机械力作用诱导硫化矿石自燃的微观机理
发布时间：2018-07-14 18:30
【摘要】：为揭示不同强度的机械力作用对硫化矿石自燃的影响机理,从某高硫矿山采集具有代表性的硫化矿样,在室内开展硫化矿石的机械球磨实验。联合运用扫描电镜(SEM)、X线衍射(XRD)等测试技术表征矿样在经历100,200,300,350,400和450 r/min等转速表征的不同强度的机械力作用下的表观形貌、微观结构等的演变规律;进一步开展矿样在不同强度的机械力作用下的恒温恒湿氧化实验,并对比各个矿样的氧化质量增大率。研究结果表明:硫化矿石在经历不同强度的机械力作用后,形成细小的细微颗粒并发生集聚效应;随着转速提高,硫化矿石的晶格畸变率增大,晶粒粒度降低,氧化速率明显加快。这表明硫化矿石在外界不同强度的机械力作用下,其化学反应活性增强,更加容易发生氧化自热,进而在一定环境条件下引发自燃火灾。
[Abstract]:In order to reveal the mechanism of influence of mechanical force of different strength on spontaneous combustion of sulfide ore, the mechanical milling experiment of sulfide ore was carried out in laboratory from a representative sulphide ore sample collected from a high sulfur mine. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and microstructure of mineral samples under the action of mechanical force of different strength such as 100200300350400 and 450 r/min. The experiments of constant temperature and humidity oxidation of ore samples under different mechanical strength were carried out, and the increasing rate of oxidation mass of each sample was compared. The results show that the fine particles are formed and agglomerated by mechanical force of different strength, and the lattice distortion rate of sulfide ores increases with the increase of rotational speed, and the grain size decreases with the increase of rotational speed. The oxidation rate was accelerated obviously. This indicates that the chemical reaction activity of sulphide ore increases under the action of mechanical force of different external strength, and it is more likely to occur oxidation self-heating, and then to cause spontaneous combustion fire under certain environmental conditions.
【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】：TD752.2
本文编号：2122580
[Abstract]:In order to reveal the mechanism of influence of mechanical force of different strength on spontaneous combustion of sulfide ore, the mechanical milling experiment of sulfide ore was carried out in laboratory from a representative sulphide ore sample collected from a high sulfur mine. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to characterize the morphology and microstructure of mineral samples under the action of mechanical force of different strength such as 100200300350400 and 450 r/min. The experiments of constant temperature and humidity oxidation of ore samples under different mechanical strength were carried out, and the increasing rate of oxidation mass of each sample was compared. The results show that the fine particles are formed and agglomerated by mechanical force of different strength, and the lattice distortion rate of sulfide ores increases with the increase of rotational speed, and the grain size decreases with the increase of rotational speed. The oxidation rate was accelerated obviously. This indicates that the chemical reaction activity of sulphide ore increases under the action of mechanical force of different external strength, and it is more likely to occur oxidation self-heating, and then to cause spontaneous combustion fire under certain environmental conditions.
【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】：TD752.2
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，本文编号：2122580
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