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:
Oct. 28, 2014
Filed:
Jun. 27, 2010
Michael Bonan, Rekhasim, IL;
Eyal Ginzberg, Zikhron-Yaakov, IL;
Akiva Mozes, Rishon Lezion, IL;
Eyal Barnea, Nesher, IL;
Hugo Keselman, Carmiel, IL;
Gideon Friedman, Haifa, IL;
Ron Frim, Haifa Bay, IL;
Cornelis Petrus Langeveld, Zuidoostbeemster, NL;
Michael Bonan, Rekhasim, IL;
Eyal Ginzberg, Zikhron-Yaakov, IL;
Akiva Mozes, Rishon Lezion, IL;
Eyal Barnea, Nesher, IL;
Hugo Keselman, Carmiel, IL;
Gideon Friedman, Haifa, IL;
Ron Frim, Haifa Bay, IL;
Cornelis Petrus Langeveld, Zuidoostbeemster, NL;
IMI TAMI Insitute for Research and Development, Haifa Bay, IL;
Abstract
A process for producing KNO3 from polyhalite to is disclosed. In a preferred embodiment, the process comprises steps of (a) contacting polyhalite with HNO3; (b) adding Ca(OH)2 to the solution, thereby precipitating as CaSO4 at least part of the sulfate present in said solution; (c) precipitating as Mg(OH)2 at least part of the Mg2+ remaining in said solution by further addition of Ca(OH)2 to the remaining solution; (d) concentrating the solution, thereby precipitating as a sulfate compound at least part of the sulfate remaining in solution; (e) separating at least part of the NaCl from the solution remaining; and (f) crystallizing as solid KNO3 at least part of the K+ and NO3-contained in the solution. The process enables direct conversion of polyhalite to KNO3 of purity exceeding 98.5% and that is essentially free of magnesium and sulfate impurities.