| 摘要 |
A method for preparing a chlorine-removal alkali residue mixture by utilizing alkali residues through an ammonia-soda process. The method comprises the following steps: step 1, crushing returned sand and returned stones, and grinding to obtain returned sand and returned stone powder; step 2, soaking the returned sand and returned stone powder in water for 0.5-14 days, digesting the burnt calcium oxide, then mixing the digested returned sand and returned stone powder, alkali residues and water, wherein the ratio of dry mass of the digested returned sand and returned stone powder to the alkali residues is 2:8 to 5:5 based on the mass percentage of the materials, and the total mass of the water is 1.5 to 8 times as much as the total dry mass of the digested returned sand and returned stone powder and alkali residues; or mixing the returned sand and returned stone powder, the alkali residues and water, then soaking the mixture for 0.5-14 days, and digesting the burnt calcium oxide; step 3, performing filter-pressing treatment, then obtaining the chlorine-removal alkali residue mixture of which the chloride ion content is lower than 0.30 percent of the total mass of solids in the mixture. An application of the chlorine-removal alkali residue mixture. The method is good in chlorine removal effect, simple in process, energy-efficient and environmentally-friendly. |
