Up to 20,000 tonnes of shells would be stored in limestone-capped stockpiles at the Cape Foulwind quarry for between four and six months.Mr Dempsey said mussel shell was almost pure calcium carbonate, a fundamental raw material for cement. It was now sourced from limestone in the quarry but mussel shells provided a particularly pure supplement.”The benefit comes from having a higher quality raw material. The cement quality will be the same. Essentially it is a cheaper way of supplementing the limestone that we need,” he said.”We’ve still got about 50 years worth of limestone in the quarry, so it’s not trying to extend the life of the quarry. It’s to utilise good quality material for our processing but also to solve an ecological problem for the companies producing the mussels.”Holcim had trialled using mussel shells in its kilns.”It looks as though, from a chemistry point of view, the trials are successful. Ecologically and economically, provided we get the mussel shells delivered at a suitable price, it could be a good supplement for our raw materials.”A contract with Sealord had not been finalised.SOURCE: www.tv3.co.nz
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