Method for producing fertilizer particles comprising alternative boron sources
AssigneeYara International Asa
InventorsRiccardo Mulato, Amund Myrstad
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Abstract
The present disclosure concerns a method for producing fertilizer particles comprising an alternative source of boron. It is found that certain colemanite and ulexite powders can be supplied to a fertilizer melt shortly before granulation essentially without dissolving into the melt. Accordingly, the fertilizer particles produced from the melt may contain negligible amounts or non-detectable levels of sodium borates or boric acid. Furthermore, the fertilizer particles can be homogeneous which is desirable for boron supplying fertilizers. It is also found that the fertilizer particles can supply boron to plants at a rate comparable to borax pentahydrate.
Claims8
Method for producing fertilizer particles comprising the steps of
- a) forming a fertilizer melt comprising a nitrate salt wherein the fertilizer melt is an NPK melt or a calcium nitrate melt;
- b) adding a boron source in the form of colemanite or ulexite particles with a median particle size in the range 1 to 100 μm to the melt in such a way
- that the colemanite particles or the ulexite particles are in contact with the fertilizer melt for less than 100 seconds if said fertilizer melt is an NPK melt or
- that the colemanite particles or the ulexite particles are in contact with the fertilizer melt for less than 600 seconds if said fertilizer melt is a calcium nitrate melt
- c) granulating homogeneous fertilizer particles from the produced homogeneous fertilizer melt of step b).
Dependencies are inferred from the claim text.