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以镍冶炼废渣作为二次资源回收有价金属铁、镍、铜,采用球团深度还原焙烧法,通过X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱(EDS)分析了不同碱度下铁、镍、铜的回收指标以及还原产物中金属相的微观形貌和存在形式。结果表明,适当提高碱度可促进金属相的还原生长,同时改善金属相在渣相中的形态结构以利于后续分离回收,而碱度过高导致金属相中夹入杂质。确定1.0为适宜碱度,该条件下得到的金属精选粉产率为40.67%,铁、镍、铜的品位分别为90.09%、0.280%、0.247%,相应的回收率分别为91.04%、56.93%、55.80%,可以实现镍渣中铁、镍和铜的富集回收。
Nickel smelting waste was used as secondary resource to recover valuable metal iron, nickel and copper. Pellets deep reduction roasting method was used to analyze the effect of different alkali Degree of iron, nickel, copper recovery indicators and reduction products in the metal phase morphology and the existence of the micro-form. The results show that proper increase of alkalinity can promote the reduction and growth of the metal phase and improve the morphology of the metal phase in the slag phase to facilitate subsequent separation and recovery. However, the excessively high alkalinity results in the inclusion of impurities in the metal phase. The optimum alkalinity was determined as 1.0, the yield of selected fine powders was 40.67%, the grades of iron, nickel and copper were 90.09%, 0.280% and 0.247%, respectively, and the corresponding recoveries were 91.04% and 56.93, respectively %, 55.80%, can achieve nickel slag iron, nickel and copper enrichment recovery.