Гидроксид бериллия

Description

Beryllium hydroxide is an amphoteric inorganic compound, an intermediate product in the processing of beryllium ores and the production of beryllium metal and its oxide. Chemical formula Be(OH)2, CAS number 13327-32-7, synonyms - beryllium dihydroxide, beryllium hydroxide (Be(OH)2), 1304-49-0.

Receiving technology

In the industrial sulfuric acid beryl processing scheme, the mineral is sintered, crushed and opened with sulfuric acid, transferring the beryllium into a sulfate solution. From the purified solution, beryllium hydroxide is precipitated by controlled alkalization, adjusting the pH so that the accompanying aluminum and iron remain in solution or, on the contrary, precipitate before beryllium - depending on the specific technological scheme. The resulting precipitate is filtered, washed from residual sulfates and sent either for calcination to beryllium oxide, or for dissolution in the target acid to obtain the corresponding salt.

Basic Attributes

• Chemical formula: BeH2O2 (Be(OH)2)
• Molecular weight: 43.03
• Exact weight: 43.01770
• EU number: 236-368-6
• UNII: 2X0LRF1T6Q
• Specifications PSA: 40.46000
• XLogP3: -0.35360

Physico-chemical characteristics

• Density: 1.92 g/cm3
• Melting point: 105°C (with decomposition)
• Boiling point: 100 °C at 760 mmHg. Art.
• Toxicity: intravenous, rats, LDLo 3.821 mg/kg
• Flammability characteristics: non-flammable substance; upon thermal decomposition, releases toxic fumes of beryllium oxide

Scope of application

Beryllium hydroxide is an intermediate compound in the hydrometallurgical processing of beryl and bertrandite: it is obtained by precipitation from sulfuric acid or fluoride solutions of beryllium concentrate, and then calcined to beryllium oxide or converted into beryllium salts for the further production of alloys, ceramics and beryllium metal. The amphoteric nature of the hydroxide - it dissolves both in acids and in excess alkalis - is used at the stage of purifying beryllium from accompanying impurities of aluminum and iron.

Safety Information

• Packing level: II
• Hazard category: 6.1(a)
• Transport codes: UN 1566

Storage and transportation conditions

The storage must be ventilated, maintain low temperature and dryness; the substance is stored separately from alkalis, acids and food additives. When heated, it decomposes, releasing toxic fumes of beryllium oxide, so working with the product requires respiratory protection and ventilation of the work area, as with other beryllium compounds classified as hazard class 6.1 for transportation under UN number 1566.

Regular production control includes determining the residual content of aluminum and iron in the finished beryllium hydroxide, since it is these impurities that limit the quality of the subsequent oxide and metal. This control directly affects the electrical properties of the final ceramic.