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How much is the sand making equipment with an output of 500 tons per hour

Nov 17 2011 At an energy cost of 25 GJ per ton of concrete and a density of 24 tons per cubic meter we end up needing 32 billion kWh of energy per dam and 90 trillion kWh total This over 250 times the amount of energy impounded by the dams and represents three years of the total energy appetite of the US today

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