The plant was mothballed in 2009 during the recession, but a continuing upturn in construction activity prompted Hanson to return to the site last year and prepare it for re-opening.
It takes blast furnace slag, a by-product of the steel industry, and grinds it into a fine powder for use as a cement substitute in ready-mixed concrete. The raw material was originally sourced from the nearby steel works, which has now closed. It will now be imported, helping to sustain the docks.
It has cost £2m to resume operations. Site manager Duncan Felgate explained: “It has taken nine months to get up and running again. One of the main problems we had to overcome was to replace all the copper wiring, which had been meticulously stripped out by thieves.”
Hanson sells its ground granulated blast furnace slag under the Regen brand name and operates a further two UK production plants at Purfleet in Essex and Port Talbot in south Wales. Replacing one tonne of cement in concrete with Regen reduces the embodied CO2 by around 900kg, and also increases its durability. It is added at the mixing plant and can replace as much as 90 per cent of the cement content, Hanson says.
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