基于低温氮实验的硫化矿石吸附性能及其孔隙结构特征

发布时间：2018-04-28 00:36

本文选题：硫化矿石 + 粒径　；参考：《中南大学学报(自然科学版)》2017年08期

【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Quadra Sorb 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。
[Abstract]:In order to reveal the fractal characteristics of adsorption pore of sulfide ore, a copper ore sample in China was collected for nitrogen adsorption at low temperature. The pore characteristics of three kinds of ore samples with diameter of 0.300mm 0.125 and 0.088 mm were analyzed by Quadra Sorb SI series specific surface analyzer, the fractal dimension of each sample was calculated by FHH model, and the gas adsorption capacity and pore parameters of sulphide ore samples were further analyzed. The relationship between fractal dimensions. The results show that the smaller the particle size of sulphide ore is, the larger the specific surface area and pore volume of micropores are, and the gas adsorption occurs on micropores with pore size of 3 ~ 4 nm, and the fractal dimension increases with the increase of pore content. The specific surface area increases correspondingly and the pore surface becomes rougher and tends to three dimensional space; the fractal dimension reflects the gas adsorption capacity of the mineral sample, that is, the fractal dimension has a positive correlation with the adsorption capacity. Therefore, the complex pore structure and high fractal dimension caused by the decrease of the particle size of sulphide ore make it easier for the ore sample to adsorb oxygen in the air and cause oxidation spontaneous combustion.
【作者单位】：福州大学环境与资源学院;
【基金】：国家自然科学基金资助项目(51304051) 福建省自然科学基金资助项目(2016J01224) 福建省高校杰出青年科研人才培养计划项目(83016018)~~
【分类号】：TD912

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