Nitrofluor法による緑柱石のベリリウムの回収に関する研究

抄録

A study was conduced to the recovery of beryllium from beryl by the nitrofluor process. A complete disintegration of the beryl was achieved within ten hours in a nonaqueous solvent consisting of 80 mole % HF-20 mole % NO₂ at 80°C. During the decomposition, complex metallic fluorides were produced, and all of beryllium dissolved in the solvent while aluminum precipitated leaving a few percent in the solution.
For further isolation of the complex fluorides, the beryllium bearing compound was heated up to 400°C, redissolved in the solvent and then dried again. Subsequently, most of aluminum and silicon were eliminated from the beryllium fluoride due to a poor solubility of AlF, formed during the heating and a sublimation of (NO) ₂SiF₆ respectively.