Nov 24, 2014· Electrostatic air filters also block air flow more than conventional air filters. Although this may not seem like a big deal, it is to your HVAC system. If air flow is restricted by 50%, then your air conditioner has to work twice as hard to do the same amount of cooling.
GOLD FLOTATION The flotation process, which is today so extensively used for the concentration of basemetal sulphide ores and is finding increased use in many other fields. In 1932 flotation plants began to be installed for the treatment of gold and silver ores as a .