Process to produce kno3 of at least 98% from polyhalite comprising contacting the polyhalite with hno3 adding a base to precipitate the sulfate, precipitate the mg, concentrate the solution, precipitate the nacl, separate the kno3 and recycle to the reaction vessel part of the solution remains.

Chile Patent

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Abstract

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THE INVENTION REFERS TO A PROCESS TO PRODUCE KNO3 OF AT LEAST 98% PURITY, FROM POLYHALITE, WHICH INCLUDES CONTACTING THE POLYHALITE WITH A SUBSTANCE CONTAINING HNO3, ADDING A BASE FOR THE SOLUTION -THOLD IN THE SULFATE PRESENT FOR PRECIPITATE SUCH ... SOLUTION, PRECIPITATE THE MG AS MG (OH) 2, BY ADDING AT LEAST ONE BASIC COMPOUND TO THE REMAINING SOLUTION, CONCENTRATE THE OBTAINED SOLUTION, PRECIPITATE THE NACI DERIVED FROM POLYHALITE, SEPARATE SAID PRECIPITATED NACL FROM THE FLOW , SEPARATE AS A SOLID KNO3 AT LEAST PART OF K + AND NO3- CONTAINED IN THE SOLUTION, AND RECYCLE PART OF THE REMAINING SOLUTION TO THE REACTION VESSEL.

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Patent Owner(s)

Patent OwnerAddress
IMI TAMI INSTITUTE RES AND DEVELOPMENT LTDIL

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Inventor(s)

Inventor Name Address
FRIM RON HAIFA
GINZBERG EYAL ZIKHRON-YAAKOV
MOZES AKIVA 75437 RISHON LEZION
BARNEA EYAL 1/1 HASHITA STREET 3680001 NESHER 3680001
KESELMAN HUGO KARMIEL
FRIEDMAN GIDEON 32985 HAIFA
LANGEVELD CORNELIS PETRUS BONAN MICHAEL IL

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