A method for improving the dispersibility of prepared oxide powder by vacuum freeze-drying
A vacuum freeze-drying, oxide powder technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, zirconia, etc., to achieve the effects of good dispersibility, large particle size uniformity, and improved dispersibility
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Embodiment 1
[0027] The invention discloses a method for improving the dispersibility of prepared oxide powder by vacuum freeze-drying. Follow the steps in order:
[0028] 1) The precipitation precursor prepared by the chemical precipitation method was added with n(SO 4 2- ):n(Al 3+ )=0% molar ratio of ammonium sulfate as a dispersant deionized water for suction filtration. Prepare the filtered precursor filter cake with deionized water into a "paste" with a concentration of 0.05mol / L, then put the paste in a petri dish with a thickness of 3 mm, and place it in a vacuum freeze dryer Cool down to -60°C at a rate of 1°C / min. Precursor powder with good dispersibility can be obtained after sublimation and drying after 10 hours of heat preservation
[0029] 2) Calcining the freeze-dried precursor at a high temperature in a muffle furnace to obtain Al with a uniform particle size distribution, an average particle size of 300nm, and a slightly poorly dispersed agglomeration coefficient of 12...
Embodiment 2
[0031] The invention discloses a method for improving the dispersibility of prepared oxide powder by vacuum freeze-drying. Follow the steps in order:
[0032] 1) The precipitation precursor prepared by the chemical precipitation method was added with n(SO 4 2- ):n(Al 3+ )=5% molar ratio of ammonium sulfate is used as the deionized water of dispersant to carry out suction filtration. Prepare the filtered precursor filter cake with deionized water into a "paste" with a concentration of 0.05mol / L, then put the paste in a petri dish with a thickness of 3 mm, and place it in a vacuum freeze dryer Cool down to -60°C at a rate of 1°C / min. Precursor powder with good dispersibility can be obtained after sublimation and drying after 10 hours of heat preservation
[0033] 2) Calcining the freeze-dried precursor at a high temperature in a muffle furnace to obtain a well-dispersed Al with a uniform particle size distribution, an average particle size of 120 nm, and an agglomeration co...
Embodiment 3
[0035] The invention discloses a method for improving the dispersibility of prepared oxide powder by vacuum freeze-drying. Follow the steps in order:
[0036] 1) The precipitation precursor prepared by the chemical precipitation method was added with n(SO 4 2- ):n(Y 3+ )=7% mol ratio of ammonium sulfate is used as the deionized water of dispersant to carry out suction filtration. The precursor filter cake filtered by suction was configured into a "paste" with a concentration of 0.2mol / L with deionized water, and then the paste was placed in a petri dish with a thickness of 5 mm, and placed in a vacuum freeze dryer Cool down to -55°C at a cooling rate of 2°C / min. After 12 hours of heat preservation, the precursor powder with better dispersibility can be obtained by sublimation and drying.
[0037] 2) Calcining the freeze-dried precursor at a high temperature in a muffle furnace to obtain an inorganic functional nanopowder with uniform particle size distribution, an average...
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Abstract
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