Abstract: The concentrate from a Yunan high sulfur iron ore has a sulfur content that exceeds that specified in the standard due to the pyrrhotite. A test was made for reducing the sulfur content in the concentrate. It adopted a flowsheet of low intensity magnetic separation-floatation and used a combined activator NC and a new collector DY to effect on the pyrrhotite. As a result, the sulfur content in the concentrate was reduced to 0.08% and the iron grade of the concentrate reached 65.04%.

Key words: High sulfur iron ore, Pyrrhotite, Combined activator NC, New type collector DY, Sulfur reduction