Determination Of Reactive Silica In Bauxite

  • 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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  • STUDY ON ORE DRESSING AND CHARACTERIZATION OF …

    2.2 – Determination of Available Alumina and Reactive Silica The method for determination of available alumina (the amount that will be refined to obtain Al2O3 in the Bayer Process) and reactive silica (kaolinite), consisted of bauxite digestion in alkaline medium (NaOH) under controlled pressure and temperature, simulating the Bayer process. ...

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  • US6309615B1 - 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 solution of ...

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  • (PDF) Reduction of Reactive Silica from Bauxite ...

    Determination of Available Alumina and Reactive SilicaThe method for the determination of available alumina (the amount to be refined to obtain Al 2 O 3 in the Bayer process) and reactive silica (kaolinite), consisted of bauxite digestion in alkaline medium (NaOH) under controlled pressure and temperature, simulating the Bayer process.

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  • DETERMINATION OF REACTIVE SILICA IN FLY ASH ...

    Aug 02, 2017· DETERMINATION OF REACTIVE SILICA IN FLY ASH GRAVIMETRICALLY. Posted on August 2, 2017 November 30, 2017 by MSK Admin. Introduction: Fly ash is a fine powder obtained as a by-product when pulverized coal undergoes combustion in an electric generation power plants. The fly ash particles so obtained come out of the boiler along with the flue gases ...

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  • Inducement of Rapid analysis for Determination of Reactive ...

    A rapid analysis procedure has been developed for quantitative determination of reactive silica and available alumina in bauxite. The method involved selective leaching of reactive silica in an...

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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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  • Reasons For Bauxite Beneficiation - Hatch Ltd

    Due to the high grade of reactive silica in the Brazilian bauxite ores, the Brazilian mines have included a beneficiation plant to reduce the reactive silica prior to the refinery, by removing the finer fraction of the material, usually under 37 μm. Adopting the process of washing bauxite in the beneficiation plant can reduce caustic soda ...

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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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  • (PDF) Reduction of Reactive Silica from Bauxite

    Some bauxites have high chemical contents of reactive silica and other impurities, being considered marginal bauxites. Nowadays, these bauxites are not used for the production of alumina by the...

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  • Desilication and recycling of alkali-silicate solution ...

    Jul 01, 2020· 1. Introduction. Silicon is the main impurity in high-silica bauxite , , and causes scaling on plant surfaces while affecting the quality of alumina during alumina production, using alkaline methods such as the conventional Bayer process , , .With the increasing demand for alumina refineries, the utilization of low-grade high-silica bauxite has attracted substantial …

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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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  • WO1998022390A1 - Removal of silica from bauxite - Google ...

    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. The caustic liquor is selected to have a high caustic concentration and a high alumina content.

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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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  • 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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  • 4500-SiO2 SILICA - Standard Methods For the Examination of ...

    Methods 3120 and 3125 determine total silica. 4500-SiO 2.C, D, E, and F determine molybdate-reactive silica. As noted in 4500-SiO 2.C.4, it is possible to convert other forms of silica to the molybdate-reactive form for determination by these methods. Method 3111D determines more than one form of silica.

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  • , Gopal Krishan, S. D. Prajapati and Rakesh Saini

    Reactive silica is one of the parameter that determines the pozzolanic potential of a fly ash that is its tendency to react with available calcium hydroxide to form cementitious hydration products. EXPERIMENITAL Methods The method for determination of reactive silica consists following steps 1. Determination of total silica 2.

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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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  • Optimization of the reactive silica quantification method ...

    Optimization of the reactive silica quantification method applied to Paragominas-type gibbsitic bauxites. Author links open overlay panel S.P.A. Paz a b c R.S. Angélica c H. Kahn a. Show more. Share.

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  • Reconciliation of sampling data and heterogeneity analysis ...

    The higher the reactive silica content, the higher the amount of soda needed for bauxite processing in the refinery. Considering a constant production of bauxite for the next 10 years of 50 thousand tons per month according to the forecasts made by the planning team, an additional amount of approximately 130 tons of soda would be needed during ...

