A pyrrhotite mineral processing method using a low-alkali process of flotation followed by magnetic separation, comprising the following steps: performing a coarse copper particle flotation process on pyrrhotite ores; performing a secondary fine copper particle flotation process on the obtained copper flotation concentrate; performing a copper flotation scavenging process on tailings obtained from the coarse copper particle flotation process; performing a coarse sulfur particle flotation process on tailings obtained from the copper flotation scavenging process; performing a sulfur flotation scavenging process on tailings obtained from the coarse sulfur particle flotation process; and performing a magnetic separation process on tailings obtained from the sulfur flotation scavenging process, so as to obtain iron ore concentrate. The method applies in particular to pyrrhotite having low copper content and high ferrous sulfide content, and uses a low-alkali process of flotation followed by magnetic separation; valuable metals such as copper, iron, sulfur and pyrrhotite in copper-iron ores can be fully recovered.
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