SORBENT, METHOD FOR PREPARATION THEREOF, AND A METHOD FOR SEPARATELY RECOVERING METAL SALTS FROM WASTES Russian patent published in 2005 - IPC

FIELD: sorption technologies.

SUBSTANCE: invention aims at preparing carbon sorbent for recovering valuables components from various production wastes. Proposed sorbent has summary water-accessible pore volume 0.2-0.3 cm³/g, specific surface 60.0-80.0 m²/g, iodine sorption activity 35.0-45.0%, benzene sorption activity 3000.0-330.0 mg/g, ash residue 45.0-47.9%, and loosed density 0.28-0.30 kg/dm³. Preparation of sorbent comprises treating peat with potassium hydroxide, separating solid and liquid phases, treating the latter with acid reagent to lower pH to 4.0-6.0 thereby obtaining gel-like precipitate and supernatant, multistage treatment of supernatant with acid reagent to lower pH to 2.0-2.5 and thereby to separate gel-like precipitates and supernatants in each stage, heat treatment of gel-like precipitates, mixing them with each other and with solid phase, carbonization of resulting product, granulation and mixing of granules with previously obtained gel-like precipitate with pH 2.0-2.5 and subsequent aeration at elevated temperature. In the proposed method of recovering metal salts from wastes, waste is ground and leached with solution containing fulvene acids followed by sorbent-assisted chromatographic fractionation and recovery of corresponding metal salts. After separation of solid and liquid phases, the latter is passed through sorbent, which is further regenerated with sulfuric acid solution. Solid phase is fractioned via multistage treatment with fulvene acids-containing eluent solution, while raising pH of solution in each stage. Eluates from each stage are separately brought into contact with sorbent, which is further regenerated with sulfuric acid solution.

EFFECT: facilitated recovery of valuable waste components.

7 cl, 2 tbl, 3 ex