Potassium hexafluorozirconate

Potassium hexafluorozirconate is an inorganic compound of potassium, fluorine, and zirconium with the chemical formula K₂ZrF₆.^[1][2]

Potassium hexafluorozirconate

Names
Other names dipotassium hexafluorozirconate, potassium zirconium hexafluoride, potassium fluorozirconate
Identifiers
CAS Number	16923-95-8 Y
3D model (JSmol)	Interactive image
ChemSpider	11221760
ECHA InfoCard	100.037.244
EC Number	240-985-6
PubChem CID	56828182
CompTox Dashboard (EPA)	DTXSID00893979
InChI InChI=1S/6FH.2K.Zr/h6*1H;;;/q;;;;;;2*+1;+4/p-6 Key: BJZIJOLEWHWTJO-UHFFFAOYSA-H
SMILES F[Zr-2](F)(F)(F)(F)F.[K+].[K+]
Properties
Chemical formula	F6K2Zr
Molar mass	283.411 g·mol−1
Appearance	white crystalline powder
Density	3.48 g/cm3
Solubility in water	soluble
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H315, H319, H335
Precautionary statements	P301, P302, P305, P310, P330, P351, P352
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Preparation

Potassium hexafluorozirconate can be prepared from precipitation from solutions:

2KF + ZrF₄ → K₂ZrF₆↓

2KCl + (NH₄)₂ZrF₆ → K₂ZrF₆↓ + 2NH₄Cl

Also, in industry, it is obtained by sintering zirconium ore concentrates with K₂SiF₆ at 600–700 °C.^[3]

Physical properties

Potassium hexafluorozirconate forms an odorless white crystalline powder.

It crystallizes in the monoclinic space group C 2/c (space group No. 15).^[4]

Uses

Potassium hexafluorozirconate is used as an intermediate product in the electrolytic production of metallic zirconium.

It is also used as a flame retardant for wool,^[5] grain refining agent in magnesium and aluminum alloys, welding flux, and optical glass component.^[6]