Studies on the system sodium oxide-calcium oxide-silica-water

Autor:	Cameron G. Ramsay, H. F. W. Taylor, Elizabeth A. Blakeman, J. Alan Gard
Rok vydání:	1974
Předmět:	inorganic chemicals Aqueous solution Xonotlite Chemistry Sodium oxide Pectolite Inorganic chemistry food and beverages Tobermorite carbohydrates (lipids) Reaction rate stomatognathic diseases chemistry.chemical_compound fluids and secretions Calcium oxide Quartz
Zdroj:	Journal of Applied Chemistry and Biotechnology. 24:239-245
ISSN:	1935-0554 0375-9210
Popis:	In hydrothermal reactions of lime and quartz with water or aqueous NaOH at 150 °C or 180 °C and Ca: Si = 0.83, the rate of reaction of the quartz increases with NaOH concentration. At 180 °C and Ca: Si = 0.83, the conversion into tobermorite of the semi-crystalline calcium hydrosilicate initially formed occurs more slowly at NaOH concentrations of 0.15–2.00 M (NaOH: SiO2 = 0.05 to 0.63) than in water or 5 M-NaOH. With long reaction times at 180 °C and Ca: Si = 0.83, increasing NaOH concentration causes pectolite to replace xonotlite as the main product. At very low water contents, NaCaHSiO4 is formed; this compound is conveniently made by grinding together solid NaOH, Ca(OH)2 and quartz in normally humid air and heating the mixture in a closed vessel at 180 °C.
Databáze:	OpenAIRE
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