Soluciones Ambientales Para la Minería
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Soluciones
Ambientales
Para la Minería
VALUE RECOVERY AND ENVIRONMENTALLY SUITABLE PROCESS FOR TREATING RESIDUES
FROM COPPER SMELTING AND REFINERY
EcoMetales Limited
Santiago, November 12th 2015
INDEX I. Copper Mining Industry Overview. II. Arsenic in the Copper Mining Industry. III. Sustainability and Environmental Restrictions. IV. EcoMetales Limited, value from hazardous waste. • Treating Arsenic and recovering copper • Complex Concentrates Leaching Project • EPAS Treatment Project V. Challenges, Business and Research opportunities. EcoMetales: Soluciones ambientales para la minería.
Copper Mining Industry Overview
Source: International Copper Study Group
EcoMetales: Soluciones ambientales para la minería.
Copper Mining Industry Overview
Country Concentrate Balance by 2018
Source: International Copper Study Group
EcoMetales: Soluciones ambientales para la minería.
Arsenic in the Copper Mining Industry
Copper grade (%)
Sulfides
Oxides
Arsenic grade (%)
Source: Codelco
EcoMetales: Soluciones ambientales para la minería.
Arsenic in the Copper Mining Industry
• As content in the worldwide Cucons
productions will growth from actual
5.000 ton/y to 150.000 ton/y at 2020.
• Increasing transport restrictions
reduce the trading options of this
“products”.
• Difficult to trade. Today we could
blend, but the arsenic limits (0,2%-
0,5%) in the blend, require huge
amount of clean Cucons.
Source: Wood Mackenzie Codelco VCO
EcoMetales: Soluciones ambientales para la minería.
Arsenic in the Copper Mining Industry
• The As processing capacity at smelters is
180.000
limited.
160.000
• The 66% of arsenic that enter into the 140.000
market, is in the complex concentrates,
120.000
which may not be processed in a
Arsenic (t)
traditional way in foundries. 100.000
80.000
• Need to take care of the increasing
60.000
proportion of complex concentrates
and to recover the valuable elements 40.000
that today are lost. 20.000
• As content in the worldwide Cucons 0
productions will growth from actual
5.000 ton/y to 150.000 ton/y at 2020. Arsenic content in concs Arsenic capacity in smelters
Source: Wood Mackenzie Codelco VCO
EcoMetales: Soluciones ambientales para la minería.
Arsenic distribution
Sulfuric Acid Plant Efluent Treatment
Plant
As Eflfuent: 35 % As in calcium
arsenite
Flotation
Tailings
30 % As in Dust
8% in Refinery
Gas Effluent
100 %
As in Cucons
Smelter Unit
Peirce Smith Anodes
Refinery Cathodes
Converter Casting Wheel As Anodes: 8%
24% As inSlag
EcoMetales: Soluciones ambientales para la minería.
Sustainability and Environmental Restrictions
Regulations: increasingly challenging for hazardous substances/mixtures/impurities
REACH Directive: Authorization/Restriction.
New and strict standards for Hazard assessment/communication to users.
CLP: Classification Label Packing
GHS: Globally Harmonized System
The marine transport context
IMO: International Maritime Organization
MARPOL Annex V: Harmful to the marine environment (HME) substances and treatment of residual waters.
International Maritime Solid Bulk Cargoes (IMSBC): New Materials hazardous only in bulk (MHB) hazard criteria.
Some National policies
< 0,5 % As content to China….
Sustainability and Environmental Restrictions
So far, we have:
A lot copper concentrate with valuable elements … With some Arsenic
That create a tiny fence for exports… “…just for environmental issues…”
If we could not export… and we know that the As content will increase
We must process this Cucons with As…
A “new trend”: smelters and (maybe) refinery nearby to ores
and now they must recover all the value… at least… everything
…And treat and dispose the residues…
Treated complex Cucons needs…
know how to treat arsenic and recover the valuable elements that are content in the CuconsArsenic distribution
Sulfuric Acid Plant Efluent Treatment
Plant
As Eflfuent: 35 % As in calcium
arsenite
Flotation
Tailings
30 % As in Dust
8% in Refinery
Gas Effluent
100 %
As in Cucons
Smelter Unit
Peirce Smith Anodes
Refinery Cathodes
Converter Casting Wheel As Anodes: 8%
24% As inSlag
EcoMetales: Soluciones ambientales para la minería.Arsenic distribution
Sulfuric Acid Plant Efluent Treatment
Plant
As Eflfuent: 35 %
Flotation
Tailings
30 % As in Dust
8% in Refinery
Gas Effluent
100 %
As in Cucons
Smelter Unit
Peirce Smith Anodes
Refinery Cathodes
Converter Casting Wheel As Anodes: 8%
24% As inSlag
EcoMetales: Soluciones ambientales para la minería.EcoMetales Limited, value from hazardous waste
● EcoMetales is a 100% subsidiary of CODELCO,
created for develop and implement
environmental solutions and metal recovery
processes in Codelco and mining industry.
● Our facilities are in a strategic location, 35 kms
northeast of Calama.
● Since 2007, EcoMetales has processed more
than 370.000 tones of residues recovering
72.000 tones of copper, and treat 10.200 tones
of Arsenic.
