An Experimental Study On Sandstone-type Uranium Ore Dissolution In Dongsheng Uranium Deposit

In this paper, we studied the dissolution behavior of Dongsheng sandstone–type uranium ore in Ordos Basin and used liquid-flow reaction equipment to analyze the impact of some factors in the experiments such as the temperature, the pressure and the water flow or stationary state.During the experiments, the conductivity and pH of the solution were measured with the multiparameter meters, and the concentrate of the elements in solid and solution was determined by X-ray fluorescence spectrometry and ICP-MS.The experimental pressure is 10Mpa, the temperature rang is 50-350℃and the experimental medium was pure water. The experiments are divided into two groups: static blocking experiments and dynamic flow experiments. Through the experimental study of sandstone dissolution behavior, we have(1)tested the experimental sample uniformity and reproducibility of results;(2)summarized the connection between the conductivity and the temperature in the sandtype-stone dissolution and also compared the reaction contents;(3)compared the dissolution rate of reaction of sandstone and with other stress conditions; (4)compared the expertmental samples with other samples in the study area.The experimental results indicated that(1) the experimental samples have good uniformity and the experimental results have good reproducibility;(2)in the static blocking experiments, the electrical conductivity has a fluctuation,while in dynamic flow experiments, electrical conductivity increases with the temperature;(3) after the static blocking experiment, the concentration of Na、K、Al and U have a little diffence between centrifuge solution and not centrifuge solution ,except Ca.the element U gets the maximum concentration at 100℃;(4) in dynamic flow experiments, the main components of the reaction solution is Si,second K、Ca、Al、Mg、Fe and U. the concentration of U first adds and then decreased as the temperature.(5) in dynamic flow experiments,as the temperature increases,the dissolution rate of the element U has first added and then decreased, The dominant solution temperature of U is distinct in different pressures, detailed rules need for further verification.