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高爐灰為還原劑對海濱鈦磁鐵礦直接還原焙燒磁選—鈦鐵分離的影響

Effect of blast furnace dust as a reductant on direct reduction roasting for separating titanium and iron in seaside titanomagnetite

  • 摘要: 對高爐灰在直接還原焙燒-弱磁選工藝中用作印尼某海濱鈦磁鐵礦還原劑的可行性及其機理進行研究.結果表明,以螢石為添加劑的條件下,高爐灰可代替煤做還原劑,通過高爐灰與螢石的共同作用,可以在直接還原過程中提高還原鐵粉中鐵的回收率及品位并降低TiO2質量分數,同時回收高爐灰中鐵.三種不同產地高爐灰還原效果的比較表明,高爐灰性質對還原效果有影響.在相同用量條件下,津鑫高爐灰(JX)還原效果最好;在JX高爐灰用量30%、螢石用量10%、焙燒溫度1250℃以及焙燒時間為60 min時,焙燒產物通過兩段磨礦和兩段磁選,最終得到最佳的還原鐵粉中鐵品位為91.28%,TiO2質量分數降至0.93%,包括海濱砂礦和高爐灰中鐵的鐵總回收率達到89.19%.

     

    Abstract: The feasibility and mechanisms of using the blast furnace dust as a reductant in direct reduction-low intensity magnetic separation of Indonesian seaside titanomagnetite were investigated. The results show that the blast furnace dust can be used as an alternative to coal as a reductant under the condition of fluorite as an additive. Under the synergistic effect of the blast furnace dust and fluorite,the recovery and grade of iron in the reduction iron powder can be increased and the content of TiO2 can be decreased at the same time during the direct reduction process. Simultaneously,iron in the blast furnace dust can also be recovered. A comparison of three different kinds of blast furnace dusts indicates that the composition of the blast furnace dust can influence the effect of reduction.Under the same dust dosage,the Jinxin blast furnace dust(referred to as JX) show the best reduction performances. The optimum conditions of roasting reduction are the blast furnace dust dosage of 30%,the fluorite dosage of 10% and reduction at 1250℃ for 60 min. The reduction iron powder,with 91.28% Fe grade,0.93% TiO2 content and 89.19% total iron recovery including iron in the run-of-mine and blast furnace dust,is obtained after the roasted product is processed by using a process of two-staged grinding and two-staged magnetic separation.

     

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