摘要
熔盐电解法是原位利用月壤制备氧气的可行路径,研究月壤在熔盐中的溶解行为具有重要意义。本文采用等温饱和法研究NEU-1月壤仿真样在冰晶石熔盐体系中的溶解能力,并对冷却后熔盐样品进行XRD与SEM-EDS分析。结果表明:NEU-1月壤仿真样的溶解平衡时间为2 h。在过热度5℃、分子比2.2的冰晶石熔盐中,NEU-1月壤仿真样的溶解度为27.88%,溶解后的饱和溶液中Al_(2)O_(3)、SiO_(2)、TFe、TiO_(2)等氧化物的质量分数分别为4.99%、13.60%、0.55%和0.75%。随着过热度和分子比升高,NEU-1月壤仿真样的溶解度降低。熔盐上清液急冷后的主要物相为Na_(3)AlF_(6)、SiO_(2)、Al_(2)O_(3),熔盐底部冷却后所得黑色物质的主要物相主要为Fe_(3)O_(4)、CaF_(2)、MgSiO_(3)、NaAlSiO_(4)。NEU-1月壤仿真样的溶解过程主要以化学溶解为主,其机理是复合氧化物在氟离子作用下分解为简单氧化物。
It is feasible to extract oxygen from lunar soil by molten salt electrolysis,and it is significant to investigate the dissolution behavior of lunar soil in molten salt.In this paper,the solubility of NEU-1 lunar soil simulant in cryolite molten salt was studied by isothermal saturation method.The results show that the equilibrium dissolution time of NEU-1 lunar soil simulant is 2 h.The solubility of NEU-1 lunar soil simulant in cryolite molten salt with superheat of 5℃and molecular ratio of 2.2 is 27.88%,and the mass fractions of Al_2O_3,SiO_2,TFe and Ti O_(2)in the saturated solution are 4.99%,13.60%,0.55%and 0.75%,respectively.With the increase of superheat and molecular ratio,the solubility of NEU-1 lunar soil simulant decreases.The main phases of molten salt supernatant after quick cooling are Na_3AlF_6,SiO_(2)and Al_2O_3.The main phases of black substances at the bottom of cooled molten salt are Fe_3O_4,CaF_2,MgSiO_(3)and NaAlSiO_4.Chemical dissolution is the main dissolution process of NEU-1 lunar soil simulant,and the mechanism is that complex oxides are decomposed into simple oxides under the action of fluoride ions.
作者
张元坤
刘爱民
张杰
刘风国
胡宪伟
石忠宁
ZHANG Yuan-kun;LIU Ai-min;ZHANG Jie;LIU Feng-guo;HU Xian-wei;SHI Zhong-ning(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral,Ministry of Education,Northeastern University,Shenyang 110819,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2023年第12期4189-4200,共12页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(52004062)。
关键词
月壤
冰晶石熔盐
溶解度
等温饱和法
lunar soil simulant
molten cryolite
solubility
isothermal saturation method
