Beryllium carbonate

Beryllium Carbonates. BeryUium carbonate tetrahydrate [60883-64-9] BeCO 4H2O, has been prepared by passing carbon dioxide through an aqueous suspension of beryUium hydroxide. It is unstable and is obtained only when the solution is under carbon dioxide pressure. BeryUium oxide carbonate [66104-25-4] is precipitated when sodium carbonate is added to a beryUium salt solution. Carbon dioxide is evolved. The precipitate appears to be a mixture of beryUium hydroxide and the normal carbonate, BeCO, and usuaUy contains two to five molecules of Be(OH)2 for each BeCO. ... 

Computations were carried out for nine chemicals beryllium, carbon tetrachloride, chloroform, dioxin, epichlorohydrin, ethylene oxide, formaldehyde, manganese, and trichloroethylene. 

Synonyms/compounds Glucinium beryllium oxide beryllium chloride beryllium fluoride beryllium hydroxide beryllium phosphate beryllium nitrate beryllium sulfate beryllium carbonate... 

Beryllium acetate, basic see Beryllium and beryllium compounds) Beryllium-aluminium alloy see Beryllium and beryllium compounds) Beryllium carbonate see Beryllium and beryllium compounds) Beryllium chloride see Beryllium and beryllium compounds) Beryllium-copper alloy see Beryllium and beryllium compounds) Beryllium-copper-cobalt alloy see Beryllium and beryllium compounds) Beryllium fluoride see Beryllium and beryllium compounds)... 

The loaded oiganic phase is stripped of beryllium using an aqueous ammonium carbonate [506-87-6] solution, apparently as a highly soluble ammonium beryllium carbonate [65997-36-6] complex, (NH Be O. All of the iron [7439-89-6] contained in the leach solution is coextracted with the beryllium. Heating the strip solution to about 70°C separates the iron and a small amount of coextracted aluminum as hydroxide or basic carbonate... 

Heating the ammonium beryllium carbonate solution to 95°C causes nearly quantitative precipitation of beryllium basic carbonate [66104-24-3], Be(OH)2 2BeC03. Evolved carbon dioxide and ammonia are recovered for recycle as the strip solution. Continued heating of the beryllium basic carbonate slurry to 165°C liberates the remaining carbon dioxide and the resulting beryllium hydroxide [13327-32-7] intermediate is recovered by filtration. The hydroxide is the basic raw material for processing into beryllium metal, copper—beryllium and other alloys, and beryllia [1304-56-9] for ceramic products. Approximately 90% of the beryllium content of bertrandite is recovered by this process. 

Eight grams of basic beryllium carbonate (of analysed beryllium content) are stirred with 16ml of glacial acetic acid on a hot plate or steam bath until carbon dioxide is no longer evolved. The solution is cooled and the product is filtered off by suction and air-dried. The crude material is stirred with 20ml of dry chloroform and insoluble impurities are removed by filtration. The chloroform solution is evaporated to dryness on the steam bath and the colorless crystals of the product (m.p. 285-286°C) are dried in vacuo to remove residual solvent. 

Ammonium beryllium carbonate solutions are prepared by dissolving the hydroxide or the basic carbonate in warm (50°C) aqueous mixtures of NH4HCO3 and (NH4) C03. After filtering to remove insoluble impurity hydroxides and adding a chelating agent, heating above 88°C evolves... 

NHj and CO2 and precipitates a high-purity, basic beryllium carbonate. If the aqueous system has the stoichiometry of (NtL Be COi) , analogous to the ammonium nranyl carbonate system, the basic beryllium carbonate product of hydrolysis is 2BeCC>3 Be(OH)2- This compound is readily dissolved in all mineral acids, making it a valuable starting material for laboratory synthesis of beryllium salts of high purity. 

