酒钢镜铁矿磁化焙烧—磁选精矿中镁和锰含量偏高的原因分析
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摘要
酒钢镜铁山式镜铁矿矿物组成复杂,嵌布粒度细微,是一种难选的红铁矿,磁化焙烧—磁选是其较好的分选方法。但生产及研究发现,磁化焙烧—磁选精矿中Mg、Mn含量偏高,降低了其含铁品位。为查明原因,对原矿、焙烧矿、磁选精矿及尾矿进行了详细的微观分析。分析结果表明,原矿中的Mg、Mn元素主要存在于褐铁矿、菱铁矿及其铁白云石之中,极少分布于镜铁矿中;经磁化焙烧之后,大多镜铁矿已经转变成磁铁矿,而菱铁矿、褐铁矿与铁白云石受热分解,生成强磁性的镁、锰、铁尖晶石矿物,因此造成铁精矿中的Mg、Mn元素含量偏高。
Jing Tie Shan type specularite of JISCO(Jiuquan Iron&Steel Co.) is a refractory red iron ore because of its complex composition and subtle dissemination.The process of magnetic roasting and magnetic separation is a feasible method for its beneficiation.But the results of production practice and research showed that the Mn and Mg elements were enriched in concentrate,which had effect on the Fe grade of concentrate.In order to find the causes of the problem,microscopic analysis in detail was proceeded with undressed ore,roasting ore,magnetic concentrate and tailings.The analysis results showed that Mg and Mn elements were mainly found in siderite,limonite and ankerite,but rarely found in specularite.Most of specularite was converted to magnetite,while siderite,limonite and ankerite were converted to spinel mineral,which contained Mg and Mn elements after magnetic roasting.And the spinel mineral became the concentrate with magnetite after magnetic separation,which was the major reason for the high content of Mn and Mg in concentrate.
Jing Tie Shan type specularite of JISCO(Jiuquan Iron&Steel Co.) is a refractory red iron ore because of its complex composition and subtle dissemination.The process of magnetic roasting and magnetic separation is a feasible method for its beneficiation.But the results of production practice and research showed that the Mn and Mg elements were enriched in concentrate,which had effect on the Fe grade of concentrate.In order to find the causes of the problem,microscopic analysis in detail was proceeded with undressed ore,roasting ore,magnetic concentrate and tailings.The analysis results showed that Mg and Mn elements were mainly found in siderite,limonite and ankerite,but rarely found in specularite.Most of specularite was converted to magnetite,while siderite,limonite and ankerite were converted to spinel mineral,which contained Mg and Mn elements after magnetic roasting.And the spinel mineral became the concentrate with magnetite after magnetic separation,which was the major reason for the high content of Mn and Mg in concentrate.
引文
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[3]张志荣,陈洲,周华辉,等.酒钢选烧厂提高磁化焙烧竖炉产质量实践[J].矿冶工程,2012(32):121-123.
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[7]朱德庆,邓秀兰,春铁军,等.某微细嵌布贫赤铁矿石直接还原—弱磁选试验[J].金属矿山,2012(2):60-62.
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[11]罗立群,张泾生,刘千帆.基于酒钢物料的磁化焙烧技术研究与应用[J].矿冶工程,2006,26(S1):49-53.
[12]何威.菱铁矿磁化焙烧-磁选基础研究[D].长沙:中南大学,2012.
[13]罗立群.难选复杂铁矿物流膜磁分选与闪速磁化焙烧新技术研究[D].武汉:武汉理工大学,2006.
[14]Luo Liqun,Huang Hong,Yu Yongfu.Characterization and technology of fast reducing roasting for fine iron materials[J].Journal of Central South University,2012,19(8):2272-2278.
[15]黄红,罗立群.细粒铁物料闪速磁化焙烧前后的性质表征[J].矿冶工程,2011,31(2):61-67.
[2]屈万刚,陈铁军,张一敏.镜铁矿粉矿制粒回转窑磁化焙烧及分选研究[J].矿产保护与利用,2016(6):26-30.
[3]张志荣,陈洲,周华辉,等.酒钢选烧厂提高磁化焙烧竖炉产质量实践[J].矿冶工程,2012(32):121-123.
[4]罗立群,余永富,张泾生.闪速磁化焙烧及铁矿物的微观相变特征[J].中南大学学报,2009,40(5):1173-1175.
[5]任亚峰,余永富.难选红铁矿磁化焙烧技术现状及发展方向[J].金属矿山,2005(11):20-21.
[6]李玉祥,孙毅,杨康,等.模拟流化床气基直接还原赤铁矿粉的试验研究[J].金属矿山,2012(1):77-79.
[7]朱德庆,邓秀兰,春铁军,等.某微细嵌布贫赤铁矿石直接还原—弱磁选试验[J].金属矿山,2012(2):60-62.
[8]阎赞,李丽匣,袁致涛,等.含碳酸盐铁矿石选别技术现状及发展趋势[J].矿产保护与利用,2015(1):69-74.
[9]陈雯,张立刚.复杂难选铁矿石选矿技术现状及发展趋势[J].有色金属(选矿部分),2013(Z1):19-23.
[10]罗立群,管俊芳,曹佳宏.酒钢目前入选粉矿性质研究[J].金属矿山,2007(4):26-29.
[11]罗立群,张泾生,刘千帆.基于酒钢物料的磁化焙烧技术研究与应用[J].矿冶工程,2006,26(S1):49-53.
[12]何威.菱铁矿磁化焙烧-磁选基础研究[D].长沙:中南大学,2012.
[13]罗立群.难选复杂铁矿物流膜磁分选与闪速磁化焙烧新技术研究[D].武汉:武汉理工大学,2006.
[14]Luo Liqun,Huang Hong,Yu Yongfu.Characterization and technology of fast reducing roasting for fine iron materials[J].Journal of Central South University,2012,19(8):2272-2278.
[15]黄红,罗立群.细粒铁物料闪速磁化焙烧前后的性质表征[J].矿冶工程,2011,31(2):61-67.