METHOD FOR DYEING MINERAL FERTILIZERS Russian patent published in 2004 - IPC

FIELD: agriculture. SUBSTANCE: the present innovation deals with obtaining granules of mineral fertilizers of different types with distinctive coloring. It deals with mixing the fuse of mineral fertilizer at weight portion of moisture being 0.2- 0.7%, in particular, the fuse of nitroammophoska, with pigments that should be dosed in dry form and granulating the mixture, moreover, as pigments one should apply red, yellow, brown and black iron oxide pigments, iron oxides (II and III) being their foundation, moreover, pigments should be added into the fuse of mineral fertilizer at the following quantities: red pigment 0.08-1.8%, yellow pigment 0.3-0.7%, brown pigment 1.0-1.5%, black pigment 1-1.5% against ready-to-use product. The present method enables to improve appearance of granulated fertilizers, obtain complicated mineral fertilizers being homogeneous by color, obtain proper color to differentiate fertilizers of one and the same type by brands, and/or against different types of fertilizers, and/or fertilizers of other manufacturers at simultaneous simplifying the process without decreasing physico- mechanical properties of the product. EFFECT: higher efficiency. 4 cl, 1 ex, 1 tbl