Safe blends of ammonium nitrate (AN) with urea, or of an AN-comprising product with a urea-comprising product

Patent metadata

Field	Value
Publication number	US-9284232-B2
Application number	US-201314415809-A
Country	US
Kind code	B2
Filing date	Aug 28, 2013
Priority date	Aug 29, 2012
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

The present invention relates to a solid blend of urea based and ammonium nitrate based particles, the blend comprising ammonium nitrate based particles with salts able to bind crystallization water and urea particles with ammonium sulphate.

First claim

The invention claimed is:

1. A solid blend comprising urea based particles and ammonium nitrate based particles,
wherein the ammonium nitrate based particles comprise salts able to bind crystallization water, and the urea based particles comprise ammonium sulphate, and
wherein the parts of the urea based particles comprising ammonium sulphate, which are in contact with the ammonium nitrate based particles, contain 42% N or less.

2. The blend according to claim 1 ,
wherein the salt is selected from the group consisting of magnesium nitrate, magnesium sulphate, aluminium sulphate and mixtures thereof.

3. The blend according to claim 1 , wherein the salt amount is 0.1-50 weight % of the ammonium nitrate based particles.

4. The blend according to claim 1 ,
wherein the ammonium sulphate in the urea particles comprising ammonium sulphate is distributed in the mass of the particle.

5. The blend according to claim 1 ,
wherein the urea particles comprising ammonium sulphate have an external layer of urea ammonium sulphate.

6. The blend according to claim 1 , comprising more than 40 weight % of urea particles comprising ammonium sulphate.

7. The blend according to claim 1 ,
further comprising a colouring agent, wherein the colouring agent is distributed throughout the particles and/or is external at the surface of the particles.

8. The blend according to claim 1 ,
wherein the urea based particles and the ammonium nitrate based particles have a similar size and particle size distribution, and particle density within the same range.

9. The blend according to claim 3 , wherein the salt amount is 0.5-3 weight % of the ammonium nitrate based particles.

10. A process for the manufacturing of a solid blend according to claim 1 , the process comprising the steps of
ia) mixing ammonium sulphate with urea, and forming urea based particles having ammonium sulphate distributed throughout the particles; or
ib) forming urea based particles comprising an external layer comprising ammonium sulphate; and
ii) mixing a salt, able to bind crystallization water, with an ammonium nitrate source and forming ammonium nitrate based particles comprising said salt; and
iii) blending the particles of step ia) and/or ib) and ii), wherein the parts of the urea based particles comprising ammonium sulphate, which are in contact with the ammonium nitrate based particles, contain 42% N or less.

11. A process according to claim 10 , wherein the salt is selected from the group consisting of magnesium nitrate, magnesium sulphate, aluminium sulphate and mixtures thereof.

Assignees

• Yara Int Asa

Inventors

• Ledoux Francois
• Winne Erika
• Nygaard Erik C

Classifications

• C05C1/00 Primary

  Ammonium nitrate fertilisers · CPC title

• C05C9/005

  Post-treatment · CPC title

• C05G3/00 Primary

  Mixtures of one or more fertilisers with additives not having a specially fertilising activity · CPC title

• C05C3/00

  Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor · CPC title

• C05G5/30

  Layered or coated, e.g. dust-preventing coatings · CPC title