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Formation conditions of uraninite and mineralogical analysis in uranium-containing wastewater

CUI Chun-long;LI Qiang;ZHANG Dong;WANG Xiao-li;WU Tao;ZHANG Ling;YI Fa-cheng;School of Civil Engineering and Architecture,Southwest University of Science and Technology;School of Environment and Resources,Southwest University of Science and Technology;China Academy of Engineering Physics;School of Life Science and Engineering,Southwest University of Science and Technology;National Defense Key Discipline Lab of Nuclear Waste and Environmental Safety,Southwest University of Science and Technology;  
Except for the formation conditions research of natural and synthetic uraninites for searching for mines,there is no report about the forming conditions research of uraninite for the processing of uranium-containing wastewater.In order to meet the needs of the processing of uranium-containing wastewater,on the basis of the research results of the uraninite's formation,this paper discusses the formation of uraninite and its mineralogical analysis in the wastewater system of the like uranyl nitrate solution under the low temperature physicochemical conditions to provide a new method for theprocessing of uranium-containing wastewater.The experimental results show that in the uranyl nitrate solution(instead of the uranium-containing wastewater),the acidic and reductive conditions are in favour of the formation of uraninite.Under low temperature,only under acidic conditions,uraninite can form,but under high temperature,under acidic and weak alkalic conditions,uraninite can form.The higher the temperature and the lower the Eh value,the faster the speed of the uraninite'formation.The main chemical compositions of the uraninite are UO2 and UO3,whose cell parameters are in the range of 0.5406~0.5439 nm.With the increase of the temperature,the uranium content of uraninite is increases,the crystallinity is better,and the cell parameters are larger.The forming uraninite aggregates are mainly spherulitic.
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