Potassium silicofluoride

Potassium fluoride, KF.—The fluoride is produced by the interaction of hydrofluoric acid and potassium carbonate or hydroxide by heating potassium silicofluoride or borofluoride with lime and by the action of potassium on fluorine, hydrofluoric add, or silicon fluoride or boride. 

Gold and Silicon.—Gold docs not take up silicon directly,7 but can be made to absorb up to 10 per cent, by heating with sodium under a layer of potassium silicofluoride. Alloys with 10 per cent, of silicon are grey in colour and very brittle.8... 

Manufacture. This is obtained by reducing silica sand with carbon in an electric furnace(amorphous silicon), or by reducing potassium silicofluoride with metallic aluminium, potassium or sodium(crystalline silicon). 

Synonyms Potassium fluorosilicate (INCI) Potassium hexafluorosilicate Potassium silicofluoride Silicate, hexafluoro-, dipotassium... 

A process is operated in the U.S.S.R., on a production scale for the breakdown of zircon by sintering with potassium silicofluoride. The principal reason for the employment of this route is the fact that the product potassium fluorozirconate, is suitable for feeding directly to the Russian fractional crystallization purification process. This removes the 1-5 to 2-5 per cent of hafnium which originates in the zircon mineral. 

Inorganic Nomenclature. Compounds may be named in German merely by compounding the names of the elements as, Jodkalium (potassium iodide), SHiziumfiuorwasserstoff (hydrogen silicofluoride, fluosihcic acid). Words formed from the names of two elements are usually to be translated by giving the -ide ending to the first part (Jodkalium, potassium iodide). 

Preparation.—1. By heating potassic silicofluoride with potassium —... 

Oils Edible Safflower Potassium Binoxalate Ammonium Chloride Salicylic Acid Ammonium Chloride Lead Acetate Potassium Binoxalate Sodium Silicofluoride Ammonium Carbonate Fluocilicic Acid P-Dichlorobenzene Ammonium Phosphate Sec-Butyl Acetate Sec-Butyl Alcohol Calcium Phosphate Selenium Trioxide Selenium Dioxide Selenium Dioxide Selenium Dioxide Selenium Trioxide Antimony Trioxide Calcium Hypochlorite Carbaryl Cyclohexanone Charcoal... 

If the color of flame.is. violet, the salt is fairly pure(Ref l,p 141 Ref 3,p 862). K can be identified by pptg it as K2NaCo(N02)g, as well as by potassium salts of chloro-platinate, perchlorate) acid tartrate, picrate, silicofluoride, etc(Ref 3,p 862). Various quantitative methods for detn of K ion are given in Refs 3,4,4a 8... 

IV.27 HEXAFLUOROSILICATES (SILICOFLUORIDES), [SiF6]2 Solubility Most metallic hexafluorosilicates (with the exception of the barium and potassium salts which are sparingly soluble), are soluble in water. A solution of the acid (hydrofluosilicic acid H2[SiF6]) is one of the products of the action of water upon silicon tetrailuoride, and is also formed by dissolving silica in hydrofluoric acid. 

The chlorate is purified from the chloride by fractional crystallization. In Muspratt s method10 magnesium oxide suspended in water is substituted for sodium hydroxide, the solution being concentrated after treatment with chlorine, and sodium carbonate added to precipitate the magnesium for further use. The sodium chlorate crystallizes from the mother-liquor. The salt is also formed from potassium chlorate by double decomposition with substances such as sodium hydrogen tartrate and sodium silicofluoride, as well as by the electrolytic decomposition of sodium-chloride solution under certain conditions11 (p. 97). 

Rubidium salts impart a reddish-violet coloration to the Bunsen flame, similar to that characteristic of potassium derivatives. Like potassium, rubidium forms several salts not readily soluble, among them the chloroplatinate, perchlorate, silicofluoride, bismuth thiosulphate, and primary tartrate. It can also be detected by the formation of Bi(N02)3,2RbN02,NaN02, a yellow crystalline precipitate produced by adding a solution of bismuth nitrate and sodium nitrite to one of a rubidium salt.2... 

The freshly prepared violet solution of chromium silicofluoride reacts with potassium chloride, thus ... 

The names sodium borohydride and lithium aluminum hydride (8) are not constructed on any established nomenclature pattern unless it be rapidly disappearing one represented by sodium silicofluoride and potassium ferrocyanide. 

Table 6 summarizes the characteristics of these three commercial available chemicals. Water fluoridahon has also been accomplished with ammonium silicofluoride, calcium fluoride, hydrofluoric acid, magnesium silicofluoride and potassium fluoride (5). 

Scandium is usually present in rare earth minerals in small amounts (the rare mineral thortveitite containing 37 per cent SC2O3 is an exception). It collects in the soluble end of the bro-mate fractionations, but it is easily separated from the other soluble salts by the fact that it is the least basic of the whole group. Consequently, fractional precipitation or fusion of the nitrates concentrates the scandium rapidly. Scandium may also be precipitated from boiling acid solution by sodium silicofluoride its double ammonium tartrate and double potassium sulfate are also difficultly soluble. 

Silicon is best obtained by heating potassium with silicofluoride of potassium, 3KF +2Si F, which with 6 eqs. of potassium yields 9 KF + Si,. Water dissolves off the fluoride of potassium, and leaves the silicon as a dark brown powder, which contains some hydrogen, and is purified by exposure to a low red heat. Silicon is infusible, and after having been ignited in close vessels it is so compact as not to bum when heated even in oxygen. It... 

Lastly,hydrofluosilicic acid causes a gelatinous semi-transparent precipitate of silicofluoride of potassium, when added to solutions of potash of all these tests, the most certain is the bichloride of platinum, with the aid of alcohol. 

Ammonium chloride Ferric chloride Ferric chloride hexahydrate Potassium ferricyanide Triethylene diamine etchant ingredient, aluminum Ammonium sulfate Sodium chromate Sodium glucoheptonate Sodium nitrate Sodium silicofluoride etchant, ABS Chromic acid etchant, aluminum Ammonium bifluoride... 

Ammonium fluoride Ammonium silicofluoride etching, zinc printing Chloroplatinic acid etching/frosting glass Potassium bifluoride Potassium fluoride ethanol mfg. 

Ammonium xylenesulfonate Dextrin Glyoxal Potassium alum dodecahydrate Sodium silicofluoride glue additive, leather Sodium xylenesulfonate... 

Hydrogen cyanide Iron oxide black Mercury chloride (ic) Nickel cyanide Nitric acid Sodium chloride Sulfurous acid Zirconium potassium hexafluoride metallurgy, aluminum Sodium silicofluoride metallurgy, beryllium Sodium silicofluoride metallurgy, ore separation Phosgene metals... 

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