Preparation method of low-apparent-density cerium dioxide with particle size of 60mu m or larger
A technology of ceria and bulk density, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as high cost, poor fluidity, and high bulk density of ceria , to achieve the effect of reduced bulk density, good fluidity and uniform particle distribution
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[0016] A method for preparing cerium oxide with a small packing density of more than 60um, using cerium salt solution as raw material, controlling the particle shape by adding a surfactant, uniformly adding a precipitant solution to obtain cotton-like cerium carbonate, and then statically aging , washing with water, washing with alcohol, firing to obtain cerium dioxide powder with large particle size and large specific surface area; including the following steps:
[0017] 1) Using cerium salt solution as a raw material, diluting the cerium salt solution to 0.5-1.5mol / L, adding 1%-7% surfactant in terms of ceria weight percentage to the salt solution, stirring and dissolving to obtain a mixed solution;
[0018] 2) The precipitant is prepared as an aqueous solution, the pH of the precipitant solution is 5-14, and the anion concentration of the precipitant solution is 0.5-3mol / L;
[0019] 3) After heating up the mixed solution prepared in step 1 to 50-90°C, uniformly add the pre...
Embodiment 1
[0021] 1) with CeCl 3 solution as raw material, the CeCl 3 The solution was diluted to 1.5mol / L, and 1L of diluted CeCl was added to the beaker 3 solution (CeO 2 is 258g), in cerium chloride solution, add 3g polyacrylic acid (as CeO 2 % by weight is 1.2%), stirred until the additive and the solution are mixed uniformly to obtain a mixed solution;
[0022] 2) Sodium carbonate is prepared as a 100g / L aqueous solution, and ammonia is added to the sodium carbonate solution to adjust the pH value to 5 to obtain a precipitant solution;
[0023] 3) After raising the temperature of the mixed solution to 75°C, add the precipitant solution evenly into the mixed solution at a rate of 15ml / min. When the pH value of the mixed solution system reaches 6.5, stop adding the precipitant solution, and keep the system temperature and stirring intensity for 10 minutes , stand still, drain the supernatant, add water to wash 3 times, filter and dehydrate, and burn at 700 ° C for 8 hours to obtai...
Embodiment 2
[0025] 1) With Ce(NO 3 ) 3 solution as raw material, Ce(NO 3 ) 3 The solution was diluted to 1.0mol / L, and 1L of diluted Ce(NO 3 ) 3 solution, to Ce(NO 3 ) 3 Add 3g of polyethylene glycol into the solution, and stir until the additive and the solution are mixed evenly to obtain a mixed solution;
[0026] 2) Ammonium bicarbonate is prepared as a 200g / L aqueous solution, and ammonia is added to the ammonium bicarbonate solution to adjust the pH value to 9 to obtain a precipitant solution;
[0027] 3) After raising the temperature of the mixed solution to 85°C, add the precipitant solution evenly into the mixed solution at a rate of 10 L / min. When the pH value of the mixed solution system reaches 7, stop adding the precipitant solution, and keep the system temperature and stirring intensity for 40 minutes , stand still, drain the supernatant, add water to wash 3 times, filter and dehydrate, and burn at 800°C for 5 hours to obtain the sample, which can be sent for testing, ...
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