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Calcium oxide is a cheap, chalky chemical compound commonly used in the manufacturing of cement, plaster, paper, and steel. But the material may soon have a more high-tech application. UChicago ...

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The calcium oxide then reacts with silica (sand) impurities in the haematite, to produce slag – which is calcium silicate. This is separated from the iron and used to make road surfaces.

This is an outline of the required steps to undertake one of these methods. Calcium oxide or calcium hydroxide can be used in this practical. Use a measuring cylinder to add dilute hydrochloric ...