低品位硼铁矿中硼的富集

Enrichment of boron in low-grade paigeite

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 refractory low-grade paigeite was researched by the technology of reductive roasting, mag- netic separation, and fine ore direct-to-furnace. Carbon was matched according to the chemical equivalent of C/O= 1 （atom ratio）. Roasting experiments were carried out in a muffle furnace in order to investigated the changes of paigeite grade and recovery in the range of 500 to 1450℃ . The result shows that iron grains increase with raising roasting temperature. The grade of ore concentrate powder can be reached 14.29% at 1 200℃, which can meet the challenges of the paigeite chemical industry （ω（B2O3）≥12%. Over 1200 ℃ the boron recovery can be reached 14.29 %. Little changes in boron grade and recovery take place when the roasting temperature is more than 1350℃. It is concluded that the roasting temperature is determined in the range of 1200 to 1350 ℃, which can not only satisfy high boron recovery, but also meet the requirement of boron grade in the paigeite chemical industry.