| abstract |
The invention discloses a preparation method of rare earth oxide powder with a large specific surface. The rare earth chloride solution is precipitated by using an alkaline solution, the precipitation conditions are controlled to obtain a rare earth hydroxide slurry, and carbon dioxide gas is introduced into the slurry to carry out carbonization reaction. , control the flow rate of carbon dioxide to be 0.05-3.0L/min, the carbonization reaction temperature to be 5-60 ℃, when the system pH in the carbonization process is stable at 4.8-5.2 for 5min-120min, stop the carbonization reaction, filter and wash, and obtain the rare earth with core-shell structure Precipitating product; then calcining the precipitated product at 450-650° C. for 0.5-12 hours, finally obtaining rare earth oxides with particle size D 50 greater than 5.0 μm and specific surface area greater than 60 m 2 /g. The invention effectively utilizes the properties of the solubility product of rare earth hydroxide and rare earth carbonate and the method of carbon dioxide homogeneous carbonization, and at the same time controls the morphology and structure of the rare earth precipitation product through conditions, and finally obtains the oxidation of rare earth with a large specific surface at low cost and high efficiency. material powder. |