硫化矿石氧化性的分形表征  

Fractal characterization of the oxidation of sulfide ores

作　　者：刘辉[1] 吴超[1] 崔燕[1] 汪发松[1] 

机构地区：[1]中南大学资源与安全工程学院,国家金属矿安全科学技术研究中心,长沙410083

出　　处：《安全与环境学报》2009年第3期113-116,共4页Journal of Safety and Environment

基　　金：国家“十一五”科技支撑计划项日(2006BAK04B03)

摘　　要：针对硫化矿石吸氧速度常数呈现出的不规则周期性变化特征,通过R/S分析法对其进行分析。结果表明,在试验条件下,6种矿样吸氧速度常数的时间序列均体现出明显的Hurst现象,且Hurst指数均大于0.5;同时通过比较发现,矿样的氧化性与矿石吸氧速度常数的Hurst指数值具有一致性。由此可以看出,通过测定矿石吸氧速度常数并进行R/S分析,比较Hurst指数或分形维D值大小,可以得到矿样的氧化性大小,实现利用分形维对矿石氧化性进行表征,从而代替其他各项繁琐的试验工作。该研究为判断硫化矿石常温下的氧化性提供了新的思路和方法,具有一定的理论意义和应用价值。The present paper takes it as its research objectives to make clear the irregular oxidation of sulfide ore and find the relation between the oxidant activity of the sulfide ore at normal temperatures and H values of Hurst exponent in all six the samples of the typical mines. For the above objectives, careful testing and analysis has been done on the VCOA （velocity constant of oxygen absorption） of the ores. Based on the results of our testing measurements and R/S analysis, it can be suggested that the VCOA of sulfide ores take on some cyclically irregular characteristics. It may imply that there does typical phenomenon of Hurst with the time order of VCOA while H values of Hurst exponent are all bigger than 0. 5 under the laboratory conditions. More exactly speaking, they are equal to 0.961 2, 0.820 6, 0.596 3, 0.907 1, 0.884 4 and 0.999 8, respectively, with Hurst opponents being H6 〉 H1 〉 H4 〉 H5 〉 H2 〉 H3. From what is analyzed above, it can be found that H values are not in conformitywith the Mean value of VCOA （K4 〉 K2 〉 K5 〉 K1 〉 K6 〉 K3）. However, there may underlie a strong consistency between the order of oxidant activity of sulfide ores and the H values of their VCOAs. Therefore, it is possible to disclose the irregular oxidant activity of sulfide ores by testing the VCOA and making R/S analysis on them. Then, comparing H values of Hurst exponent or D values of fractal dimensions may allow us to avoid unnecessary tedious work of laboratory experiments and analysis, such as testing the concentrations of Fe^2 ＋, Fe^3 ＋ and SO4^2-, etc. For the above reasons and some others not mentioned here, the given research can be said somewhat valuable in providing us with a new approach to discerning the oxidant activity of the sulfide ore at normal temperatures, which keeps significant meaning beth from the theoretical point of view and from that of practical application.

关 键 词：矿山安全 硫化矿石 氧化 吸氧速度常数 分形 R/S分析 

分 类 号：TD75[矿业工程—矿井通风与安全]