Methods and systems for coating granular substrates
AssigneeEverris International B.V.
InventorsMarcus Anthony Bertin, Laurence G. Dammann, Robert M. A. Radabaugh, Arthur R. Shirley, Willem L. C. van Pol
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Abstract
A process for producing a coated particle to provide controlled release characteristics. In this process the mixing of the substrate and coating is made in a mixing device and that mixture is then transferred to a reactor vessel different from the mixing device where the chemical curing of the coating over the particles takes place. Several layers of coating can be applied by repeating the steps and it can be run in a fully continuous manner.
Claims16
A method of coating a granular fertilizer comprising the steps of:
- (a) a mixing process comprising admixing the granular fertilizer and a curable thermoset resin in a mixing device to form a coated mixture, wherein the mixing device is a pugmill, paddle mixer, ribbon blender, pin mixer, measuring mixer, or nauta mixer;
- and
- (b) transferring said coated mixture into a separate reactor, and a curing process comprising curing said coated mixture in the reactor to form a coated substrate;
- wherein the mixing device is separate and distinct from the reactor;
- wherein the method further comprises adding a catalyst to the reactor;
- wherein the mixing process and the curing process are segregated.
A method of preparing controlled-release fertilizer comprising the steps of:
- (a) a mixing process comprising admixing a granular fertilizer and a curable thermoset resin in a mixing device to form a coated mixture, wherein the mixing device is a pugmill, paddle mixer, ribbon blender, pin mixer, measuring mixer, or nauta mixer;
- and
- (b) transferring said coated mixture into a separate reactor, and a curing process comprising curing said coated mixture in the reactor to form a coated substrate,
- wherein the mixing device is separate and distinct from the reactor;
- wherein the method further comprises of adding a catalyst to the reactor;
- wherein the mixing process and the curing process are segregated.
Dependencies are inferred from the claim text.