1. Screening surfaces
Paragraph written in collaboration with J. M. OUDOT (Établissement Gantois).
The product fed to a screen is called the "all-runoff": the screening process separates the all-runoff into passings (or sieves) and rejects. A screen's throughput (or screening capacity) corresponds to the hourly mass quantity that the machine can receive for a given screening efficiency.
Granularity refers to the set of characteristics defining the granular state of a product, with :
granulometry, measurement of grain size and distribution;
the length of a grain, its largest dimension, and its thickness, the distance between two parallel planes through which the grain can pass;
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Screening surfaces
Screening parameters
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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 an entire 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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