东鞍山铁矿石中菱铁矿对反浮选的影响

几年东鞍山铁矿石中碳酸盐矿物含量增加，反浮选指标随之恶化，甚至出现“精尾不分”现象。为此，在单矿物浮选试验的基础上，采用SEM和EDS分析手段，对造成这种现象的原因进行了研究。结果表明，可在一定程度上受到淀粉抑制但抑制作用较弱的菱铁矿在赤铁矿和石英表面的吸附罩盖，是引起东鞍山含碳酸盐铁矿石反浮选困难的主要原因。因此，要实现东鞍山含碳酸盐铁矿石中铁矿物与石英的有效分离，关键是如何在反浮选之前预先将菱铁矿分离出去，或找到能有效活化或抑制菱铁矿的浮选药剂。

Influence of the Siderite in Donganshan Iron Ore on Reverse Flotation

In recent years, the content of carbonate minerals in Donganshan iron ore has been increasing, leading to deteriorated reverse flotation performances or even “unclear separation between concentrate and tailing”. Based on single mineral flotation tests, SEM and EDS analysis means were used to study the case. The result shows that the adsorptive cover of siderite that is weakly depressible by starch on the hematite and quartz is the main cause for difficult reverse flotation of Donganshan iron ore containing carbonate minerals. Therefore, the key in realizing an efficient separation between the iron minerals and the quartz is to separate the siderite prior to the reverse flotation or to find a flotation agent capable of effectively activating or depressing siderite.