Patent ID: 9701553
Date: 2017-07-11
CPC Classifications: C02F,Y10S

Claim:
1. A copper recovery apparatus comprising: a mixing and precipitation tank configured to receive water comprising copper ions, an alkali and a filter aid comprising magnetic particles having an average particle diameter of 0.5 to 20 μm to prepare an alkaline suspension containing a precipitate of copper compound; a heater configured to heat the suspension in the mixing and precipitation tank to convert at least a part of the copper compound in the suspension into copper oxide; a filter-aid feeder configured to supply the filter aid to the mixing and precipitation tank; a solid-liquid separator comprising a filter, the solid-liquid separator being configured to receive the suspension from the mixing and precipitation tank to subject the suspension to a filtration by the filter so that the precipitate and the filter aid which is retained on the filter is separated from a filtrate; a cleaning-water supply line configured to supply water to the filter having the precipitate and the filter aid retained thereon to remove the precipitate and the filter aid from the filter; a cleaning-water discharge line configured to discharge from the solid-liquid separator the precipitate and the filter aid together with the water supplied by the cleaning water supply line to the filter; a separation tank configured to receive the precipitate, the filter aid and the water discharged from the solid-liquid separator and separate the filter aid from the precipitate and the water by utilizing a magnetic field; and a filter-aid return line configured to return the filter aid separated in the separation tank to the filter-aid feeder.