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本文研究了絮团磁选 (FMS)法 ,即以絮团形式磁选细粒弱磁性铁矿石 ,以代替强磁选机或高梯度磁选机处理细粒弱磁性铁矿石。本研究用细磨至微米级的赤铁矿和褐铁矿进行 ,添加油酸钠和煤油引起疏水絮凝 ,形成大的絮团。试验结果表明 ,与相同条件下的常规磁选相比 ,FMS法可用中场强磁选机有效地回收细粒赤铁矿和褐铁矿 ,并且获得高的分选效率。FMS法处理铁品位为 30 5 %的赤铁矿矿石时 ,获得的精矿铁品位为 6 4%,回收率为 82 %。研究发现 ,FMS法的分选效率与疏水絮凝主要参数 (油酸钠用量、搅拌时间和煤油用量 )密切相关。这表明 ,FMS法具有高的分选效率可归因于疏水絮团的形成 ,使得磁场作用在细粒铁矿物的磁力增大 ,在磁选机中细粒铁矿物更易附着在齿板上 ,从而进入磁性精矿中。
In this paper, the flocculation magnetic separation (FMS) method is studied, that is, the flocs are used to select fine-grained weak magnetic iron ore to replace the strong magnetic separator or high-gradient magnetic separator to treat the fine weak magnetic iron ore. In this study, finely ground to micron hematite and limonite, adding sodium oleate and kerosene to cause hydrophobic flocculation to form large flocs. The experimental results show that compared with the conventional magnetic separation under the same conditions, the FMS method can effectively recover the fine hematite and the limonite by using the mid-field strong magnetic separator, and obtain high separation efficiency. FMS treatment of hematite ore with an iron grade of 30.5% resulted in a concentrate grade of 64% and a recovery of 82%. The study found that the separation efficiency of FMS is closely related to the main parameters of hydrophobic flocculation (sodium oleate dosage, mixing time and kerosene dosage). This indicates that the FMS method has a high sorting efficiency due to the formation of hydrophobic flocs, which increases the magnetic force of the magnetic field on the fine-grained iron minerals, and the fine-grained iron minerals are more likely to adhere to the tooth plate in the magnetic separator On, thus entering the magnetic concentrate.