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in subjects: "Smectite"  
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Fine particle clay catalysts for coal liquefaction

Description: The efficient production of environmentally acceptable distillate fuels requires catalysts for hydrogenation and cleavage of the coal macromolecules and removal of oxygen, nitrogen, and sulfur heteroatoms. The goal of the proposed research is to develop new catalysts for the direct liquefaction of coal. This type of catalyst consists of fine clay particles that have been treated with reagents which form pillaring structures between the aluminosilicate layers of the clay. The pillars not only ho… more
Date: January 1, 1991
Creator: Olson, E.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of saponite and saponite/sepiolite fluids for geothermal drilling

Description: The rheology and other properties of drilling fluids containing saponite and a saponite-sepiolite mixture as the main vicosifier have been systematically evaluated in the temperature range of 300-600{degree}F under appropriate confining pressures up to 16,000 psi. Saponite represents the magnesium analog of the clay mineral montmorillonite, which is the main constituent in conventional bentonite-based fluids. The fluid with 6% saponite exhibits a prominent viscosity enhancement at temperatures … more
Date: February 1, 1991
Creator: Guven, N.; Panfil, D. J. & Carney, L. L. (Texas Tech Univ., Lubbock, TX (USA). Dept. of Geosciences)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Changes in U(VI) speciation upon sorption onto montmorillonite from aqueous and organic solutions

Description: The speciation of UO{sub 2}{sup 2+} and UO{sub 2}{sup 2+} Tributylphosphate (TBP) mixtures has been investigated in solution and intercalated with the reference smectite clay SAz-1 using x-ray absorption, Raman, and luminescence spectroscopies. Neither aquated UO{sub 2}{sup 2+} nor its TBP complex undergoes any detectable changes in uranium oxidation state on intercalation. Further, at the pH values employed in this work, there is no evidence for hydrolysis of the uranium species to generate di… more
Date: January 1, 1991
Creator: Chisholm-Brause, Catherine; Morris, David E.; Eller, P. Gary; Buscher, Tom & Conradson, Steven D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Fracture-lining minerals in the lower Topopah Spring Tuff at Yucca Mountain

Description: Fracture-lining minerals in the lower Topopah Spring Member of the Paintbrush Tuff at Yucca Mountain, Nevada, are being examined to characterize potential flow paths within and away from the candidate repository horizon. Fracture coatings within this interval can be divided into five categories based on rock matrix and type of fracture. Fracture coatings in the densely welded tuff above the basal vitrophyre, near the candidate repository horizon, include (1) those related to lithophysal cavitie… more
Date: January 1, 1991
Creator: Carlos, Barbara A.; Bish, David L. & Chipera, Steve J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Parametric effects on glass reaction in the unsaturated test method

Description: The Unsaturated Test Method has been applied to study glass reaction under conditions that may be present at the potential Yucca Mountain site, currently under evaluation for storage of reprocessed high-level nuclear waste. The results from five separate sets of parametric experiments are presented wherein test parameters ranging from water contact volume to sensitization of metal in contact with the glass were examined. The most significant effect was observed when the volume of water, as cont… more
Date: December 1, 1991
Creator: Woodland, A.B.; Bates, J.K. & Gerding, T.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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