Potassium zirconium fluoride

Poto ssium Fluozirconote. See Zirconium Potassium Fluoride (h this Section... 

Aflammit ZR Dipotassium hexafluorozirconate(2-) Dipotassium zirconium hexafluoride EINECS 240-985-6 HSDB 2019 NSC 310011 Potassium fluorozirconate Potassium fluorozirconate (K2ZrF6) Potassium hexafluorozirconate Potassium zirconifluoride Potassium zirconium fluoride Potassium zirconium hexafluoride Zirconate(2-), hexafluoro-, dipotassium Zirconium potassium fluoride, Flameprooflng agent used in wool processing. Also used in manufacture of zirconium. Solid slightly soluble in cold H2O, Thor Chemicals (UK) Ltd. 

Zirconium potassium fluoride. See Zirconium, potassium hexafluoride Zirconium potassium hexafluoride CAS 16923-95-8... 

Synonyms Dipotassium hexafluorozirconate Potassium fluorozirconate Potassium fluozirconate Potassium zirconifluoride Potassium zirconium fluoride Potassium zirconium hexafluoride Zirconium potassium fluoride Definition Zirconium potassium fluoride Empirical FsK2Zr Formula K2ZrFe... 

It was originally separated from zirconium by repeated recrystallization of the double ammonium or potassium fluorides by von Hevesey and Jantzen. Metallic hafnium was first prepared by van Arkel and deBoer by passing the vapor of the tetraiodide over a heated tungsten filament. Almost all hafnium metal now produced is made by reducing the tetrachloride with magnesium or with sodium (Kroll Process). 

Potassium fluoride solution bulky, white precipitate of thorium fluoride, ThF4, insoluble in excess of the reagent (distinction and method of separation for aluminium, beryllium, zirconium, and titanium). 

Zirconium Potossium Fluoride or Potassium Fluozirconate, K2ZrFfl, mw 283.42 wh crysts, sp gr 3.58 sol in hot w, insol in NHS. Can be prepd by treating a KF soln with. an excess of ZrF4 soln (Ref 1). Used in prepn of metallic Zr... 

For less activated aromatic systems (those without a nitro substituent), the halogcn-ex-changc reaction has been investigated with potassium fluoride in a variety of polar aprotic solvents in the presence or absence of a catalyst (see Table 13). Many different types of catalysts have been investigated these include crown ethers, quaternary ammonium salts, 3,164 pjjos-phonium salts, aminophosphonium salts, compounds containing a phosphorus and an amino function, and inorganic fluorides of boron, aluminum, tin, phosphorus, titanium and zirconium. Different forms of potassium fluoride have been used these include spray-dried potassium fluoride, freeze-dried potassium fluoride, potassium fluoride recryslal-lized from methanol, and potassium fluoride dispersed on caleium fluoride. ... 

Fractional crystallization of the double potassium fluorides was the method originally used to separate hafnium from zirconium. Because these salts form solid solutions and the ratio of solubilities is close to unity (1.54 at 20°C), multiple recrystallizations are necessary for the necessary completeness of separation. In the United States, Kawecki [Kl] has found that 10 recrystaUizations of the double potassium fluorides reduced the hafnium content of zirconium from 2.0 to 0.1 percent. 

Potassium zirconium carbonate. See Zirconium potassium carbonate Potassium zirconium fluoride Potassium zirconium hexafluoride. See Zirconium potassium hexafluoride Potassuril. See Potassium D-gluconate Potato alcohol. See Alcohol denatured Potato extract. See Potato (Solanum tuberosum) extract... 

Pansy (Viola tricolor) extract Pentasodium triphosphate Phenyl salicylate Potassium fluoride Propionaldehyde Sodium ascorbate Sodium bisulfate Sodium sulfate Thiodipropionitrile Thymol Zirconium nitrate preservative mfg. 

Boric acid Copper oxide (ic) Lithium chloride Lithium fluoride Potassium tetraborate Tributyl borate Zirconium potassium hexafluoride welding flux, gaseous Trimethyl borate welding fluxes, special Zirconium welding gas Oxygen... 

Preparing metallic zirconium turned out to be not so simple. In 1808 H. Davy tried in vain to decompose zirconium earth with electric current. It was not before 1824 that Berzelius obtained contaminated zirconium by heating a dry mixture of potassium, potassium fluoride, and zirconium in a platinum crucible. Zirconium received its name from the mineral. 

Although zirconium has good corrosion resistance in sodium fluoride and potassium fluoride at low temperatures, its resistance decreases rapidly with increasing temperature or decreasing pH. Consequently, zirconium is not ideal for handling most fluoride-containing solutions unless fluoride ions are complexed. 

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