贫赤铁矿的浮选用浮选方法从低品位矿石中回收赤铁矿。磨矿时矿浆添加分散剂(如淀粉)搅拌,并用碱调整矿浆至pH>7,然后在以石油磺酸为基质的絮凝剂存在下进行浮选。从而细磨的赤铁矿在上述pH=10的条件下进行选别。浮出脉石(特别是SiO_2和含铁的白云石)获得质 Lean hematite flotation Hematite recovery from low grade ore by flotation. Pulverized slurry was added dispersant (such as starch) with stirring, and adjusting the pulp with alkali to pH> 7, and then flotation in the presence of a petroleum sulfonic acid-based flocculant. The finely ground hematite was thus sorted at the above pH = 10. Floating gangues (especially SiO 2 and iron-containing dolomites) are of high quality