determination of reactive silica in bauxite

Inducement of Rapid analysis for Determination of Reactive ...

It was observed that developed method permits determination of reactive silica (SiO2 reactive) in bauxite and laterite containing total silica (SiO2 total) ranging from 0.50 – 25 % maximum and ...

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(PDF) Reduction of Reactive Silica from Bauxite

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.

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Reduction of Reactive Silica from Bauxite

2.3. Determination of Available Alumina and Reactive Silica The method for the determination of available alumina (the amount to be refined to obtain Al 2O3 in the Bayer process) and reactive ...

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Optimization of the reactive silica quantification method ...

May 10, 2017  For each ton of reactive silica, 0.89 tons of NaOH is lost due to the formation of sodalite. Processing bauxite with 7% reactive silica requires 0.133 Mtpa more NaOH than processing bauxite with 5% reactive silica, which is equivalent to $60 million per year at a NaOH cost of U$450 per ton.

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IS 2000-2 (1985): Methods of chemical analysis of bauxite ...

CHEMICAL ANALYSIS OF BAUXITE PART 2 DETERMINATION OF SILICA ( First Revision ) 0. FOREWORD 0.1 This Indian Standard ( Part 2 ) ( First Revision ) was adppted by the Indian Standards Institution on 24 December 1985, after the draft ... 0.3 In this revision determination of non-reactive and reactive silica have been deleted. Gravimetric method ...

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IS 2000-5 (1985): Methods of chemical analysis of bauxite ...

0.2 IS : 2000- 1962* which covered determination of loss on ignition, total silica, non-reactive and reactive silica; alumina; ferricoxide by dichromate method, permanganate and calorimetric methods; titania by reduction

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IS 2000-4 (1985): Methods of chemical analysis of bauxite ...

This part covers determination of ferric oxide. The other parts are: Part 1 Determination of loss on ignition Part 2 Determination of silica ( as SiOz, 0.5 to IO.0 percent ) Part 3 Determination of alumina Part 5 Determination of titania ( 0.5 to 12.0 percent )

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Reduction of Reactive Silica from Bauxite

2.3. Determination of Available Alumina and Reactive Silica The method for the determination of available alumina (the amount to be refined to obtain Al 2O3 in the Bayer process) and reactive ...

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IS 2000-2 (1985): Methods of chemical analysis of bauxite ...

CHEMICAL ANALYSIS OF BAUXITE PART 2 DETERMINATION OF SILICA ( First Revision ) 0. FOREWORD 0.1 This Indian Standard ( Part 2 ) ( First Revision ) was adppted by the Indian Standards Institution on 24 December 1985, after the draft ... 0.3 In this revision determination of non-reactive and reactive silica have been deleted. Gravimetric method ...

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IS 2000-5 (1985): Methods of chemical analysis of bauxite ...

0.2 IS : 2000- 1962* which covered determination of loss on ignition, total silica, non-reactive and reactive silica; alumina; ferricoxide by dichromate method, permanganate and calorimetric methods; titania by reduction

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IS 2000-1 (1985): Methods of chemical analysis of bauxite ...

1962*. This part covers determination on loss of ignition. The other parts are: Part 2 Determination of silica ( as SiOa, 0.5 to 10.0 percent ) Part 3 Determination of alumina Part 4 Determination of ferric oxide Part 5 Determination of titania ( 0.5 to 12.0 percent )

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The processing of high silica bauxites — Review of ...

Aug 01, 2009  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.

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Determination of Bauxite’s phases by the bomb digest ...

of bauxite analyses are usually done to determine loss of ignition, and alumina, silica, iron oxide and titanium contents. But recently, the range of bauxite components considered has been extended to the contaminants, substantially influencing bauxite processing (Authier-Martin et al., 2001; UNIDO, 1985).

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IS 2000-4 (1985): Methods of chemical analysis of bauxite ...

IS : 2000 ( Part 4 ) - 198s 5.2 Reagents 5.2.1 Concentrated Ammonium Hydroxide - rd = 0.90. 5.2.2 Ammonium Chloride - Solid. 5.2.3 Dilute Hydrochloric Acid I I :1 ( u.v ). 5.2.4 Stannous Chloride Solution - Dissolve by heating 60 g of pure stannous chloride in a mixture of.400 ml of concentrated hydrochloric acid and 600 ml of water until the solution is complete.

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IS 2000-3 (1985): Methods of chemical analysis of bauxite ...

IS : 2000 ( Part 3 ) - 1985 Indian Standard METHODS OF CHEMICAL ANALYSIS OF BAUXITE PART 3 DETERMINATION OF ALUMINA ( First Revision) 0. FOREWORD 0.1 This Indian Standard ( Part 3 ) ( First Revision ) was adopted by the Indian Standards Institution on 24

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Why is Guinea Bauxite Considered the Best in the World ...

Aug 02, 2017  One of the interesting features of Guinea bauxite, particularly in Boke bauxite belt is fairly low silica content and this does not increase with lowering of alumina content. 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 ...

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Beneficiation of bauxite

ctive only for the ore containing 4 to 5 reactive silica, in the light of the criteria enumerated above. Beneficiation of bauxite containing less than 4-5% silica was not found to be justifiable especially in view of the depletion of ore reserves. A typical economic analysis for bauxite containing 4'43°, reactive silica is summarised in Table Ill.

