Limestone and Crushed Rock
used for potable water softening and to remove impurities (such as lead) from drinking water. Second, it is a cost-effective method for treating sewage sludge. Third, stack gases ... Limestone and Other Crushed Rock Production and Energy Consumed by Type a Units 1987 1992 1997 Limestone and Rock Production b Billion tons - 1.2 1.2 EnergyWeb
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