辽宁某粗铁精矿提铁降硅试验研究

发布时间：2018-06-19 17:40

本文选题：铁矿 + 细筛试验　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：国内铁精矿的TFe含量较低,SiO2含量却很高,一般在5%-11%左右。高SiO2会造成烧结矿铁品位低,入高炉炉料铁的品位上不去,对高炉的利用系数的提高有很大的影响。此外,铁精矿中高含量的SiO2是造成高炉炼铁高焦比、高渣比、产量低、效益低的根本原因。通过对矿物的工艺矿物学研究和化学多元素分析,结果表明,该矿样的TFe含量为62.95%,SiO2含量为11.41%,含有少量的Al2O3、CaO和MgO,磁铁矿的占有率达97.48%。通过对原矿进行筛分条件试验,筛下产品与原矿进行磁选条件试验,获得铁品位为70.21%,铁回收率为86.79%。对筛上产品与磁选中矿进行了细磨—磁选试验和反浮选试验,制定了药剂制度为NaOH500g/t、DF500g/t、CaO400g/t、MD400g/t,确定了开闭路试验采用一粗二扫的浮选工艺流程。通过对五种结构的工艺流程进行了试验比较,最终选择了细筛—联合磁选—筛上与中矿细磨—反浮选流程。对其产品指标进行了测定,获得了TFe含量为69.96%,Si02含量为2.82%,铁回收率为98.43%的铁精矿,可以满足工业要求指标。
[Abstract]:The TFE content of iron concentrate in China is relatively low, but the content of SiO2 is very high, which is about 5- 11%. High Sio _ 2 will cause the low grade of iron in sinter, but the grade of iron in blast furnace feed will not be removed, which has a great influence on the increase of utilization coefficient of blast furnace. In addition, the high content of Sio _ 2 in iron concentrate is the fundamental cause of high coke ratio, high slag ratio, low output and low benefit in blast furnace ironmaking. The results show that the TFE content of the mineral sample is 62.95 and the content of SiO2 is 11.41%, with a small amount of Al _ 2O _ 3 Cao and MgO, and the occupancy of magnetite is 97.48%. Through screening condition test of raw ore and magnetic separation test of sieve product and raw ore, the iron grade is 70.21 and the iron recovery rate is 86.79. Fine grinding and magnetic separation tests and reverse flotation tests were carried out on the sieve products and magnetic separation intermediates. The reagent system was established as NaOH500g / t DF500g / tF500g / t CaO400g / tMD400g / t, and the open and closed circuit test with one coarse and two sweep flotation process was determined. The process flow of fine sieve combined magnetic separation-sieve and fine grinding and reverse flotation of middle ore was selected by comparing the technological process of five structures. The content of TFE is 69.96% and the content of SiO2 is 2.82%, and the recovery rate of iron is 98.43%, which can meet the requirements of industry.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD951

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