Fertilizer pellets with micronized sulphur
OwnerSatish Iyer, Eric Pedersen +2inventors
InventorsSatish Iyer, Eric Pedersen, Richard Knoll, Babasola Ajiboye
Life of this patent
Estimating the term…
Abstract
Fertilizer pellets may be formed by compressing or compacting a primary fertilizer powder mixed with micronized sulphur.
Claims8
A method of producing a compacted fertilizer pellet, comprising the steps of grinding a water-soluble NPK fertilizer to produce a fertilizer powder having an average particle size between about 100 microns to about 300 microns, adding micronized sulphur in a quantity between about 1% to about 30% dry weight to produce a mixture, blending the mixture and compacting into cohered pellets, using a pressure greater than about 10 Ksi, resulting in pellets having a crush strength greater than about 50 pounds (22.7 kg) per pellet.
A fertilizer pellet produced by compaction using a pressure greater than about 10 Ksi, comprising a water soluble NPK fertilizer having an average particle size between about 100 microns to about 300 microns and micronized elemental sulphur in a quantity between about 1% and 30% by dry weight, the pellet having a density greater than about 1.50 g/ cm3, and a crush strength greater than about 50 pounds (22.7 kg).
A method of forming a fertilizer pellet, comprising the steps of:
- (a) forming a fertilizer powder comprising an NPK fertilizer and having an average particle size of less than about 1 mm, and adding micronized sulphur particles in a quantity of between about 10% to about 30% dry weight to the fertilizer powder;
- (b) adjusting the moisture content of the fertilizer powder to between about 5% to about 25% water (w/w);
- (c) forming pellets from the fertilizer powder using a compression pelletizing method;
- and
- (d) screening undersize and oversize material after the pellet forming step to a recycle stream, wherein the recycle stream comprises less than a 300% recycle ratio on a dry weight basis.
Dependencies are inferred from the claim text.