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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第2期    总第246期    2015年2月

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文章编号:1672-7207(2015)02-0610-07
硫化矿石堆自热过程复杂度变化趋势
潘伟1, 2,吴超1,李孜军1,李明1

(1. 中南大学 资源与安全工程学院,湖南 长沙,410083;
2. 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,辽宁 阜新,123000
)

摘 要: 为揭示硫化矿石堆自热过程的突变特性,提出一种基于实测温度数据研究矿石堆复杂度的新方法。以某硫铁矿矿石样品为实验材料,应用自主设计的实验装置,室内模拟矿石堆动态自热过程。在对近似熵方法检测动力学结构突变的有效性进行验证后,应用小波技术与近似熵方法对自热过程中矿石堆的复杂度进行定量分析。研究结果表明:矿石堆近似熵在0.61~0.90之间,随着深度的增大,矿石堆复杂度呈先增大后减小的趋势;局部区域的自热过程产生了明显突变,突变温度介于117.6~121.2 ℃之间;矿石堆复杂度变化趋势可分为3个阶段:相对平稳阶段、逐渐增大阶段和逐渐减小阶段。在复杂度逐渐增大阶段,矿石堆局部区域产生了明显自热。

 

关键字: 硫化矿石堆;自热过程;复杂度;突变温度;室内模拟;近似熵;小波技术

Complexity trend of self-heating process of sulfide ore heap
PAN Wei1, 2, WU Chao1, LI Zijun1, LI Ming1

1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Mine Thermo-motive Disaster and Prevention of Ministry of Education,
Liaoning Technical University, Fuxin 123000, China

Abstract:To reveal mutation characteristics of sulfide ore heap during the self-heating process, a new method for complexity research of ore heap based on measured temperature data was proposed. Ore samples from a pyrite mine were taken as experimental materials and dynamic self-heating process of ore heap was simulated in laboratory with the experimental apparatus. The complexity of ore heap during the self-heating process was analyzed quantitatively with wavelet technology and approximate entropy method after the effectiveness of approximate entropy method detecting structural dynamics mutation was validated. The results indicate that the approximate entropy value of ore heap is 0.61-0.90. The complexity of ore heap increases at first, and then decreases as the depth increases. Self-heating process of local area has obvious mutation and the mutation temperature is between 117.6-121.2 ℃. The complexity trend of ore heap includes three stages: relatively stable stage, gradually increasing stage and gradually decreasing stage. In gradually increasing stage, ore in local area generates obvious self-heating.

 

Key words: sulfide ore heap; self-heating process; complexity; mutation temperature; laboratory simulation; approximate entropy; wavelet technology

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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