sexta-feira, 8 de janeiro de 2010

FABRICO DE CIMENTO-MATERIAIS USADOS

The main raw materials used in the cement manufacturing process are limestone, sand, shale, clay, and iron ore. The main material, limestone, is usually mined on site while the other minor materials may be mined either on site or in nearby quarries. Another source of raw materials is industrial by-products. The use of by-product materials to replace natural raw materials is a key element in achieving sustainable development.

In http://www.essroc.com/default.aspx?pageid=183

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