Iron removal from a kaolinitic clay by leaching to obtain high whiteness index

Autor:	R A Hernández Hernández, A Martínez Luévanos, L.E. Hernández Cruz, F Legorreta García
Rok vydání:	2013
Předmět:	inorganic chemicals Acid concentration Materials science Initial sample Oxalic acid Mineralogy law.invention chemistry.chemical_compound chemistry law Iron removal Kaolinite Leaching (metallurgy) Atomic absorption spectroscopy Magnetite Nuclear chemistry
Zdroj:	IOP Conference Series: Materials Science and Engineering. 45:012002
ISSN:	1757-899X 1757-8981
DOI:	10.1088/1757-899x/45/1/012002
Popis:	Beige kaolin clays were crushed and sieved. The mineral was characterized by X-ray diffraction and chemically analyzed by atomic absorption spectrophotometry. The material below 37 microns was leached with oxalic acid. A study of main variables of the leaching process in different ranges was realized: time (0 to 120 min), temperature (25 to 100 °C) and acid concentration (0.01 to 0.5 M). Crystallographic analysis of the initial sample indicates the presence of kaolinite, iron oxides in the form of magnetite and iron-titanium oxides. By this method it was possible to obtain iron extraction percentages over 80% and whiteness index above to 90%.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c11b46c766ac729a9a2d744a243b9b4c https://doi.org/10.1088/1757-899x/45/1/012002 Zobrazit plný text záznamu