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.

Inactive Publication Date: 2010-03-03
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the ubiquitous problems of complex process and high production cost in the current nano-silica powder preparation process, the present invention proposes a method for preparing nano-silica powder by wet grinding, dispersing and drying of quartz powder.

Method used

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  • Method for preparing nanometer silica micropowder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Choose quartz sand (grain size 50 mesh) with a silica mass fraction not less than 99.5% as raw material, add industrial hydrochloric acid (qualified product, HCl content 31%, hydrochloric acid submerged in quartz sand) and soak for 10 hours, remove the acid solution and rinse with clean water Rinse repeatedly until the chloride ion content is below 0.1%. Use a ball mill to wet-grind to 800 mesh. The obtained grinding slurry will pass through a magnetic separator to remove free iron and then precipitate naturally. Then the sediment will be separated by mechanical means, and the sediment will be sent back to the wet grinding link to participate in grinding again. Add 3% (volume concentration) polyethylene glycol (PEG200) to the suspended matter slurry that removes sediment, adopt 0.5KW high-energy ultrasonic to disperse 5min, and obtain filter cake to suspension hydraulic filtration, and adopt high-energy ball milling method to filter The cake was ground to about 3000 mes...

Embodiment 2

[0026] Select quartz sand (with a particle size of 75 mesh) with a silica mass fraction not lower than 99.5% as raw material, add industrial hydrochloric acid (first-grade product, HCl content 33%, hydrochloric acid submerged in quartz sand) for 8 hours, remove the acid solution and use Rinse with clean water repeatedly until the chloride ion content is lower than 0.1%. Use a ball mill to wet-grind to about 900 meshes. The obtained grinding slurry will pass through a magnetic separator to remove free iron and then precipitate naturally. Then, the precipitate will be separated by mechanical means, and the precipitate will be sent back to the wet grinding link to participate in grinding again. Add 4% (volume content) sodium dodecylbenzene sulfonate in the suspension slurry that removes sediment, adopt 1.0KW high-energy ultrasonic dispersion 3min, and obtain filter cake to suspension hydraulic filtration, and adopt high-energy ball milling method to The filter cake was ground to ...

Embodiment 3

[0028] Choose quartz sand (grain size 100 mesh) with silica mass fraction not less than 99.5% as raw material, add industrial hydrochloric acid (first-grade product, HCl content 33%, hydrochloric acid submerged in quartz sand) and soak for 5 hours, remove the acid solution and use Rinse with clean water repeatedly until the chloride ion content is lower than 0.1%. Use a ball mill to wet-grind to about 1000 meshes. The obtained grinding slurry will pass through a magnetic separator to remove free iron and then precipitate naturally. Then the sediment will be separated by mechanical means, and the sediment will be sent back to the wet grinding link to participate in grinding again. Add 6% (volume content) of Tween-80 to the suspension slurry that removes sediment, adopt 1.5KW high-energy ultrasonic dispersion for 2min, and obtain filter cake to suspension hydraulic filtration, and adopt supersonic speed grinding method to filter cake Grind to about 4000 mesh. Accelerate the sed...

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Abstract

The invention discloses a method for preparing nanometer silica micropowder, and relates to the technical field of nano-powder preparation. The method comprises the following steps in particular: carrying out magnetic separation and acid pickling on quartz sand raw material after coarse grinding to remove impurity, wherein, the mass fraction of the silicon dioxide in the quartz sand is not less than 99.5%; carrying out wet process grinding to obtain grinding slurry; and naturally sedimenting after deironing by magnetic separation; separating sediment by the mechanical settlement method; and then sending the sediment back to the step of wet process grinding for grinding anew; meanwhile, adding dispersing agent into suspended matter slurry with the sediment thereof being removed; adopting high energy ultrasound dispersion; filter pressing the suspending liquid to obtain filter cakes; grinding the filter cakes by adopting extra-fine grinding method; speeding up sediment by centrifugal separation to separate extra-fine grinding sediment; sending the extra-fine grinding sediment to the step of extra-fine grinding for grinding anew; removing extra-fine grinding size of the sediment; obtaining filter cakes by filter pressing; drying to obtain the nanometer silica micropowder; and realizing size grading of the nanometer silica micropowder by adjusting centrifugal separation speed. Themethod of the invention has simple process and convenient operation, is suitable for industrial scale continuous production; the size of the nanometer silica micropowder can be controlled, and products with different specifications can be conveniently produced.

Description

technical field [0001] The invention relates to a method for preparing nanometer powder, in particular to a method for preparing nanometer silica powder through processes such as wet grinding, separation, dispersion and drying. Background technique [0002] Nano-silica powder (or nano-silicon dioxide) has many unique properties, such as quantum size, quantum tunneling effect, special optical and electrical characteristics, high magnetoresistance, nonlinear resistance, and high strength, high toughness, and high temperature at high temperatures. stability etc. These properties make it have anti-ultraviolet optical properties, which can improve the strength, elasticity, aging resistance and chemical resistance of the material, and can absorb pigment ions and reduce pigment attenuation. Therefore, nano-silica powder can be widely used in catalyst carriers, polymer composite materials, electronic packaging materials, precision ceramic materials, rubber, paper, plastics, adhesiv...

Claims

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Application Information

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IPC IPC(8): B82B3/00
Inventor 陈刚赵玉涛王国路
Owner JIANGSU UNIV
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