还原焙烧铁矿磁选精矿的工艺矿物学及反浮选机理研究

Studies of process mineralogy and reverse flotation mechanism on magnetic separation iron concentrates reducing roasting

运用矿物解离度测定仪，研究了酒钢还原焙烧磁选精矿的化学组成、矿物成分、解离度、共生关系．单矿物浮选试验表明，当pH=6～10，新型阳离子捕收剂GE-609用量为5×10-5 mool／L时，石英的回收率大于80％，而磁铁矿的回收率小于20％．采用GE-609对焙烧磁选精矿进行反浮选试验，采用一粗一精四扫的闭路流程，获得了产率82．42％，TFe品位62．17％，回收率92．59％的精矿．Zeta电位、溶液化学、吸附量和红外光谱研究表明：pH=6～10时，石英（PZC=2．3）表面主要为负电荷，对ERNH_4]2＋，ERNH_3]＋电性吸附作用强，吸附量较大，可浮性较好；而磁铁矿（PZC=6．4）表面荷负电少，对阳离子药剂的吸引力弱，吸附量小，可浮性差．

Using the mineral liberation analyser, the process mineralogy of the reducing roasting magnetic separation iron concentrates were investigated to identify the chemical compositions, mineral components, degrees of dissociation and symbiotic relationships. The results show that when the dosage of a new cationic collector alkyl polyamine ether GE-609 is 5 × 10-5 mol/L and pH is 6-10, for the single mineral flotation the recovery of quartz was over 80% while the recovery of magnetite was less than 20%. Reverse flotation experiments on roasting magnetic separation iron concentrates were carried out with GE-609. The iron concentrates with the yield of 82. 42%, the grade of 62. 17% and the recovery of 92. 59% was obtained through the closed-circuit flowsheet of one roughing, one cleaning and four scavengings. The surface of quartz（PZC= 2. 3） is charged more negative charges than magnetite, resulting in more strong electrostatic adsorption to [RNH4]2＋ and [RNHa]＋. The adsorption capacity of GE-609 on quartz is larger and the floatability of quartz is better. The magnetite（PZC= 6.4） whose surface is charged less negative charges produces weaker attraction to cation reagent, which leads to the smaller adsorption capacity and the worse floatability.