摘要
采用煤基直接还原-磁选工艺对某高铁锰矿进行铁-锰分离的试验研究。不配加添加剂时磁性产物铁品位为59.42%,锰品位为20.73%;非磁性产物锰品位为48.88%,铁品位为5.91%。为强化铁-锰分离,选择Na2CO3、Na2SO4和Na2S2O3作为添加剂进行还原试验,结果表明3种添加剂在还原过程中都能促进铁-锰分离,且Na2S2O3效果最优。在Na2S2O3用量为5%时,磁性产物的铁品位提高至85.38%,锰品位降低至9.08%;非磁性产物的锰品位提高至54.72%,铁品位降低至2.59%。研究了加入添加剂前后焙烧矿的微观结构和物相转变,结果表明Na2S2O3有利于Mn S和Mn2Si O4的形成并促进了铁晶粒的聚集长大。
Experimental study was conducted on the separation between iron and manganese in one high-iron manganese ore using coal-based direct reduction. Test without any additives resulted in the magnetic product grade of 59.42% Fe and 20.72% Mn, while non-magnetic product grade of 48.88% Mn and 5.91% Fe. For the further separation between iron and manganese, Na2CO3, Na2SO4 and Na2S203 were chosen as sodium additives in reduction. Results showed that three additives all facilitated the Fe-Mn separation, with Na2S203 bringing in an optimum effect. Adding 5% Na2S203, resulted in the magnetic product with Fe grade increased to 85.38% and Mn grade decreased to 9.08%, while non- magnetic product with Mn grade increased to 54.72% and Fe grade decreased to 2.59%. The microstructures and phase transformation of roasted ores were analyzed before and after adding Na2S203, showing that Na2S203 is beneficial for the formation of MnS and Mn2SiO4, as well as the aggregation of iron crystals.
出处
《矿冶工程》
CAS
CSCD
北大核心
2014年第6期85-89,共5页
Mining and Metallurgical Engineering
关键词
高铁锰矿
煤基直接还原
铁锰分离
钠盐添加剂
high-iron manganese ore
coal-based direct reduction
Mn-Fe separation
sodium additives
