(1. 中南大學 資源與安全工程學院，長沙 410083；
2. 中南大學 國家金屬礦安全科學技術(shù)研究中心，長沙 410083)
摘 要: 介紹一種新的測試硫化礦樣氧化自熱性質(zhì)的方法。該套實驗裝置由程序控溫箱、金屬網(wǎng)籃、熱電偶以及溫度自動記錄儀等構(gòu)成。通過設置不同的恒溫條件，運用該套實驗系統(tǒng)首次測試3種不同硫化礦樣的氧化自熱性質(zhì)，得出各礦樣在不同恒溫條件下的自熱規(guī)律；利用交叉點溫度法解算出3種礦樣(硫鐵精礦、高硫精礦、原礦)的表觀活化能分別為13.736 6、21.381 7、36.235 0 kJ/mol，比較3種礦樣的自燃傾向性。結(jié)果表明：隨著恒溫溫度的升高，礦樣的自熱幅度變大，溫度交叉的速度變快；硫鐵精礦的表觀活化能最小，原礦的表觀活化能最大，這與硫精礦更容易發(fā)生自燃的現(xiàn)象一致。與傳統(tǒng)的研究硫化礦石氧化自熱性質(zhì)的實驗方法相比，該方法的測試成本低、操作簡便、可重復性強，用于判定硫化礦石的自燃傾向性有一定的適用性。
關(guān)鍵字: 硫化礦；硫鐵精礦；高硫精礦；交叉點溫度法；氧化自熱；表觀活化能；自燃傾向性
sulfide ore samples
（1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;
2. National Research Center of Safety Science and Technology for Metal Mines,
Central South University, Changsha 410083, China）
Abstract:A new experimental method to test the oxidation and self-heating properties of sulfide ore samples was introduced. This test system is composed of procedure temperature-controlled chest, wire-mesh basket, thermoelectric couples, and auto-recording thermometer. By changing the constant temperature conditions, three sulfide ore samples were tested for the first time by this new method. The self-heating law curves at different temperatures were gained, and the corresponding apparent activation energies of three samples (iron sulfide concentrate, high-sulfur concentrate and original ore) were calculated by crossing-point temperature method, which were 13.736 6, 21.381 7 and 36.235 0 kJ/mol, respectively; moreover, the spontaneous combustion tendencies of these samples were compared. The results show that with increasing constant temperature, the self-heating range of samples increases, and the temperature crosses more quickly; the apparent activation energy of the sulfur iron concentrate is the least, while that of original ore powders is the largest, which is consistent with the phenomenon that sulfide concentrate cause spontaneous combustion more easily. Compared with the traditional test device, this new experimental method has some advantages of low test cost, convenient operation and good operation repeatability, so it is suitable for evaluating spontaneous combustion tendency of sulfide ores.
Key words: sulfide ore; iron sulfide concentrate; high-sulfur concentrate; crossing-point temperature method; oxidation and self-heating; apparent activation energy; spontaneous combustion tendency
