Bauxite Process Polys i Us

8/13/2019 Bauxite Process Polys i Us

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A new process for refractory grade bauxiteproduction

Dr.Christo h Be er, Pol sius AG

A new process for refractory grade bauxite production

Dr.Christoph Beyer, Polysius AG



A new process for refractory grade bauxite

production

- Introduction

- Technical concept and background

- The approach towards a BSD > 3,4 g/cm

- Summary and outlook


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- Introduction






Corporate structure

12/09

ThyssenKruppAGSales 08/09 Employees 30.09.09 40.6 bn (consol idated) 187,495

SteelAmerica

s

SteelEurope

ServicesElevatorStainlessInternational

MaterialsServices

ElevatorTechnology

PlantTechnolog

y

ComponentsTechnology

MarineSystems

Uhde

Polysius

Frdertechnik

SystemEngineering

Transrapid

Business Areas

Div ision Materials Div ision Technologies


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The High Temperature Pressurized Shaft Kiln

- The pressurized shaft kiln has been invented by the RCE inRadenthein / Austria in the Mid-1970s.

- The first application, a 50tpd kiln is s till in operation todayfor the production of Alumina-Spinel.

- Around 50 installations worldwide




production

- Introduction





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Product discharge

Cooling circuit

Fuel

Cooling air

Off-gas

FeedThe Pressurized

High TemperatureShaft Kiln



- Low energy consumption compared to other kilntypes for s intering

- High flexibility due to variable number of burnersand burner levels

- High and homogeneous product quality by even

heat distribution due to multiple burner lances

- Highest burning temperature (> 2200C ) due to

counter current operation

The Pressurized

High Temperature Shaft Kiln


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- Suitable for calcining, sintering and direct burning

- Particle size in the range of 10-100mm

- Maximum daily capacity up to 300 tpd

The PressurizedHigh Temperature Shaft Kiln



The Pressurized Shaft Kiln Applications and

references

-Around 50 kiln installations worldwide

-Applications and references:

- Magnesite- Dolomite

- Limestone- Alumina- Bauxite

- Misc. Spinels- Misc. refractory raw materials


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The Pressurized Shaft Kiln



The Pressurized

Shaft Kiln


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The Pressurized Shaft Kiln Technical concept



The Pressurized Shaft Kiln technical concept

Burnersystem


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The Pressurized Shaft Kiln-Kiln Shell



The Pressurized shaft kiln Inside view of refractories


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The Pressurized shaft kiln Inside view of refractories



The Pressurized Shaft Kiln - Discharge


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Specific pelletising technology for aluminaprocesses

Pelletising drums



The Pressurized Shaft Kiln specific pelletising

technology for alumina processes


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Application of the Pressurized Shaft Kiln for thethermal processing of Alumina and Bauxite

Advantages as mentioned by Bill McCracken:

- Lower capital investment costs

- Less fuel consumption

- Lower maintenance costs

- Longer lasting refractory lining

- Less required plant area

- Precise control of burning temperature

- Higher BSD

- Less waste emission

move out of thestone age and use

vertical

pressurised shaftkilns




production

- Introduction





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Agglomeration

Three options have been considered:

-Extrusion

-Pelletising

-Briquetting



Agglomeration

Extrusion:


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Pre-Processing and Grinding

The Polysius part of the processing startedafter the material went through the processsteps

-Crushing-Washing

-Drying-Magnetic seperationwith fine-grinding material to a d90=32m

on a Polysius Roller Mill.



Agglomeration

Pelletising:


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Agglomeration

Briquetting:

BSD > 3,4 g/cm, high s trength and stability



Industrial-scale sintering trial



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Industrial-scale sintering trial




Briquetting and sintering plant First Bauxite




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Thank you for your attention!

Documents

Bauxite Process Polys i Us