升温过程中弱黏煤磁性变化关键因素实验研究
Experimental study on key factors of magnetic change of weakly caking coal during heating
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摘要: 为了研究黄陇煤田弱黏煤在升温过程中磁性变化机制，测定升温过程中煤样的质量磁化率，与同等温度热处理后的烧变煤样对比，将煤在升温中的磁变过程划分为4个阶段，分别针对不同阶段开展弱黏煤的程序升温、工业分析及X射线衍射等实验，探究不同升温阶段导致其磁性变化的关键性因素。结果表明：在常温至200 ℃范围内，煤样质量磁化率由负转正缓慢升高，此阶段影响煤体磁性的主要原因是煤体中显逆磁性的含碳化合物组分由于氧化消耗而下降；在200~350 ℃区间，煤样中微量矿物发生化学反应生成顺磁性更强的物质，致使煤样磁化率急剧上升，平均增长率超过上一阶段10倍；350 ℃后磁化率开始迅速降低，500 ℃后平稳于0点附近，主要矿物内部微粒运动由于随温度的升高而加剧，影响磁畴磁矩的有序排列，升至居里温度时，这种影响达到极限，变化趋于稳定。Abstract: To study the magnetic change mechanism of weakly caking coal during the heating process, the mass magnetic susceptibility of coal samples during the heating process was measured in this paper. Compared with the burnt coal sample after heat treatment at the same temperature, the magnetic change process of coal during heating was divided into four stages. The experiments of programmed temperature rise, industrial analysis and X-ray diffraction of coal were conducted at different stages to explore the key factors that lead to changes in its magnetic properties in different heating stages. The experimental results show that the magnetic susceptibility of the coal sample changes from negative to positive and then slowly rises at room temperature to 200 ℃. The effect on the magnetic properties of the coal at this stage is due to the decrease of the diamagnetic carbon-containing compounds in the coal due to oxidative consumption. At 200 ℃ to 350 ℃, the magnetic susceptibility of the coal sample rises sharply, and the average growth rate is 10 times higher than that of the previous stage. This is because the trace minerals in the coal sample chemically react to produce more magnetic substances. When the temperature exceeds 350 ℃, the magnetic susceptibility begins to decrease rapidly, and the magnetic susceptibility stabilizes near 0 after the temperature is 500 ℃. The possible reason is that with the increase of temperature, the movement of particles inside the mineral intensifies and affects the orderly arrangement of the magnetic domain and magnetic moment. When the temperature rises to the Curie temperature, this influence reaches its limit and the change tends to be stable.
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