白云鄂博磁选精矿中磷的赋存状态

doi:10.13228/j.boyuan.issn0449-749x.20170453

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摘要经选矿得到的白云鄂博铁精矿中磷质量分数普遍高于一般铁矿，为了综合利用白云鄂博铁精矿资源，脱除矿中的有害元素磷显得尤为关键，因此，有必要系统地研究白云鄂博铁精矿中磷的赋存状态及嵌布特征。通过测定不同粒级白云鄂博铁精矿的化学成分，研究铁品位、磷质量分数与矿粉粒度之间的相互关系；利用X射线衍射、扫描电镜、能谱仪并辅以自动矿物分析系统确定白云鄂铁精矿的物相组成、含磷矿物与含铁矿物及周围脉石的嵌布关系；并运用图像处理软件Image Pro-Plus对含磷矿物的尺寸进行统计。研究结果表明，随着铁精矿粒度由150～250 μm减小到小于45 μm，铁品位由56.20%升高到67.60%，磷质量分数由0.122%降低到0.044%；矿中磷元素主要以独居石和磷灰石（含氟磷灰石）的形式存在，其中独居石占总磷量的15.38%，磷灰石占总磷量的84.62%，脱除以磷灰石形式存在的磷元素是脱磷的关键；含磷矿物的平均直径为51.66 μm，多被脉石矿物包裹，或与磁铁矿紧密相邻，其周围的脉石矿物主要有碳酸盐类云石矿物、硅酸盐类闪石矿物以及硅铝酸盐类云母矿物；其含磷矿物嵌布关系较为复杂，通过磁选很难将该矿中磷质量分数脱除到一定范围；为磷的脱除奠定了基础。

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	赵伟
	张婧
	罗果萍
	曹斌
	朱建国

关键词 ：白云鄂博磁选精矿, 赋存状态, 脱磷, 物相组成, 嵌布关系

Abstract：The phosphorus content of the Bayan Obo iron concentrate obtained through beneficiation is generally higher than that of the general iron ore.In order to comprehensively utilize the resource of Bayan Obo iron ore concentrate， it is important to remove the harmful element of phosphorus in the ore. Therefore， it is necessary to systematically study the existing state and embedding characteristics of phosphorus in Bayan Obo iron concentrate. The relationship of the iron and phosphorus content versus the particle size of iron ore concentrate was studied by measuring the chemical composition of different ore grades. Moreover， the phase composition， the embedded relationship among the phosphorus-bearing minerals， the iron-bearing minerals and surrounding gangue were determined through. X-ray diffraction， scanning electron microscopy， energy dispersive spectrometer and the automatic mineral analysis system Meanwhile， the particle size of phosphorus-containing minerals were statistically analyzed by the Image Pro-Plus software. The results show that the iron content increases from 56.20% to 67.60% and the phosphorus content decreases from 0.122% to 0.044%， as the iron ore concentrate size decreases from 150-250 μm to less than 45 μm. The phosphorus element in the ore exists in the form of monazite and apatite （including fluorine apatite）， and monazite accounts for 15.38% of and apatite is 84.62%. Obviously， apatite elimination is the key to dephosphorization. In addition， the average diameter of phosphorus-bearing minerals is 51.66 μm. They are surrounded by gangue or closely adjacent to magnetite. The main gangues are carbonate marble minerals， silicate amphibole minerals and aluminosilicate mica minerals around the phosphorus-containing minerals. The embedded relationship in the phosphorus-containing mineral is complex， and largely reducing the phosphate content through the magnetic separation is difficult. Therefore， the experimental result lays the foundation for the removal of phosphorus from the Bayan Obo magnetic concentrate.

收稿日期: 2017-09-07 出版日期: 2018-06-20

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TF04

引用本文:

赵伟，张婧，罗果萍，曹斌，朱建国. 白云鄂博磁选精矿中磷的赋存状态[J]. , 2018, 53(6): 11-18. ZHAO Wei，ZHANG Jing，LUO Guo-ping，CAO Bin，ZHU Jian-guo. Existing state of phosphorus in Bayan Obo ore magnetic concentrate. Iron and Steel, 2018, 53(6): 11-18.

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