bauxite digestion procedure in kazakhstan

The process stages are 1 Milling The bauxite is washed and crushed reducing the particle size and increasing the available surface area for the digestion stage Lime and spent liquor caustic soda returned from the precipitation stage are added at the mills to make a pumpable slurry 2 Desilication...We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment. which can crush all kinds of metal and non-metallic ore, also can be dry grinding and wet grinding.If you are interested in our products or want to visit the nearby production site, you can click the button below to consult us.Welcome to our factory to test machine for free!

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  • Mining and Refining – Process

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    The process stages are 1 Milling The bauxite is washed and crushed reducing the particle size and increasing the available surface area for the digestion stage Lime and spent liquor caustic soda returned from the precipitation stage are added at the mills to make a pumpable slurry 2 Desilication

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  • PDF Inaccuracies in Estimation of Bauxite Extractable

    PDF Inaccuracies in Estimation of Bauxite Extractable

    process bauxite and they are tuned to a specific raw material A major change in mineralogical characteristics of the raw material calls for revision of the refinery set up 29 – 31

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  • KINETICS ANALYSIS FOR ALUMINUM DISSOLUTION OF

    KINETICS ANALYSIS FOR ALUMINUM DISSOLUTION OF

    Kinetics model was developed for aluminum dissolution of West Kalimantan bauxite based on shrinking core model A series of digestion tests was carried out to study aluminum dissolution from the ore sample with particles size distribution of 100 passing 60 mesh in 129 gpL of NaOH The digestion tests were conducted at 140 150

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  • Microwave digestion of gibbsite and bauxite in sodium

    Microwave digestion of gibbsite and bauxite in sodium

    Mar 01 2020 · Aluminum metal and its oxide are two important materials used in todays society In 2015 alone 120 million metric tons of aluminum oxide Bray 2017a and 575 million metric tons of aluminum were produced Bray 2017bThese materials are extracted from bauxite ore through the highlighted digestion step in the process shown in Fig e is made up of multiple minerals which vary in

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  • ARTICLE Addressing the Challenge of Bauxite Residue

    ARTICLE Addressing the Challenge of Bauxite Residue

    Mar 11 2019 · Bauxite ore contains 3060 aluminum oxide Al 2 O 3 In the Bayer process Figure 2 the bauxite is digested in a pressure vessel along with a sodium hydroxide solution caustic soda at an elevated temperature which dissolves the aluminum oxide converting it into sodium aluminate leaving insoluble red mud solids as a byproduct

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  • Aluminum processing  Ores  Britannica

    Aluminum processing Ores Britannica

    The Bayer process involves four steps digestion clarification precipitation and calcination In the first step bauxite is ground slurried with a solution of caustic soda sodium hydroxide and pumped into large pressure tanks called digesters where the ore is subjected to steam heat and pressure The sodium hydroxide reacts with the aluminous minerals of bauxite to form a saturated solution of sodium

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  • Understanding desilication products in bauxite refinery

    Understanding desilication products in bauxite refinery

    Bauxite refinery residue red mud is a waste byproduct generated by the extraction of alumina from bauxite ores 13 Bauxite residue is generated through the Bayer process which involves the digestion of bauxite ore using concentrated sodium hydroxide at elevated temperatures and pressures 1 3 4 The residue is a hazardous

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  • Bharat Aluminium Company Ltd BALCO  INDIA

    Bharat Aluminium Company Ltd BALCO INDIA

    concentration bauxite mineralogy and charge quantity The productivity of the entire Bayer process depends to a large extent on the digestion process Highpressure digestion 235 to 245 DC is used for boehmitic and diasporic bauxites A need has been felt to optimize the digestion conditions in order to achieve low caustic soda loss

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  • Bayer Process  an overview  ScienceDirect Topics

    Bayer Process an overview ScienceDirect Topics

    The monohydrate bauxite require higher caustic concentrations 200–300 g per liter Na 2 O up to 4 hr of digestion and temperatures of 200–300 °C to obtain complete dissolution Digestion is performed in steamheated steel autoclaves or tubular reactors at pressures of up to 35 MPa Further desilication takes place during digestion

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  • Modelling and optimization of digestion efficiency of

    Modelling and optimization of digestion efficiency of

    the design criteria of process bauxite characteristics and maximum capacity of the equipment Table 4 Levels of parameters affecting the digestion of bauxite Lime of bauxite Digestion residence time min Na2O gL Temperature Centigrade Parameters Upper level 275

