The invention discloses a
copper-
nickel containing industry
sludge harmless recycling method. The content of
copper in
copper-
nickel containing industry
sludge and the content of
nickel in the copper-nickel containing industry
sludge are each 1%-3%. The method comprises the following steps that firstly, after 6%-25% of a vulcanizing agent, 6%-30% of a
solvent, 0.5%-2.5% of a fluxing agent and 5%-20% of a
reducing agent are added in the copper-nickel containing industry sludge to be evenly mixed,
pelletizing is conducted, and green
pellets are obtained; secondly, after the green
pellets are dried along with a furnace, the green
pellets are sintered for 30 min-90 min at the temperature
ranging from 1,000 DEG C to 1,150 DEG C, and sinter is obtained; and thirdly, the sinter obtained in the second step is ground till the content of -0.074 mm accounts for 60%-85%, then, 2# oil serves as a
foaming agent, butyl
xanthate serves as a collecting agent, the usage amounts are 100 g / t and 200 g / t correspondingly, and copper-nickel mixed concentrates and
tailings are obtained through flotation. The economical and reasonable method for achieving harmless recycling is provided for overcoming the defects in copper-nickel containing industry sludge treatment in the prior art.