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Bauxite - ALS

Available Alumina (Av Al2O3) and Reactive Silica (Rx SiO2) which are equally important, as they define efficiency and economical amenability of the subsequent Bayer process for the extraction of alumina from the ore. Determination of these parameters was traditionally carried out by leaching bauxite ore with caustic (NaOH) solution in sealed

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Optimization of the reactive silica quantification method ...

The physical-chemical conditions of the standard method are not optimal for determining the reactive silica content. The method was optimized based on a full factorial design and regression analysis. The most important factor is the temperature, which had a positive effect on reactive silica.

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Chapter 12- The Determination of Reactive Silicate in Sea ...

1.0 Scope and field of application This procedure describes a method for the determination of reactive silicate in seawater. This method is suitable for the assay of oceanic concentrations between 0.1 mmoll -1 to 140 mmol l -1.This method is a modification of Strickland and Parsons (1968).

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BX03 - Reducing Reactive Silica Content in Washed Bauxite

Keywords: Bauxite, reactive silica, washing, additives. 1. Background As with most mineral resources, bauxite quality is generally deteriorating over time. The relative value of these deposits depends largely upon the concentration of alumina and silica, as well as the mineralogy of these constituents.

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IS 2000-5 (1985): Methods of chemical analysis of bauxite ...

0.2 IS : 2000- 1962* which covered determination of loss on ignition, total silica, non-reactive and reactive silica; alumina; ferricoxide by dichromate method, permanganate and calorimetric methods; titania by reduction

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Bauxite

(silica) present in the bauxite causes caustic soda loss in the Bayer process. The part of total silica which reacts with caustic soda and forms sodalite complex through sodium silicate route is termed as Reactive Silica. Thus, the non-reacting component of total silica with caustic soda is also known as Non-Reactive Silica.

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IS 2000-1 (1985): Methods of chemical analysis of bauxite ...

1962*. This part covers determination on loss of ignition. The other parts are: Part 2 Determination of silica ( as SiOa, 0.5 to 10.0 percent ) Part 3 Determination of alumina Part 4 Determination of ferric oxide Part 5 Determination of titania ( 0.5 to 12.0 percent )

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Bauxite - ALS

Available Alumina (Av Al2O3) and Reactive Silica (Rx SiO2) which are equally important, as they define efficiency and economical amenability of the subsequent Bayer process for the extraction of alumina from the ore. Determination of these parameters was traditionally carried out by leaching bauxite ore with caustic (NaOH) solution in sealed

More

Determination of Bauxite’s phases by the bomb digest ...

of bauxite analyses are usually done to determine loss of ignition, and alumina, silica, iron oxide and titanium contents. But recently, the range of bauxite components considered has been extended to the contaminants, substantially influencing bauxite processing (Authier-Martin et al., 2001; UNIDO, 1985).

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HINDALCO INDUSTRIES LIMITED SAMRI MINES DIVISION

Contents of Reactive Silica plays an important role to define Bauxite Determination of Reactive Silica cant not be carried out in ROM stage rather calculated during digestion stage with Caustic Soda. Increase product Cost. 5% of R.Silica is equivalent to 6.7% of Total Silica, which may go up to to 7-

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Beneficiation of bauxite

ctive only for the ore containing 4 to 5 reactive silica, in the light of the criteria enumerated above. Beneficiation of bauxite containing less than 4-5% silica was not found to be justifiable especially in view of the depletion of ore reserves. A typical economic analysis for bauxite containing 4'43°, reactive silica is summarised in Table Ill.

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Why is Guinea Bauxite Considered the Best in the World ...

Aug 02, 2017  One of the interesting features of Guinea bauxite, particularly in Boke bauxite belt is fairly low silica content and this does not increase with lowering of alumina content. 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 ...

More

Chapter 12- The Determination of Reactive Silicate in Sea ...

1.0 Scope and field of application This procedure describes a method for the determination of reactive silicate in seawater. This method is suitable for the assay of oceanic concentrations between 0.1 mmoll -1 to 140 mmol l -1.This method is a modification of Strickland and Parsons (1968).

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BAUXITE RESOURCES LIMITED - ASX

May 02, 2011  elements. Results reported by Bauxite Resources as available alumina and reactive silica represent partial extractions. Bauxite Resources documentation describes the in-laboratory quality control methods which include the use of four matrix match standards, and determination of precision and accuracy according to ISO standards.

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IS 2000-2: Methods of chemical analysis of bauxite, Part 2 ...

Title of Legally Binding Document: Methods of chemical analysis of bauxite, Part 2: Determination of silica Number of Amendments: Equivalence: Superceding: Superceded by: LEGALLY BINDING DOCUMENT Step Out From the Old to the New--Jawaharlal Nehru Invent a new India using knowledge.--Satyanarayan Gangaram Pitroda

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Bauxite Hills Mine Reserve Doubles to 96Mt

Jan 18, 2017  The bauxite deposits generally consist of a single flat-lying pisolitic bauxite layer, generally 0.5m - 3m thick that is ... available alumina and reactive silica values using Ordinary Kriging of the filtered (bauxite) analyses. A considerable ... the average search distance and the determination of whether assays are measured or correlated ...

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Determination of Dissolved Silica and Common Anions

Determination of Dissolved Silica and Common Anions Using Dual Detection IntroductIon One of the most abundant elements on earth, sili-con is found in a variety of forms, many of which are polymeric, and all being weakly acidic. Silicon and its compounds are used in the manufacture of glass, ceram-

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