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  • PDF Predesilication and digestion of gibbsitic bauxite

    PDF Predesilication and digestion of gibbsitic bauxite

    During the bauxite digestion process the desilication reactions are quite complicated because of the various minerals in bauxites and the changeable digestion conditions Pan et al 2012 Pan et

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  • Predesilication and digestion of gibbsitic bauxite with

    Predesilication and digestion of gibbsitic bauxite with

    Nov 14 2012 · The effect of lime on the predesilication 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 predesilication process by promoting the conversion of sodalite

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  • Mining and Refining – Bauxite Residue Management

    Mining and Refining – Bauxite Residue Management

    It is primarily composed of the insoluble fraction of the bauxite ore that remains after extraction of the aluminiumcontaining components Iron oxides 10 – 30 titanium dioxide 2 – 15 silicon oxide 5 – 20 and undissolved alumina 0 – 20 make up the residue together with a wide range of other oxides which will vary according to the initial bauxite source

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  • Understanding desilication products in bauxite refinery

    Understanding desilication products in bauxite refinery

    Bauxite refinery residue red mud is a waste byproduct generated by the extraction of alumina from bauxite ores 13 Bauxite residue is generated through the Bayer process which involves the digestion of bauxite ore using concentrated sodium hydroxide at elevated temperatures and pressures 1 3 4 The residue is a hazardous

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  • Mining and Refining – Process  World Aluminium

    Mining and Refining – Process World Aluminium

    The bauxite layer beneath the overburden is broken up using methods such a blasting drilling and ripping with very large bulldozers Once the bauxite is loosened into manageable pieces it is generally loaded into trucks railroad cars or conveyors and transported to crushing and washing plants or to stockpiles before being shipped to alumina

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  • The Transformation of Bauxite to Aluminum and the

    The Transformation of Bauxite to Aluminum and the

    Crushed and washed bauxite ore must first go through a process to remove any silica found in the bauxite which would otherwise hinder the process and result in a product of lesser quality In a process known as digestion after any silica has been removed the remaining bauxite ore is combined with a hot caustic soda material in a heated

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  • 14 questions with answers in BAUXITES  Science topic

    14 questions with answers in BAUXITES Science topic

    Sep 22 2020 · Removing kaolinite from bauxite using flotation method will depend on the liberation of bauxite grains from silica grains It becomes a problem when the

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  • Bayer process  industrial process  Britannica

    Bayer process industrial process Britannica

    Other articles where Bayer process is discussed alumina extracted from bauxite through the Bayer process which was developed for the aluminum industry in 1888 In the Bayer process bauxite is crushed mixed in a solution of sodium hydroxide and seeded with crystals to precipitate aluminum hydroxide The hydroxide is heated in a kiln in order to drive off

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  • Handling of bauxite  Loading discharging  environmental

    Handling of bauxite Loading discharging environmental

    1 the draft Test Procedure for Determining the TML for Bauxite2 the draft individual schedule for Bauxite of Group A having the Bulk Cargo Shipping Name BAUXITE FINES and3 the draft amendments to the individual schedule for Bauxite of Group C as set out in annexes 1 to 3 respectively for submission to the Maritime Safety Committee

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  • Alumina Refining  The Australian Aluminium Council

    Alumina Refining The Australian Aluminium Council

    The Bayer refining process used by alumina refineries worldwide involves four steps digestion clarification precipitation and calcination Digestion Bauxite is finely ground in mills then mixed with a recycled caustic soda solution and steam in digester vessels operating at high temperature and pressure

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  • Alumina Tube Digestion  Hatch Ltd

    Alumina Tube Digestion Hatch Ltd

    This simplifies the digestion plant and allows a singlestream flow sheet to be employed A semiautomatic valve design avoids heat stress and dehydration while providing operational security With technology partner Outotec our patented tube digestion technology is a highcapacity solution that can reduce a facility’s energy consumption by

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  • ESTIMATION OF AVAILABLE ALUMINA IN BAUXITE BY WET

    ESTIMATION OF AVAILABLE ALUMINA IN BAUXITE BY WET

    The experimental procedure involves digestion of 1 gm sample with 25ml 10 NaOH solution at 140°C for 1 hour followed by filtration through whatman 40 residue washed with hot water containing 1 NaOH soln Aliquot taken from the filtrate and alumina estimated by complexometric back titration with std zinc solution using xylenol orange as

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