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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第8期    总第276期    2017年8月

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文章编号:1672-7207(2017)08-2180-07
基于低温氮实验的硫化矿石吸附性能及其孔隙结构特征
阳富强,黄贤煜

(福州大学 环境与资源学院,福建 福州,350116)

摘 要: 为揭示硫化矿石吸附孔的分形特征,采集国内某铜矿矿样进行低温氮吸附实验。利用QuadraSorb SI系列比表面测定仪分析粒径分别为0.300,0.125和0.088 mm 3种矿样的孔隙特征;运用FHH模型计算出各个矿样的分形维数,进一步分析硫化矿样的气体吸附能力与孔隙参数、分形维数之间的关系。研究结果表明:硫化矿样粒径越小,矿样微孔的比表面积和孔体积越大;硫化矿样对气体吸附一般发生在孔径为3~4 nm的微孔上;分形维数增大,微孔含量随之增高,比表面积也相应增大,孔表面则表现越粗糙且趋向于三维空间;分形维数反映了矿样的气体吸附能力,即分形维数与吸附能力具有正相关性。因此,由于硫化矿样粒径减小而引起的复杂孔隙结构及高分形维数,使得矿样更加容易吸附空气中的氧气而发生氧化自燃。

 

关键字: 硫化矿石;粒径;低温液氮吸附;孔隙;分形维数;吸附能力;氧化自燃

Adsorption properties and pore structures of sulfide ores based on low temperature nitrogen experiment
YANG Fuqiang, HUANG Xianyu

College of Environment and Resources, Fuzhou University, Fuzhou 350116, China

Abstract:In order to uncover the fractal characteristics of adsorption-pores of sulfide ores, representative samples were collected from Dongguashan Copper Mine to carry out the low temperature nitrogen adsorption experiment. The QuadraSorb Si specific surface area and pore size distribution analyzer were used to analyze the characteristics of different pore sizes (0.250, 0.125 and 0.088 mm in diameter, respectively). FHH (Frenkel-Halsey-Hill) model was performed to calculate their fractal dimensions; the relationship between gas adsorptive capacity of sulfide ores and its pore structure parameter & its fractal dimension and further was analyzed. The results show that the smaller particle size of sulfide ores is associated with the larger microporous specific surface area and pore volume; gas adsorption on sulfide ores generally occurs in the micropores varying from 3 nm to 4 nm and the higher the fractal dimension, the more the micropore. The specific surface area becomes larger accordingly, and the pore surface is rougher and tends to three-dimensional space. The value of fractal dimension indicates the adsorptive capacity of samples, and the fractal dimension is positively correlated with the adsorptive capacity. Therefore, the high fractal dimension and the complex pore structures caused by the decrease of smaller particle size of sulfide ores can lead to the great possibility of oxidation and spontaneous combustion.

 

Key words: sulfide ores; particle size; low temperature nitrogen adsorption; pore; fractal dimension; adsorption capacity; oxidation and spontaneous combustion

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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