论文部分内容阅读
以某含镍1.86%(质量分数)、铁13.24%(质量分数)的红土镍矿为对象,分别采用石煤和无烟煤作为还原剂,考察了煤种对红土镍矿中镍的选择性还原的影响.结果表明,用石煤作为还原剂能够达到镍选择性还原的目的.X射线衍射及扫描电镜分析研究表明,还原过程中镍、铁先以镍纹石形式存在,随着煤用量增加,逐渐变为以铁纹石形式存在.同时随着煤用量的增加,焙烧后生成的含镍铁矿物中镍的比例逐渐递减,而铁的比例逐渐递增.石煤为还原剂时焙烧产物中主要以镍纹石的形式存在,同时金属铁的生成量比无烟煤作还原剂时低,因此采用石煤作还原剂比无烟煤作还原剂对镍还原具有更强的选择性,可以得到更高镍品位的镍铁精矿.
Taking a laterite nickel ore containing 1.86% (mass fraction) nickel and 13.24% (mass fraction) iron as the target, respectively, stone coal and anthracite coal were used as reducing agents to investigate the selective reduction of nickel in nickel laterites from coal .The results show that selective reduction of nickel can be achieved by using stone coal as reductant.The results of X-ray diffraction and scanning electron microscopy show that nickel and iron exist in the form of nickel serpentine during the reduction process.With the increase of the amount of coal, Gradually changed to the form of ironstone.At the same time as the amount of coal increased, the proportion of nickel in the nickel-containing iron ore after calcination gradually decreased, while the proportion of iron gradually increased.Stone coal as a reducing agent roasting products Mainly in the form of nickel serpentine, while the formation of metal iron than anthracite as a reducing agent low, so the use of stone as a reducing agent than anthracite as a reducing agent for nickel reduction has a stronger selectivity, you can get higher nickel Grade of nickel iron ore concentrate.