A new face drilling rig for narrow tunnels and ... - Advanced Mining

More documents

Recommendations

Info

direct energy usages, but indirect energy usage must also be considered. In direct energy would be the energy cost associated with grinding media. Many countries have already instituted cap and trade systems and carbon taxes with more to come. As political pressure increases to control carbon emissions, the cost of energy will continue to outpace inflation. Also, mining practices are generally viewed by the public as a hazard to the environment. Using energy efficient technology will not only decrease operating costs, but could also generate a more positive public opinion since the most energy efficient technology is being used. In August of 2009, the Mining Journal reported that the Australian government responded to the EIA (environmental impact assessment) with concerns over the potential green house gas emissions. Using Vertimill® technology may help project get the require environmental permits as people are more concerned about carbon emmissions. Economics of Secondary Grinding with Vertimills® If the entire grinding energy of a concentrator is considered, there is significantly more energy in grinding the whole stream than concentrate, so it would follow that there should be more Vertimills® in secondary than in regrind applications. But, as previously stated, the majority of Vertimills® are in regrinding applications. One of the reasons for this is that Vertimills® are most efficient in finer grinds, so naturally they will be applied first where they can achieve the greatest savings. Vertimills® are still a new concept to many operators that are used to ball mills and there remains resistance by some to adopt the new technology to Secondary applications. In the past, for many operations, power and media costs were relatively low but since they have increased, and are predicted to increase, faster than inflation, now is the time that Vertimills® will move into the larger grinding roles. Another reason for slow acceptance in whole stream grinding may have been the previous limitation in Vertimill® sizes. As the Vertimill® has developed, larger and larger sizes have been created. The first Vertimills® were installed in the mining industry, were only 450 HP (335 kW) and it took many years to increase the size up to 3000 HP (2240 kW), not because of mechanical limitations, but the quest for the site which would try the first to install the new size. However, for a large concentrator, multiple Vertimills would still be required. The Vertimill® has many other advantages beyond energy and media. It is a vastly simpler machine compared with a large ball mill which Issue 04 | 2010 TRANSFER OF TECHNOLOGY means that multiple Vertimills® are still less maintenance than a single ball mill - also the Vertimill® has superior wear characteristics and a greater operational safety. Many times, a multiple mill arrangement offers superior circuit operability and flexibility. Table 2 shows the assumptions for a sample calculation to determine the energy, media, and carbon savings of using Vertimills® in place of ball mills. Table 2: Assumptions Required Ball Mill Power 3333 kW VTM Efficiency 70 % Required Vertimill® Power 2333 kW Power Cost 0,5 /kWh Circuit Availability 93 % Ball Mill Media Consumption 0,065 kg/kWh Vertimill® Media Consumption 0,05 kg/kWh Delivered Media Cost 1150 $/mt Annual Power Cost Increase 4 % Annual Media Cost Increase 4 % Carbon Dioxide Emissions 0,609 kg/kWh Energy in Media 6 kWh/kg Internal Rate of Return 8 % Table 3: Vertimill® savings Year Energy Savings Media Savings Carbon Savings (mt of CO2) 1 $ 407,340 $ 936,882 7,938 2 $ 423,634 $ 974,357 7,938 3 $ 440,579 $ 1,013,332 7,938 4 $ 458,202 $ 1,053,865 7,938 5 $ 476,530 $ 1,096,019 7,938 6 $ 495,591 $ 1,139,860 7,938 7 $ 515,415 $ 1,185,455 7,938 8 $ 536,032 $ 1,232,873 7,938 9 $ 557,473 $ 1,282,188 7,938 10 $ 579,772 $ 1,333,475 7,938 NPV $ 3,201,290 $ 7,362,967 79,382 www.advanced-mining.com 104
