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对低品位硼铁矿碳热还原分离铁硼进行了热力学分析,分析结果表明:1 500℃以下硼铁可以通过选择性还原进行分离,矿石中的氧化物杂质对其没有影响。按化学当量C/O=1配碳,进行了差热及马弗炉焙烧实验。实验结果表明:由于该矿本身相互嵌布特点,焙烧温度在1 200℃以下时硼铁分离效果不好。焙烧温度过高选后硼铁精矿粉品位变化不大,能耗增大。因此,最佳的焙烧温度为1 200~1 350℃,在此温度下能使硼铁分离,铁硼精矿粉品位分别达到80%和12%以上。实现了低品位硼铁矿的综合利用。
The thermodynamic analysis of iron-boron separation by carbothermal reduction of low-grade ferroboron was carried out. The results showed that the ferroboron below 1 500 ℃ could be separated by selective reduction, and the oxide impurities in the ore had no influence on it. According to chemical equivalent C / O = 1 with carbon, the differential heating and muffle furnace roasting experiments. The experimental results show that due to the mutual imbibition of the ore itself, the separation of boron and iron is not good when the calcination temperature is below 1 200 ℃. After the bake temperature is too high, the grade of boron iron ore concentrate changes little, and the energy consumption increases. Therefore, the optimum calcination temperature is 1 200 ~ 1 350 ℃, and the ferroboron can be separated at this temperature. The grade of Fe-B concentrate reaches 80% and 12% respectively. Achieve the comprehensive utilization of low grade boron iron ore.