bauxite naoh pressure vessel

This is a pressure vessel so first off you need to select a construction code for pressure vessels Second if you select ASME BPV Code Section VIII Div 1 you will need to use pressure vessel quality carbon steel plate like SA 516 Grade 70 Alumina is obtained from bauxite by Bayer's process in this process bauxite powder is taken and concentrated (45%) sodium hydroxide solution is added and then heated in closed vessel at 433 K temperature and 5 to 6 bar pressure by hours by doing this aluminium oxide present in bauxite is converted into sodium aluminate which is soluble in

Bauxite

caustic soda NaOH sodium Usually bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution at a temperature of In the Bayer process sodium hydroxide is used in the refining of alumina containing ores (bauxite) to produce alumina (aluminium oxide) which is the raw material used to produce aluminium metal via the

Autogenous pressure in a closed vessel At 32% filling the water will expand to fill the autoclave at the critical temperature SiO2 0 5 M NaOH ZnO 6 M NaOH The solubility of the materials is not always sufficient at the synthesis for extracting high-grade aluminium hydroxide from bauxite ore Bauxite Mixture of Al(OH)3 and AlOOH

For Boehmite-Gibbsite mixed bauxite Double digestion Tube digestion and Two step digestion technology are adopted In my opinion Two-Step Digestion (Atmospheric followed by high pressure) Digestion shall be most efficient and economical for processing Gibbsite-Boehmite mixed Bauxite

Reactive silica is the most detrimental impurity in bauxite When bauxite is contacted with Bayer liquor reactive silica dissolves and then precipitates as a sodium aluminum silicate known as the desilication product (DSP) which is discarded along with the bauxite residue and maintained in long-term storage facilities DSP recycling using bauxite residue lime sinter-leach is prohibitively

made to suit a particular bauxite The processes are nevertheless basically similar and a general description is given in the following The bauxite from the mine is crushed and ground It is then mixed with a solution of caustic soda and pumped into large auto-claves There under pressure and at a temperature of 110–270C the alumina


BAYER PROCESS

In this step the bauxite slurry is pumped from the holding tanks to the autoclaves (digester vessels) where it is mixed with hot concentrated caustic soda liquor The digestion temperature and pressure depend on the mineralogical composition of the bauxite Most bauxitic ores are composed of gibbsite (Al(OH) 3 or AlO(OH)*H 2 O) boehmite (γ-

Autogenous pressure in a closed vessel At 32% filling the water will expand to fill the autoclave at the critical temperature SiO2 0 5 M NaOH ZnO 6 M NaOH The solubility of the materials is not always sufficient at the synthesis for extracting high-grade aluminium hydroxide from bauxite ore Bauxite Mixture of Al(OH)3 and AlOOH

Bauxite Ore Washing Technology In America We are a large-scale manufacturer specializing in producing various mining machines including different types of sand and gravel equipment milling equipment mineral processing equipment and building materials equipment

Different ways for alkaline recovery of aluminum from bauxite residue are considered from the literature and examined in experiments The advantages and disadvantages of a high-temperature digestion via Bayer process and soda-lime sintering process are elaborated and compared As a hybrid process bauxite residue undergoes a reductive smelting process with lime addition in an electric arc

Nov 12 2011Plate Thickness Calculations for Digesters and Other Pressure Vessels Hi Friends In earlier posts we have discussed in detail the process design and equipment design calculations for various technological equipment including pressure vessels used in Alumina refineries

Depending on the bauxite mineralogy this reaction begins at temperatures of approximately 143C and pressures of approximately 425 kPa These pressure temperature conditions require the use of a pressure vessel which in the aluminum industry are called "digesters " It is fitting that one of the first

CHAPTER 2 OVERVIEW OF HINDALCO AND ITS PROCESSES 2 1 Aluminium Overview The Aluminium industry is the largest non-ferrous industry in the world economy The production of the primary Aluminium from the Aluminium Oxide is power intensive process Aluminium is the third most abundant element on the earth's

A solution of bauxite residue NaOH and ferrous salt was heated to 100 'C for 1 30 3 00 4 30 and 6 00 hours under nitrogen The solid was filtered and dried at 60 in air Addition of metallic aluminum A mixture of 150 g of bauxite residue and 1-120 Pressure 50 and 100 bar Temperature 200 and 250 oc Metal ic aluminum varied from 3 to 10 g

Bauxite Crushers In South Africa

Bauxite Naoh Pressure Vessel Crushers And Grinders Used In Bauxite Processing Bauxite Refining Malaysia Crusher Used In Bauxite Mining Aluminum Ore Crusher For Bauxite Mining Processing In South Africa Run Of Mine Bauxite Ball Mill Principle For Bauxite Crushing Plant Bauxite Ore Dressing Processing Equipment Bauxite Crushing Particle Size

Mar 11 2019Bauxite ore contains 30-60% 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 by-product

Bayer process - WikiVisually Bauxite ore is a mixture of hydrated aluminium oxides and compounds of other elements such as iron In the Bayer process bauxite ore is heated in a pressure vessel along with a sodium hydroxide solution (caustic soda) at a temperature of 150 to 200 C

It is important to remember that a pressure Relief Valve is a safety device employed to protect pressure vessels or systems from catastrophic failure With this in mind the application of pressure Relief Valves should be assigned only to fully trained personnel and be in strict compliance with rules provided by the governing codes and standards

The pressure is not important for the process as such but is defined by the steam saturation pressure of the process At 240C the pressure is approximately 3 5 MPa The slurry is then cooled in a series of flash tanks to around 106C at atmospheric pressure and by flashing off steam This steam is used to preheat spent liquor

Mar 11 2019Bauxite ore contains 30-60% 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 by-product

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