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采用还原焙烧、磁选工艺流程和粉矿直接入炉焙烧技术,对难选低品位硼铁矿中硼的富集进行了研究.按化学当量比C/O=1(原子比)进行配碳,使用马弗炉进行焙烧实验,在500～1 450℃研究了不同焙烧温度下硼品位和硼回收率的变化.研究结果表明:随着焙烧温度的提高,铁晶颗粒增大,在1 200℃时硼精粉品位达到14.29%,满足硼化工工业对硼品位的要求(ω(B2O3)≥12%);硼回收率在1 200℃以上时能达到90%以上.当焙烧温度在1 350℃以上时,硼的回收率和品位没有太大的变化.焙烧温度选择在1 200～1 350℃为宜,既能实现高的硼回收率,硼品位又能满足硼化工工业的要求.
The enrichment of boron in the refractory low-grade ferroboron was studied by reduction roasting, magnetic separation process and direct roasting of the powder ore.According to the ratio of stoichiometry C / O = 1 (atomic ratio) , The use of muffle furnace roasting experiment, at 500 ~ 1 450 ℃ at different calcination temperature boron grade and boron recovery rate changes.The results show that: with the increase of calcination temperature, the iron crystal particles increase in 1 200 ℃, the grade of boron powder reaches 14.29%, which meets the requirements of boron chemical industry for boron grade (ω (B2O3) ≥12%); the recovery rate of boron can reach more than 90% when it is over 1200 ℃ .When the calcination temperature is 1 350 ℃, the recovery rate and grade of boron are not changed much.The calcination temperature is selected at 1200 ~ 1 350 ℃, which not only can achieve high recovery rate of boron, but also can meet the requirement of boron chemical industry.