Extracting metals from mine waste
Transcript of Extracting metals from mine waste
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Extracting metals from mine waste Three cases of Ni and Cu Tailings and Waste Rock
in Norway INGAR F. WALDER, MARGARET TINSLEY, ASHLYNNE
WINTON, AND RODRIGO EMBILE, JR. Kjeøy Research & Education Center, Norway
New Mexico Tech,
NM Tech – 27th-28th of March 2018
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OUTLINE
• LOCATION - BACKGROUND - SETTING • PURPOSE OF THE STUDY • METHODS • TESTS RESULTS • EXTRACTION POTENTIAL
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Tellnes deposit – Titania Mine • Ilmenite-norite in an anorthosite complex • Ilmenite extraction; Sulfide extraction biprod. • Pentlandite, millerite, pyrrhotite, chalcopyrite • 2 Mt/year tailings deposition (so far 30 years) • 200-250 ppm Ni conc. in tailings
Råna Layered Mafic Intrusive • Dunite – pyroxenite –norite • Massive to simi-massive ore bodies • Associated with the dunite layers • Pyrrhotite-pentlandite- chalcopyrite-
pyrite • Tailings 7-8 Mton; 200-300 ppm Ni • Waste rocks approx 0.5 Mton
Sulitjelma VMS Deposits • 20 dep.+ within an offiolite complex • Associated with greenstone layer • Cpy – Sph - Gal. in pyrite matix • Tailings 10-15 Mton • Waste rocks approx. unkn. amount
Kjeøy Research & Education Center
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PURPOSE
• Drainage water issues and geochemical processes within the waste material
• Leaching potential through column studies for metal extraction
• Practical research projects for Bachelor (2), Master (2) and PhD (1) students
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TELLNESVATNET
Water
WET TAILINGS
Tellnes Deposit Tailings Map
0.5 km
DRY TAILIINGS
Seepage
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SEEPAGE WATER Tailings dam
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SEEPAGE WATER Tailings dam
kg/day
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ANALYSIS
• Mineralogy (XRD-SEM) • ABA (acid–base accounting) • SCE (sequential chemical extraction) • Water analysis • Leach tests
• Humidity cell tests 3-7 months • Column Leach tests 2 months and going
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Column leach tests
• 6 kg sample • 1L leach solution/week • 7 months duration • Weekly analysis • Acidic process water • Deionized water
• 6 kg sample • 0.5 L/day leachate • +2 months duration • Analysis 1-3 days • Acidic process water • Sulphuric acid
Humid air pump
Leachate
2-3kg of Sample
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Column leach tests weekly rinse
23456789
0 50 100 150 200 250Time (days)
pH
"C16-Acid""C17-Norm"
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HCT- acid column
Days
ACID ACID WATER
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Leach columns
0.01.02.03.04.05.06.07.08.09.0
0 10 20 30 40 50 60 70
pH
Time (days)
pH
Sulfuric Acid
Process water
0
5
10
15
20
25
30
35
0 10 20 30 40 50 60 70
Ni m
g/l
Time (days)
Nickel
Sulfuric Acid
Process water
Ashlynne Winton, BS Earth and Environmental Dept.
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Leach columns
0.01.02.03.04.05.06.07.08.09.0
0 10 20 30 40 50 60 70
pH
Time (days)
pH
Sulfuric Acid
Process water
0
5
10
15
20
25
30
35
0 10 20 30 40 50 60 70
Ni m
g/l
Time (days)
Nickel
Sulfuric Acid
Process water
Ashlynne Winton, BS Earth and Environmental Dept.
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Leach Columns
0
5
10
15
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35
40
0 10 20 30 40 50 60 70
mg/
kg
Days
Nickel Extraction
Waste Water
Sulfuric Acid
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SULITJELMA TAILINGS and WASTE ROCKS
Allice Clark, BS Earth and Environmental Dept.
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pH – kinetic tests Waste rocks, Sulitjelma
Franciszka Stopa MS Mineral Engineering Dept.
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Copper – kinetic tests Waste rocks, Sulitjelma
Franciszka Stopa MS Mineral Engineering Dept.
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Potential for Nickel Leaching from the Bruvann Nickel-Olivine Deposit,
Northern Norway
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Acid and Alkaline Leach Columns Weakly Column leach tests • 1 L/week • 3-5 kg sample old waste rocks • 35 weeks
Continuous flow columns • Leachate collected continuously,
sampled in batches • about 5 kg sample • Leachate
– Leached with water (weekly), – pH 2.0 H2SO4, – pH 1.5 H2SO4, – either water or pH 12 NaOH.
Margaret Tinsley, MS Earth and Environmental Dept.
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Weakly DI water Columns
• Nickel has a smooth decline, remains at mg/L levels for months
• Moderately acidic
Margaret Tinsley, MS Earth and Environmental Dept.
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Water Acid Water Leach Results
• Long lasting neutralizing capability
• Lower pH temporarily increases leaching
• Returning to water leach yields a spike in nickel concentration, then a sharp drop.
Margaret Tinsley, MS Earth and Environmental Dept.
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CONCLUSIONS • Standard leaching methods feasible for Ni extraction
• Tellnes tailings as well as Råna waste rocks • Olivine content reduces the acid leachability by
effectively consuming hydrogen ions • Approx. 0.2 wt. Cu leached from waste rocks and
tailings at Sulitjelma. over two years, • Nickel extraction is feasible using the acidic process
water • Low pH increase the release of Nickel, but is not
effecting the mobility. • To get cobalt, and copper from the same ore require
a low pH solution.
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Further Student Research
Reno Cell www.efftech.co.uk
Active leaching copper of Mine Waste from Sulitjelma • Mineralogy work • Vat leaching, high oxygen flow Olivine leaching to improve Ni recovery • HVEP (patent pending) • Alkaline leach Vanadium extraction EU funded • Magnetite reaction rates • Preheating before leaching Extraction of metals from solution • Solvent extraction electro winning • Ion exchange
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Thank you
Any Questions
[email protected] funded by
KJEØY RESEARCH & EDUCATION CENTER, New Mexico Tech,
and Norwegian Science Foundation
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Weekly rinse - columns
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0.01
0.10
1.00
10.00
100.00
1000.00
0 50 100 150 200 250
pH
mg/
l
Tid (dager)
Tailings Leach, Fe
Acid - Fe Norm - Fe Acid - pH
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HCT – SCE (Dold, 2003)
0
50
100
150
200
250
1 2 3 4 5 6 7 8
Cons
. (pp
m)
"Norm Top" "Norm Bot." Acid Top Acid Bot.
Step
NICKEL total 260 ppm
Water NH4- Acetate NH4-oxalate NH4-Oxalate
H2O2 KCl+HCl+HNO3
Four acid dig.