The Leaching Characteristics Of Uranium And Source Material Research In Daxin Uranium Deposit Of Guangxi

Daxin uranium deposit in Guangxi was the carbonaceous-siliceous-argillitic rocktype uranium deposit. Due to the big scale and the high economic value，it hasalways been the important target of the study of the uranium by geologyworkers.Then they made a lot of geological knowledge and results. But at presentthe point on the uranium ore deposit origin, especially on the understanding of theuranium material source were certain arguments. This paper was based on theNNSF of China"metallogenic material source study of daxin uranium in Guangxi.We can activate the leaching of uranium content in rock and leaching rate throughthe design of uranium leaching experiment The comparison and analysis of uraniumleaching experiment provide experimental evidence for the source of uranium.Wecan take the following understanding and results combining with ore depositgeochemical study:Under25℃normal temperature condition, the leaching quantity of uranium inthe weak acid environment is higher, the surrounding rock samples,containingcalcium fine sandstone of the devonian system and fine sandstone with shale ofCambrian are high leaching of uranium. In weak acid and weak alkali conditions,the leaching rate of Cambrian rock samples were higher than in devonian systemsurrounding rock samples.In90℃heating condition, the leaching rate of uraniumin the weak alkaline environment is relatively higher, leaching amount and leachingrate values of the Cambrian rock uranium are bigger. Overall, uranium content ofthe cambrian rock is higher, and the leaching rate of uranium is higher, surroundingrock of Cambrian system provides a main source of uranium mineralization.According to the characteristics of ore deposit geochemistry, uranium has aclosely associated with organic matter leading to U and Fe2O3, P2O5, Al2O3, K2O,TiO2correlated positively. The correlation coefficients about U and typicalhydrothermal ore-forming elements As, Cu, Mo, Ni, was above0.9. Spider diagramand the REE patterns diagram illustrates of ore and wall rock of trace element and rare earth elements are basically the same. Trace element spider diagram and theREE patterns diagram illustrates of ore and wall rock of trace element and rare earthelements are basically the same, proved the consistency of its source, namelyuranium source mainly comes from the stratum. The experiment shows theCambrian strata is the main source of uranium. There are also other sources ofore-forming materials through distribution patterns of REE ore and the highcorrelation of some elements. Carbon and oxygen isotope research shows that theore-forming fluid was atmospheric precipitation infiltration along the faults mixingand upward migration with the high temperature of deep hydrothermal fluid toshallow and to form low temperature hydrothermal by depressurization.Rich ore stratum of Daxin uranium deposits was the devonian system. Uraniummineralization is controlled by structure and stratum. Uranium ore status wasadsorbing.Wall rock alteration mainly black alteration, silicification and pyritization,hematite and carbonatization.It has a lage time gap of diagenesis-mineralization.Daxin deposit was the U-Mo symbiotic hydrothermal superimposed transformationtype deposit.