新疆某菱铁矿磁化焙烧—磁选试验

A Study of Magnetizing Roasting-magnetic Separation for Xinjiang A Siderite

以新疆某地菱铁矿为原料,详细研究了焙烧温度、焙烧时间、还原剂用量、菱铁矿粒度、焙烧产物磨矿细度和弱磁选磁场强度等因素对磁选效果的影响。结果表明:16～10 mm的菱铁矿在不加还原煤、焙烧温度为800℃、焙烧时间为15 min条件下的焙烧产物磨至-0.074 mm占90%,经1次弱磁选(151.20 kA/m),可获得铁品位为63.55%、回收率为95.76%的铁精矿。

Taking Xinjing a siderite as investigated object the effects of various factors to magnetie separation, such as roasting temperature, duration, mass ratio of coal to ore, grinding fineness of roasted ore and magnetic field intensity were investigated. It is shown that the magnetic concentrate, assaying 63.55% iron at 95.76% iron recovery, was produced under such conditions as roasting 16 - 10 mm siderite at 800 ℃ for 15 rain within MUFFLE furnace in air atmosphere , and magnetic separation of the roasted ores with grinding fineness of 90% passing 0. 074 mm and at 151.20 kA/m field intensity.