硼铁精矿焙烧过程反应活性研究

Study on reactive activity of boron-iron concentrate

以硼铁精矿焙烧过程为研究对象,系统考察了温度、时间、焙烧气氛、添加剂等焙烧条件对硼铁精矿反应活性的影响,利用X射线衍射对硼铁精矿焙烧产物的物相组成进行了表征分析,并对反应机理进行了探讨。结果表明,调节焙烧温度、焙烧时间和使用添加剂可有效提高硼铁精矿的反应活性,焙烧气氛对硼铁精矿反应活性影响较小。适宜的工艺条件:焙烧温度为700℃、焙烧时间为2.0h,碳酸钙为添加剂,在此条件下硼铁精矿反应活性可提高到84%。本文研究结果为碳碱法提硼存在的硼铁精矿反应活性不高的问题提供了解决思路。

With boron-iron ore concentrate as raw material, the effects of calcining temperature, calcining time, calcining atmos phere and additives on the activity of boron-iron ore concentrate during the calcining process were studied. The phase composition of the boron-iron ore concentrate calcining product was character- ized by using X ray diffraction. The results showed that the reac- tion activity of boron-iron ore concentrate could be increased effectively by adjusting calcining temperature and calcining time and using additives, but affected slightly by calcining atmosphere. The optimal conditions were determined as calcium carbonate being additive, calcining temperature of 800℃, and calcining time period of 2 h. Under the optimal conditions, the reaction activity could reach as high as 85.0%. The research results in this paper can provide an idea for solution to the problem of the inadequate reaction activity of the boron-iron ore eoncentr.ate in the CO2-soda method.