Abstract: Common methods for the treatment of waste water containing heavy metal ions exist some in surmountable difficulties at present， such as the high cost and the secondary pollution， etc. Techniques of ferriter precipitate and high gradient magnetic separation for treating waste water containing heavy metal ions were studied. Copper sulphate solution with Cu²⁺concentration of 100 mg/L was adopted as typical waste water containing heavy metals. Test results show that， under the optimal solution pH of 10.47 and the molar ratio of iron salt to copper ion of 1.0， a maximum copper ionprecipitation rate of 99.98% can be achieved. The residual concentration of copper ion after precipitation is only 0.0127 mg/L. 93.39% of copper ion precipitation can be removed rapidly by HGMS method， when adding magnetite to the precipitated solution as magnetic seed. And the optimal molar ratio of Fe₃O₄ to copper ion is 0.8， diameter of magnetic medium of grid matrix is 0.6 mm， magnetic field intensity is 1.0 T. Test results can provide the oretical basis for the treatment techniques of waste water containing heavy metal ions， and supply some technical support for industrial application.

Key words: Heavy metal-ions, High gradient magnetic separation technology, Treatment of wastewater containing copper ions, Ferriter