	US 11,702,348 B2
	Purified potassium hexafluoromanganate and methods for purifying potassium hexafluoromanganate
William Winder Beers, Chesterland, OH (US); James E. Murphy, Niskayuna, NY (US); and John Matthew Root, East Cleveland, OH (US)
Assigned to CURRENT LIGHTING SOLUTIONS, LLC, Beachwood, OH (US)
Filed by Current Lighting Solutions, LLC, East Cleveland, OH (US)
Filed on Aug. 19, 2016, as Appl. No. 15/241,758.
Prior Publication US 2018/0050923 A1, Feb. 22, 2018
Int. Cl. C01G 45/06 (2006.01); C01G 45/00 (2006.01); C09K 11/61 (2006.01)

CPC C01G 45/06 (2013.01) [C01G 45/006 (2013.01); C09K 11/616 (2013.01); C01P 2006/80 (2013.01)]

3 Claims

1. A method comprising:

obtaining a first solution comprising potassium hexafluoromanganate (K₂MnF₆) and one or more impurities, wherein the first solution is prepared at an elevated temperature in a range of between sixty-five and seventy-five degrees Celsius;

filtering the first solution of the potassium hexafluoromanganate and the one or more impurities to form a filtrate; and

separating the potassium hexafluoromanganate from the one or more impurities by crystallizing the filtrate, wherein separating the potassium hexafluoromanganate from the one or more impurities comprises crystallizing the filtrate by:

adding a potassium containing solution to the filtrate to form a second solution; and

cooling the second solution by exposing the second solution to a temperature less than the elevated temperature;

and

wherein the crystallized filtrate of potassium hexafluoromanganate has no more than forty parts per million of calcium.