Thermogravimetric and specific heat determinations of a commercial preconcentrated sample of ulexite, between room temperature and 1,000 ºC

Autor:	Horacio Ricardo Flores, Silvana Karina Valdez
Rok vydání:	2006
Předmět:	Isoperibol calorimeter Specific heat Chemistry Thermal decomposition Metals and Alloys Analytical chemistry Mineralogy engineering.material Condensed Matter Physics law.invention Ulexite law Materials Chemistry engineering Calcination Physical and Theoretical Chemistry
Zdroj:	Revista de Metalurgia. 42
ISSN:	1988-4222 0034-8570
DOI:	10.3989/revmetalm.2006.v42.i6.38
Popis:	The important amount of hydration water in the ulexite (NaCaB5O9.8H2O), allows using calcination methods to increase its B2O3 content. This paper analyses the thermal decomposition reaction of a preconcentrated ulexite through weight loss measurements, which occur during the heating of samples until 1000 oC. Determinations of heat content at each temperature were made using an isoperibol calorimeter. The mean specific heat was calculated from these values, and its dependence on temperature was determined. The maximum weight loss was about 32.5 % and the specific heat obtained was 1,13 kJ/kgoC for solid samples and 1,38 kJ/kgoC for fluid samples.The results are useful for the design of the industrial process, in order to determine the thermal requirements for heating calcined ulexite, and to obtain smelted ulexite.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e7469b92bad419b68c8f299fa5f0d220 https://doi.org/10.3989/revmetalm.2006.v42.i6.38 Zobrazit plný text záznamu