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采用自制热处理装置对宜洛结核状煤系黄铁矿进行热处理,热处理温度200~800℃,氮气流量0.1 L/min,保温时间10 min.试验结果表明:热处理温度为700℃时煤系黄铁矿比磁化率达到最大值,与未热处理试样相比提高两个数量级以上,煤系黄铁矿失重速率较大的温度段与其磁性显著增强的温度段基本一致,证明煤系黄铁矿的热分解是其磁性增强的主要原因;XRD分析结果表明600℃时试样中有磁黄铁矿生成,700℃时试样中黄铁矿完全转变为磁黄铁矿;热处理温度与煤系黄铁矿比磁化率之间符合高斯曲线的函数关系.
The heat treatment was carried out at a temperature of 200 ~ 800 ℃, a nitrogen flow rate of 0.1 L / min and a holding time of 10 min by means of a self-made heat treatment device. The results show that when the heat treatment temperature is 700 ℃, The ratio of magnetic susceptibility reaches the maximum value, which is more than two orders of magnitude higher than that of the untreated sample. The temperature range where the rate of weightlessness of coal pyrite is relatively large is basically consistent with the temperature range whose magnetic property is significantly enhanced. Thermal decomposition is the main reason for its magnetic enhancement. The results of XRD analysis show that pyrrhotite is formed in the sample at 600 ℃, and the pyrite in the sample completely changes to pyrrhotite at 700 ℃. Iron ore magnetic susceptibility between Gauss curve in line with the functional relationship.