Method for preparing low apparent density rare earth oxide
A technology of rare earth oxides and rare earth chlorides, applied in the fields of rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high cost, pollution of rare earth oxide purity, etc., and achieve low cost, easy control of product quality, The effect of mitigating purity
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Embodiment 1
[0029] Get 40 ml of 0.2 mol / L yttrium chloride solution and pour it into a 200ml reaction vessel, then place it in a microwave radiation device and turn on magnetic stirring; after the reaction vessel reaches a set temperature of 70°C, another 1.5 mol / L ammonium bicarbonate solution 30 ml, stirring dropwise into the yttrium chloride solution for precipitation, the reaction time is 90 min. After filtration, the filter cake was washed with pure water and absolute ethanol, and the precipitate was dried at 80 °C. Then thermally decompose it in a muffle furnace at 800 °C for 2 h, and cool to room temperature to obtain yttrium oxide powder with a bulk density of 0.18 g / cm3 and a specific surface area of 30.69 m 2 / g. The morphology of the prepared low bulk density yttrium oxide is analyzed by a high-power scanning electron microscope. The photos shown are as follows: figure 2 As shown, the obtained yttrium oxide is needle-shaped submicron particles with an average particle dia...
Embodiment 2
[0031] Get 30 ml of cerium chloride solution of 0.5 mol / L and pour it into a 200 ml reaction container, then place it in a microwave irradiation device, and turn on the magnetic stirring; 60 ml of 0.3 mol / L ammonium bicarbonate was poured into the reaction vessel, stirred and dropped into the cerium chloride solution for precipitation, and the reaction time was 60 min. After filtration, the filter cake was washed with pure water and absolute ethanol, and the precipitate was dried at 80 °C. Then thermally decompose it in a muffle furnace at 600 °C for 3 hours, and cool to room temperature to obtain cerium oxide powder with a bulk density of 0.31 g / cm3 and a specific surface area of 26.73 m 2 / g. The morphology of the prepared low bulk density cerium oxide is analyzed by high-power scanning electron microscope. The photos shown are as follows: image 3 As shown, the obtained cerium oxide is needle-shaped submicron particles with an average particle diameter of about 0.3 μm, ...
Embodiment 3
[0033] Get 20 ml of lanthanum chloride solution of 0.9 mol / L and pour it into a 200 ml reaction vessel, then place it in a microwave irradiation device, and carry out magnetic stirring; after the reaction vessel reaches a set temperature of 85° C, another 40 ml of 1.0 mol / L ammonium bicarbonate solution was stirred and dropped into the lanthanum chloride solution for precipitation, so as to obtain the precursor precipitate, and the reaction time was 180 min. Then the precursor is suction filtered, washed with distilled water and absolute ethanol in turn, and the obtained filter cake is dried in an oven. The dried precursor precipitation product was placed in a muffle furnace, calcined at 900 °C for 1 h, and cooled to room temperature to obtain ultrafine lanthanum oxide with an average particle size of about 0.4 μm ( Figure 4 ), its bulk density is 0.21 g / cm3, and its specific surface area is 16.50 m 2 / g.
[0034] In summary, the method adopted in the present invention is: ...
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Abstract
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