8/7/2019 3 Leaching Methods, Equipment, Engineering

1/22

PRESSUREHYDROMETALLURGY

3 Methods & Equ ipment

PRESSUREPRESSUREHYDROMETALLURGYHYDROMETALLURGY

33 Methods & EquipmentMethods & Equipment

Fathi HabashiFathi Habashi

Department of Mining, Metallurgical, and Materials EngineeringDepartment of Mining, Metallurgical, and Materials Engineering

Laval University, QuebecLaval University, Quebec City,,CanadaCity,,Canada

Fathi.Habashi@arul.ulaval.caFathi.Habashi@arul.ulaval.ca

Leaching Methods & EquipmentLeaching Methods & Equipment

8/7/2019 3 Leaching Methods, Equipment, Engineering

2/22

Pressure Leac hingPressure Leac hing

In absence of air or oxygen.

In presence of air or oxygen.

Autoc lavesAutoc laves

11 -- VerticalVertical

Pneumatic agitationPneumatic agitation

Shield

Pulpdischargetube

Opening forsteam inlet

Opening forsteam exit

Opening for

pressure gauge

Opening forpulp inlet

8/7/2019 3 Leaching Methods, Equipment, Engineering

3/22

Autoc lavesAutoc laves

22-- VerticalVertical

Pneumatic agitationPneumatic agitation

PulpPulp input

Level indicator

Air and H2SO4

Steam

discharge

Autoc lavesAutoc laves

33 VerticalVertical

Mechanically agitatedMechanically agitated

Acid

Manhole

Outlet

Overflow

Inlet

Oxygen

Rubber

lining

Drain

8/7/2019 3 Leaching Methods, Equipment, Engineering

4/22

Autoc lavesAutoc laves11 -- Hor izontalHor izontal

Autoc lavesAutoc laves22 -- Hor izontalHor izontal

8/7/2019 3 Leaching Methods, Equipment, Engineering

5/22

AutoclavesAutoclaves33 -- HorizontalHorizontal

Autoc lavesAutoc laves44 -- Hor izontalHor izontal

8/7/2019 3 Leaching Methods, Equipment, Engineering

6/22

Autoc lavesAutoc laves55 Hor izontal / rotat ingHor izontal / rotat ing

Autoc lavesAutoc laves66 Hor izontal / rotat ingHor izontal / rotat ing

8/7/2019 3 Leaching Methods, Equipment, Engineering

7/22

Autoc lavesAutoc laves11 Spher ical / rotat ingSpher ical / rotat ing

Autoc lavesAutoc laves22 Spher ical / rotat ingSpher ical / rot at ing

8/7/2019 3 Leaching Methods, Equipment, Engineering

8/22

AutoclavesAutoclaves33 Spherical / rotatingSpherical / rotating

Autoc lavesAutoc laves11 Pipel inePipel ine

8/7/2019 3 Leaching Methods, Equipment, Engineering

9/22

Autoc lavesAutoc laves22 Pipel inePipel ine

Autoc lavesAutoc laves33 Pipel inePipel ine

Flash tanks

Steam/Salt

CondensateOutlet

Heat exchanger

Preheater

8/7/2019 3 Leaching Methods, Equipment, Engineering

10/22

ENGINEERING ASPECTS

Engineering Aspects5 a High pressure membrane pump

8/7/2019 3 Leaching Methods, Equipment, Engineering

11/22

Engineering Aspects

5 b High pressure

membrane pump

Engineering Aspects6 Heat exchangers

Shell

TubesTube sheet

Shell inlet

Shell outlet

Outlet

Inlet

8/7/2019 3 Leaching Methods, Equipment, Engineering

12/22

Engineering Aspects7 Heat exchangers

Heat Exchanger 8

8/7/2019 3 Leaching Methods, Equipment, Engineering

13/22

EngineeringAspects

7 a Evaporators

Vaporoutlet

Solutioninlet

Vent

Condensate

Steam

Concentratedsolution outlet

EngineeringAspects

7 b Evaporators

Condenser

Cooling

water

Air exit

760 Torr

100 C

450 Torr

86 C

200 Torr

66 C

Steam

Condensateoutlet

Solution

intlet

Preheater

8/7/2019 3 Leaching Methods, Equipment, Engineering

14/22

EngineeringAspects8 Water jet venturi

Inspectionopening

Discharge of waterand condensate

Vapor inlet

Spraycondensing

vapors

Waterinlet

Jetvacuumpump

Waterinlet

Spray DryingMgCl2.6H2OMgCl2 + 6 H2O

8/7/2019 3 Leaching Methods, Equipment, Engineering

15/22

OxyhydrolysisOxyhydrolysis

Oxyhydrolysis Reactor

8/7/2019 3 Leaching Methods, Equipment, Engineering

16/22

Pressure Leaching Plant

Engineering Aspects9 a Flash evaporators Steam

Hot slurry

Slurryoutlet

Slurryoutlet

Protectionbaffles

Hotlurry

intlet

Steamoutlet

separator

8/7/2019 3 Leaching Methods, Equipment, Engineering

17/22

Engineering Aspects9 b Flash evaporators

Engineering Aspects9 c Flash evaporators

8/7/2019 3 Leaching Methods, Equipment, Engineering

18/22

Engineering Aspects

10 Slurry preheater

Engineering Aspects11 a - Thickeners

Underflow

outlet

Rake

drive

Liquor level

Feedwell

Rake arm

with blades

Feed

Overflow

8/7/2019 3 Leaching Methods, Equipment, Engineering

19/22

Engineering Aspects11 b - Thickeners

Engineering Aspects12 Fil trat ion & washing

Reagent

Water

Leaching

Filtration &washing

Solution

Concentrate

Residue

Wet

Disposal site

8/7/2019 3 Leaching Methods, Equipment, Engineering

20/222

Engineering Aspects13 - Thickeners

or calcineConcentrate

Reagent

Leaching

Filtration

Repulping

Solution

Thickener

Thickener

Thickener

Counter-current

washing

Thickslurry

Disposal pond

Water

Water

Engineering Aspects14 - Thickeners

Low gradeore

Reagent

Leaching

Sand filter

Thickener

Thickener

Thickener

Counter-currentwashing

Thickslurry

Disposal pond

Water

Solution

Thickener

8/7/2019 3 Leaching Methods, Equipment, Engineering

21/222

Engineering Aspects15 aBleed solution

Generating and recycling of leachingGenerating and recycling of leaching

agent during metal recovery, e.g.,agent during metal recovery, e.g., sulfuricsulfuric

acid duringacid during electrowinningelectrowinning of copperof copper

Bleeding to maintain the impurity level inBleeding to maintain the impurity level in

a leaching circuita leaching circuit

Engineering Aspects15b B leed solutionLeachingagent

Leaching

Filtration

Ore

RecoveryBleed

ResidueRecycle

Metal

8/7/2019 3 Leaching Methods, Equipment, Engineering

22/22

Engineering Aspects16 Plant layout [gold]

Engineering Aspects17 Plant layout [gold]