Fig. 4. Computer-generated crystal structure models nop row. left to right) Cuprite, zinc-blende, rutile, perovskite. iridymite (second row) Cristobalite. potassium dihydrogen phosphate, diamond, pyrites, arsenic (third rowt Cesium chloride, sodium chloride, wurtzite. copper, niccolite (fourth row) Spinel, graphite, beryllium, carbon dioxide, alpha i uanz. [AT T Bel Laboratories ...

Beryllium butyrate, basic, properties and structure of, 3 7, 8 Beryllium carbonate, basic, for use in preparation of basic beryllium acetate, 3 10 Beryllium chloride, anhydrous, 6 22 Beryllium o-chlorobenzoate, basic, properties of, 3 7 Beryllium complex compounds, basic, of organic acids, 3 4 basic, structure of, 3 6 nonelectrolytes, with acetylace-tone, Be(CsH702)2, 2 17 with benzoylacetone, Be(Cio-H 02)2, 2 19... 

Be(C6H903)2 Beryllium derivative of ethyl acetoacetate, 2 19 Be (Ci oHa02) 2 Beryllium derivative of benzoylacetone, 2 19 Be(Ci5Hu02)2 Beryllium derivative of dibenzoylm ethane, 2 19 (BeO)a,-(BeCOs) Beryllium carbonate, 3 10... 

Ammonium carbonate solution white precipitate of basic beryllium carbonate, soluble in excess of the reagent (difference from aluminium). On boiling the solution, the white basic carbonate is reprecipitated. 

A precipitate that separates here may be (basic) beryllium carbonate. It should be filtered off and tested for Be by the basic acetate-chloroform test or by the acetylacetone test (see Section VII.16, reactions 6 and 9). 

In the data bank ADAS (Atomic Data Analysis Structure) [23,24] one can find ti/XB-values for some important elements and lines, e.g., hydrogen, helium, beryllium, carbon, nitrogen, oxygen, neon, chromium, and molybdenum. However, there is still a lack of values for significant impurities with a number of their ionization states, e.g., neutral neon, silicon, tungsten, etc. (see below). A more elaborate version of the graph shown in [16] is provided in Fig. 6.3, which already contains improved numbers for Crl, Mol and Da for different densities. 

The simple trifluoroacetates of all the alkaline earth elements have been reported (36,105, 247, 263). Compound Be(02CCF3)2 was obtained in a study of several beryllium haloacetates and, although a deliberate attempt was made to prepare basic beryllium trifluoroacetate, Be40(02CCF3)g, by the thermal decomposition of the simple salt, none could be obtained (268). Also Be40(02CCF3)e does not appear to be produced when beryllium carbonate is treated with trifluoroacetic acid and the solution extracted with chloroform (122, 174). 

The extraction of Be from its ore is attended by exposure to acid salts of the metal, particularly the fluoride (Bep2), the ammonium fluoride and sulfate (BeS04), and also to ber rllium oxide (BeO), and hydroxide [Be(OH)2], Exposure to the oxide also occurs in the casting of beryllium alloys and in operations with beryUia ceramics. In the manufacture of fluorescent powders, lamps, and sign tubes, there may be exposure to beryllium carbonate and to more complex salts, such as ZnMnBe silicate. Exposure to beryllium compounds encountered in the extraction of the metal... 

Write the formulas for the following salts, by referring to Table 10-1 show the charges on the metal ion and on the complex anions sodium sulfate calcium silicate barium perchlorate beryllium carbonate aluminum nitrate aluminum sulfate aluminum phosphate potassium chlorate potassium sulfite. 

Additional biological hazard in the handling of plutonium recovered from irradiated uranium or of uranium from irradiated thorium arises from fast neutrons produced by (o, n) reaction. Alpha particles from actinide decay react with light elements—lithium, beryllium, carbon, oxygen, etc.—to produce energetic neutrons such as... 

Reactivity Degree zero (0) consists of materials which are stable under fire conditions and do not react with water. Arsenic trisulfide, beryllium, carbon tetrachloride emd hydrogen sulfide are in degree zero (0). 

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