high aluminum …
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US Patent for Process for removing reactive silica from a …
A process for the removal of reactive silica from a feedstock to the digestion step of the Bayer process for the manufacture of alumina, in which (a) the feedstock is contacted with a caustic liquor under process conditions which result in dissolving and stabilizing at least 50% of the silica into solution at a level of at least 3 gpL and without significant precipitation from …
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MANAGEMENT AND CONTROL OF SILICA IN THE …
Silica enters the process with the bauxite as clays and other silica containing minerals. The range of materials will vary depending on the bauxite source but generally at least some component (the reactive silica) dissolves under digestion conditions resulting in silica of some form in solution. Under process conditions this
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The processing of high silica bauxites
This 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 …
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Bauxite Beneficiation: An Approach to Value Addition in …
There are some distinct advantages of processing washed bauxite, particularly for the low temperature alumina refineries using gibbsitic bauxite for sweetener in the high temperature plants. ... Goswami R (2018) An initiative to remove silica from bauxite ore, In: 8th annual IBAAS conference, Mumbai, September 2018. Google Scholar Chaves AP ...
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BX03
Efforts to remove reactive silica from bauxite ore prior to shipment have largely focused on gravitational methods such as washing, screening and the use of hydrocyclones. The purpose of this work was to identify additives which might enhance this separation process economically.
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removing silica and iron from bauxite
Removing Silica For Bauxite Processing. separation process to remove feldspar and, iron content of potash feldspar powder for, is primarily used to remove the iron, silica sand processing; . silica removal from bauxite by screening -, Silica content is usually very low in Greek, A process for removing this kaolin comprises, containing iron ...
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Bauxite Processing Residue: A Critical Review of Its …
Bauxite is processed in alumina refineries by the Bayer process in which Al-containing minerals are dissolved in hot NaOH. The insoluble solids (bauxite processing residue mud and sand) are washed ...
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(PDF) Chemical Processing of Bauxite: Alumina and Silica …
This Chapter provides an introduction to the Bayer process and how the mineral composition of bauxites affects the process variants and the principal parameters to be selected.
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Pilot Tests with Tertiary Cyclone for Reactive Silica …
recovery of alumina and 45.9 % recovery of silica to product. Keywords: Bauxite beneficiation, Clay removal, Silica reduction, Hydrocyclones. 1. Introduction Bauxite is the main ore for production of metallic aluminum. Production is generally carried out by the Bayer process to form alumina, followed by the Hall-Héroult process to carry out the
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