红土镍矿含碳团块直接还原生产镍铁粒工艺

Production of ferro-nickel granules from nickel laterite ore/coal composite briquettes by direct reduction

  • 摘要: 以红土镍矿和煤粉复合团块为原料,利用高温直接还原制备镍铁粒.讨论了焙烧温度、焙烧时间、C/O摩尔比和熔剂加入量对镍、铁品位和回收率以及对镍铁粒质量的影响.当焙烧温度为1350℃、C/O=1.4、焙烧时间为60 min以及石灰石加入量为20%时,镍、全铁品位分别为9.4%和87.5%,镍、铁回收率分别为96.6%和97.9%.X射线衍射、扫描电镜及能谱分析表明,镍铁粒中镍、铁基本以合金态存在,碳基本固溶在合金中.

     

    Abstract: Ferro-nickel granules were produced from nickel laterite ore/coal composite briquettes by high-temperature direct reduction.The effects of roasting temperature,roasting time,C/O(carbon/oxygen) molar ratio and flux amount on the grades and recovery rates of nickel and iron as well as on the quality of ferro-nickel granules were studied.The grades of nickel and total iron in the granules are 9.4% and 87.5% and the recovery rates of nickel and iron are 96.6% and 97.9%,respectively,when the roasting temperature is 1350℃,the C/O molar ratio is 1.4,the roasting time is 60min,and the limestone amount is 20%.The ferro-nickel granules were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM) equipped with an energy dispersive spectrometer(EDS).The results show that nickel and iron basically exist in alloy state,and carbon is solid-soluted in the alloy.

     

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