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Scaleup slated for a ‘greener’ cement

By Gerald Ondrey |

This summer, Celitement GmbH (Eggenstein-Leopoldshafen, Germany; www.celitement.de) will begin construction on a pilot plant to produce a new cement known as Celitement. Located at the north campus of the Karlsruhe Institute of Technology (KIT; www.kit.edu), the facility will produce up to 100 kg/d of Celitement when it starts operating in 2011, using a process first developed at KIT. In the first step, limestone and sand (Ca-to-Si mole ratio of 0.5–2.0) and water are transformed into calcium silicate hydrates in an autoclave operating at 180–210°C and 10–20 bar. The product is dried, then mixed with a second silicate component and transformed into Celitement — a hydraulically active calcium hydrosilicate — by a reactive milling process. Additives can be used to control the hydration and the quality of the final product. The process operates at considerably lower temperatures than that used in conventional routes to Portland clinker (up to 1,450°C), and therefore consumes about half the energy with a corresponding reduction in CO2 emissions, says the company. The process also uses “far less” lime, and the product binding material can be handled just as ordinary Portland cement. Addition…
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