某高硫磁铁精矿磁选—脱磁—复合活化反浮选脱硫试验

对TFe、S品位分别为55.61%、3.81%，主要硫化矿为磁黄铁矿和黄铁矿的某磁选铁精矿进行了系统的磁选—脱磁—复合活化反浮选脱硫试验研究。试验结果表明，该试样在磨矿细度-0.038 mm占88.32%条件下进行弱磁选，磁选精矿脱磁后，用硫酸调整矿浆pH值至5.5，以H₂C₂O₄+CuSO₄+Na₂S为复合活化剂，高级黄药（烃基碳原子数为5~7，下同）+丁铵黑药为组合捕收剂，进行了一粗两扫三精反浮选全流程闭路试验，试验取得了铁精矿TFe品位66.71%、TFe回收率81.57%、S含量0.33%，副产品硫精矿S品位29.98%的良好指标。该研究较好地解决了矿山实际生产问题。 

Desulfurization Experiment of a High Sulfur Iron Concentrate by Magnetic Separation-Demagnetization-Composite Activation Reverse Flotation

Systematic magnetic separation-demagnetization-combined activation reverse flotation desulfurization experiments were carried out on a magnetic concentrate with the iron grade of 55.61% and the sulfur grade of 3.81% whose main sulfide ores are pyrrhotite and pyrite. The test results showed that the sample was subjected to a weak magnetic separation test under the condition of grinding fineness -0.038 mm accounting for 88.32%. After demagnetization of the magnetic separation concentrates, the closed-circuit test of the whole process of "one-stage roughing, two -stage scavenging, three-stage cleaning and reverse flotation" was carried out with the pulp pH of 5.5 adjusted by sulfuric acid, compound activator of H₂C₂O₄+CuSO₄+Na₂S, and combined collector of the advanced xanthate (hydrocarbyl carbon number is 5-7) and the ammonium butyl aerofloat. The test finally obtained the iron concentrate grade of 66.71%, the iron recovery of81.57%, the sulfur content of 0.33%, and the by-product sulfur concentrate sulfur grade of 29.98%. The study better solved the actual production problems of the mine.