| 摘要 |
<p>A method is disclosed to recover compounds from red mud comprising adding red mut (5) to a digester (10) containing an acid and heating the mixture to dissolve compounds of iron, aluminun, silicon and titanium to provide a digest containing dissolved salts of the compounds. The digest is treated with water (20) to dissolve soluble salts therein and provide a slurry of water, dissolved salts and silica. The silica is separated (30) from the liquid and the pH of the liquid is adjusted (80) to form an aluminate and an iron-containing precipitate. The precipitate is separated (90) from the liquid whose pH is adjusted (110) to precipitate aluminum trihydrate which is separated (120). The pH of the aluminum trihydrate-depleted liquid is adjusted (140) to form a precipitate of at least one remaining salt. The salt precipitate is separated (150) from the salt-depleted liquid.</p> |
