The sweepings include a significant mineral part: sand, dust, small pebbles or gravel, etc. apart from organic fractions (wood, foliage, various organic debris, etc.) and a fraction consisting of various waste and varieties left on the pavement.
The purpose of screening is most of the time to separate the mineral fraction which constitutes a marketable product for embankments and under the basement of roadways or car parks for example.
The mesh used during this separation oscillates between 8-12 mm. The most common screening technology is the trommel screen. Quarry vibrating screens can also be used in certain cases, especially if the substrates are very dry.
The company TERRA-SELECT offers interesting solutions of trommel screens with mesh shapes adapted to this use, misting systems for the fight against the release of dust, separators of the light fraction (which can go in CSR) integrated at the screener.
The wood fraction can again be separated later during a new treatment using an air separator combined with a tangential roller and also recovered in boiler rooms. TERRA SELECT also has interesting solutions in its range, both fixed electric and mobile diesel for this recovery stage.
we use screening buckets. our cups make it possible to separate the fines from the largest elements 0/10mm. it is particularly interesting for low volumes because the cost is low (about 1$ per ton screened)
