Blooming slag heaps

2019-03-07 03:20:07

By Barry Fox John Berry of North Lincolnshire has come up with a way of making slag heaps bloom (GB 2 338 706). Silt dredged from an estuary is mixed with hydrated calcium sulphate, a by-product of making titanium dioxide. Then you add pulverised fuel ash from a coal-fired power station. Each material on its own would be useless, but calcium sulphate washes out the salt in the silt while the ash adds nutrients. Assorted grass and shrub seeds are added to the mix, which is then moistened and pumped over the derelict site. Adding organic waste,