Method for preparing nanometer silica micropowder
A nano-silicon micropowder and coarse pulverization technology, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve the problems of high preparation cost and complex process, and achieve the effect of low production cost and controllable size.
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[0023] Example 1
[0024] Choose quartz sand (50 mesh) with a silica mass fraction of not less than 99.5% as the raw material, add industrial hydrochloric acid (qualified product, 31% HCl content, hydrochloric acid over the quartz sand) and soak for 10 hours, remove the acid solution and use clean water Rinse repeatedly until the chloride ion content is less than 0.1%. Wet grind to 800 mesh with a ball mill, the obtained slurry is naturally precipitated after the free iron is removed by a magnetic separator, and then the precipitate is separated mechanically, and the precipitate is sent back to the wet grinding process to participate in the grinding again. Add 3% (volume concentration) polyethylene glycol (PEG200) to the suspended solid slurry from which the sediment is removed, disperse by 0.5KW high-energy ultrasound for 5 minutes, and obtain a filter cake by suspension hydraulic filtration, and use high-energy ball milling to filter The cake is ground to about 3000 mesh. The...
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[0025] Example 2
[0026] Choose quartz sand (with a particle size of 75 mesh) with a silica mass fraction of not less than 99.5% as the raw material, add industrial hydrochloric acid (first grade, 33% HCl content, hydrochloric acid over the quartz sand) and soak for 8 hours, remove the acid and use Rinse with clean water repeatedly until the chloride ion content is less than 0.1%. Wet grinding to about 900 mesh with a ball mill, the obtained slurry is naturally precipitated after the free iron is removed by a magnetic separator, and then the precipitate is separated mechanically, and the precipitate is sent back to the wet grinding process to participate in the grinding again. Add 4% (volume content) of sodium dodecylbenzene sulfonate to the suspended solids slurry from which the sediment is removed, disperse by 1.0KW high-energy ultrasound for 3 minutes, and obtain a filter cake from the suspension hydraulic filter, and use the high-energy ball milling method to The filter cak...
Example Embodiment
[0027] Example 3
[0028] Choose quartz sand with a silica mass fraction of not less than 99.5% (particle size 100 mesh) as the raw material, add industrial hydrochloric acid (first grade, 33% HCl content, hydrochloric acid over the quartz sand) and soak for 5 hours, remove the acid and use Rinse with clean water repeatedly until the chloride ion content is less than 0.1%. Wet grinding with a ball mill to about 1000 meshes is used to obtain a slurry that is naturally precipitated after the free iron is removed by a magnetic separator, and then the precipitate is separated mechanically, and the precipitate is sent back to the wet grinding process to participate in the grinding again. Add 6% (volume content) Tween-80 to the suspended solids slurry to remove sediments, use 1.5KW high-energy ultrasonic dispersion for 2 minutes, and obtain the filter cake by the suspension hydraulic filter, and use the supersonic grinding method to perform the filter cake Grind to about 4000 mesh. T...
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