Abstract: The processing technology of the pyrite cinder from a chemical plant in Wuhan is that the iron recovered by low intensity magnetic separation and arsenic removed by chemical method. The conditions of low intensity magnetic separation include grinding fineness -0.038 mm 80%, magnetic field intensity 160 kA/m, under which the iron concentrate containing Fe 61.91%, S 0.682% and As 0.381% with the iron recovery 92.96% was obtained by one stage magnetic separation. The conditions of chemical leaching of iron concentrate by hydrochloride include pulp density 40%, ratio of hydrochloride and the solid(iron concentrate) 1∶25, the leaching time 40 min, the agitation intensity 300 r/min and washing 3 times after filtering waste acid, under which the iron concentrate assaying Fe 63.35%, S 0.325% and As 0.083% with the iron recovery 92.88% iron grade 63.35% can be achieved. How to ensure the effectiveness of arsenic removal while increasing the sulfur removal rate is need for further study.

Key words: Pyrite cinder, Low intensity magnetic separation, Chemical leaching, Iron recovery, Arsenic removal