硫化矿石自热过程的分维特性  

Fractal dimension characteristics of self-heating process of sulfide ores

作　　者：潘伟[1,2] 吴超[2] 李孜军[2] 杨月平[3] 

机构地区：[1]辽宁工程技术大学矿山热动力灾害与防治教育部重点实验室,阜新123000 [2]中南大学资源与安全工程学院,长沙410083 [3]南华大学核资源工程学院,衡阳421001

出　　处：《中国有色金属学报》2015年第2期492-499,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51304238);矿山热动力灾害与防治教育部重点实验室基金资助课题(JSK200206)

摘　　要：为揭示硫化矿石自热过程的分形特征,以从现场采集的矿石样品作为实验材料,开展矿石自热特性实验,集成小波技术和分形理论对实测温度数据进行研究。结果表明:仅矿样1、2、3和8出现明显自热现象,自热起始温度分别为136.3、178.5、195.4和200℃,在正常采矿条件下,矿石不易产生自热现象;矿样自热过程具有稳定的关联维数,验证了基于分形理论研究自热过程的可行性;在实验条件基本一致的前提下,随着自热起始温度的增大,矿样自热过程的关联维数逐渐减小,可采用关联维数来定性判断自热倾向性强弱;自热效果明显的矿样,其实验后期的关联维数大于实验前期的值,因此,可根据关联维数的变化特征来判定矿样出现明显自热的可能性,从而可减少重复实验的工作量。To reveal the fractal characteristics of self-heating process of sulfide ores, ore samples from a copper mine were taken as experimental materials, and the self-heating characteristics were measured in laboratory. Furthermore, the measured temperature was studied by integrating wavelet technology and fractal theory. The results indicate that only the ore samples 1, 2, 3 and 8 appear obvious self-heating tendency, and their self-heating initiative temperatures are 136.3, 178.5, 195.4 and 200 ℃, respectively, which mean that they are difficult to show self-heating tendency under normal mining conditions. The correlation dimension of self-heating process of ore samples is stable, meaning that it is feasible to study the self-heating process based on fractal theory. If the experimental conditions are basically consistent, the correlation dimension of self-heating process of ore samples decreases with the increase of he self-heating initiative temperature. So, the correlation dimension can be applied to qualitatively determine the self-heating tendency. For the ore samples appearing obvious self-heating tendency in the experiment, the correlation dimension of the late period is greater than that of the previous period. Therefore, the possibility for obvious self-heating tendency of ore samples can be determined according to the variation characteristics of the correlation dimension, which can reduce the workload of repeated experiments.

关 键 词：硫化矿石 自热过程 小波技术 分形理论 关联维数 自热倾向性 

分 类 号：TD75[矿业工程—矿井通风与安全]