| 摘要 |
FIELD: sorbents. ^ SUBSTANCE: invention concerns modified sorbents applicable in food-processing and chemical industries. Modified sorbent is prepared from aluminum-containing raw material, namely from aluminum band etching waste in manufacture of aluminum structures. Fifty gram of raw material is treated for 3-5 h at 70°C with 3-7% sodium hydroxide solution in amounts 100. 125 or 150 cc. Resulting precipitate is filtered and sent to re-treatment with sodium hydroxide and sodium aluminate containing filtrate is mixed with 1-2 M sulfuric acid solution so that pH reaches 6.4-7.4. Aluminum hydroxide precipitate obtained is filtered and rinsed with water to remove sodium ions, heated in drying box to 200°C at heating rate 10-20°C/h, and calcined in muffle kin for 5 h to 450°C at heating rate 50°C/h to give pulverulent aluminum oxide. The latter is treated for 10-12 min with aqueous solution of surfactant OP-10 with concentration 0.019-0.022% at 39-41°C and aluminum oxide-to-surfactant ratio 1:10, after which dried at room temperature. ^ EFFECT: increased adsorption capacity, reduced production cost, and utilized production waste. ^ 1 tbl, 5 ex |
