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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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The Ultimate Scientific and Technical Reference
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Unit operations. Chemical reaction engineering
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Screening surfaces
Screening parameters
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 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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