(1. 廣州有色金屬研究院 資源綜合利用研究所，廣州 510650；
2. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 研究硫酸鈉和碳酸鈉對(duì)高鋁鐵礦石還原焙燒鋁鐵分離作用機(jī)理的差異。結(jié)果表明：硫酸鈉或碳酸鈉均可顯著改善高鋁鐵礦石的還原效果，添加硫酸鈉可獲得較好的鋁鐵分離效果，添加碳酸鈉可獲得較高的鐵回收率。碳酸鈉作用下，鐵晶粒較小且與脈石礦物結(jié)合；而硫酸鈉作用下金屬鐵顆粒長(zhǎng)大，與脈石礦物界限分明，解離性能好，后者有利于鋁鐵分離。硫酸鈉存在的還原體系形成新生相S、Na2S和FeS，在體系內(nèi)以液相存在，為Fe2+離子的擴(kuò)散提供液相環(huán)境，降低了Fe2+離子遷移的勢(shì)壘，有利于Fe2+離子的擴(kuò)散，從而為鐵晶粒和鋁硅酸鈉的聚集提供有利途徑；而碳酸鈉存在的還原體系沒(méi)有液相生成，F(xiàn)e2+離子的遷移只能通過(guò)固相擴(kuò)散進(jìn)行，遷移阻力大，因此，鐵晶粒與脈石礦物的界限不及添加硫酸鈉時(shí)的分明。
關(guān)鍵字: 高鋁鐵礦石；硫酸鈉；碳酸鈉；鋁鐵分離
（1. Department of Resource Comprehensive Utilization, Guangzhou Research Institute of Non-ferrous Metals,
Guangzhou 510650, China;
2. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The mechanism difference between Na2SO4 and Na2CO3 on the Al-Fe separation of the high aluminum iron ores was studied. The results indicate that Na2SO4 or Na2CO3 can improve the reduction effect of the high aluminum iron ores. Better Al-Fe separation effect can be obtained when using Na2SO4, and better iron recovery can be obtained when using Na2CO3. The size of metallic iron grains is relatively small, and the grains combine with gangue tightly as Na2CO3 is used. While the metallic iron grains grow large and the boundary between iron grains and gangue minerals is clear when reduced with sodium sulplate, which is benefit for the monomer liberation and obtains better Al-Fe separation effect. The sodium sulplate redox system forms new phases, such as S, Na2S and FeS, and they exist in the system in liquid form, which providing liquid environment for the spread of iron ions, thus decreasing the migration barrier of iron ion, which is benefit for the iron ion spread, and then providing beneficial way for the gathering of iron grains and gangue minerals. While there is no liquid phase forms in the sodium carbonate redox system, and the migration of iron ions is only through solid phase diffusion, then the migration resistance is large, so, the boundary between the iron grains and gangue minerals is less clearer than that of sodium sulphate.
Key words: high aluminum iron ore; sodium sulplate; sodium carbonate; Al-Fe separation
