The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 01, 2019
Filed:
Mar. 03, 2015
Yara International Asa, Oslo, NO;
Francois Ledoux, Cormeilles en Parisis, FR;
YARA INTERNATIONAL ASA, Oslo, NO;
Abstract
The invention relates to a method for providing an inorganic coating to ammonium nitrate (AN) based particles, in particular to ammonium nitrate-based particles for use as a fertilizer, as well as to an inorganic coating for ammonium nitrate-based particles per se. The method comprises the steps of: a) applying a liquid concentrated mineral acid with a water content of less than 50 weight %, to the particles, in order to at least solubilize ammonium nitrate at the outer surface of the particles such that an acidified particle grasping layer is obtained, and b) applying a solid mineral alkaline in powder form to the particles of step a) in order to react with the grasping layer of the particles to coat the acidified particle surface; wherein the stoichiometric ratio of solid mineral alkaline in powder form to concentrated mineral acid is equal to or more than 5:1.