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Pressure Leach Approach Roast – Leach Approach

Concentrate

Pressure Leach

Iron

Concentrate

Roast

Leach

 Acid Plant

Sulphuric Acid

SO2Dross

Dross

Return

electrolyte

Leach residue

+ Sulphur 

Purify

Electrowin

Castin

!inc dust

Sla" #inc

Li$estone%arosite residue

Dross to roastin

or leachin

Return electrolyte

to leachin

Electrolyte

Iron

Re$o&al residue

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' Concentrate feed Pressure leach Roast leach

Che$ical analysis () "y weiht* dry "asis

!n ,-./ ,-./

0e '1. '1.S ,.- ,.-

Cu '.- '.-

3 /./', /./',

Cl /.//4 /.//4

Cd /.'- /.'-

5oisture () "y weiht* dry "asis 1./ 1./

Particle si#e ) 6,, 7 1./ 1./

2 O&erall reco&eries ()

!n 8-./ 8-./

Cu 1/./ 4-./

Cd 8/./ 8/./

Operatin ti$e (days9year

, Leachin

Operatin pressure (:pa ;// ('// psi /

Retention ti$e ($in '2/ 2'/ plus 2'//

in C '-/ 8/

O?yen utili#ation () 8/

32SO,9!n $olar ratio '.'

- Electrowinnin

Current density (A9$2 1-/ 1-/

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0irst stae or 

neutral leach

Li@uid6solid

separation

Li@uid6solid

separation

Second stae

or acid leach

0inal residue

(8; – 88) !n e?traction

Return electrolyte

(-/ 9l !n* '-/ 9l 32SO,

Partly reacted

solutionPartly reacted

solids

('- 9l !n* './ 9l 32

SO,

* /.- 9l 0e

0inal solutionConcentrate

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In this '8.,//6al autocla&e* sulphuric acid at 2-/C and 1// psi leaches latente

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=his ,1/ al autocla&e operates at 22/C and ,-/ psi

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 A '1.1// al autocla&e for precipitation of sulphides whith hydroen

sulphide

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=his ,./// al autocla&e operates at 22- psi for o?idation leachin of Bi6Co

$attes

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Rotary autocla&e for leachin tunsten and $oly"denu$ concentrates

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=u"e autocla&e asse$"ly (elfeldt '814

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Diara$ of colu$n autocla&e syste$