Beneficiation of High-Aluminium-Content Hematite Ore by Soda Ash Roasting
Beneficiation of High-Aluminium-Content Hematite Ore by Soda Ash Roasting
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DOI：
10.1080/08827501003727030
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发表时间：
2010-05
影响因子：
5
通讯作者：
Guanghui Li;T. Jiang;Mudan Liu;Taihua Zhou;Xiao-hui Fan;Gaunzhou Qiu
中科院分区：
文献类型：
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作者：
Guanghui Li;T. Jiang;Mudan Liu;Taihua Zhou;Xiao-hui Fan;Gaunzhou Qiu
高铝铁矿是典型的难选铁矿之一，磁选浮选工艺不能有效地脱除矿石中的氧化铝。本文提出了加碱焙烧再浸出除铝的新工艺。结果表明，在1000℃焙烧15min，添加14.0%(Wt)，原矿中Al_2O_3含量由8.16%降至2.13%，总铁品位由48.92%提高至63.21%。碳酸钠。用X射线衍射仪、扫描电子显微镜和热力学方法研究了铝铁分离的机理，结果表明，铝在焙烧过程中转化为铝硅酸钠、铝酸钠和刚玉，铝酸钠能被水浸出，铝硅酸钠能被稀酸溶液浸出，而刚玉则留在铁精矿中。
High-aluminium-content iron ore is one of typical intractable iron ores, and magnetic separation and floatation processes are found impracticable to remove alumina from the ore effectively. In this article, a new process, roasting with addition of soda followed by leaching, is developed to remove aluminium from the ore. Results show that Al2O3 content decreases from 8.16% in raw ore to 2.13% in iron concentrate, and total iron grade increases from 48.92 to 63.21% when the ore is roasted at 1000°C for 15 min with the addition of 14.0% (wt.) sodium carbonate. Mechanisms of aluminium–iron separation were studied by using XRD, SEM, and thermodynamic methods, and it is shown that aluminium is transformed into sodium aluminosilicate, sodium aluminate, and corundum during roasting; sodium aluminate is able to be leached by water, so is sodium aluminosilicate by dilute acid solution, while corundum remains in the iron concentrate.