Study Of Properties And Mineralization Of Cu-Ni Bearing Industry Sludge

The properties and mineralization behaviour of a heavy metal industrial sludge with Cu and Ni content of 2.61 and 2.28% were investigated. Themain phases of the sludge are calcium hydrophosphate, gypsum and amorphous hydroxide, silica gel. Heavy metals such as copper and nickel are dispersed in various physical phases, and the mixture of calcium hydrogen phosphate is the main carrier of the valuable metals nickel and copper, which are difficult to be extracted by physical methods. Mineralization test results show that a concentrate with Cu content of 6.96% and Ni content of 6.15% can be obtained by flotation of the sintered product under these conditions: the dosages of bituminous, sodium sulfate, quartz and borax are 15%, 20%, 20% and 2% respectively, the sintering temperature is 1150 degrees C, the sintering time is 60 min. The recoveries of copper and nickel in concentrate are 87.63% and 88.64%, respectively, and the Cu and Ni grade in tailing can reduce to 0.54% and 0.44%, respectively.