PROCESS FOR TREATING AQUEOUS MEDIA CONTAINING METAL IONS

摘要

Process for treating aqueous media containing metal ions having valences of +2 and higher and optionally acid comprising: (a) contacting the aqueous media, at a pH of about 1-5, with an effective amount of product recycled from step (b) to dissolve at least some metal carbonates, produce at least some CO2, convert at least some metal ions having a valence of at least +3 to metal hydroxide precipitates, and neutralize some acid, if present; (b) contacting the product of step (a), at a pH of about 4-8.5, with an effective amount of Na2CO3 to convert at least some metal ions of +2 valence to metal carbonate precipitates and form at least some dissolved sodium salts; (c) recovering, from a portion of the product from step (b) that is not recycled, metal carbonates, metal hydroxides, and sodium salts.