固阳褐铁矿磁化焙烧-磁选扩大实验研究
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摘要
针对铁品位32.79%、磁性率(FeO/TFe)5.49%的固阳难选褐铁矿,进行了回转窑磁化焙烧-磁选扩大实验。采用SEM和XRD对原矿物性结构及成分以及磁化焙烧过程中的物相演变进行了分析。通过单因素实验和正交实验确定了最佳工艺指标以及不同因素对实验结果的影响程度。结果表明,原矿在焙烧温度750℃、配煤量7%、焙烧时间40 min条件下焙烧,所得焙烧矿通过阶段磨矿、阶段磁选可获得铁品位61.62%、铁回收率82.54%的铁精矿。
An expanded experiment was conducted for refractory limonite grading 32.79% Fe with a FeO/TFe ratio at 5.49% from Guyang city by using a process consisting of magnetizing roasting in a rotary kiln and magnetic separation.The phase structure and compositions of minerals and mineral phase variation during the magnetizing roasting process were analyzed with SEM and XRD.A single factor test and an orthogonal test were conducted for determining the optimum process conditions and investigating effects of different factors on test results.It is shown that the obtained roasted ore,which was obtained from a roasting process at 750 ℃ for 40 min by adding 7% of coal,was subjected to staged grinding and staged magnetic separation,resulting in an iron concentrate grading 61.62% Fe at a recovery of 82.54%.
An expanded experiment was conducted for refractory limonite grading 32.79% Fe with a FeO/TFe ratio at 5.49% from Guyang city by using a process consisting of magnetizing roasting in a rotary kiln and magnetic separation.The phase structure and compositions of minerals and mineral phase variation during the magnetizing roasting process were analyzed with SEM and XRD.A single factor test and an orthogonal test were conducted for determining the optimum process conditions and investigating effects of different factors on test results.It is shown that the obtained roasted ore,which was obtained from a roasting process at 750 ℃ for 40 min by adding 7% of coal,was subjected to staged grinding and staged magnetic separation,resulting in an iron concentrate grading 61.62% Fe at a recovery of 82.54%.
引文
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[2]谢兴中,王毓华.褐铁矿选矿研究现状与思考[J].金属矿山,2010(1):6-10.
[3]张汉泉.难选赤褐铁矿焙烧-磁选试验研究[J].中国矿业,2006,15(5):44-48.
[4]李保卫,韩磊,李解.褐铁矿微波还原焙烧-磁选单因素实验研究[J].矿冶工程,2015,35(5):99-102.
[5]Youssef M A,Morsi M B.Reduction roast and magnetic separation of oxidized iron ores for the production of blast furnace feed[J].Canadian Metallurgical Quarterly,1998,37(5):419-428.
[6]张敏.攀西某铁矿选矿试验研究[J].矿冶工程,2017,37(1):57-59.
[7]张双爱,王晓斌,王友胜.某低品位铁精矿提质降杂试验研究[J].矿冶工程,2016,36(6):53-56.
[8]朱德庆,赵强,邱冠周.安徽褐铁矿的磁化焙烧-磁选工艺[J].北京科技大学学报,2010,32(6):713-718.
[9]Li J,Li B,Han J,et al.A Comparative Study on the Reduction Mechanism of Fe2O3,Under Different Heating Methods[J].JOM,2014,66(8):1529-1536.
[10]唐立靖,唐云,梁居明.高铝高硅褐铁矿钠化焙烧-磁选试验研究[J].矿冶工程,2015(2):117-119.
[11]刘瑞江,张业旺,闻崇炜.正交试验设计和分析方法研究[J].实验技术与管理,2010,27(9):52-55.
[12]Li G,Yu S,Yang X S,et al.Study on Extraction Technology for Chlorogenic Acid from Sweet Potato Leaves by Orthogonal Design[J].Northern Horticulture,2011,8(1):403-407.