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对隧道窑直接还原焙烧--磁选法处理低品位难选赤铁矿石进行了探讨,重点研究助还原剂NCP的作用及机理.以煤作还原剂,质量分数为20%,CCO和NCP为助还原剂,质量分数分别为15%和5%,在焙烧温度为1200℃,焙烧时间为8 h的条件下,可以得到铁品位92.61%、铁回收率92.38%的铁精矿.利用X射线衍射和扫描电镜对助还原剂NCP的作用机理进行分析.结果表明NCP可以与原矿中石英发生反应,生成硅钠石和钠长石,破坏原矿结构,使还原性气体更易与赤铁矿接触发生还原反应生成金属铁.
The direct reduction roasting and magnetic separation in tunnel kiln to treat low-grade refractory hematite ore was studied, and the role and mechanism of co-reductant NCP were studied.With coal as reductant, the mass fraction of CCO and NCP As the auxiliary reductant, the mass fraction was 15% and 5%, respectively, and the iron concentrate with the grade of 92.61% and the iron recovery of 92.38% could be obtained under the condition of calcination temperature of 1200 ℃ and calcination time of 8 h. Ray diffraction and scanning electron microscopy. The results show that NCP can react with quartz in the ore to form sodalite and albite, destroy the ore structure and make the reducing gas contact with hematite more easily The reduction reaction produces metallic iron.