Mineralogical Analysis of Bentonite from the ABM5 Heater Experiment at Äspö Hard Rock Laboratory, Sweden
| Autor: | Patrik Sellin, Kristian Ufer, Reiner Dohrmann, Daniel Svensson, Stephan Kaufhold |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
020101 civil engineering 02 engineering and technology technical barrier 010502 geochemistry & geophysics 01 natural sciences 0201 civil engineering Corrosion Siderite chemistry.chemical_compound Äspö Dissolution 0105 earth and related environmental sciences Calcite Precipitation (chemistry) bentonite Metallurgy Geology Mineralogy Geotechnical Engineering and Engineering Geology smectite alteration ABM-test chemistry Bentonite Carbonate Deposition (chemistry) QE351-399.2 |
| Zdroj: | Minerals Minerals, Vol 11, Iss 669, p 669 (2021) Volume 11 Issue 7 |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min11070669 |
| Popis: | The present study reports on the analysis of all blocks of the ABM5 test, which is a medium scale bentonite buffer deposition test. In contrast to similar tests, the ABM5 was conducted at higher temperature (up to 250 °C). The aim of the study was to characterize the chemical and mineralogical reactions and to identify the effect of the extraordinarily high temperature. Reactions observed were similar to those observed in previous and/or similar tests covering cation exchange, anion inflow, dissolution and precipitation of C- and S-phases, Fe corrosion, and Mg increase at the heater. Neither the type nor the extent of the different reactions could be related to the significantly higher temperature. However, due to the absence of lubricant used between heater and bentonite, it could be proved that the calcite previously present was dissolved and precipitated as siderite at the contact, pointing towards the importance of the presence of carbonate when considering different Fe corrosion products. Moreover, for the first time, a decrease of the Mg content at the heater was observed, which was probably because a Mg-rich clay was used. The reasons for Mg increase or decrease are still not completely understood. |
| Databáze: | OpenAIRE |
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