恩施高磷鲕状赤铁矿煤基直接还原的试验

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摘要为最大限度地利用恩施黑石板地区的铁矿资源，先通过XRD、扫描电镜、金相显微镜等手段研究了它的矿相组成和结构，得知其主要成分是赤铁矿和石英，矿的显微结构以鲕粒群簇为主，鲕粒中赤铁矿与磷灰石呈环带状分布。矿相结构决定了用一般的选矿方法分离铁、磷非常困难，为此用实验室煤基直接还原法研究了还原温度、还原时间、煤种、添加剂、磁选工艺等对精矿中铁品位和铁回收率的影响规律，得到了提高还原率的合理工艺参数：以哈密煤为还原剂，焙烧还原温度1573K，还原时间40min，一段磨矿时间15min，磁场强度280kA/m。采用此工艺可使精矿产率、铁品位、铁回收率分别达到43.21%、 95.77%和92.18%，磷品位由0.76%降至0.097%。该研究为该地区高磷鲕状赤铁矿工业化的开发利用提供了依据。

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	唐海燕

关键词 ：高磷鲕状赤铁矿, 煤基直接还原, 铁品位, 回收率

Abstract：To maximize the use of the iron ore resources in Heishiban region of Enshi, its mineralogical composition and structure were investigated by the means of XRD, scanning electron microscopy and optical microscopy. The results show that its main compositions are hematite and quartz, and hematite and apatite in oolitic particles are distributed in the zonal shape, which decides the separation of iron and phosphorus difficult. So, the method of coal-based direct reduction was adopted in the laboratory to reveal the effect of reduction temperature and time, coal type, additives, and magnetic separation process on the iron grade and recovery rate. The reasonable process parameters were obtained as follows: Hami coal as a reductant, 1573K of roasting reduction temperature and 40min of reduction time, and 15min of grinding time and 280kA/m of magnetic intensity. This process allows 43.21% of concentrate yield and 95.77% of iron grade as well as 92.18% of recovery rate. In addition, the phosphorus grade can be reduced from 0.76% to 0.097%. This research provides a basis for the industrial exploration and utilization of high phosphorus oolitic hematite.

Key words： high phosphorous oolitic hematite coal-based direct reduction iron grade recovery rate

收稿日期: 2012-11-01 出版日期: 2013-08-19

引用本文:

唐海燕，李京社，孟文佳，宋延琦. 恩施高磷鲕状赤铁矿煤基直接还原的试验[J]. 钢铁, 2013, 48(8): 9-13. TANG Hai-yan,,LI Jing-she,,MENG Wen-jia,SONG Yan-qi. Experimental Research on Coal Based Direct Reduction of High Phosphorous Oolitic Hematite in Heishiban Region of Enshi. Iron and Steel, 2013, 48(8): 9-13.

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http://www.chinamet.cn/Jweb_gt/CN/ 或 http://www.chinamet.cn/Jweb_gt/CN/Y2013/V48/I8/9

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