公开(公告)号：US20170066692A1

公开(公告)日：2017-03-09

申请号：US15122756

申请日：2015-03-03

Applicant: YARA INTERNATIONAL ASA

Inventor： Francois LEDOUX

IPC: C05C1/02 ,  C05G3/00 ,  B01J2/30 ,  C05B17/00

CPC classification number: C05C1/02 ,  B01J2/30 ,  C05B17/00 ,  C05C1/00 ,  C05D9/02 ,  C05G3/0041 ,  C05G3/0088 ,  C09D1/00

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 acidifled 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.

Abstract translation: 本发明涉及一种提供硝酸铵（AN）的颗粒，特别是用作肥料的硝酸铵基颗粒的无机涂层以及用于硝酸铵基颗粒本身的无机涂层的方法。 该方法包括以下步骤：a）将水含量低于50重量％的液体浓缩无机酸施用于颗粒，以至少在颗粒的外表面溶解硝酸铵，使得酸化颗粒 并且b）将粉末状的固态矿物碱溶液施加到步骤a）的颗粒中，以与颗粒的把持层反应以涂覆酸化的颗粒表面; 其中粉末状固体无机碱与浓缩无机酸的化学计量比等于或大于5:1。