材料期刊网

黄铁矿是特殊的含2价铁的弱磁性矿物，通过调节矿浆温度和 pH 值增强其磁性，即所谓“自磁化”，并将自磁化反应产品磁性黄铁矿作为磁种用于黄铁矿石的浮选，提高浮选的回收率。通过自磁化试验、VSM 磁性测定、XPS 能谱分析、浮选试验以及激光粒度分析，研究黄铁矿的自磁化及其在黄铁矿浮选中的应用。结果表明：黄铁矿最佳自磁化条件为：矿浆 pH 值为11.81、温度为65°C；黄铁矿自磁化后磁性变强的原因是自磁化后黄铁矿表面铁的价态发生了变化，部分 Fe2+被氧化成了 Fe3+，表面有磁性 Fe3O4生成；黄铁矿浮选回收率随磁性黄铁矿磁性的增加而提高，磁性黄铁矿最佳用量为100 g/t；磁性黄铁矿能促进微细粒黄铁矿发生磁团聚，且磁性越强，团聚体粒径越大，使其更适合浮选。

Pyrite is a special weakly magnetic mineral containing Fe(II). Its self-magnetization only by adjusting slurry temperature and pH value was able to enhance its magnetism, producing the so-called the magnetized pyrite, which was further used as magnetic seeds in the flotation of pyrite ore to promote flotation recovery. Tests, such as self-magnetization, vibrating sample magnetometer (VSM), XPS, size analysis and flotation were carried out. The optimal conditions of the pyrite self-magnetization were pulp pH of 11.81 and temperature of 65 °C. The magnetized pyrite was characteristic of the valence change of elemental iron, resulting in stronger magnetism of the magnetized pyrite than that of the original pyrite. Then, this magnetized pyrite was applied to the magnetic seeding flotation (MSF) of pyrite ore. It was found that the recovery of pyrite flotation grew with the increase of magnetic susceptibility of the magnetic seeds?the magnetized pyrite; and the proper dosage of the magnetized pyrite was 100 g/t. The reason behind the increased recovery lies in that the magnetized pyrite promoted the magnetic agglomeration between fine pyrite particles;and the fact that the stronger the magnetism of the magnetized pyrite, the larger the aggregate size, indicates that the agglomeration is somewhat in line with the flotation, also confirming that the MSF is more suitable for fine particles than traditional flotation.