Study On Electrochemical Extraction Technology Of Sandstone-type Uranium Exploration Site

Interlayered oxidation type sandstone-hosted uranium deposit is one of the uranium deposits.It is totally blind or concealed,which makes it is difficult to be detected.As one branch of the deep-penetrating geochemistry,the geoelectrochemical method provides a new technical means for the exploration of concealed uranium deposits.This method mainly relies on the external field to remove the surface active metal ions to the special receiving device.By analyzing the electrolytes of the device,the elemental content distribution and combination and the abnormal characteristics are extracted to find out the relationship with the hidden deposit abnormal information,which could achieve the purpose of prospecting.At present,the method is mainly used to find hidden gold,tungsten and tin,copper and other nonferrous metals and precious metals,but relatively few studies have been done on concealed uranium deposits.Based on the theory of geoelectrochemistry,sandstone-type uranium ore has the theoretical basis of geochemical prospecting.This thesis mainly carries out the research of concealed sandstone type uranium deposit exploration by geoelectrochemical method,which analyzes the prospecting anomaly characteristics and the ore-forming indicator elements combination,explain their intrinsic mechanism of geochemical and geological meanings,analyzes the relation between elements combination and ore body space position and the migration law of diffusion.The main obtain are as follows:(1)Based on the simulation of water geochemistry,the existence and migration of uranium in soil and groundwater are summarized in the sandstone-type uranium mining area.It is concluded that the uranium ions in the groundwater and soil above the sandstone-type uranium deposits exist in positively charged Uranyl ions and negatively charged co-anions.Therefore the way of bipolar extract was adopt in the field work.That is extraction of positive and negative electrode adsorption of charged ions.(2)A set of optimal technical parameters are selected,which include extraction voltage,adsorption materials,foam agent,load extraction distance,sampling depthand time of power supply.Pole material is carbon fiber rods.The best extraction voltage is 9V.The adsorbent material is low density polyurethane foam.The foam carrier is TRPO(trialkl phosphine oxide).The extract agent is citric acid and ammonium citrate.The best extraction distance is 50~75cm,the power supply time is6~18h.(3)By comparing the extraction effect of ammonium chloride,citric acid and ammonium citrate and other extraction agent test,the ammonium chloride is not suitable as geoelectro extraction agent because of low leaching U,citric acid and ammonium citrate can leach the adsorption U of clay under the condition that not damage the mineral lattice,which can be used as environmental and effective extraction agent for active state U and can effectively dissolved out the adsorbed uranium ions from the soil.to enhance the adsorption of geoelectric anomaly information extractor,the purpose of.Then the device can absorb the ions to achieve the purpose of enhancing the abnormal information.The application of the geoelectrochemical method was carried out in Bayanwala uranium of Erdos basin and Daying uranium of Ordos Basin.The effectiveness of this method on the known uranium deposit was analyzed comprehensively,which summarized the extract anomaly of the space distribution characteristics above the concealed sandstone type uranium deposit.It is concluded that the contents of U,Li,V and other elements in the top of the sandstone-type uranium ore body are mainly shown as jumping jagged high value anomalies,which established the sandstone type uranium deposit in electrochemical prospecting marks and patterns.The results show that the geologic extraction of U,Sr,Li anomalies in the Ordos Basin is related to the deep hidden sandstone with depth of more than 500 m.Uranium mineralization information has a good indication.(4)A portable multifunctional electrogeochemical field power supply device was independently developed,which has several adjustable voltage and constant current output display.The automatic power off of the device also eliminate the inevitable difference in power supply time of dry battery between the measuring point.It effectively guarantees the stability of the power supply voltage and the consistencyand the accuracy of the power supply time between each measuring point.(5)The application of the geoelectrochemical method was carried out in Bayanwala uranium of Erdos basin and Daying uranium of Ordos Basin.The effectiveness of this method on the known uranium deposit was analyzed comprehensively,which summarized the extract anomaly of the space distribution characteristics above the concealed sandstone type uranium deposit.It is concluded that the contents of U,Li,V and other elements in the top of the sandstone-type uranium ore body are mainly shown as jumping jagged high value anomalies,which established the sandstone type uranium deposit in electrochemical prospecting marks and patterns.The results show that the geologic extraction of U,Sr,Li and V anomalies in the Ordos Basin is related to the deep hidden sandstone with depth of more than 500 m.Uranium mineralization information has a good indication.