Beryllium fluorides

As a consequence of the high ionisation energy of beryllium its halides are essentially covalent, with comparatively low m.p.. the melts being non-conducting and (except beryllium fluoride) dissolving in many organic solvents. [Pg.128]

Beryllium is found in some 30 mineral species, the most important of which are bertrandite, beryl, chrysoberyl, and phenacite. Aquamarine and emerald are precious forms of beryl. Beryl and bertrandite are the most important commercial sources of the element and its compounds. Most of the metal is now prepared by reducing beryllium fluoride with magnesium metal. Beryllium metal did not become readily available to industry until 1957. [Pg.11]

Magnesium Air, beryllium fluoride, ethylene oxide, halogens, halocarbons, HI, metal cyanides, metal oxides, metal oxosalts, methanol, oxidants, peroxides, sulfur, tellurium... [Pg.1209]

Reduction of Beryllium Fluoride with Magnesium. The Schwen2feier process (11) is used to prepare a purified, anhydrous beryUium fluoride [7787-49-7], Bep2, for reduction to the metal. BeryUium hydroxide is dissolved in ammonium bifluoride solution to give a concentration of 20 g/L... [Pg.67]

Beryllium fluoride is hygroscopic and highly soluble in water, although its dissolution rate is slow. FluoroberyUates can be readily prepared by crystallization or precipitation from aqueous solution. Compounds containing the BeP ion are the most readily obtained, though compounds containing other fluoroberyUate ions can also be obtained, eg, NH BeF, depending upon conditions. [Pg.75]

Combeau, C. Carlier, M.-F. (1989). Characterization of the aluminium and beryllium fluoride species bound to F-actin and microtubules at the site of the y-phosphate of the nucleotide. J. Biol. Chem. 264,19017-19022. [Pg.56]

Phan, B. Reisler, E. (1992). Inhibition of myosin ATPase by beryllium fluoride. Biochemistry 31, 4787-4792. [Pg.57]

The complex fluoride process consists of roasting beryl with Na2[SiF ] (or NajfFeFg]) at 700-750°C and leaching the product with water to extract the soluble beryllium fluorides. A flow diagram summarizing this process is given in Scheme 2. [Pg.362]

Sodium beryllium fluoride (Na2BeF4) is water-soluble and sodium aluminum fluoride (Na,AlF6) is water-insoluble. A part of the silicon volatilizes off as silicon tetrafluoride (SiF4), while the other part remains in the residue as silicon dioxide (Si02). Fluorination of silicon is unnecessary and it would be economical to recover all of it as silica. This is accomplished by using soda ash, i.e., sodium carbonate (Na2C03) in the reaction mixture ... [Pg.415]

Fluorides are nonhygroscopic, and their melting points are higher than those of the corresponding chlorides. Besides, the fluoride reduction reactions are considerably more exothermic. The prime examples of the use of fluorides as intermediates are the reduction of uranium tetrafluoride by calcium or magnesium the reduction of rare earth fluorides by calcium, reduction of beryllium fluoride by magnesium and the reduction of potassium tantalum double fluoride by sodium. [Pg.421]

The reduction of beryllium fluoride by magnesium according to the reaction... [Pg.423]

See Magnesium Beryllium fluoride See other METAL halides... [Pg.98]

Copaux A method for extracting beryllium from beryl. The ore is heated with sodium flu-orosilicate at 850°C. Leaching with water dissolves the beryllium fluoride, leaving the silica and most of the aluminum fluoride as an insoluble residue. Addition of sodium hydroxide precipitates beryllium as the hydroxide. The process was invented by H. Copaux and has been in use in France since 1915 and in the United Kingdom since World War II. [Pg.71]

Kjellgren A process for making beryllium by reducing beryllium fluoride with magnesium. Invented in 1941 by B. R. F. Kjellgren at the Brush Beryllium Company, OH, and now the principle commercial method for making beryllium metal. [Pg.154]

Schwenzfeier-Pomelee A process for purifying beryllium and producing glassy beryllium fluoride. Beryllium hydroxide is dissolved in aqueous ammonium hydrogen fluoride various metal impurities are removed by successive precipitations, and ammonium fluoroberyllate is crystallized under vacuum. When this is heated, ammonium fluoride vaporizes and molten beryllium fluoride remains. [Pg.237]

Some of the few complete sets of enthalpies for binary fluorides are collected in Tables XVIII and XIX. The inversion in dissociation heats for copper and beryllium fluorides can be associated with the closed-shell configurations of Be2+ and Cu+. The alternations in bond energies... [Pg.47]

Antimony trichloride oxide, 4150 Beryllium chloride, 0221 Beryllium fluoride, 0223... [Pg.235]

BERYLLIUM BOROHYDRIDE BERYLLIUM BROMIDE BERYLLIUM CHLORIDE BERYLLIUM FLUORIDE BERYLLIUM IODIDE BISMUTH... [Pg.203]

One method of obtaining beryUium metal is by chemical reduction, whereby beryllium oxide is treated with ammonium fluoride and some other heavy metals to remove impurities while yielding berylhum fluoride. This beryllium fluoride is then reduced at high temperatures using magnesium as a catalyst, which results in deposits of pebbles of metallic beryllium. [Pg.67]

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