| Upcoming Training Courses:
Atlanta, Georgia December 10-11, 2008
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| Greetings!
Greetings!
Welcome to Jenike & Johanson's Mining E-Newsletter. In this Fall 2008 issue, we focus on cost-saving solutions to some of the material handling problems in the mining industry. 
The recent economic developments have caused a slowdown for some sectors of the mining industry. This period of slowdown offers a great opportunity to think about improvements to your material handling systems, and be ready when the market improves. While there is capital cost involved, in most cases it is a small fraction of the savings that can be made in the long term. Be it stockpiles, dump hoppers, ore-passes, surge bins or transfer points, proven, practical solutions are available to improve their performance. Jenike & Johanson is prepared to assist you with material storage and handling projects at your mines. This e-newsletter is a launching point for helping you to understand how to solve your ongoing flow problems and how to prevent them in new installations. |
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Have You Ever Wished Your Stockpile Had More Live Capacity?
 Stockpiles are one of the most economical means of storing large quantities of ore. However, if the reclaim system is not properly designed, arching and ratholing may occur over reclaimer hoppers. In such cases, only a small fraction of this total capacity can be reclaimed, which means more downtime and lack of surge capacity.
 Typically, several gravity reclaim hoppers, with either apron or belt feeders, are used under stockpiles to discharge the ore onto a common collection belt conveyor. The number, size, location and orientation of these hoppers must be determined by taking into account several factors including the size of the stockpile, desired live capacity, flow rates, flow properties of the ore, ambient conditions such as precipitation and temperature, and handling effects such as dust emissions and segregation. If the reclaim system is designed without considering all these factors, problems in material flow are bound to occur.
The flowability of most ores is primarily affected by the percentage and distribution of fines, moisture content, storage time at rest, presence of clays and environmental conditions. The key to reliable operation is to design the reclaim system taking into account the likely variation of flow properties of the ore.
We have worked on numerous projects providing reclaim system designs for new installations as well as retrofits, using our typical project approach. With our proven design methodologies and 3D CAD program we can estimate live storage capacities of stockpiles, based on measured flow properties test data. We can assist you in designing or improving your stockpile reclaim system.
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Do Your Transfer Points Need Attention?
 The adage "a conveying system is only as good as its transfer points" becomes more obvious as the conveying rate increases. Poorly designed transfer points plug frequently, are prone to high wear, create spillage and dusting problems, and cause high belt wear. The result of one such problematic arrangement can be seen in the adjoining picture. Free fall height and abrupt changes in the direction of material flow should be minimized in order to control material impact pressures that can cause buildup of ore and can also lead to high chute wear. A chute must be only steep and smooth enough to permit sliding and clean-off of the most frictional material. Chutes should be no steeper than necessary to keep material velocities, and hence wear, to a minimum.  The photograph alongslide shows the upper portion of an improved design. We have worked on numerous projects designing transfer chutes for various ores and products. Some of these transfer points have been conveying material at rates as high as 11,000 tons per hour. If you have a transfer point that needs improvement, we can assist you.
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Course Offering - Flow of Solids in Bins, Hoppers, Chutes & Feeders
December 10-11, 2008 in Atlanta
 Jenike & Johanson engineers will be presenting their popular powder and bulk solids handling courses for ASME/AIChE (American Society of Mechanical Engineers and American Institute of Chemical Engineers) in Atlanta, Georgia on December 10-11, 2008.
This course is highly recommended for personnel in mining industry involved in selection, operation and maintenance of ore and concentrate handling equipments. It will arm them with the knowledge required to reliably handle these materials.
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Recent Mining Publications
 For more information on the following publications, please contact Jenike & Johanson directly via email or telephone at 978-649-3300.
- "Design of Stockpiles in Mining Operations" by Francisco J. Cabrejos, presented at Argentina Mining 1996, in Mendoza, Argentina
- "Ore Pass Design for Reliable Flow", by David J. Goodwill and Francisco J. Cabrejos, Bulk Solids Handling, January 1999, pp.13-22
- "Chutes as the Ultimate Dust Control", by Greg Petro, Thomas J. Baxter and Francisco J. Cabrejos, presented in Powder and Bulk Engineering, July 2004, pp. 36-46
- "Interfacing Belt Feeders and Hoppers to Achieve Reliable Operation", by John W. Carson, Francisco J. Cabrejos and Michael Rulff, presented at 2008 SME (The Society of Mining, Metallurgy and Exploration) Bulk Materials Handling Symposium, February 24-27 2008, in Salt Lake City
Contact Jenike & Johanson about these publications. |
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Background of Jenike & Johanson
Jenike & Johanson is a consulting engineering firm specializing in the science and technology of bulk solids handling. In our four laboratories in the United States, Canada, and Chile, we have tested more than 10,000 bulk solids and used the results to design accurate, cost-effective solutions to flow-related problems for more than 3,000 companies around the world in such industries as cement, chemicals, pharmaceuticals, energy, mining, consumer goods, solid waste, and more.
We have over forty years experience applying practical, science-based technologies to implement robust processes, and a history of solving difficult challenges others cannot resolve.
Learn more about Jenike & Johanson's role in the mining industry. | |
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We look forward to providing you with practical, cost-effective solutions to your bulk solids handling problems.
Sincerely, |
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