Process for coating granular fertilizers with chelated micronutr

Details Process for coating granular fertilizers with chelated micronutr Process for coating granular fertilizers with chelated micronutr

1974-07-22

1976-06-08

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

71 64E, 71DIG2, C05G 300

Patent

active

039619320

ABSTRACT:
A process for uniformly coating granular fertilizer formulations with one or more chelated metallic micronutrients which comprises the following steps: blending a granular fertilizer formulation in, for instance, a rotary drum mixer; spraying, while the blending continues 1 to 5% by weight of an aqueous solution or slurry containing one or more chelated metallic micronutrients, as for example, Na.sub.2 Zn EDTA, onto said fertilizer formulation; and adding, before or after said spraying, and while the blending continues 1 to 4% by weight of a finely divided water-absorbent additive, such as, a synthetic calcium silicate or finely divided silica, to the fertilizer formulation. The finished fertilizer formulation then contains 0.05 to 0.5% by weight of micronutrient.

REFERENCES:
patent: 2931716 (1960-04-01), Kelley et al.
patent: 3520651 (1970-07-01), Philen et al.
patent: 3852055 (1974-12-01), Hawkes et al.

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