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Dubai, 29 November to 1 December 2015ICSOBA

Authors (Arial 28 or 32 bold)

Affiliation (Arial 28 or 32)

Presented by: Presenter’s Name (Arial 28 or 32 bold)

TITLE OF PAPER (ALL CAPITALS, ARIAL 32 or 36 BOLD)

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Dubai, 29 November to 1 December 2015ICSOBA

Contents

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• YYY

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Dubai, 29 November to 1 December 2015ICSOBA

Introduction

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• Yyy– Aaa

– Bbb• Mmm

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– CCC

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Dubai, 29 November to 1 December 2015ICSOBA

Amperage Increase Strategy

Parameter Unit 420 kA 440 kA 450 kA Cell net voltage V 4.354 4.248 4.260 Anode-to-cathode distance (ACD)

cm

3.18

2.83

2.76

Anode cover thickness cm 10 14 8 Voltage to make aluminium (no contribution from C and CO burn)

V

2.088

2.088

2.088

Internal heat kW 802 786 806 Heat loss from anode assembly kW 330 329 374 Heat loss from cathode kW 472 457 432

The table shows main heat balance parameters:

• Reduction of voltage, ACD and cathode heat loss

• Increase of anode assembly heat loss

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• Due to good control on bath height there was rarely any rods rejected.

• Anode rod rejection an average percentage of 0.29 % for the period of 5 years, in which on average there were 10 rods rejected per year out of 2 593 roded anodes.

Bath Height Control and Anode Stubs

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The average iron concentration in metal for entire operational period was 0.04%.

• Low concentration of iron in metal was established as a result of:– Good operation practices in which anode problems were

reduced

– Good control of bath height

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Date

Fe

(%)

Cell 275Fe 0.214 %

Cell 273 Fe 0.241 %

Cell 276 Fe 0.215 %

Cell 273 Fe 0.347 %

Pot Operation: Metal Purity

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Conclusions