Preparation method of high-purity low-uranium submicron spherical silicon dioxide micropowder
A spherical silica, sub-micron technology, applied in the direction of silica, silicon oxide, etc., can solve the problems of high raw material requirements, difficulty in making products, unstable U content of products, etc., and achieve the effect of low raw material requirements
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Embodiment 1
[0027] (1) Under the protection of argon, 10 kg and 80 mm of elemental silicon (purity 99.6%, uranium content 15 ppb) were calcined in a high-temperature furnace at 1250 ° C for 15 h. After the calcination, it is quenched with water, broken into sand materials below 1mm, and dried by sedimentation. The calcining-crushing-sedimentation drying step is recycled once. Collect the dried sand material several times for later use.
[0028] (2) Weigh 250kg of dried sand and add it to 230kg of water, and add 0.05kg of 1.5% hydrofluoric acid solution, and wet ball mill to obtain a powder slurry with an average particle size of 35 μm.
[0029] (3) Transfer the slurry to the reactor, add 15kg, 1.5% HF solution and 15kg, 0.5% HCl solution, add 0.1% hydrogen peroxide accounting for the mass of the mixed acid solution, and add flotation agent and collector to recover Uranium element was stirred at 60°C for 24 hours to obtain a slurry.
[0030] (4) Press-filter, wash and dry the powder slu...
Embodiment 2
[0033] (1) Under the protection of argon, 10kg and 35mm of silicon nitride (purity 99.8%) and elemental silicon (purity 99.6%) were calcined in a high-temperature furnace at 900°C for 5 hours. After the calcination, it is quenched with water, broken into sand materials below 1mm, and dried by sedimentation. The calcining-crushing-sedimentation drying step is recycled once. Collect the dried sand material several times for later use.
[0034] (2) Add 250kg of dried sand material to 230kg of water, and add 0.05kg of 1.5% hydrofluoric acid solution, and wet ball mill to obtain a powder slurry with an average particle size of 30 μm.
[0035] (3) Transfer the slurry to the reactor, add 15kg, 1.5% HF solution and 15kg, 0.5% HCl solution, add 0.3% hydrogen peroxide accounting for the mass of the mixed acid solution, and add flotation agent and collector to recover Uranium element was stirred at 60°C for 24 hours to obtain a slurry.
[0036] (4) Press-filter, wash and dry the powde...
Embodiment 3
[0039] (1) Under the protection of argon, 10kg and 70mm of silicon nitride (purity 99.6%) were calcined in a high-temperature furnace at 850°C for 15h. After the calcination, it is quenched with water, broken into sand materials below 1mm, and dried by sedimentation. The calcining-crushing-sedimentation drying step is recycled once. Collect the dried sand material several times for later use.
[0040] (2) Add 250kg of dried sand material into 230kg of water, and add 0.05kg of 1.5% hydrofluoric acid solution, and wet ball mill to obtain a powder slurry with an average particle size of 35 μm.
[0041] (3) Transfer the slurry to the reactor, add 15kg, 1.5% HF solution and 15kg, 1.5% HCl solution, add 0.1% hydrogen peroxide accounting for the mass of the mixed acid solution, and add flotation agent and collector to recover Uranium element was stirred at 35°C for 12 hours to obtain a slurry.
[0042] (4) Press-filter, wash and dry the powder slurry to obtain a powder with a uran...
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