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为了评价南芬露天矿矿石的热破碎性，利用点荷载方法，试验研究不同加热温度条件下磁铁石英岩和赤铁石英岩两种矿石强度的变化．结果表明，在加热温度达到４００℃之后，矿石强度明显下降．这一强度变化规律对分析火钻扩孔的可行性很有意义．
In order to evaluate the thermal crushing of the ore in Nanfen open-pit mine, the changes of the strength of two kinds of ores, quartzite and hematite, under different heating temperatures were studied by using point loading method. The results show that after the heating temperature reaches 400 ℃, the strength of ore decreases obviously. This law of strength variation is of great significance for analyzing the feasibility of fire reaming.