摘要
硫磷元素是镍铁生产过程中必须控制的有害元素。缅甸达贡山镍铁冶炼厂选择了国际通用的RKEF镍铁冶炼工艺路线,在近半年的试生产阶段,合金品位经历了四个比较稳定的阶段。本文在整理分析试生产阶段数据的基础上,重点分析焙烧和熔炼两个工序,利用平衡的手段,研究硫磷元素的分配规律和富集情况,并讨论分析了工艺条件对脱除硫磷杂质元素的影响,得出了如下结论:在采用RKEF冶炼镍铁的工艺中,对焙砂S、P水平影响较大的因素依次为燃煤、烟尘粒和干矿,干矿对焙砂含S、P的平均贡献率分别为23%、84%;燃煤对于焙砂在S、P元素上富集的影响波动较大、平均贡献率为46%和8.9%;烟尘粒料的配入比例对焙砂含S有着较大影响,对P的水平影响不大。焙砂的S、P元素水平决定了熔炼工序中总的S、P水平,合金带入S、P水平受合金生产工艺条件影响很大,炉渣碱度越高越有助于脱除S、P,还原度越高(氧势越低)越有助于脱S,碱度对于脱P的影响大于还原度。
Sulfur and phosphor are impurities which must be controlled during the Fe-Ni production. Myanmar Da- gaung Taung Fe-Ni smelter adopts the RKEF process which is accepted widely in the world. The alloy grade has gone through four relatively stable sections during the nearly half year of trial commissioning period. Based on the trial commissioning data, the paper focuses on the calcining and smelting process, uses the mass balance method to analysis the concentrating regulation of the S ＆ P, and discusses the smelting process condition＇s effect for the de- S and de-P. The result are following： pulverized coal, agglomerates and ores are the first three critical factors for the S ＆ P content in the calcine in Ni-Fe smelting process, nearly 23% of S and 84% of P in the calcine come from the ore ; the S ＆ P concentrating in the calcine was greatly influenced by the pulverized coal , average 46% of S and 8.9% of P in the calcine come from the pulverized coal; the ratio of agglomerate and mix feed play a critical role in the S content in the calcine. The impurity content in calcine determines the total impurities for the smelting process, the S ＆ P content in the Fe-Ni are influenced strongly by the process condition, the higher basicity is beneficial for de-S and de-P, the higher reduction grade（lower oxygen potential） is beneficial for the de-S, and the basicity makes more influence than the oxygen potential for the de-P in the smelting process.
出处
《中国有色冶金》
CAS
2014年第2期22-28,共7页
China Nonferrous Metallurgy
关键词
镍铁冶炼
硫
磷
富集规律
还原度
炉渣碱度
Fe-Ni smelting
sulfur
phosphor
concentrating regulation
reduction grade
slag basicity
