High-Power Drives for Energy Efficiency and Abatement of Carbon Emissions in Mineral Processing
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1 High-Power Drives for Energy Efficiency and Abatement of Carbon Emissions in Mineral Processing Prof. Jorge Pontt, IEEE S.M. Department of Electronics, Universidad Tecnica Federico Santa María-Chile Director MilleniumNucleus Industrial Electronics, Mechatronics and Process Control - NEIM jorge.pontt@usm.cl
2 Contents Introduction Mineral Processing Background Performance and Energy Efficiency-Cases Mine HaulTrucks SAG millwithgmd Rectifier Syst. for Electrowinning Conclusions
3 Miningin Chile World Ranking Product Chile 2008 % World Production 1ª Copper 5365 MTMF 34% 1ª Nitrates MTM 100% 1ª Litium TM 62% 1ª Iodine TM 60% 1ª Molybdenum TMF 15% 5ª Silver TMF 7% Ref.: Alvaro Lacoste, Gerente Estudios SONAMI, Situación y perspectivas de la minería en Chile, Agosto, 2009.
4 ProcessTechnologies a) Conventional(Sulphides Ore, chalcopyrite) Tailing Dryer Concentrate Mine Crushing Grinding Flotation Smelting Refining Fine Cu b) Leaching-Solvent Extraction-Electro-winning(Oxides Ore and secondary sulfides) Mine Crushing Leaching Solvent Extraction Electro- Winning Fine Cu Obs. No tailings, No Grinding, No Smelting.
5 Introduction: Investmentsin Mining, Chile NewSX New Concentrators Source: COCHILCO
6 Challenge: Improve Copper Mining for Sulphides Ore Concentrate Tailing Dryer Mine Crushing Grinding Flotation Smelting Comminution (size reduction) -Depends on hardness of ore Refining Fine Cu -Use high-power equipment -Highenergyuse: 65% -Steel use -Grinding balls -Liners -Safety and Reliability issues Interdisciplinary work: Electrical Eng. Mechanical Eng. Process Eng. Safety+Reliability, Risk Management
7 MINING AND EMISSIONS Directemissionsare causedby fuel (Diesel) consum. Indirectemissionsare causedby electricalenergyuse. 1 MWH causes emissionsofca Ton CO 2 e 1 tmfneeds 3.7 MWH/tmfofCopper
8 Loading
9 Transport
10 Grinding
11 Smelting
12 Case 1: Mine HaulTrucks CAT Model 795F AC, The 345-ton (313-tonnecapacity) 795F AC, 3400 Hp (Electric) CAT Model 797B 4000Hp 400 ton (345-tonne) capacity 797B Komatsu 960E 360 t (327 Tonnes) Dieselelectric
13 Komatsu 960E 360 t (327 Tonnes) Diesel-electric
14 CAT Model795F AC, 345-ton (313-tonne-capacity) 3400 Hp(Diesel - Electric)
15 Fig.1. Block diagram of the dieselelectric haul truck drive system Improvements: Better efficiency of Diesel engine and less lubricants Possible automated autonomus operation Enhanced lower emissions, 5-20% biodiesel
16 Case 2: SemiautogenousGrinding Circuit (SAG) with Gearless Mill Drive About65% energyisusedin comminution(sizereduction)
17 Gearless Mill Drives applied for Grinding in the Region
18 Fig.2. High-power gearless drive for a SAG mill
19 Fig.3 Typical Semiautogenous(SAG) Circuit A huge amount of mineral and slurry must be handled
20 Fig. 4. Positioning alternatives of the load cataract in a mill Problem: How to control: The internal charge motion The axial load transport
21 Systemequations
22 Fig. 5. MONSAG for a GMD
23 Fig.6. Improvement in Mill filling measurement. Comparison using bearing pressures and MONSAG
24 Fig.7. Improvement in throughput employing MONSAG instead of bearing pressures
25 Fig. 8. Improvement in specific energy consumption
26 Fig. 9. Measured (inspections) v/s estimated load filling Measured Filling, % Estim ated filling, %
27 Improvements -Application in a SAG circuit of tpd (36000 tpd) with a GMD Hp, 36x17 feet Mill -Production average was improved by about 3.2% and - Specific energy consumption (kwh/ton) was improved by 3.8%. - In addition it gives to the operator an early warning for filling levels over- and under the expected values.
28 Case 3: Avoiding Broken liners
29 Different pieces of liners, lifters, plates, pulp lifters, grates, etc.
30 Broken liners caused by steel-to-steel impacts
31 Hammered liners, The Problem: -A too high speed of rotation, the more harmful impacts steel-to-steel. -A too low speed of rotation, the lower the comminution inside the mill
32 Solution: ImpactmerSystem. Array of sensors around the mill to detect aggressive conditions to liners
33 Case 4: Power System- Power Quality- EMC issues Fig.11 High-power rectifier for Electrowinning of copper
34 Fig.11 High-power rectifier for Electrowinning of copper
35 Fig.12 Voltages at the busbars1, 3 and 5 of network fig. 11
36 Summary Mine Haul Truck (Diesel electric): Better efficiency of Diesel Engine Less Lubricants Better maintenance Possible automated autonomus operation Use of 5-20% biodiesel With 5-20% reduction of direct emissions
37 Summary SAG mill: A saving of 0,36 kwh/ton, beneficiation of tons/year it represents a saving of 4494 MWh/year, with an emission factor of 0,95 Tons CO 2 /MWH, the impact is a saving of ca. 4269Tons CO 2 /year. SAG mill: In addition, reliability, process stability and optimization may be enhanced with improved knowledge, design, procedures and smart instrumentation.
38 Summary
39 Conclusions Large scale operations for mineral processing needs the most powerful equipment. SAG mills depends strongly on the stability of the controlled movement of charge. Need of new concepts for productivity, energy efficiency and carbon emissions. Reliability means less downtimes and less man-hours working in the harsh industrial environment, contributing to safety.
40 Applied R&D Improvements Process energy efficiency and emissions. -Engineering Design -Operation& Maintenance -Networking and Int l collaboration -Ackowledgementsto our partners
41 Universidad Técnica Federico Santa María Millennium Nucleus Industrial Electronics, Mechatronics and Process Control Center for Automation and Supervision for Mining industry Thank you!
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