The Develeopment of Vertimill US$0.05/kWh is a typical number for a conveniently located concentrator. There are many more remote locations some with energy costs as high as US$0.20/kWh which would make the selection of Vertimills even more favorable. The cost of the media is not simply the cost of the steel balls, but the delivered cost. Therefore, more remote locations will have much higher media cost, some as high as US$2000/mt; so US$1150/mt is again a conservative figure. It is estiamted that each kg of steel requires an average 6 kWh of energy (Pokrajcic and Morrison, 2008). The United States Department of Energy determined that for every kWh of power generated in the US, the average Carbon Dioxide emission is 1.341 lbs or .609 kg (DOE, 2002). Issue 04 | 2010 The MetsoVertimill® TRANSFER OF TECHNOLOGY Table 3 shows the savings in energy and media cost, and carbon dioxide emissions for 1MW of power. The total NPV savings of energy and media over a ten year mine life of 1 MW of grinding energy by using Vertimills® instead of ball mills is approximately US$10 million. The carbon savings are approximatly 80,000 tonnes. These figure are scaleable, and can be used for a quick calculation of potential operational savings in a large concentrator. Consider a 100,000 mtpd copper concentrator that would have approximately 40 MW of ball mill power. Vertimills® could make the same grind at 30% less energy or 28 MW. 12 MW of energy would be saved, and using the figures caclulated above, that would equate to US$120 million savings in energy and media costs and 960,000 tonnes of carbon. The Vertimill® is a proven technology that offers considerable savings in media and energy operating costs that will lower the cost of producing copper significantly. Also, the environmental impact of a copper concentrator is significantly decreased. In the future, it is extremely likely that more sites will adopt this technology for more of their grinding needs to improve their profitability. Bibliography [1] Pokrajcic, Z, and Morrison, R, 2008, “Evaluation by Simulation of Grinding Circuit Options to improve Eco-Efficiency” MEI Commmunition 2008, Falmouth, UK. [2] Pena, R.F., Update “VERTIMILLS® for the Mining Industry” Vina del Mar, Chile, November 1990. [3] Pena, R.F., Lawruk, W.A., and Jones, S.M., “The Versatile Tower Mill—A Recent Application”, 1985 Intermountain A.I.M.E., Vail, Colorado. [4] Brissette, M, “Millpebs: Energy Savings in Fine Grinding Mining Applications”, MEI Comminution 2008, Falmouth, UK FOR MORE INFORMATION AND CONTACT: Metso Minerals Adservice Press service Ralf Goffin Tel.: +49 (0)24 32 - 89 08 090 eMail: presseservice@adservice-web.de Vice President Project Proposals EMEA Sven Hörschkes Tel.: +49 (0)621 - 72 70 05 10 eMail: sven.hoerschkes@metso.com Internet: www.metsominerals.com www.advanced-mining.com 105
Page 1 and 2:
www.advanced-mining.com 04 2010 ADV
Page 3 and 4:
EDUCATION NEWS & REPORTS alljig ®
Page 5 and 6:
Pic. 1: Multi-phase system of the s
Page 7 and 8:
HYDROMETER ANALYSIS The hydrometer
Page 9 and 10:
EDUCATION Pic. 7: Interpretation of
Page 11 and 12:
Hereby the dry solids md are determ
Page 13 and 14:
Issue 04 | 2010 TRANSFER OF TECHNOL
Page 15 and 16:
Basics of Market Review and Require
Page 17 and 18:
• Layout an Operation Time: Based
Page 19 and 20:
Pic. 2: Technical basic parameters
