Lhoist is a global leader in lime, dolime and minerals. It will invest around £4million to improve its dolomitic lime production process at the Thrislington site, near Ferryhill in County Durham. The project is based around environmental improvements with a need to install a Bag Filter and ID Fan. Other aspects of the investment are likely to be in new conveyors, vibrating screens and mechanical refurbishment of an existing Lepol Grate Preheater.