Morocco - Recycling fly asherFly ash is a by-product of coal-burning power plants. Lafarge recycles it by adding it to cement, thus preserving natural resources while cutting CO2 emissions. ObjectiveTo recycle fly ashes by adding it to raw meal and using it as a cement additive. These alternative raw materials are recognized for their properties as hydraulic binders. ContextIn Morocco, coal-fired power plants are estimated to generate some 570,000 metric tons per year of fly ash (including 400,000 tons per year recoverable as dry matter). The ash was formerly dumped in the sea or stored in dams. However, it pollutes soil and groundwater and affects marine flora and fauna. SolutionWithin the framework of a consortium, Lafarge Maroc and other cement manufacturers signed a contract with Jorf Lasfar Energy Company to purchase the fly ash produced by the latter's power plant. The Bouskoura cement plant invested in new infrastructure to accommodate use of the fly ash as a cement additive: a 5,000-ton silo, a metering system and a conveyance system to feed the grinders. Today, the Bouskoura plant produces cement with a 6.5% fly ash content. ResultsLaunched in 1999 with a temporary installation designed to recycle 40,000 metric tons of fly ash per year, the recycling capacity of upgraded installations amounts in 2006 to more than 200,000 metric tons for a full year of operation. By limiting the stockpiling and dumping of ash, this project reduces soil and groundwater pollution and protects the marine environment. It is also a factor in resource conservation and reduction of CO2 emissions. Cost€2 million. LocationLafarge Maroc, Bouskoura. |
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