在热力学分析的基础上，研究了碳热还原硼铁矿过程中硼的还原挥发过程，绘制出了BCO优势区图。结果表明，硼铁矿中硼的失重率随着温度的升高而增大，1 400~1 450 ℃时很快达到最大值，最大失重率为379%。B2O3主要是以B2O2的形式挥发，随炉气挥发出的B2O2在炉管上部又重新生成B2O3，和镁、硅的挥发物一起在炉管口形成白色的粉末附着在炉管壁上。由于铁的存在，另一部分硼和铁在过量碳的条件下形成了FeB合金，以FeB、Fe2B等形式稳定存在于试样中。
Thermodynamic analysis was made to study the reduction volatilization of boron in ludwigite by using carbothermic reduction. Predominance diagram for the BCO system was presented. The experimental results showed that the mass loss rate of boron in ludwigite increases with rising temperature, of which the maximum is 379% in the range from 1 400 to 1 450 ℃. Boron in ludwigite was reduced and volatilized as B2O2 in the carbothermic reduction process. B2O2 was reoxidated into B2O3 in the process of volatilization and the rest together with magnesium/silicon were volatilized and the white powder was formed which was deposited at the opening of furnace tube and adhered to tube wall. Part of boron has stabilized in the form of FeB/Fe2B because of the existence of Fe.
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