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Introduction. Sand and gravel are used extensively in construction. In the preparation of concrete, for each tonne of cement, the building industry needs about six to seven times more tonnes of sand and gravel (USGS, 2013b). Thus, the world’s use of aggregates for concrete can be estimated at 25.9 billion to 29.6 billion tonnes a year for 2012 alone.

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In India, Indian Rare Earths Ltd began extraction of rare earths in the year 1914 with the finding of the resources by Germany Scientist Schomberg. However, from the mid-1980s Chinese found that their rare earths associated with iron minerals can be more efficiently extracted. In carefully devised 5-year plans, from mid-1980s the Chinese started to produce rare earth minerals and products in ...

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