Page 21 and 22:
Issue 04 | 2010 Pic. 5: 3 D visuali
Page 23 and 24:
Pic. 6: Treatment diagram of proces
Page 25 and 26:
[5] Kirschbaum, Martin (1991):Grund
Page 27 and 28:
Page 29 and 30:
Going underground Experts have been
Page 31 and 32:
The future All work was successfull
Page 33 and 34:
Pic. 2: Schematic tribological syst
Page 35 and 36:
Experimental Study In highly abrasi
Page 37 and 38:
Results The results of the test acc
Page 39 and 40:
Abtrag in mm³ 18 16 14 12 10 8 6 4
Page 41 and 42:
Bibliography [1] Uetz, H.: Abrasion
Page 43 and 44:
Page 45 and 46:
the classical mechanics through a f
Page 47 and 48:
Hereby ζ is the coefficient of vel
Page 49 and 50:
Characteristic data like active cur
Page 51 and 52:
The calculation method delivers the
Page 53 and 54: The values listed in table 5 are va
Page 55 and 56: Like in the coefficient of velocity
Page 57 and 58: Prof. Dr.-Ing. Dipl.-Wi.-Ing. W. A.
Page 59 and 60: Global ressources, reserves and pro
Page 61 and 62: Terms of Trade The three biggest pr
Page 63 and 64: The single wattmeter method (single
Page 65 and 66: Results of the measurement Fig. 12
Page 67 and 68: Bibliography [1] INTERNATIONAL ENER
Page 69 and 70: Sound power P Sound power P is the
Page 71 and 72: Table 1: Speed of sound of differen
Page 73 and 74: Definition of the most important so
Page 75 and 76: Now, it is enabled the sound power
Page 77 and 78: Table 6: Example of admissible soun
Page 79 and 80: Table 7: Example of admissible soun
Page 81 and 82: In the sound spectrum of constructi
Page 83 and 84: Table 8: Time change of the third-o
Page 85 and 86: • Surfaces not directly into cont
Page 87 and 88: Table 11: Slewing crane - Sum sound
Page 89 and 90: Issue 04 | 2010 Fig. 24: Comparison
Page 91 and 92: Fig. 32: Low-noise fan Issue 04 | 2
Page 93 and 94: • Sound protection by terrain top
Page 95 and 96: Issue 04 | 2010 Zielitz potash mine
Page 97 and 98: HBR 201 electrohydraulic drilling m
Page 99 and 100: a Hütte type HBR 201 universal dri
Page 101 and 102: Introduction The Vertimill® is a u
Page 103: while tumbling. In a Vertimill® th
Page 107 and 108: Issue 04 | 2010 NEWS & REPORTS THE
Page 109 and 110: Moreover, the impact of the crusher
Page 111 and 112: at l a s Co p C o Un d e r g ro U n
Page 113 and 114: at l a s Co p C o Un d e r g ro U n
Page 115 and 116: BaCkers Ma s C h i n e n B a U gM B
Page 117 and 118: al lMineral aUfBereitUngsteChnik gM
Page 119 and 120: al lMineral aUfBereitUngsteChnik gM
Page 121 and 122: CONTITECH Issue 04 | 2010 NEWS & RE
Page 123 and 124: not limited by the size of gearbox
Page 125 and 126: haver & BoeCker w i r e weaving a n
Page 127 and 128: The consistently positive reactions
Page 129 and 130: Issue 04 | 2010 NEWS & REPORTS Spea
Page 131 and 132: partners up to tailor made special
Page 133 and 134: Kiesel: Hitachi wheel loader ZW550
Page 135 and 136: Three heavy chain dredgers, a big w
Page 137 and 138: concrete crusher, demolition and so
Page 139 and 140: across an area of 125,000 square me
Page 141 and 142: Following the live demonstrations,
Page 143 and 144: Also new in the 390D L‘s implemen
Page 145 and 146: Specification Comparison 390d L / 3
Page 147 and 148: The tunnel contractor consortium Co
Page 149 and 150: 2011 THE AMS-EVENT CALENDER Issue 0
Page 151 and 152: Issue 04 | 2010 EVENTS STEINExPO 20
Page 153 and 154: Issue 04 | 2010 EVENTS FOR MORE INF
Page 155 and 156:
Rohstoffversorgungstechnik Rohstoff
Page 157 and 158:
Issue 04 | 2010 FAchtAgUng Kies, Sa
Page 159:
PUBLISHING COMPANY AMS Online GmbH
show all

A new face drilling rig for narrow tunnels and ... - Advanced Mining

Create successful ePaper yourself

Delete template?

Save as template?