(中南大學 資源與安全工程學院，長沙 410083)
摘 要: 為了研究硫化礦石堆氧化反應過程中溫度場的動態(tài)變化，提出基于實測溫度數(shù)據(jù)重構(gòu)溫度場的新思路。以從某硫鐵礦采集的礦石樣品作為實驗材料，應用自主設(shè)計的實驗裝置，測定模擬礦石堆各測點的溫度變化。在對礦石堆溫度場演化的混沌相關(guān)性進行驗證后，應用實測溫度數(shù)據(jù)進行二維插值，模擬得到礦石堆不同時段的溫度變化曲面。結(jié)果表明：礦石堆內(nèi)通風和蓄熱的綜合作用使得堆內(nèi)溫度分布呈現(xiàn)出顯著的空間差異，且根據(jù)升溫幅度的變化情況，可將礦石堆溫度場的演化大致分為3個階段，在各個階段礦石堆表層一定范圍內(nèi)的升溫幅度始終最大；分析測點平均升溫率與深度的關(guān)系，可確定礦石堆的自熱層厚度約為11.523 3 mm；由于自熱層的升溫幅度明顯大于其他區(qū)域的，在采礦生產(chǎn)中應對該區(qū)域進行重點監(jiān)控。
關(guān)鍵字: 硫化礦石堆；自熱實驗；溫度場；混沌相關(guān)性；二維插值；自熱層；仿真
temperature field
（School of Resources and Safety Engineering, Central South University, Changsha 410083, China）
Abstract: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.
Key words: sulfide ore heap; self-heating test; temperature field; chaotic correlation; two-dimensional interpolation; self-heating layer; simulation
