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(1) Refinement of yellow cake. Yellow cake from smelting usually dissolved in nitric acid (vinegar tributyl phosphate) with TBP solvent extraction to remove impurities. The resulting purified UO2 (NO3) processing method 2 solution, there UNH cooking precipitate separated UO2 (NO3) 2 · 6H2O crystals (uranium nitrate hexahydrate) method, and the atmosphere precipitate ADU diuranate acid iron (NH4) 2U2O7 · 2H2O in (Ammo Nium diuranate) method.
These compounds are decomposed into UO3 by heating at a temperature of 600 K or more after a dry bath. When UO3 is used as a raw material of UO2, the powder obtained by the ADU method has good sintering properties. UO3 is reduced to UO2 by gas decomposed with ammonia at 870-1020K, and then UF. Made of metal uranium or making by UF6. UO3 above hydrogen reduction and step without HF with a fluorinated gas fire with 233U concentrated, and wet with the following substitution method. That is, when the uranium concentrate leaching solution is extracted with a solvent, it is converted into a UO2Cl2 graded solution with hydrochloric acid, and then reduced by electrolysis with an ion exchange membrane, and then reduced to UC14 and then added with HF to precipitate as UF4·3/4H, O, Finally, about 620K dehydration is converted to UF4 (green salt).
(2) The method of making metal uranium. UF4 is used as a raw material for the manufacture of metal uranium. The reason is that other halides are easily softened or hydrolyzed in the air because they are hygroscopic. The system has UF4. Various methods such as reduction to molten salt electrolysis by metal, and reduction of OF4 by magnesium have been industrialized. In a stainless steel high-pressure bottle lined with MgF2, put in the mixed 10-20 mesh metal magnesium particles and UF4 powder, cover the top with a graphite plate, screw the cover with a nut, and heat it to 770- in the heating furnace. 780K, according to the following reaction at the bottom of the bottle to the uranium block: OF4 + 2Mg U + 2MgF2 (6-5) vacuum melting. After casting the ingot to the processing. The analytical values ​​of the impurities in the metal uranium obtained by the above method are as follows: Bo.1, Mn10. N25, Ni35, Cr10, Fe60, Si30, C20ppm.
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