US 11,655,196 B2
Granules of polyhalite and urea
Khalil Abu-Rabeah, Beer Sheva (IL); and Natalia Geinik, Arad (IL)
Appl. No. 17/620,132
Filed by ICL EUROPE COOPERATIEF U.A., Amsterdam (NL)
PCT Filed Aug. 24, 2020, PCT No. PCT/IL2020/050922
§ 371(c)(1), (2) Date Dec. 17, 2021,
PCT Pub. No. WO2021/059261, PCT Pub. Date Apr. 1, 2021.
Claims priority of provisional application 62/904,771, filed on Sep. 24, 2019.
Prior Publication US 2022/0259115 A1, Aug. 18, 2022
Int. Cl. C05G 1/00 (2006.01); C05G 5/12 (2020.01); C05G 5/30 (2020.01); C05C 3/00 (2006.01); C05C 9/00 (2006.01); C05D 1/00 (2006.01); C05D 1/02 (2006.01)
CPC C05G 1/00 (2013.01) [C05C 3/005 (2013.01); C05C 9/005 (2013.01); C05D 1/005 (2013.01); C05D 1/02 (2013.01); C05G 5/12 (2020.02); C05G 5/30 (2020.02)] 10 Claims
 
1. A fertilizer granule comprising Urea, Polyhalite and Ammonium Sulphate contained in a core of said granule.
 
9. A process for the production of a fertilizer comprising:
mixing a feed of Polyhalite with a feed of urea, magnesite, clay and sulfuric acid to yield a mixture;
adding Ammonia to the mixture which causes a chemical reaction between the Ammonia and the sulphuric acid to yield an exothermic reaction causing melting of the urea, thereby providing a mixture with melted urea;
granulating the mixture with the melted urea in a drum granulator to yield particle masses; and
screening said particle masses in a screener to yield different fractions in three different sizes: Oversized particles (above 4.75 mm) which undergo a crushing process and are returned to the granulator as recycle, desired size granular particles (from 2 to 4.75 mm), and fine particles (below 2 mm) which are transferred back to the mixture.