Hydrothermal alterationof a saponitic bentonite: mineral reactivity and evolution of surface properties

$14.96 plus tax (Refund Policy)

Buy Article:


Saponitic bentonite mined in the Magan deposit (Toledo, Spain), has been classified as a suitable clay barrier in the storage of high-level radioactive waste. Several hydrothermal alteration assays have been carried out in Teflon reactors at 45, 60, 90, 120, 175 and 200°C for periods of up to 1 y. The mineral components of bentonite are stable below 175°C. At and above this temperature, the accessory sepiolite transforms into a monomineral phase of saponitic composition. The texture of the clay also changes. A rise in temperature above 120°C causes a decrease in the proportion of the <2 m size-fraction, a reduction of BET and total surface areas and an increase in the relative volume of micropores (<20 Å). This process has been interpreted as the formation of granular aggregates that preserve a micropore network. This new arrangement of the aggregates produces a significant reduction in the free swelling volume.


Document Type: Research Article

DOI: http://dx.doi.org/10.1180/000985501547358

Publication date: March 1, 2001

More about this publication?
Related content



Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more