| 摘要 |
<p>A thallium and potassium nitrate recovery method, and a recovery apparatus therefor, which comprises a thallium recovery step, in which thallium-containing potassium nitrate is dissolved in water to produce an aqueous solution, dissolved thallium in this aqueous solution is caused to precipitate as metallic thallium or thallium oxide by passing a direct current through this aqueous solution, and then this metallic thallium or thallium oxide is recovered, and a potassium nitrate recovery step, in which dissolved potassium nitrate in this aqueous solution from which the thallium has been removed is caused to precipitate as crystals by concentrating said aqueous solution, and then this potassium nitrate crystal is recovered. With the present invention, the thallium contained in thallium-containing potassium nitrate can be recovered and effectively utilized, and potassium nitrate can also be recovered and effectively utilized.</p> |
