PRODUCING GREEN DYE FROM MIXED RARE-EARTH AND MOLYBDENUM COMPOUNDS AND METHOD OF MAKING SURFACE COATINGS THEREFROM Russian patent published in 2014 - IPC C09C3/04 C01G39/00 C01F17/00 C08J3/20 

FIELD: chemistry.

SUBSTANCE: invention relates to a novel inorganic green pigment for dyeing different materials. The pigment has the formula RE₂MoO₆, where RE denotes mixed rare-earth metals in amount of 66.66 mol %, Mo denotes molybdenum in amount of 33.34 mol %. The mixed rare-earth metals are a mixture of rare-earth elements with atomic number from 57 to 66. The metals include at least 43-45 wt % lanthanum, 33-35 wt % neodymium, 9-10 wt % praseodymium, 4-5 wt % samarium and other rare-earth elements selected from cerium, dysprosium, gadolinium, europium, terbium and yttrium in amount of 5 wt %. The pigment is obtained by mixing solid phases of a carbonate of said mixture of rare-earth elements and ammonium heptamolybdate, calcining the mixture at 900-1100°C for 3-6 hours while heating at a rate of 10°C/min, followed by grinding.

EFFECT: invention enables to obtain an environmentally safe and cost-effective green pigment for making heat-resistant coatings on different substrates.

9 cl, 4 dwg, 4 ex