PREPARATION OF GRAYISH GREEN COLORING AGENT OF ZIRCONIUM SILICATE/VANADIUM OXIDE BASE

摘要

To prepare grey-green pigments based on zirconium silicate/vanadium oxide, mixtures of zirconium oxide and silicon oxide are ignited at above 600 DEG C in the presence of compounds of vanadium and lithium, it being necessary for more than 17 % by weight of V2O5 to be present and for sufficient lithium compounds to be present that the Li:Li + V atomic ratio is between 0.1 and 0.5.