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VANADIUM AND MOLYBDENUM COMPOUNDS IN CLAYS 1
Author(s) -
PALMER L. A.
Publication year - 1929
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1929.tb16894.x
Subject(s) - efflorescence , vanadium , molybdenum , alkali metal , chemistry , inorganic chemistry , sodium , fluoride , mineralogy , materials science , metallurgy , organic chemistry
Eight different light‐firing clays and shales containing small amounts of insoluble vanadium and molybdenum compounds were studied. It was found that during firing, soluble salts of these elements were formed which later appeared as a green‐yellow efflorescence on the fired clay. The color of the efflorescence was chiefly due to alkali vanadates. It was found that the use of either sodium fluosilicate or calcium fluoride is effective in eliminating the green‐yellow efflorescence. The use of these chemicals is usually a more economical procedure than either hard firing or the use of lead compounds. The results of various trial firings made with clays to which were added varying amounts of several different chemicals are given.