● We currently process residues from CODELCO’s
Divisions and are actively seeking opportunities
to collaborate with other mining companies.
EcoMetales: Soluciones ambientales para la minería.EcoMetales Limited, value from hazardous waste
Arsenic Stabilization Plant
• Inaugurated in 2012.
• Leaching plant capacity: 65.700 [ton/year] of copper smelter dust.
• EcoMetales has 164 permissions, of which 146 are environmentally related and the others are
relative to the operation, transportation, treatment and disposal of hazardous residues.
World’s biggest arsenic stabilization plant
EcoMetales: Soluciones ambientales para la minería.EcoMetales Limited, value from hazardous waste
Arsenic Disposal Techniques
• Scorodite process: used for solutions with high copper and arsenic contents such as Pregnant Leach
Solution (PLS) coming from previous leaching. The process generates a stable solid compound (TCLP1, [As]
< 2 ppm) which fulfils the requirements of the hazardous waste management regulations and a final PLS
with a arsenic concentration below 800 ppm.
• Arsenic trisulfide process: used in the effluents treatment from sulphuric acid plants. The process
consists in the arsenic precipitation by the addition of gaseous H2S or liquid NaHS. The precipitated
compound must be stored under hermetically sealed encapsulation (TCLP [As] < 13 ppm). The final acid
solution presents 1 ppm of arsenic.
• Calcium arsenate process: used in the effluents treatment from sulphuric acid plants. The process
involves the addition of limewater in order to precipitate arsenic generating an unstable solid compound
(TCLP [As] < 600 ppm) and a solution with 150 ppm of arsenic.
1TCLP: Toxicity characteristic leaching procedureEcoMetales Limited, value from hazardous waste
Patented Arsenic Stabilization Process
Refinery effluent
H2SO4
H2O
Clean
Flue dust PLS
PLS to
Flue Dust Arsenic stabilization SX-EW
Treatment
plant
Leaching residue
Scorodite
EcoMetales: Soluciones ambientales para la minería.EcoMetales Flue dust Leaching Plant (FLP)
Q= 170 - 200 t/d
[Cu]= 18 -22%
[As]= 9-18%
Hum= 2%
Q= 45 -60 m3/h
[Cu]= 15 - 25 g/L
[As]= 12 - 20 g/L
[H2SO4]= 50 g/L
Q= 30-50 t/d
[Cu]= 6 - 8%
[As]= 1- 3%
Hum=18-25%
EcoMetales: Soluciones ambientales para la minería.EcoMetales Arsenic Stabilization Plant (ASP)
Q= 45 -60 m3/h
[Cu]= 15 - 25 g/L
[As]= 12 - 20 g/L
[H2SO4]= 50 g/L
Q=80-85 m3/h
[Cu]=15-20 g/L
[As]=0,5 - 1 g/L
[H2SO4]=12-20 g/L
Q=190-240 t/d
[Cu]=0,5-0,8%
[As]=10-12%
Hum=20-25%
EcoMetales: Soluciones ambientales para la minería.Arsénico en Escorodita EcoMetales: Soluciones ambientales para la minería.
Complex Concentrates Leaching Project
• Client: DCH/DMH.
• Starting Feasibility Engineering.
• 200.000 ton CuCons/y capacity.
• Cu extraction of 98,5% at 2,5% As. 30 bar, 220°C.
• Flexible Operation: Processing Complex Concentrates,
Dust, calcine.
• Leaching residue comply with TCLP-SPLP test.
• Zero emission As and SO2.
EcoMetales: Soluciones ambientales para la minería.EPAS Treatment Project
• Client: DET.
• Ending Feasibility Engineering.
• As treatment as trisulfide (2000 As ton/y).
• Treated effluent reuse.
• 4 times residues reduction.
• Residue dispose on site in maxibags.
• TCLP [As] < 13 ppm
EcoMetales: Soluciones ambientales para la minería.Challenges, Business and Research opportunities
EcoMetales Limited
Flue dust and refinery effluent treatment,
División subsecuent arsenic stabilization.
División Chuquicamata
Effluent Treatment from IX plant.
Ministro Hales
Evaluation and operation support of CODELCO’s acid
treatment plant.
Roaster dust storage
Complex Concentrates Treatment Project
Borras and roaster dust treatment Process
Legend
Current Operations
Projects
Flue dust treatment (raw material)
División Arsenical residues´s safety disposal
División El Teniente Arsenic stabilization from acid plant effluent
Ventanas
Flue dust treatment and arsenic stabilization
EcoMetales: Soluciones ambientales para la minería.Challenges, Business and Research opportunities
Environmental Solutions and value recovery
• Patented Arsenic Stabilization Process.
• Recovery of Minor Elements (Ge, Bi, Sb, Ag, Pb) from Solids Residues and Effluents.
• Cu and Mo Recovery from acid solutions (AMD/ARD).
• Tailings ReTreatment/Recycling Process.
• Hazardous Residues Safety Disposal.
EcoMetales: Soluciones ambientales para la minería.We want to be a strategic
partner of the mining industry
in Chile and worldwide.
www.ecometales.cl
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