硫化矿石堆动态自热过程模拟

摘要

To reveal self-beating characteristics of sulfide ore heap in stope during the oxidation process, ore samples from a pyrite mine were taken as experimental materials and dynamic self-heating process of sulfide ore heap was simulated in laboratory with an experimental apparatus designed by the authors. The results indicate that the relationship between temperature of the ore heap and time accords with characteristics of exponential curve model. The exponential curve model can be used to predict temperature of the ore heap tentatively. Temperature discrete trend of the ore heap includes three stages: relatively stable dispersion, increasing dispersion and decreasing dispersion. During the increasing dispersion stage, ore in local area generates obviously self-heating. Average temperature rising rate increases at first, then decreases with the increase of depth, which shows that there exists a self-heating layer with certain thickness in the ore heap. Ore heap responding to changes of ambient temperature presents spatial difference. Shallow area responds faster and its response effect is more obvious. Deep area responds more slowly, but the duration is longer.%为揭示采场硫化矿石堆氧化过程中的自热特性,以从某硫铁矿采集的矿石样品作为实验材料,应用自主设计的实验装置,室内模拟硫化矿石堆动态自热过程.实验结果表明:矿石堆温度与时间的关系符合指数曲线模型特征,利用该模型可对矿石堆温度进行初步预测；矿石堆温度离散趋势包括相对平稳、离散增大和离散减小3个阶段；在离散增大阶段,局部区域矿石产生明显自热;随着深度的增大,平均升温率呈现先增大后减小的趋势,矿石堆内存在一定厚度的自热层；矿石堆对环境温度变化的响应存在空间差异,其中浅层区域响应快,响应效果明显,深层区域响应慢,但其响应持续时间更长.