给料粒度对悬浮焙烧过程铁矿物反应行为的影响

发布时间：2018-05-28 15:47

本文选题：赤铁矿 + 菱铁矿　；参考：《金属矿山》2016年12期

【摘要】：綦江铁矿石主要有用元素铁含量为35.47%,铁主要以赤铁矿和菱铁矿的形式存在,铁在赤铁矿和菱铁矿中分布率分别为45.45%和51.11%。对磨至不同粒度矿石进行悬浮焙烧—弱磁选试验结果表明,磨矿细度为-0.074 mm占50%时,精矿指标最佳。对磨至-0.074 mm占50%的产品筛析为+0.1、0.074~0.1、0.045~0.074、-0.045 mm 4个粒级,分别进行悬浮焙烧—弱磁选试验。结果表明:给料粒度为0.074~0.1 mm和0.045~0.074 mm时,获得的精矿指标相对较佳。对不同给料粒度焙烧产品的XRD和磁性分析结果表明:+0.1 mm粒级因颗粒粒度较大,反应不完全,仍有部分赤铁矿和菱铁矿因未被还原而存在于还原物料中;0.074~0.1 mm和0.045~0.074 mm粒级焙烧产品中铁矿物主要为磁性较强的磁铁矿;-0.045 mm粒级焙烧产品产生过还原现象,生成了弱磁性的浮氏体。试验结果可以为綦江铁矿石悬浮焙烧工艺优化提供依据。
[Abstract]:The main useful element iron content in Qijiang iron ore is 35.47%, iron mainly exists in the form of hematite and siderite, the distribution rate of iron in hematite and siderite is 45.45% and 51.11% respectively. The test results of suspension roasting and weak magnetic separation for different granularity ores show that when the grinding fineness is -0.074 mm to 50 mm, the concentrate index is the best. The test of suspension roasting and weak magnetic separation was carried out for the product which was ground to -0.074 mm and accounted for 50%. The sieve size was 0.10.74 ~ 0.45 ~ 0.045 ~ 0.074 ~ 0.045 mm and 0.074 ~ 0.045 mm respectively. The results show that when the feed granularity is 0.074 ~ 0. 1 mm and 0. 045 ~ 0. 074 mm, the concentrate index is relatively good. The results of XRD and magnetic analysis of roasted products with different feed granularity show that the reaction is incomplete because of the larger particle size. Some hematite and siderite still exist in the reduction materials because they are not reduced. The iron minerals are mainly magnetite with strong magnetic properties. A weakly magnetic floating body is formed. The test results can provide basis for optimization of suspension roasting process of Qijiang iron ore.
【作者单位】：东北大学资源与土木工程学院;
【基金】：中央高校基本科研业务费重大科技创新项目(编号:N140108001) 国家自然科学基金项目(编号:51674065)
【分类号】：TD951

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