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Preparation and Refinement of Microamorphous Silica
Hršak, D., Malina, J. and Sučik, G. Preparation and Refinement of Microamorphous Silica Chemical Papers, Vol.58, No. 3, 2004, 191-194
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Document type:
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Článok z časopisu / Journal Article |
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Collection:
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Chemical papers
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| Attached Files |
| Name |
Description |
MIMEType |
Size |
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n583a191.pdf
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583a191.pdf |
application/pdf |
282.09KB |
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| Author(s) |
Hršak, D.
Malina, J.
Sučik, G.
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| Title |
Preparation and Refinement of Microamorphous Silica
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| Journal name |
Chemical Papers
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| Publication date |
2004
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| Year available |
2004
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| Volume number |
58
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| Issue number |
3
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| ISSN |
0366-6352
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| Start page |
191
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| End page |
194
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| Place of publication |
Poland
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| Publisher |
Versita
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| Collection year |
2004
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| Language |
english
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| Subject |
250000 Chemical Sciences
250500 Macromolecular Chemistry
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| Abstract/Summary |
The application of sulfuric acid for the leaching of serpentinite ore has been investigated in order to prepare the high-purity powder of amorphous SiO2 with great surface area. Serpentinite with high content of antigorite was milled to particles under 200 µm in size and then thermally treated with the aim to destroy the crystal structure of antigorite. The highest leaching extent was achieved by H2SO4 solution with concentration 5 mol dm-3, while optimum leaching time was 4 h. Characterization and refinement of the prepared powder were also performed. By the leaching process a good-quality powder of microamorphous silica with 97.36 mass % SiO2 was prepared, having the surface area 162 m2 g-l and 71.10 % of particles under 9 µm in size. After a relatively simple refinement procedure, the content of SiO2 was increased to 98.72 % and BET surface area to 180 m2 g-l.
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