Preparation method of quadrivalent uranium-cerium-oxygen solid solution

[0023] Dissolve uranium oxide with 6mol / L nitric acid, configure 65g / L uranyl nitrate solution, dissolve cerous nitrate and oxalic acid respectively with deionized water, prepare 0.5mol / L cerous nitrate solution and 0.5mol / L oxalic acid solution, and 65g / L uranyl nitrate solution is placed in the cathode chamber of the electrolytic cell, 2.5mol / L nitric acid is added into the anode chamber, the titanium mesh is used as the cathode, and the platinum-plated titanium sheet is used as the anode. -2 . Carry out electrolysis at normal temperature, after 15 hours, get uranium nitrate solution at the cathode, draw out the cathode chamber electrolyte; press UO 2 : CeO 2 The weight ratio is calculated as 90:10, add 0.5mol / L cerous nitrate solution, mix well, slowly add into 0.5mol / L oxalic acid solution, filter the obtained precipitate and wash with deionized water, dry naturally, place in In the tube furnace, the temperature was raised to 1223K, and kept for 4 hours, then cooled natu...

[0025] Dissolve uranium oxide with 6mol / L nitric acid, configure 180g / L uranyl nitrate solution, dissolve cerous nitrate and oxalic acid respectively with deionized water, and prepare 0.5mol / L cerous nitrate solution and 0.5mol / L oxalic acid solution; 180g / L uranyl nitrate solution is placed in the cathode chamber of the electrolytic cell, 2.5mol / L nitric acid is added to the anode chamber, the titanium mesh is used as the cathode, and the platinum-plated titanium sheet is used as the anode. -2 . Perform electrolysis at normal temperature, after 8 hours, get uranium nitrate solution at the cathode, press UO 2 : CeO 2 Calculated at a weight ratio of 95:5, add 0.5 mol / L cerous nitrate solution, mix well, slowly add to 0.5 mol / L oxalic acid solution, filter the resulting precipitate and wash with deionized water, dry naturally, and place In the tube furnace, the temperature was raised to 1473K, and kept for 2 hours, then cooled naturally, and finally the oxide was obtained. fi...

[0027] Dissolve uranium oxide with 6mol / L nitric acid, configure 150g / L uranyl nitrate solution, dissolve cerous nitrate and oxalic acid respectively with deionized water, and prepare 0.5mol / L cerous nitrate solution and 0.5mol / L oxalic acid solution; 150g / L uranyl nitrate solution is placed in the cathode chamber of the electrolytic cell, 3mol / L nitric acid is added into the anode chamber, the titanium mesh is used as the cathode, the platinum-plated titanium sheet is used as the anode, the area ratio of yin and yang is 2, and the current density is 20mA.cm -2 . Carry out electrolysis at normal temperature, after 30 hours, the cathode will get uranium nitrate solution, draw out the cathode chamber electrolyte, press UO 2 : CeO 2 Calculated at a weight ratio of 99:1, add 0.5 mol / L cerous nitrate solution, mix well, slowly add to 0.5 mol / L oxalic acid solution, filter the resulting precipitate and wash with deionized water, dry naturally, place in In the tube furnace, the tem...