Abstract: Feasibility of the technology that uses pyrite cinder as absorbent to absorb SO₂ from flue gas was explored.Absorption process was theoretically analyzed and experimentally studied.Influences of pH，temperature，and other factors on SO₂ absorption rate were investigated by orthogonal experiment and the best absorption process conditions were obtained，as follows：pH≈3，temperature was 50 ℃，ratio of liquid to gas was 4 L/m³，liquid-solid mass ratio was 8∶1，and empty tower velocity was 3 m/s^-1.Experimental results showed that the technology′s desulphurization effect was very good，which could achieve industrial discharge standard.Moreover，it was also very simple to operate，and purpose of‘treating waste with waste and turning waste into treasure’could be achieved.Therefore，it provided a new way for the treatment of industrial waste gas.

Key words: pyrite cinder, sulfur dioxide, absorption