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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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  • 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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  • THRESHOLD VALUE OF BAUXITE - IBM

    • 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. • 5% of R.Silica is equivalent to 6.7% of Total Silica, which may go up to to 7-8%

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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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  • Optimization of the reactive silica quantification method ...

    May 10, 2017· This study presents an optimization of the method used to quantify reactive silica (RxSiO2) in gibbsitic bauxites, specifically those which contain no (or insignificant) quartz. In this work they are named as Paragominas-type Bauxites. A factorial design of experiments was used.

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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 …

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  • Is Low Silica in Bauxite a Problem in Bayer Alumina Plant

    Apr 02, 2014· Generally, it has been seen from bauxite analysis that Reactive silica in bauxite ranges from 50% to 80% out of Total silica in bauxite. Plant operation is affected because of high silica in bauxite as it has high settling velocity and abnormally high abrasive nature.

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  • Bauxite mining's unhealthy effects on people, environment

    Jan 14, 2016· Natural bauxite ore consists of aluminum hydroxide, iron oxide, titanium oxide and reactive silica - the substances of which affect human health. Aluminum hydroxide is the main content of the ...

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  • Bauxite mining's unhealthy effects on people, environment

    Jan 14, 2016· Natural bauxite ore consists of aluminum hydroxide, iron oxide, titanium oxide and reactive silica - the substances of which affect human health. …

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  • Bauxite Beneficiation & Flotation | Silica & Iron ...

    The reactive silica content not only increases the volume of red mud, but also consumes caustic soda reagent and reduces the yield of Al2O3 recovered from the bauxite. Therefore, there is both an economic and environmental argument to be made for improving the quality of bauxite …

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  • Simultaneous determination of alumina and silica in ...

    Sep 01, 1975· A method is described for the accurate and precise determination of alumina and silica in bauxites with the aid of a 227 Ac-Be isotopic neutron source with a total neutron output of 10 8 n s-1.Three ores can be analysed in triplicate within 4 h, including the determination of the natural radioactivity of the ores.

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  • Metro Mining

    Jul 14, 2016· reactive silica (Rx SiO2), which typically ranges from 50% to 80% of total silica. A module – the ratio of total Al2O3 to total SiO2 - above 8 is generally considered preferable. Value in use drives the bauxite blend specification, with tolerance for higher silica inversely correlated with …

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  • THE VALUE OF MINERALOGICAL MONITORING FOR THE …

    Jan 18, 2021· Figure 3. Comparison of total available alumina and reactive silica as obtained by XRD with the reference values (wet chemistry) 20 samples from a Northern Brazil bauxite mine were analyzed. The mineralogical composition was quantified and used for the calculation of the total available alumina and reactive silica.

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  • Manual of Procedure for Chemical and Instrumental Analysis of

    6.9 determination of phenolic compounds as c 6h 5oh(direct colorimetric method) 214 6.10 determination of oil and grease in water and waste water 216 6.11 analysis of sulphate in water and waste water/effluent 217 6.12 determination of sulphide in water & waste water 219 6.13 analysis of silica in water and waste water 221

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  • Recovery of Fine Aluminum Hydroxide with High Whiteness ...

    clay (silicate) or other insoluble minerals. The reactive silica was 6.75% (of the total 8.65% SiO2), representing a poor quality bauxite according to commercial practice, with the ratio of TAA/Reactive silica of <10) [3,28]. All reagents used in this study (sodium hydroxide, oxalic acid) were of analytical grade and supplied by

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  • EP0950020A1 - Removal of silica from bauxite - Google Patents

    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. The caustic liquor is selected to have a high caustic concentration and a high alumina content.

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

    Dec 24, 1985· 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 December 1985, after the draft finali-

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  • (PDF) Beneficiation of Bauxite – Upgrading of Recoverable ...

    Example of a semi-mobile bauxite beneficiation plantAt a South American bauxite area it was the target of the mine operator to increase the remaining lifetime of the established mine areas by extracting those parts of the deposit that had not been mined in the past owing to an excessive content of reactive silica. The high content of reactive ...

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  • 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

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