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ABSTRACT
This article attempts to provide an industrial solution to the unitary screening operations and the usage of equipment specific to this technique. The increasingly high number of screen models has led to an increase in the size and above all the width of screens. Making the right choice is not easy, all the more so as the screening process currently includes several functions. What criteria of choice is to be adopted with regards to the constraints on use? Then, how is the calculation of a screen to be performed? The concrete situation of the mechanical preparation of minerals has been selected in this article in order to illustrate in a better way the designing approach of a screening operation.
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Read the articleAUTHORS
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Pierre BLAZY: Honorary Professor - Former Director, École nationale supérieure de géologie (ENSG)
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Robert JOUSSEMET: Research engineer at the Environment and Mineralurgy Laboratory (LEM) - ENSG-INPL-CNRS-UMR 7569 - Manager of the Steval testing station (Station de valorisation des matières minérales et des substances résiduaires)
INTRODUCTION
This second dossier on screening provides an industrial response to unit screening operations and the use of the equipment described in the first dossier
where he must choose a device according to a certain number of usage constraints;
where he has to calculate a screen, in which case his approach differs depending on whether he's a designer or a user.
In order to present a concrete situation, we focus on the mechanical preparation of ores, a case which is all the more interesting as each ore and each beneficiation plant has its own specificities. It is nevertheless necessary to emphasize the observations that need to be made to define a case realistically.
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Unit operations. Chemical reaction engineering
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Screening
Screen selection criteria
Also in our database
Bibliography
Software tools
Most of the available software packages are simulation models of complete mineral processing or aggregate production units. They always include a specific screening section. Examples include :
Usim-Pac: developed by BRGM and currently marketed by GASPEO http://www.gaspeo.net
Aggflow – The industry standard...
Events
SIM: Annual conference for mining and quarrying professionals http://www.lasim.org
INTERMAT (France) International exhibition of equipment and techniques for public works, construction and the materials industry (every 3 years). http://www.intermat.fr
...Standards and norms
- Test sieve – Metal fabrics, perforated metal sheets and electroformed foils – Nominal dimensions of openings. Classification number: X11-501 - NF ISO 565 - 11-90
- Specification for ware-cloth sieves for testing purposes - ASTME - 11-87
- Industrial screens – Metal fabrics, perforated sheets and electroformed foils – Designation and nominal dimensions of openings - ISO 2194 :1991 - 09-91
- Test sieve...
Directory
Manufacturers – Suppliers (non-exhaustive list)
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Screening equipment manufacturers
Allgaier (vibrating and circular screens) http://www.allgaier.de
Allis Mineral systems (USA) (BAVS banana screens) http://www.metsominerals.com
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Statistical and economic data
Investment costs are incurred when purchasing and installing a complete treatment unit.
It includes the following items:
material purchases 82.2% ;
equipment transport 4.1% ;
installation costs 10.3% ;
workforce 3.4%.
...
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