为了研究硫化矿石堆氧化反应过程中温度场的动态变化,提出基于实测温度数据重构温度场的新思路.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,测定模拟矿石堆各测点的温度变化.在对矿石堆温度场演化的混沌相关性进行验证后,应用实测温度数据进行二维插值,模拟得到矿石堆不同时段的温度变化曲面.结果表明:矿石堆内通风和蓄热的综合作用使得堆内温度分布呈现出显著的空间差异,且根据升温幅度的变化情况,可将矿石堆温度场的演化大致分为3个阶段,在各个阶段矿石堆表层一定范围内的升温幅度始终最大;分析测点平均升温率与深度的关系,可确定矿石堆的自热层厚度约为11.523 3 mm;由于自热层的升温幅度明显大于其他区域的,在采矿生产中应对该区域进行重点监控.
In order to investigate the dynamic changes of the temperature field of sulfide ore heap during the oxidation reaction process, a new idea for temperature field reconstruction based on measured temperature data was proposed. Ore samples from a pyrite mine were taken as the experimental materials, and the temperature variations of the measuring points of simulated ore heap were measured with an experimental apparatus designed by the authors. The temperature variation of the ore heap in different time sections was simulated by two-dimensional interpolating with measured temperature data after the chaotic correlation of temperature field evolvement of sulfide ore heap was validated effectively. The results indicate that comprehensive effects of ventilation and heat storage make temperature distribution in the ore heap present significant spatial difference and temperature field evolvements of the ore heap can be divided into three stages according to the variation of increasing extent of temperature. The thickness of the self-heating layer is about 11.523 3 mm, which can be determined by analyzing the relationship between the average temperature rise rate and the depth of the measuring points. Because the increasing extent of temperature of the self-heating layer is greater than that of other areas, the self-heating layer is the key monitoring area during the mining process.
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