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Rheological properties of palygorskite–bentonite and sepiolite–bentonite mixed clay suspensions

Christidis Georgios, Yadeta C. Chemeda, Eleni Koutsopoulou, Tauhid Belal Khan, N.M. Tauhid Khana, Vicky Hatzistamou

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URI: http://purl.tuc.gr/dl/dias/7DC4B4E7-5167-4E3C-B6FE-1985C2D86FDB
Year 2014
Type of Item Peer-Reviewed Journal Publication
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Bibliographic Citation Y. C. Chemeda , G.E. Christidis , N.M. T. Khana, E. Koutsopoulou , V. Hatzistamou , V.C. Kelessidis ,"Rheological properties of palygorskite– bentonite and sepiolite–bentonite mixed clay suspensions ",Ap. C. Sc. ,vol. 90 ,pp.165–174 ,2014.doi :10.1016/j.clay.2013.12.013 https://doi.org/10.1016/j.clay.2013.12.013
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Summary

This study examines the influence of layer charge and smectite content on the rheological properties of mixedbentonite–palygorskite suspensions. Eight bentonite samples containing smectite with layer charge rangingbetween 0.38 and 0.54 e/huc were used to prepare 5% w/v mixed palygorskite–bentonite aqueous suspensionat pH 7. The influence of smectite on the apparent viscosity and yield point of palygorskite suspensions dependson the proportion of the smectite in themixture and the layer charge and charge localization of the smectite. Theinteraction between the two endmember clayminerals ismaximumat low percentage (10 to 20%) of bentonitein the mixture. Low charge and high charge smectite tended to improve and deteriorate, respectively, the yieldpoint and apparent viscosity of the suspension. This behaviour seemed to be related to the influence of layercharge of smectite on the degree of delamination and the thickness of smectite quasicrystals,which consequentlydetermine the number of particles involved in the interaction and the strength of particle–particle linkages.

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