Ferricyanide calcium-potassium

Calcium potassium ferricyanide, CaK.Fe(CN)6.3H20, crystallises in deep red plates, and is more stable than the simple calcium salt. 

Cyanide occurs most commonly as hydrogen cyanide in water, although it can also occur as the cyanide ion, alkali and alkaline earth metal cyanides (potassium cyanide, sodium cyanide, calcium cyanide), relatively stable metallocyanide complexes (ferricyanide complex [Fe(CN)6]-3), moderately stable metallocyanide complexes (complex nickel and copper cyanide), or easily decomposable metallocyanide complexes (zinc cyanide [Zn(CN)2], cadmium cyanide [Cd(CN)2]). Hydrogen cyanide and cyanide ion combined are commonly termed free cyanide. The environmental fate of these cyanide compounds varies widely (Callahan et al. 1979). 

When potassium ferricyanide is warmed with a solution of bleaching powder to 70° C. a considerable evolution of gas takes place, and a reddish deposit of ferric oxide and calcium carbonate is formed. The filtered solution is concentrated and the potassium nitroprusside extracted with alcohol, and converted into the insoluble copper salt by addition of cupric chloride. This latter is decomposed with sodium hydroxide, yielding the sodium salt, which may be further purified by dissolving in a little water, addition of alcohol, and subsequent evaporation after filtering off any insoluble material.2 The constitution to be assigned to sodium nitroprusside in particular, and hence to nitro-prussides in general, has been a subject of debate, Browning s3 formula is —... 

Substitution of potassium ferricyanide for 1% of sulfur dioxide dissolved in calcium-base spent sulfite liquor was possible at a pH of about 2.0. An increase in pH stabilized the cross-linking mixture unless 4% of ammonium chloride (dry wood basis) was added. In this case particle board could be produced at a pH of 4.5, with properties equivalent to those produced at a pH of 2.0, i.e., with IB values of up to 82.0 psi and acceptable water resistance (JOS, 109). 

Calcium hexacyanoferrate is usually converted into either the sodium and potassium salts, or into the hexacyanoferrates (III) (otherwise known as ferricyanides, [Fe(CN)6] ). It is used in the production of blue pigments and salt (as an anti-caking agent). 

Sodium diisobutyl dithiophosphate Sodium diisopropyl dithiophosphate Sodium di-(methylamyl) dithiophosphate Stearyl hydroxyethyl imidazoline flotation collector, zinc sulfide ore Sodium di-s-butyl dithiophosphate flotation depressant Acacia Calcium ferrocyanide Carboxymethylcellulose sodium Hydrofluoric acid Potassium ferricyanide Potassium ferrocyanide Sodium metabisulfite flotation depressant, copper ores Dicyandiamide Guanidine nitrate 2-Mercaptoethanol Phosphorus pentasulfide Quinolinic acid... 

Calcium carbide Calcium cyanamide Di-iron phosphide Magnesium iron oxide removal Citric acid iron processing Bismuth iron refining Calcium cyanamide iron removal Aluminum sulfate iron source Sodium ferric EDTA iron source, food Ferrous fumarate iron source, infant formulas Ferrous fumarate iron source, nutritional food Ferric pyrophosphate iron source, nutritional infant formulas Ferric pyrophosphate iron source, nutritional pharmaceuticals Ferric pyrophosphate iron source, pharmaceuticals Ferrous fumarate iron source, special dietary food Ferric choline citrate iron, tempering Potassium ferricyanide iron/manganese removal, water treatment Calcium hydroxide iron/steel casting Tellurium... 

Potassium Ferricyanide Potassium Hexacyanoferrate (III) Lead Sulfamate Calcium Bisulfite... 

Eastman 910 Potassium Ferricyanide Potassium Hexacyanoferrate (III) Calcium Bisulfite Calcium Nitrite Ammonium Fluoroborate Limonene Aluminum Acetate Potassium Ferrocyanide 2-Aminobutane sec-Butylamine Benzyl Acetate Phenylmethylacetate Ferrous Nitrate Iron (II) Nitrate... 

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