Limiting Dust Emissions by the Implementation of Good PracticesPositive initiatives allow Imerys to limit dust emissions and to foster good relationships with its sites’ neighboring communities. Below, we present some examples.
France: Limiting Dust Emissions Thanks to Protective Screens
Since 2008, the Feldspaths du Morvan site (Minerals for Ceramics, France) has been using front, back and side protective screens when loading products to prevent dust from spreading when the 4 meter-high silos are emptied. During loading, hydraulic jacks press skirts against the skip and a vacuum system controls dust emissions. These new facilities have enabled the site to comply with regulatory thresholds on dust and noise pollution. The ore collected by the dust removal system is recovered and recycled.
Italy: Keeping Dust Down
In 2005, Imerys Minerali’s Granital, a factory dedicated to the production of calcium carbonate, set up a dual system to limit dust emissions. The access ramp to the hoppers runs over a public road. The daily truck traffic throws up dust, some of which falls onto the road, inconveniencing drivers. Due to the inherent problem of dust emissions associated with mining and the proximity of this site to a public road, daily truck traffic was becoming a nuisance for our neighbors. In acknowledgement of our stakeholders concerns, the access ramp is now systematically watered with a sprinkler, keeping the dust on the ground. Additionally, as the trucks exit the site, they must pass through a rinsing facility that cleans their chassis and wheels.
United States: Coating Dust
In an effort to act proactively and take on new challenges, Imerys devises creative schemes to deal with dust. The approach of several American Imerys Filtration sites has been to coat the dust along the roadside near our plants. Regularly spraying the roads with magnesium chloride glues the dust to the ground. The product works for several days. This simple and affordable operation has been in place for over five years, keeping local authorities and neighbors happy.
United States: Replanting Former Quarries
The Imerys Filtration site in Lompoc, California is devoted to the extraction of diatomite, a mineral whose fine particles make dust emissions common. This factory realised that it can keep dust emissions under control by replanting its former mining areas. Together with the Santa Barbara county landfill, this factory recycles landscape waste from the surrounding area. Plant residues are run through a grinder and transformed into mulch. The mulch is spread on the surface of the quarry and mixed with the soil. Another layer of mulch and fertilizer are added before the seed mix is sown throughout the now fertile area. It only takes thirty to forty days for the former quarry to be covered with the vegetation that will keep diatomite particles from becoming dust.