Overhead protection systems (OPS): some recent applications

CIM Journal, Vol. 3, No. 3, 2012
W. Roelofs Minvent Solutions, Como, Australia M. C. Walton RefMet, Prahran, Australia
Abstract
In most cases, a
refractory repair involves dealing with used refractory linings above shoulder
height, defining these as overhead refractories. This paper details a method of
personnel protection involving a low-pressure inflatable balloon system,
installed to prevent the dislodgement and freefall of in-situ refractories. This
system has been successfully applied to numerous types of vessels in the process
industries in the last three to four years. This paper, prepared for the CIM
Conference of Metallurgists held in Vancouver, British Columbia in October 2010,
outlines details of the system and gives examples of successful
applications.
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Publication: CIM Journal
Issue: 3
Volume: 3
Year: 2012
Text
Summary: Under certain conditions of moisture and oxygen, sulphides can
spontaneously self-heat. We tested a hypothesis that galvanic interaction
between some sulphides can promote self-heating. Galvanic interaction is
controlled by the rest potential difference between sulphides and particle size.
A series of binary sulphide mixtures was tested. Individual sulphides and
mixtures with low rest potential difference did not self-heat, but mixtures of
high rest potential difference did. When testing...
Publication: CIM Journal
Author(s): R. Payant, F. Rosenblum, J. E. Nesset, and J. A. Finch
Department of Mining and Materials Engineering, McGill University, Montréal, QC
Issue: 3
Volume: 3
Year: 2012
Text
Summary: The sensitivity of sulphide minerals towards oxidation depends on the
mineralogical makeup and nature of sulphide ores. This paper focuses on
chalcopyrite behaviour in a nickel-copper sulphide- ore matrix that was aged in
the mine-site stockpiles. Results of collectorless, collector-induced flotation
and recovery by size are presented following a discussion of XPS analysis that
was used to gain insight into oxidative alteration of chalcopyrite’s surface
chemistry. Chalcopyrite maintains...
Publication: CIM Journal
Author(s): S. Kelebek
Queen’s University, Kingston, ON

B. Nanthakumar
Process Research ORTECH Inc., Mississauga, ON
Keywords: Chalcopyrite, Stockpile oxidation, Surface chemistry, XPS analysis, Flotation, Recovery by size
Issue: 3
Volume: 3
Year: 2012
Text
Summary: This paper explores passive seismic measurement as an alternative,
nonintrusive approach to conducting annual brake testing on surface mine sites.
Dictated by the test site location, this evaluation adhered to the brake testing
procedure as per British Columbia occupational health and safety regulations.
Results showed excellent correlation to those reported via conventional
practice: Comparing stopping distance, time, and velocity for the proposed
instantaneous passive seismic versus...
Publication: CIM Journal
Author(s): T. G. Joseph
Alberta Equipment – Ground Interactions Syndicate, Edmonton, AB

M. J. Bolster
Worley Parsons (CoSyn) Consultants, Edmonton, AB
Issue: 3
Volume: 3
Year: 2012
Text
Summary: Cameco Corporation is
revitalizing its Key Lake Operation uranium mill in northern Saskatchewan. The
mill currently uses ammonia stripping in solvent extraction (SX) and ammonia
yellowcake precipitation. As part of the revitalization, the company considered
installing strong acid stripping in solvent extraction (used at its Rabbit Lake
Operation), which would lead to using hydrogen peroxide for uranium
precipitation. As part of the process evaluation, tests were carried out to
study how the...
Publication: CIM Journal
Author(s): C. Rodgers and B. Dyck
Cameco Corporation, Saskatoon, SK
Issue: 3
Volume: 3
Year: 2012
Text
Summary: The options for reducing the carbon footprint of energy use in mining
fall into three categories of activity: i) reducing demand, ii) improving energy
utilization, and iii) adopting low carbon energy technologies. In addition to
the environmental imperative, the economic case for these activities gains
higher priority as the prices of electricity, gas, and liquid fuels increase.
Low-carbon, energy-saving technology options that are available to mining
industry companies lead to projects with...
Publication: CIM Journal
Author(s): D. L. Millar and M. Levesque
Bharti School of Engineering, Laurentian University, Sudbury, ON

G. Lyle and K. Bullock
Centre for Excellence in Mining Innovation, Sudbury, ON
Issue: 3
Volume: 3
Year: 2012
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