搜索结果: 31-45 共查到“矿床学与矿相学 sepiolite”相关记录61条 . 查询时间(0.191 秒)
Structural and Textural Modifications of Palygorskite and Sepiolite under Acid Treatment
Acid Attack Activation of Clays Fibrous Silica Palygorskite Sepiolite
2011/12/8
Abstract: Sepiolite from Mara (Zaragoza, Spain) and palygorskite from Attapulgus (Georgia, USA) were activated by treatment at different concentrations with solutions of boiling HCl under reflux condi...
Textural Transition and Genetic Relationship between Precursor Stevensite and Sepiolite in Lacustrine Sediments (Jbel Rhassoul, Morocco)
Jbel Rhassoul Sepiolite Stevensite Textural Transition Thermodynamic Calculation
2011/12/22
Abstract: In the Tertiary lacustrine sediments of the Jbel Rhassoul (Morocco), stevensite and sepiolite, confined to the dolomitic facies, are commonly mixed at lower parts of the so-called “Formation...
PROPERTIES AND APPLICATIONS OF PALYGORSKITE-SEPIOLITE CLAYS
palygorskite-sepiolite group clay minerals
2011/11/4
The palygorskite-sepiolite group of clay minerals has a wide range of industrial applications derived mainly from its sorptive, rheological and catalytic properties which are based on the fabric, surf...
Sepiolite-Palygorskite from the Hekimhan Region (Turkey)
Geochemistry Hekimhan Mineralogy Palygorskite Rare Earth Elements SEM Sepiolite Smectite XRD
2011/12/28
Upper Cretaceous-Tertiary marine clayey-calcareous rocks of the Hekimhan basin contain fibrous clay minerals in significant amounts. Ophiolitic rocks in the provenance area have contributed the elemen...
Model Calculation of Sepiolite Surface Areas
Heat treatment Model calculation Sepiolite Surface area
2011/12/28
In general, the N2-BET surface areas of sepiolite samples range from 95 to 400 m2/g depending on deposits.The surface areas of five sepiolites, all varying in crystallite size, were measured on heatin...
SEPIOLITE-PALYGORSKITE FROM THE HEKIMHAN REGION (TURKEY)
Geochemistry Hekimhan Mineralogy Palygorskite Rare Earth Elements SEM Sepiolite Smectite XRD
2011/11/2
Upper Cretaceous-Tertiary marine clayey-calcareous rocks of the Hekimhan basin containfibrous clay minerals in significant amounts. Ophiolitic rocks in the provenance area have contributed the element...
AN EXAMPLE TO SEPIOLITE FORMATION IN VOLCANIC BELTS BY HYDROTHERMAL ALTERATION: KIBRISCIK (BOLU) SEPIOLITE OCCURRENCE
Geological mineralogical sepiolite occurrence
2011/11/8
Geological, mineralogical and chemical properties of a sepiolite occurrence, located in the south of K齜r齭c齥 township of Bolu Province, northcentral Turkey, have been investigated in detail, and new mi...
Structural Fluorine in Sepiolite
Fluorine Hydroxyl Laser microprobe mass spectrometry Dissolution Nuclear magnetic resonance Sepiolite
2011/11/30
Abstract: Sepiolite from Vallecas-Vicálvaro, Spain, contains 1.3% fluorine. Laser microprobe mass spectrometry of this sepiolite suggests the presence of fragments of (SiO2)nOMgF and (SiO2)nOMgOH, whi...
Mechanisms of Palygorskite and Sepiolite Alteration as Deduced from Solid-State 27Al and 29Si Nuclear Magnetic Resonance Spectroscopy
Al coordination Hydrothermal transformation Nuclear magnetic resonance Palygorskite Sepiolite Smectite X-ray powder diffraction
2012/1/6
The mechanisms of palygorskite and sepiolite alteration to smectite under mild hydrothermal conditions were investigated by solid-state 27Al and 29Si magic-angle spinning-nuclear magnetic resonance (M...
Expandable Sepiolite from Ninetyeast Ridge, Indian Ocean
Chemical composition Ethylene glycol Expansion Sepiolite X-ray powder diffraction
2012/1/5
The structure of sepiolite from a piston core obtained on Ninetyeast Ridge in the Indian Ocean was modified by exposure to ethylene glycol vapor. With ethylene glycol, the sepiolite 011 X-ray powder d...
Modification of the Porous Structure and Surface Area of Sepiolite Under Vacuum Thermal Treatment
Adsorption microcalorimetry Microporosity Reciprocal thermal analysis Sepiolite Surface area Thermal treatment
2012/1/9
Modifications of the external surface area and the two types of microporosity of sepiolite (structural microporosity and inter-fiber porosity) were examined as a function of the temperature of a vacuu...
Methylation of Sepiolite and Palygorskite with Diazomethane
Diazomethane Methylation Palygorskite Porosity Sepiolite Silanol
2012/1/13
The methylation of the fibrous clays, sepiolite and palygorskite, should be facilitated by their large content of surface silanol groups and the low acidity and inaccessibility of coordinated water mo...
Palygorskite and Sepiolite Alteration to Smectite Under Alkaline Conditions
Alteration Analcime Cation-exchange capacity Palygorskite Sepiolite Smectite Sodium hydroxide
2011/11/25
Abstract: The instability of palygorskite and sepiolite under soil conditions was investigated to determine if these fibrous minerals transform directly to smectite under laboratory conditions. The tr...
DETECTION OF NONEQUIVALENT Si SITES IN SEPIOLITE AND PALYGORSKITE BY SOLID-STATE 29Si MAGIC ANGLE SPINNING-NUCLEAR MAGNETIC RESONANCE
Magic angle spinning-nuclear magnetic resonance Nuclear magnetic resonance Palygorskite Sepiolite Silicon sites
2011/11/16
DETECTION OF NONEQUIVALENT Si SITES IN SEPIOLITE AND PALYGORSKITE BY SOLID-STATE 29Si MAGIC ANGLE SPINNING-NUCLEAR MAGNETIC RESONANCE.
Role of Ferric Iron in the Oxidation of Hydrocortisone by Sepiolite and Palygorskite
Catalysis Electron spin resonance Hydrocortisone Iron Oxidation Palygorskite Sepiolite
2012/2/6
The role of adsorbed and structural Fe3+ in palygorskite and sepiolite with respect to the oxidation of hydrocortisone in aqueous suspension has been evaluated using electron spin resonance and UV-vis...