固阳褐铁矿磁浮联合与磁化焙烧流程试验研究

发布时间：2018-04-05 21:11

  本文选题：固阳褐铁矿　切入点：选别指标　出处：《内蒙古科技大学》2015年硕士论文

【摘要】：自2008年以来，我国大量进口的铁矿石依存程度已经超过了50%，这是我们国家钢铁工业的经济安全出现的隐患。我们应该深刻的意识到国内储量较大的复杂且难选的铁矿石资源的开发利用有很现实的意义，这是维护国家经济安全的重要战略选择。褐铁矿在全国的储量很大，大部分处于弃之状态，没有得到很好的综合利用。本论文针对内蒙古自治区包头市的固阳褐铁矿进行了试验研究，研究目的是尽力在环保经济的前提下去提高选别指标。 采用XRD、显微分析和化学检测等手段，对原矿及不同段的精矿进行分析，测出原矿全铁品位为32.79%，主要脉石矿物石英含量为31.72%，主要的铁矿物为赤褐铁，其中铁金属的含量占全铁的96.12%。采用磁浮联合与磁化焙烧-弱磁选流程探讨，其磁化焙烧均在无还原剂的情况下采用氮气保护进行的。将原矿经破碎、筛分以及混匀处理到-0.074mm占80.32%作为试验矿样，原矿预先用脉动高梯度磁选机在0.92T强度下进行强磁，然后0.75L的浮选机对磁精矿反浮选。原矿、磁精矿预先在管式电阻炉内进行磁化焙烧到900℃，然后用磁选管进行多段弱磁选。 原矿经高梯度强磁选，其品位提高了10.81个百分点达到了43.60%，对应的回收率为76.79%，对反浮选药剂制度的探索使磁精矿的品位提高了约5个百分点达到了48.59%，其回收率是74.16%。本试验任何矿焙烧均在无还原剂的情况下进行的，没有氮气保护进行原矿的焙烧-弱磁其品位是34.89%、回收率为18.62%，，对原矿进行有氮气保护焙烧-弱磁其品位达到48.79%，回收率是64.47%。用磁精矿在氮气保护下进行磁化焙烧-弱磁其品位达到57.89%，回收率为61.82%，改变弱磁场强经两段磁选其品位提高到60.75%，对应的回收率为58.03%。 本文最后对不加还原剂的磁化焙烧而达到了效果，结合试验过程的现象又查阅了相关文献，给予可能与非氧化还原反应新理论相关联。
[Abstract]:Since 2008, China has imported more than 50 percent of iron ore, which is a hidden danger to the economic safety of our country's iron and steel industry.We should deeply realize that the development and utilization of the complicated and difficult iron ore resources with large domestic reserves is of great practical significance, which is an important strategic choice to safeguard the national economic security.Limonite reserves in the country is very large, most of them are abandoned, and have not been well utilized.In this paper, an experimental study was carried out on Guyang limonite in Baotou City, Inner Mongolia Autonomous region. The purpose of the study was to improve the selection index under the premise of environmental protection and economy.By means of XRD, microanalysis and chemical detection, the total iron grade of the raw ore and the concentrate in different sections are analyzed. The total iron grade of the raw ore is 32.79, the quartz content of the main gangue mineral is 31.72%, and the main iron mineral is red brown iron, of which the iron metal content accounts for 96.12% of the total iron.The maglev combination and magnetization roasting-weak magnetic separation process are discussed. The magnetization roasting is carried out by nitrogen protection without reducing agent.After crushing, sieving and mixing, the raw ore was treated to -0.074 mm (80.32%) as the test sample. The ore was pretreated with a pulsating high gradient magnetic separator at 0.92T strength, and then the flotation machine of 0.75 L was used to reverse flotation the magnetic concentrate.The ore is magnetized and roasted to 900 鈩

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