硅铝合金真空热法还原硼镁石矿实验研究

Experimental Investigation on Vacuum-Thermal Reduction of Ascharite with Silicon-Aluminum Alloy as Reductant

为了解决低品位硼镁石矿的合理利用问题,首次以硅铝合金为还原剂,应用真空热法还原原理将煅烧后矿石中的游离氧化镁还原为金属镁.正交实验结果表明,最佳还原条件为:还原温度1 453 K、还原时间2.0 h、制团压力35 MPa、还原剂过量系数10%,该条件下镁的还原率可达到63.7%.得到的还原余料可用做生产无碱玻璃球的原料.该工艺对环境无污染,为硼镁石矿的综合利用开辟了一条新途径.

In order to utilize effectively the ascharite mineral which contain low grade 13203, the vacuum-thermal reduction of roasted ascharite to deoxygenize magnesia into magnesium with silicon-aluminum alloy as reductant was experimentally investigated. The orthogonal test results showed that the best conditions for the reduction process are at 1 453 K for 2 h, with briquetting pressure 35 MPa and excess coefficient reductant of 10 % and, as a result, the ratio of reduction is up to 63.7 %. In addition, the residue of the reduction process could be used as raw materials to make non-alkali glass ball. The reduction process is environment friendly, thus finding out a new way to utilize comprehensively ascharite mineral.