摘要
研究了Na HCO3溶液提取硼精矿熟料中硼的工艺,考察了液固比、Na HCO3用量、浸出温度、浸出时间和搅拌速率对硼提取率的影响.结果表明,最佳提取工艺条件为液固质量比2.1：1,Na HCO3用量为理论用量的150%,反应温度100℃,反应时间1 h,搅拌速率400 r/min,该条件下硼浸出率达92.88%.硼精矿熟料的晶形大多是柱状和扁平状,并有微小颗粒附着其表面;终硼泥为很多小晶体堆叠在一起,与硼精矿熟料相比,终硼泥颗粒变小,因此可用收缩核模型描述硼精矿熟料中硼在Na HCO3溶液中的浸出过程.金云母、遂安石、利蛇纹石和橄榄石是硼精矿熟料的主要物相,而终硼泥出现了Mg CO3和Na2Mg（CO3）2物相,遂安石消失.
Leaching process of B from calcined boron concentrate in Na HCO3 solution was studied. The effects of mass ratio of liquid to solid, sodium bicarbonate consumption, reaction temperature, time and stirring speed on leaching of boron were examined. The results showed that under the optimum conditions of mass ratio of liquid to solid of 2.1：1, sodium bicarbonate consumption of theoretical amount of 150%, leaching temperature of 100 ℃, leaching time of 1 h, stirring speed of 400 r/min, leaching rate of B reached 92.88%. The morphology of calcined boron concentrate is mainly columnar and flat crystal, which is attached with some small particles. The boron sludge is a lot of little crystals that stack together, and the particle size of boron sludge is smaller. Therefore, it is speculated that leaching process of B from calcined boron concentrate in Na HCO3 solution can be described by the shrinking core model. The major phases in the calcined boron concentrate were suanite, lizardite, phlogopite and olivine, and with the suanite phase disappearing, the major phases in the boron sludge were MgC O3 and Na2 Mg（CO3）2.
作者
李玉花
况盛阳
张亦飞
薄婧
刘鹏飞
邓立聪
Yuhua LI;Shengyang KUANG;Yifei ZHANG;Jing BO;Pengfei LIU;Licong DENG(Key Laboratory of Green Process and Engineering, National Engineering Laoratory of Hydrometallurgy Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;Liaoning Shougang Boron Iron Co., Ltd., Dandong, Liaoning 118100, China)
出处
《过程工程学报》
CAS
CSCD
北大核心
2018年第4期710-715,共6页
The Chinese Journal of Process Engineering
关键词
NAHCO3
硼精矿
浸出
终硼泥
形貌
sodium bicarbonate
boron concentrate
leaching
final boron sludge
morphology
