摘要
为了高效浸出花岗岩型铀矿石中的铀,采用黑曲霉两步法和化学氧化联合浸出,研究预培养时间、浸出时间和不同氧化剂及其用量对浸铀效果的影响。结果表明:黑曲霉两步法浸出时,采用预培养36 h的黑曲霉浸铀,浸出时间为72 h时,铀浸出率最高,为59.34%,随着预培养时间和浸出时间的延长,铀浸出率显著下降。加入MnO_(2)、NaClO_(3)和H_(2)O_(2)三种氧化剂对铀浸出率均有不同程度的提高,其中加入2.5%(与矿石质量比)的MnO_(2)时,浸铀效果最佳,铀浸出率最高可达74.09%,与未加氧化剂相比,铀浸出率提高了14.8%。
To high-efficiently recover uranium from granite-type uranium ore,a two-step process by Aspergillus niger coupling with chemical oxidants was applied to investigate the effects of pre-culture time,leaching time,oxidant type and dosage on uranium extraction.The results show that the highest uranium recovery of 59.34%is achieved in 36 hours of pre-culture and 72 hours of leaching time in the two-step process by Aspergillus niger.The uranium recovery decreases significantly with the increase of pre-culture time and leaching time.Addition of each of MnO 2,NaClO_(3) and H_(2)O_(2) results in an increase in uranium recovery.At a dosage of 2.5%MnO 2 by weight of uranium ore,the highest uranium recovery reaches to 74.09%,having an increase of 14.8%compared with the absence of the oxidant.
作者
祖媛媛
李广悦
孙静
李芳艳
王永东
ZU Yuan-yuan;LI Guang-yue;SUN Jing;LI Fang-yan;WANG Yong-dong(Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang 421001,China;Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources,Hengyang 421001,China)
出处
《核化学与放射化学》
CAS
CSCD
北大核心
2021年第2期142-147,I0002,共7页
Journal of Nuclear and Radiochemistry
基金
国家自然科学基金资助项目(51674146)。
关键词
花岗岩型铀矿
黑曲霉
两步法
氧化剂
联合浸出
granite-type uranium ore
Aspergillus niger
two-step method
oxidants
joint leaching
