共查询到19条相似文献,搜索用时 109 毫秒
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目前红土矿冶炼主要以火法工艺为主,其中含铁较高的红土矿多采用高炉冶炼工艺,文章中以一种铁质量分数50.4%的红土矿为原料,采用高炉工艺冶炼含镍铁水,在关键工艺分析基础上,进行了技术经济分析,为红土矿在我国的合理利用提供参考. 相似文献
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红土镍矿烧结生产是火法冶炼提取镍的关键工序,通过总结分析低镍高铁低硅红土镍矿烧结生产实践,对红土镍矿配矿方案的关键点、工艺参数进行了讨论,对烧结生产改进方向提出了看法,对降低高炉冶炼镍铁成本进行了探讨,同时对在不同红土镍矿原料条件下的烧结生产提出了建议。 相似文献
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为实现铬精粉矿、红土镍矿复合烧结及用该复合烧结矿冶炼镍铬铁合金,有针对性地对铬精粉矿、红土镍矿的相关物理性质和镍铬复合烧结固结机理进行了研究,并结合实验室得出优化配比结果,在烧结生产实践中进一步探索,达到优化方案,降低煤耗20.6%、动力电32.8%,降低了烧结成本,提高质量。同时,介绍了用镍铬复合烧结矿冶炼镍铬铁合金的生产实践,在生产实践中总结得出冶炼工艺经验数据:电炉变压器容量范围为12.5~33 MVA的矿热炉,操作电阻为1.5~1.7 mΩ。采取一些技术措施后,成功实现镍铬铁合金生产,铬回收率93.2%,镍回收率94.7%,冶炼电耗3 449 kWh/t,效果较好,经济效益可观。该镍铬复合烧结工艺及用复合烧结矿冶炼镍铬铁合金得到产业化应用,取得一定成效。 相似文献
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红土型镍矿电炉还原熔炼工厂实验研究 总被引:1,自引:0,他引:1
本文采用1000 kVA的圆形电炉,研究了300 t红土镍矿的还原熔炼过程。通过调整焙砂还原煤的加入量来研究泡沫渣的形成机理,实验表明在干矿中加入还原煤少于4%(干基)会产生泡沫渣;还原熔炼过程镍铁产品的含镍量在16%~22%之间,降低还原煤的加入量,能够提高镍铁产品中镍的品位;电炉中镍的分配系数为100,镍的回收率为94.4%。电炉的能耗随着实验时间的延长而逐步降低。 相似文献
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Theofani V. Tzevelekou Hans Günter Geck Peter van Hüllen Friedrich Hfer Demetrios C. Papamantellos 《国际钢铁研究》2004,75(6):382-392
In the metallurgical plant of LARCO at Larymna, approximately 200000t/y of nickelferrous dust are collected in the gas cleaning systems of the Rotary Kilns (R/Ks) corresponding to an annual production of 100000t FeNi20%. In addition, a stockpile of one million tons of old R/K dust lies close to the plant and the community of Larymna. A “one‐stage” environmentally friendly process has been developed for the recycling of this dust by direct reduction smelting in a DC arc furnace. The industrial adaptation of this process was tested in the 125t DC‐HEP (Direct Current — Hollow Electrode Powder) furnace at Georgsmarienhütte steelwork (GMH) in Germany. About 70t of dust were directly smelted by injection through the hollow electrode of the furnace. The nickel recovery in the metal bath was 93‐99.9%. Final products were low nickel alloyed steel grades and slag suitable for special cement types production. Main cause of the dust generation in the R/Ks is the disintegration of laterite and the ore fines fraction after the ore crushing. Their separation, collection and metallurgical exploitation prior to their feeding in the R/Ks would significantly reduce the amount of the generated dust. Therefore, the smelting of untreated laterite ore fines in the DC‐HEP furnace was also indicatively tested. Thus, a zero residues industrial production process was developed for the recycling of nickel bearing dust and ore fines by smelting in a DC‐arc furnace, since the finally produced FeNi‐alloy and slag are 100% utilized in the steel and cement industry respectively. 相似文献
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研究对象印尼某红土镍矿为褐铁矿型红土镍矿,具有品位低、成分复杂等特点。为了查明印尼某红土镍矿的微观结构特征从而达到合理且最大程度地回收矿物中Ni、Fe组分,实验利用偏光显微镜、扫描电镜(SEM)、X射线衍射(XRD)和矿物自动解理系统(MLA)等多种测试分析手段对原矿的物相组成、主要矿物的嵌布特征等展开研究。结果表明:100~900℃的温度梯度范围内,该褐铁矿型红土镍矿先后经历了针铁矿脱羟基转变成赤铁矿和铁橄榄石相的形成过程。该印尼红土镍矿中金属矿物主要由针铁矿、铬铁矿、赤铁矿等氧化物组成,脉石矿物主要由石英、铁橄榄石和绿泥石等硅酸盐组成。针铁矿是Ni、Cr、Co、Al的主要赋存矿物,且都是以类质同象的形式代替Fe元素形成的固溶体矿物,该矿物也是后期Ni、Fe分离的目的矿物。 相似文献
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对微波加热国产低品位锰矿含碳球团冶炼硅锰合金进行试验研究,探明了还原剂种类、配碳系数、碱度等对锰元素回收率的影响。结果表明,采用微波加热含碳低品位锰矿球团可以冶炼出硅锰合金。以木炭为还原剂时,锰回收率可达63.3%,冶炼效果明显优于兰碳。配碳系数及碱度对冶炼效果有明显影响,最佳配碳系数为1.3,最佳碱度为0.7。通过混合高品位锰矿的方式,提高混合锰矿中锰含量,对锰元素回收率没有明显影响。 相似文献