Annual Meeting Preliminary Program - Full Brochure (PDF) - SME

TECHNICAL PROGRAM
11:05 AM
A Social Development Project: Meerschaum Mining and Processing
Activities in Eskisehir
M. Yavuz; Mining Engineering, Eskisehir Osmangazi University,
Eskisehir, Turkey
Sepiolite [Mg4Si6O15(OH)2.6H2O] is widely used in industry because of its adsorptive,
rheological and catalytic properties. There are two genetic types of sepiolite
around the Eskisehir, Turkey. The most common type is the so-called
Meerschaum which occurs as nodules and concretions in Miocene-Pliocene conglomerate
surrounding the magnesite deposits around Eskisehir. Meerschaum
mining has been doing for centuries by local farmers two different region of
Eskisehir. Traditional tunneling methods are used in production activities by
local farmers. The produced raw meerschaum is processed by many artists in
Eskisehir. The best nodules are carved into objects such as pipe bowls, bracelets
and necklaces. In recent years, various problems are encountered both processing
and mining in sepiolite. Primarily, meerschaum production dramatically decreased.
For this reason, artists cannot find quality meerschaum. So, domestic
and external demand for processed meerschaum cannot provide by artists. In this
paper, the studies for solving the problems are described. The solutions for meerschaum
sector both production and processing processes have been developed.
Mineral & Metallurgical Processing:
comminution I
9:00 AM • Tuesday, February 26
chairs: E. Spiller, Tetra Tech, Aurora, CO
M. Jorgensen, CH2MHill, Centennial, CO
9:00 AM
Introductions
9:05 AM
A Modified Bond Abrasion-Index Machine Acoustic and Torque
Spectra Correlated to Ore-Induced Metal-Wear Characteristics
M. Uceda 1 , J. Seidel 2 , G. Martins 3 and P. Taylor 3 ; 1 Jacobs
Engineering, Golden, CO; 2 Newmont Mining Corporation,
Englewood, CO and 3 Colorado School of Mines, Golden, CO
The two principal operating costs in commercial crushing and grinding are energy
and metal wear. It is established that estimation of metal-wear costs during
process development studies is problematic. The Bond Abrasion Index determined
by the Bond Abrasion Test is employed in the mining industry as a tool to
predict metal consumption. The goals of this research were to improve reliability
of the prediction of metal consumption by incorporating acoustic emission and
torque-transducer instrumentation into the design of the abrasion machine.
Three ores sized to æ + Ω inch with varying grinding characteristics were employed
in the investigation. Fast Fourier Transform was performed on the fluctuating
acoustic and torque signals to obtain ore-related characteristic “signatures”
in the frequency domain. In addition, the mass of the paddle (wear element) was
measured as a function of time and a non-linear correlation was obtained that described
the wear-characteristic of the paddle for each ore. The results reported
represent a significant contribution to the interpretation and consequently the
confidence-level of the Bond Abrasion Test.
control system. Each action above would serve to make the crusher more productive
and more energy efficient, and would also have mechanical benefits for
the machine.
9:45 AM
New Generation of Gearless Mill Drive – When High Efficiency
Meets High Availability
R. Errath 1 , A. Fuerst 1 and L. Arana 2 ; 1 Minerals, ABB, Baden,
Switzerland and 2 Newmont / Yanacocha, Cajamarca, Peru
When in 2006 at the SME conference ABB presented the paper Gearless Mill
Drive the working horse for SAG and Ball mills a very experienced mining engineer
were really impressed about the efficiency of 95% but he asked about the
availability of the drive system and the entire plant? Remember: Availability
stands for production and efficiency for energy cost! Since then ABB has modified
and improved many design details related to the motor. In parallel a smart
control system has been developed which is able to check motor condition long
before some problem could occur. This new generation of Gearless Mill drives
definitely needs less maintenance, however the key for high availability also remains
in the hands of the plant maintenance staff. The paper shows what kind of
improvements have been made on the motor and which steps forward in smart
controlling have been achieved. It also shows what kind of approach, coordination
and activities of the plant maintenance staff is applying to get an availability
of more than 99% on the Gearless Mill Drives and 94% on the plant. The paper
shows detailed figures of efficiencies and availabilities reached in 2011 and 2012.
10:05 AM
HPGR Technical Development & Applications in
Hard Rock Mining
E. Burchardt 2 and H. Plath 1 ; 1 Polysius Corp, Atlanta, GA and
2
ThyssenKrupp Polysius AG, Neubeckum, Germany
HPGR technology has been established and has proven itself in a variety of challenging
applications in the mining industry worldwide. The continued development
of HPGR-based grinding systems follows the requirements set by the trends
in the industry. Mining companies are increasingly challenged to exploit very
large deposits consisting of low grade ore, often in extremely remote locations,
with water being a scarce resource. The consequences for the strategic development
of mineral processing technology and thus HPGR are evident: - Large capacity
units are required to limit the number of machines needed for concentrators
of 150,000 tpd and more. New large HPGR units are already available and
even larger ones are on the drawing boards. What are the implications of these
large HPGRs? - Low grade deposits and growing costs for energy and wear materials
require highly efficient grinding circuits. New HPGR based grinding systems
and their economic benefits are presented. - To reduce overall process water
requirements for such plants, dry grinding systems with or without HPGRs - can
be applied to mineral processing plants. Benefits and limitations of such systems
are presented.
10:25 AM
Worlds Greatest Throughput Cone Crusher
J. Dulmes and K. O’Bryan; FLSmidth, Wales, WI
Preparation, planning and production for the Worlds Greatest Throughput Cone
Crusher operating at Osiskos Canadian Malarctic Gold Mine.
9:25 AM
Pilot Study on the Influence of Eccentric Speed on Cone Crusher
Production and Operation
D. Jacobson; Metso, Waukesha, WI
There are many different machine setup parameters and variables that affect the
production of cone crushers in a mineral processing plant, including the eccentric
speed. Pilot tests were conducted on a 200 hp cone crusher to determine the production
and operating conditions over a wide spectrum of eccentric speed. For
high speed cones, the crusher will exhibit a different capacity, power, and discharge
as the speed ranges over the design limits. This study documents the measured
variation in production and energy efficiency over a range of speeds.
Overall, the capacity and power fluctuated by XX% and XX%, respectively over
the speed range when operated full. The results with a fixed feed rate were more
telling, as the crushers were XX% more productive on average when operating at
an optimal speed versus non-optimal. Varying the speed of the crusher can be
used to tune the crusher speed during commissioning, adapt to changing ore conditions
over long periods of time, or be used as a dynamic input into an advanced
This is the Technical Program as of September 1, 2012. IT IS SUBJECT TO CHANGE.
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Please see the Onsite Program for final details.