(1) Leaching. Acid leaching, especially with sulphuric acid, is widely used. In order to be easily Ming uranium hexavalent uranium leaching in need of high iron salt, the oxidizing agent and the like of MnO2. Leaching and secondary mineral uraninite, to low concentration of sulfuric acid containing H2SO4 3-7kg / m3 of. For uranium ore with high carbonic acid, it is necessary to consume large sulphuric acid. At this time, it can be leached with Na2CO3. In order to prevent the formation of Na2UO4 precipitate, it is necessary to have bicarbonate. The leaching residue and the solution are separated, and the countercurrent decantation method is generally carried out by a multistage concentrator, and the supernatant is further subjected to a beach to obtain a rich liquid. (2) Refinement of rich liquid and concentration of uranium. There are ion exchange methods and solvent extraction methods. Ion exchange method. Since uranium in sulfuric acid leaching exists as a complex anion such as UO2(SO4)34-, UO2(SO4)22-, an anion exchange resin having a quaternary amine group is widely used. According to the operation example of the supernatant, the leachate containing U3O80.5-1.0kg/m3 can be concentrated to about 10kg/m3. On the other hand, it is difficult to obtain the supernatant due to the poor filtration performance and sedimentation performance of the low-grade uranium ore leachate. Therefore, the resin resin method of directly transferring the resin into the uranium for adsorption recovery is adopted. The leaching of the uranium ore and the secondary minerals may be carried out using a low concentration of sulfuric acid containing H2SO4 3-7 kg/m3. For uranium ore with high carbonic acid, it is necessary to consume large sulphuric acid. At this time, it can be leached with Na2CO3. In order to prevent the formation of Na2UO4 precipitate, it is necessary to have bicarbonate. (3) Manufacture of uranium concentrate (yellow cake). In the uranium solution purified by the above-mentioned ion exchange, solvent extraction, etc., adding scent or caustic soda, the uranium is precipitated as heavy uranium acid (NH4)2U2O7, or sodium diuranate Na2U2O7. Uranium concentrate or yellow cake, containing about 80% U3O8, is sent to the refinery for processing. Sofa For Two,2 Seater Sofa Bed,Two Seater Sofa Bed,2 Seater Recliner Sofa Wuyi Superior Leisure Products CO.LTD , https://www.tcsuperior.com