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8/7/2019 Senior Design Presentation Repaired]
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EMOVAL OF IMPURITIES THROUGH ALKALINE
ULPHIDE LEACHING
ENIOR DESIGN PROJEC IN PROCESS METALLURGY( )7007K
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BACKGROUND
• Exhaustingprimary metalreserves
• Growing interest foralternativesources; scraps,
slag, and slimes
• Decopperizedanode slimes
containsvaluables metals
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BACKGROUND CONT.......
• Impurity elements such as As, Sb, Bi,and Hg are the challenge.
•Difficult to remove from the metalliccopper
• A selective pre-treatment process for the
removal of these impurities isnecessary
• Reduced environmental problems and
simplified metallurgical processes.
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OBJECTIVES
• Screening of the factors affectingleaching of impurity (As, Sb,…) byalkaline sulfide
• To optimise the impurity(As,Sb, ..)removal from decopperized anode
slimes produced at Rönnskärcopper smelter.
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LITERATURE REVIEWCONT...
Decopperized anode slimes• Oxides and other compounds
deposited at the bottom of anelectrolytic cell during electro-
refining of copper.
• Contain significant amounts of Au,
Ag and variable Cu, Ni, Pb, As, Sb,Bi, Te and PG metals
• There are types of anode slimes
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A.LITERATURE REVIEWCONT...
• Slimes from concentrates - Au,Ag, Te and se.
• Slimes from scraps- Pb, Sn, andAg.
• Ag:Se< 1,7 - AgCuSe formed
• Ag:Se<1,7, - AgSe formed
• Pb present as PbSO4
• As, found in electrolyte as arsenic
acid
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CONT.....
Element % ‘ ’nto slimes % ntoelectrolyte
Cu < ,0 2 <99,8 Au 100 0 Ag <99 <1 Se 98 2 Te 98 2 Pb 98 2
Bi % , %60 with 0 1 Pb in anode 40
Sb % , % ,60 with 0 1 As,Bi Pband Sb
( )each in anode
40
Element
% nto‘ ’limes
% ntoelectrolyte
As % , %25 with 0 1
As in anode 75
S 1 99
Ni 1 99 Co 1 99
Fe 0 100Zn 0 100
:able 1
Impurities behavior during
- .Electro refining
LITERATURE REVIEW
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LITERATURE REVIEWCONT....
Pd/Pt SLIME
Se RECOVERY
CRUDE SELENIUM
SILVER 99,99%
GRANULES
GOLD 99,99%
INGOTS/GRANULESES
SMELT SLAG
TO COPPER
PLANT
COPPER TELLURIDE
NICKEL SULPHATE
ANODE SLIME
SOLUTION
TO THE
TANKHOUSE DRYING
KALDO SMELTING&
REFINING
CASTING OF ANODES
SILVER ELECTROLYSIS
GOLD REFINNING WCC
GOLD SLIME LEACHING
PRESSURE LEACHING
ecopperized anode slimes treatment
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CONT...
FERRIC ION,
H2SO4 AND
THIOUREA
Na2CO3 AND
CARBON
Pb-Sn
SOLDERING
ALLOY
SILVER METALCOPPER METAL
LEACHING
S/L SEPARATION
ELECTROLYSIS
LEACHING
S/L SEPARATION
ION EXCHANGE
SMELTING
ANODE SLIMES
H2SO4 AND O2
CA
KE
CA
KE
ecopperized anode slimes
treatment
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CONT...
BULLION
HCl LEACHING
Sb , As
Te, (Cu)
Cu, (Te )
Se
KOH LEACHING
ALKALINE ROASTING
WATER LEACHING AT ROOM
TEMPERATURE
H2SO4 LEACHING
SMELTING
ANODE SLIMES
ecopperized anode slimes
treatment
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CONT...
lkaline sulphide leaching theory
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CONT...
lkaline sulphide leaching
theory
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MATERIAL AND METHODS
Material:• Decopperized anode slimes from
Boliden Rönnskär smelter electro-refining cell.
Methods:
•
Particle size analysis: CILAS-1064 liquid equipment(1.5 g sampleweight used)
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MATERIAL AND METHODSCONT..
• Mineralogical characterisation: - XRD analysis
•
Statistical experimental design: -Rechtschaffner experimental
design method
•
Leaching experiments: - Mechanically stirred glass reactor,
auto-regulated heating system.
MATERIAL AND METHODS
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MATERIAL AND METHODSCONT..
Parameter Level 1 Level 2
Leaching tempera (oC) 60 100
Na2S
concentration(g/l)
100 200
Leaching time (hrs)4 24
Solids concent. (g/l) 50 200
NaOH Concentration(g/l)
( )20 constant
: :ab l e 1 P a r am e t e r s an d t h e ir l e v el s T a b l e 2
x p er i m en ta l d e s i g n m a tr ix
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MATERIAL AND METHODSCONT..
Figure :1 x p e r i m e n t a l s e t up
:a b l e 3 R a n d o m i z ed
x pe ri me nt al o rd er
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RESULTS AND DISCUSSION
igure 2 : Particle size distribution of the crushed.anode slime sample
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CONT..
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RESULTS AND DISCUSSIONCONT..
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FUTURE WORK
• Evaluation of chemical analysesresults
• Evaluation of XRD results
• Statistical optimization
• Completion of the report
•
Final presentation of the findings