硼铁精矿焙烧过程反应活性研究
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摘要
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 atmosphere 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 characterized by using X ray diffraction.The results showed that the reaction 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 2h.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 concentrate in the CO_2-soda method.
With boron-iron ore concentrate as raw material,the effects of calcining temperature,calcining time,calcining atmosphere 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 characterized by using X ray diffraction.The results showed that the reaction 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 2h.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 concentrate in the CO_2-soda method.
引文
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[2]申军.国内外硼矿资源及硼工业发展综述[J].化工矿物与加工,2013,(3):38-42.
[3]胡伟,杨晓军,符寒光.含硼矿中硼的提取工艺技术现状及趋势[J].有色金属科学与工程,2015,6(6):65-69.
[4]An J,Xue X X.Life cycle environmental impact assessment of borax and boric acid production in China[J].Journal of Cleaner Production,2014,66:21-127.
[5]刘宏伟,仲剑锋,于天明,等.提高翁泉沟硼铁矿反应活性的工艺研究[J].无机盐工业,2008,40(4):21-24.
[6]Wang G,Wang J S,Yu X Y,et al.Innovative method for boron extraction from iron ore containing boron[J].International Journal of Minerals,Metallurgy and Materials,2016,23(3):247-255.
[7]刘然,薛向欣,黄大威.硼铁矿氧化焙烧失重及机理探讨[J].钢铁,2007,29(4):9-1.
[8]李杰,郭学东,姜涛.钙化焙烧对富硼渣活性的影响研究[J].化工矿物与加工,2015,(3),20-23.
[9]余建文,韩跃新,高鹏.含硼铁精矿还原过程中硼矿物的热力学行为[J],中国有色金属学报,2015,25(7):1 969-1 977.
[10]赵庆杰,何长清,高明辉.硼铁矿综合利用-硼精矿活化焙烧及含硼铁精矿改善烧结球团性能的机理[J].华东冶金学院学报,1997,14(3):262-266.