Showing papers in "Applied Clay Science in 1991"

TL;DR: A discussion of the applications of clay materials is organized as follows: kaolins; smectites; palygorskite (attapulgite) and sepiolite; and miscellaneous as discussed by the authors.

TL;DR: The main commercially important kaolin resources at the present time are the primary deposits of Cornwall in England and the sedimentary deposits in Georgia and South Carolina in the USA as discussed by the authors, which can be classified into two types, primary (residual) and secondary (sedimentary).

TL;DR: Particle geometry, defined as particle size, particle size distribution, particle shape and aggregate structure, has a dominant influence over the rheological character of kaolin slurries, as well as on the properties imparted by the kaolin to filled and coated paper as discussed by the authors.

TL;DR: In this paper, the thermal properties of the pastes, including water content, composition and the nature of their clay mineral phase, are investigated for pelotherapic practices, and the authors advise the use of montmorillonites, which have a higher swelling capacity, for pelotherapy.

TL;DR: In soil science, the term clay refers to all particles less than 2 μm in diameter as mentioned in this paper and includes layer silicates, oxides and other minerals in the coarser fractions.

TL;DR: The adsorption behavior of organophilic bentonites in contact with aqueous solutions of organic compounds was studied in this paper, showing that the best adsorbed compounds were Phenol, aniline, and nitroethane, followed by hexadecyl pyridinium bromide, diethyl ketone, and finally by both organic acids.

TL;DR: In this paper, a column charged with the cation exchange resin supported by Ag+ to convert into Ag+-exchanged montmorillonite sol was passed through a column and fine particles were prepared from the resulting Ag+exchanged MT sol of which the Ag content was about 10 wt%.

TL;DR: Clay is the first manufacturing and construction raw material and the first lasting chronicler of man's own origin and early history as mentioned in this paper and it still occupies leading positions in the construction and manufacturing areas with each generic end-use accounting annually for about one billion dollars of salable product in the U.S. alone.

TL;DR: In this paper, the changes of pore structure and adsorption properties of a bentonite from Serbia after treatment with different concentration of HCl solutions (0.5-4 M) were investigated.

TL;DR: In this paper, the metal adsorption properties of vermiculite were investigated and the batch sorption kinetics can be described by a first-order reversible reaction and equilibria follow the Freundlich adsorptive isotherm.

TL;DR: In this paper, the potentialities of five Portuguese kaolins as filler and coating in the paper industry have been investigated and preliminary tests have been carried out and, among them, delamination through the application of intercalation and mechanical methods in order to improve the kaolin properties convenient for paper coating.

TL;DR: In this article, the authors used data from literature and some representative ternary diagrams from Fiori et al. (1989) to point out a more suitable use of Pleistocene clays, occurring in Lucanian and Apulian areas (Southern Italy), in the Italian tile production.

TL;DR: In this article, the thermal reactions of clay minerals on temperatures ranging from 500°C to 1100°C are important for formation of potteries as well as for reconstruction of their production conditions.

TL;DR: In this paper, the present large volume use of kaolin clay in catalytic petroleum processing, one of its most important present uses in industrial catalysis, is described, as a key ingredient in three families of microspherical cracking catalysts employed in the petroleum industry.

TL;DR: The effect of Na 2 CO 3 on several Argentine bentonites was studied in this article by means of XRD, DTA and physicochemical properties of the bentonite.

TL;DR: In this paper, the migration behavior of the nuclides cesium (Cs-137), strontium (Sr-90), cobalt (Co-60) and zinc (Zn-65) in the Badener Tegel, a Miocene clay of the Vienna Basin (Lower Austria), was investigated with the help of columns with undisturbed and orientated clay samples under advective conditions.

TL;DR: In this article, the variation of the particle-size of flocs in clay suspension with the salt concentration and the correlation of particle size with the sediment behavior of the suspensions have been studied.

TL;DR: In this paper, the authors determined if there are any obvious differences in the behavior pattern of the bentonites, specifically as it relates to thermal stability, which could be attributed to the differences in physico-chemical make up of the bendonites.

TL;DR: In this article, the authors demonstrate that trends in illite/smectite composition, established for the quantification of weathering, provide misleading results when applied to geologic sections, thermally affected by minor igneous intrusives.

TL;DR: In this article, the non-biological degradation of oxamide, adsorbed on Cu−2+, Al−3+ and Ca−2+ homoionic montmorillonite was investigated by HPLC, IR spectrometry and chemical analyses.

TL;DR: In a CO 2 atmosphere, one particular sample of kaolinite from Cornwall, England, when mixed with calcite in the proportions 4:1 or greater gave a very small, sharp endotherm at 840-845°C on curves obtained on three differential thermal analysis instruments of different design.

TL;DR: The genesis of these clays is complex as mentioned in this paper, and the associated clays, when present, have not been affected by noticeable modifications, being mostly illitic in composition, being formed by Verrucano debris sedimentation in lacustrine basins.

TL;DR: In this article, the change in horizontal stresses due to secondary compression is examined assuming "Hypothesis A" for the initiation of secondary compression, using test results from high-quality anisotropic consolidation tests extrapolated to relevant pressure ranges.