Specific features of the phase transition of gibbsite into boehmite under hydrothermal treatment of floccules in an aqueous suspension

Specific features of the phase transition of gibbsite into boehmite under hydrothermal treatment... Effect of the conditions in which floccules of gibbsite are hydrothermally treated on the phase composition of products of its dehydration products, obtained at T = 180–210°C and P = 1.0–1.9 MPa was studied. The phase transition of gibbsite into boehmite occurs by the dissolution–deposition mechanism upon delamination of gibbsite crystals along the (001) plane to give a multitude of layers with thicknesses of 20–100 nm and cracks in between, with widths of 10–50 nm. In the dissolution of gibbsite, [Al(OH)4]– anions pass into solution and react with protons of hydroxy groups on the (001) planes of gibbsite, with the subsequent nucleation of boehmite and growth of its crystals. The crystallization of coarse boehmite particles favors formation of nonporous floccules. Boehmite particles form no strong crystallization bonds with each other, which impairs their abrasion resistance. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Applied Chemistry Springer Journals

Specific features of the phase transition of gibbsite into boehmite under hydrothermal treatment of floccules in an aqueous suspension

Loading next page...
 
/lp/springer_journal/specific-features-of-the-phase-transition-of-gibbsite-into-boehmite-j60mDTkM4b
Publisher
Springer Journals
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Chemistry; Chemistry/Food Science, general; Industrial Chemistry/Chemical Engineering
ISSN
1070-4272
eISSN
1608-3296
D.O.I.
10.1134/S1070427215050079
Publisher site
See Article on Publisher Site

Abstract

Effect of the conditions in which floccules of gibbsite are hydrothermally treated on the phase composition of products of its dehydration products, obtained at T = 180–210°C and P = 1.0–1.9 MPa was studied. The phase transition of gibbsite into boehmite occurs by the dissolution–deposition mechanism upon delamination of gibbsite crystals along the (001) plane to give a multitude of layers with thicknesses of 20–100 nm and cracks in between, with widths of 10–50 nm. In the dissolution of gibbsite, [Al(OH)4]– anions pass into solution and react with protons of hydroxy groups on the (001) planes of gibbsite, with the subsequent nucleation of boehmite and growth of its crystals. The crystallization of coarse boehmite particles favors formation of nonporous floccules. Boehmite particles form no strong crystallization bonds with each other, which impairs their abrasion resistance.

Journal

Russian Journal of Applied ChemistrySpringer Journals

Published: Aug 15, 2015

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off