Potassium hexafluorozirconate
{{Chembox
| Name = Potassium hexafluorozirconate
| ImageFile1 = Kaliumhexafluorozirconat.png
| ImageSize1 = 200px
| ImageFile2 =
| ImageSize2 = 200px
| IUPACName =
| PIN =
| OtherNames = dipotassium hexafluorozirconate, potassium zirconium hexafluoride, potassium fluorozirconate
|Section1={{Chembox Identifiers
| CASNo = 16923-95-8
| CASNo_Ref = {{cascite|correct|CAS}}
| ChemSpiderID = 11221760
| ChEBI =
| DTXSID = DTXSID00893979
| EINECS = 240-985-6
| Gmelin =
| PubChem = 56828182
| SMILES = F[Zr-2](F)(F)(F)(F)F.[K+].[K+]
| StdInChI= 1S/6FH.2K.Zr/h6*1H;;;/q;;;;;;2*+1;+4/p-6
| StdInChIKey = BJZIJOLEWHWTJO-UHFFFAOYSA-H
}}
|Section2={{Chembox Properties
| K=2 | Zr=1 | F=6
| Appearance = white crystalline powder
| Density = 3.48 g/cm3
| MeltingPtC =
| BoilingPtC =
| Solubility = soluble
}}
|Section3={{Chembox Hazards
| MainHazards =
| GHS_ref =
| GHSPictograms = {{GHS06}}
| GHSSignalWord = Danger
| HPhrases = {{HPhrases|301|315|319|335}}
| PPhrases = {{PPhrases|301|310|330|302|352|305|351}}
}}
|Section6={{Chembox Related
| OtherCompounds =
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Potassium hexafluorozirconate is an inorganic compound of potassium, fluorine, and zirconium with the chemical formula {{chem2|K2ZrF6}}.{{cite web |title=Potassium Hexafluorozirconate |url=https://www.americanelements.com/potassium-hexafluorozirconate-16923-95-8 |website=American Elements |access-date=26 February 2024 |language=en}}{{cite web |title=Potassium hexafluorozirconate |url=https://www.sigmaaldrich.com/RU/en/product/aldrich/336688 |publisher=Sigma Aldrich |access-date=26 February 2024}}
Preparation
Potassium hexafluorozirconate can be prepared from precipitation from solutions:
:{{chem2|2KF + ZrF4 -> K2ZrF6↓}}
:{{chem2|2KCl + (NH4)2ZrF6 -> K2ZrF6↓ + 2NH4Cl}}
Also, in industry, it is obtained by sintering zirconium ore concentrates with {{chem2|K2SiF6}} at 600–700 °C.{{cite book |last1=Lewis |first1=Alison |last2=Olsen |first2=Christine |title=BIWIC 2007: 14th International Workshop on Industrial Crystallization : September 9th-11th, 2007, University of Cape Town, Cape Town, South Africa |date=2007 |publisher=IOS Press |isbn=978-1-58603-790-1 |page=186 |url=https://books.google.com/books?id=soDe0QLEefsC&dq=Potassium+hexafluorozirconate&pg=PA186 |access-date=26 February 2024 |language=en}}
Physical properties
Potassium hexafluorozirconate forms an odorless white crystalline powder.
It crystallizes in the monoclinic space group C 2/c (space group No. 15).{{cite journal |last1=Hoppe |first1=R. |last2=Mehlhorn |first2=B. |title=Die Kristallstruktur von K 2 ZrF 6 |journal=Zeitschrift für anorganische und allgemeine Chemie |date=September 1976 |volume=425 |issue=3 |pages=200–208 |doi=10.1002/zaac.19764250303 |url=https://onlinelibrary.wiley.com/doi/10.1002/zaac.19764250303 |access-date=26 February 2024|url-access=subscription }}
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,{{cite book |last1=Lewis |first1=David M. |last2=Rippon |first2=John A. |title=The Coloration of Wool and Other Keratin Fibres |date=20 May 2013 |publisher=John Wiley & Sons |isbn=978-1-118-62509-5 |page=115 |url=https://books.google.com/books?id=-CxOUlZmFQcC&dq=Potassium+hexafluorozirconate&pg=PA115 |access-date=26 February 2024 |language=en}} grain refining agent in magnesium and aluminum alloys, welding flux, and optical glass component.{{cite web |title=Potassium hexafluorozirconate {{!}} CAS 16923-95-8 {{!}} Connect Chemicals |url=https://connectchemicals.com/en/product-finder/potassium-hexafluorozirconate |publisher=connectchemicals.com |access-date=26 February 2024}}
References
{{Reflist}}
{{Zirconium compounds}}
{{Potassium compounds}}
{{Fluorine compounds}}