锆精矿火法冶金作业过程中水洗除硅的工艺研究  

Process of Washing and Silicon Removal for Pyrometallurgical Operation of Zircon Sand

作　　者：刘飞[1] 陈伟东[1] 闫淑芳[1] 白宾[1] 张舒嘉 蒋东民 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051 [2]浙江锆谷科技有限公司,浙江湖州313200

出　　处：《稀有金属》2018年第1期83-87,共5页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51364026,51164023);新世纪优秀人才支持计划资助项目(NCET-13-0847);内蒙古自治区高等学校青年科技英才支持计划项目(NJYT-13-B10)资助

摘　　要：以碱熔分解锆英砂所得到的碱熔料为原料，研究其在水洗过程中液固比和水洗温度对碱熔料除硅效率的影响。通过扫描电子显微镜（SEM）和x射线衍射仪（XRD）分析了碱熔料与水洗料的颗粒形貌以及相结构。研究结果表明：液固比由4：1增长至6：1时，水洗除硅效率由22．8％增长至51．35％。当液固比超过6：1之后，水洗除硅效率不再有明显变化。水洗除硅效率随着水洗温度的升高近乎是线性增加关系。适宜的水洗除硅工艺条件为：液固比为6：1，水洗温度为60℃，此条件下碱熔料的除硅效率达到59．5％。碱熔料中NazSi03和Na4SiO2的衍射峰在水洗后消失，Na2ZrO，的衍射峰宽化且强度减弱。对比碱熔料与水洗料的形貌变化，发现水洗料颗粒松散，无明显团聚现象，有利于后续的转型、酸浸工序的进行。The effects of ratio of liquid to solid and washing temperature on silicon removal were investigated in washing process for alkali fusion decomposition of zircon sand. Particle morphologies, phase structure of the alkali fusion and washing material were ana- lyzed by scanning electron microscope （SEM） and X-ray diffraction （XRD）. The results showed that the efficiency of silicon removal increased from 22.8% to 51.35% when the ratio of liquid to solid increased from 4：1 to 6： 1. The efficiency of silicon removal was no longer obviously changed when ratio of liquid to solid was above 6： 1. The efficiency of silicon removal nearly linear increased with the increase of washing temperature. The optimal of washing and silicon removal conditions were as follows： the ratio of liquid and solid was 6： 1, washing temperature was 60℃, and the efficiency of silicon removal reached 59.5% in this condition. Diffraction peaks of NazSiO3 and Na4SiO4 of alkali fusion material disappeared in process of washing. The diffraction peak of Na2ZrO3 broadened and the intensity weakened. The particles were loose and had no obvious phenomenon of reunion in washing material, which was beneficial to process of transformation and acid leaching step.

关 键 词：碱熔料 水洗 除硅效率 锆精矿 

分 类 号：TG146.4[一般工业技术—材料科学与工程]