Method of preparing nanometer SiO2 from ophiolite

A serpentine and nanotechnology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of complex process, high production cost, unfavorable large-scale production of nano-SiO2, etc., and achieve the effect of simple process and low production cost

Inactive Publication Date: 2008-04-23
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] For the existing preparation of nano-SiO 2 There are some deficiencies in the technology, resulting in nano-SiO 2 High production cost and complex process are not conducive to nano-SiO 2 mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take by weighing the solid residue of a certain amount of 100g, add excessive hydrofluoric acid (excessive 10%), temperature of reaction is controlled at room temperature, the SiF gas that produces is passed in the ethanol aqueous solution (the mol ratio of ethanol and deionized water is 3: 1 ) aged for 4 hours, filtered, washed until the pH of the filtrate was 6, placed the filter cake in an oven, and baked at 150°C for 24 hours to obtain a nano-SiO2 product.

Embodiment 2

[0038] Weigh 100 g of the solid residue, put it into 16% sodium hydroxide solution to reflux, the solid-liquid ratio is controlled at 1:3, the reflux temperature is 80° C., and the reaction time is 1 h. The product after the reaction is sodium silicate, and then hydrochloric acid and surfactant are added to the sodium silicate solution, so that silicic acid can be precipitated, and then dried under ultrasonic conditions to obtain nano-SiO2 products.

Embodiment 3

[0040] Weigh 150g of serpentine ore powder with a fineness of 80 meshes as raw material, reflux with 31% industrial hydrochloric acid for 1 hour to leach the ore powder, the liquid-solid ratio is 4:1, and the reflux temperature is controlled at 95°C. The obtained leaching solution is filtered to carry out solid-liquid separation, and the obtained solid is the solid residue for preparing nano-SiO2.

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PUM

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Abstract

The present invention is superior process of preparing nanometer SiO2 with serpentine. Serpentine powder is first refluxed and leached to leach out soluble metal ions and solid matter with porous SiO2 as main component; and the solid matter is further prepared into nanometer SiO2 through a silicon tetrafluoride and sodium silicate process. The present invention has low cost and simple technological process.

Description

technical field [0001] The present invention relates to a kind of preparation method of nano material, particularly relate to a kind of nano SiO 2 Preparation. Background technique [0002] A nanometer is a unit of measurement of length (one billionth of a meter). The particle aggregates with particle diameters of 1-100nm are called nanoparticles. They not only have a large specific surface area, but also the number of surface atoms, surface energy and surface tension increase sharply with the decrease of particle size. Its particle shape can only be observed under a microscope. [0003] nano-SiO 2 It is an amorphous white powder (referring to its agglomerates), which is a non-toxic, odorless and non-polluting inorganic non-metallic material. Its molecular state is a three-dimensional chain structure (or three-dimensional network structure, three-dimensional silica structure, etc.), and there are unsaturated residual bonds and warp groups with different bonding states on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/113C01B33/18
Inventor 朱萍周鸣吴金华曾颖周劲
Owner SHANGHAI UNIV
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