| 中和沉淀渣的稳定化研究 |
| 摘要点击 791 全文点击 872 投稿时间：1991-03-05 |
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| 中文关键词 铁酸盐包复 重金属离子 中和沉淀渣 稳定化 |
| 英文关键词 ferrite coating heavy metal ions neutralization precipitation sludge |
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| 中文摘要 |
| 本研究用铁酸盐(FeSO4·7H2O)包复中和沉淀渣。实验证明,影响因素有加入的铁酸盐总量、反应温度、空气鼓泡速度、反应pH、氧化还原电位和加料次数。当加入铁酸盐总量减少时,包复效果变差;温度升高,对Mn包复不利;温度降低,使Cd、Cu和Zn的包复效果变坏;空气鼓泡速度变小,反应速度变慢;降低pH值,有利包复,但pH小于9时,不易控制;氧化还原电位对包复影响不明显;增加加料次数,有利包复。通过这种处理,在中和沉淀渣的小颗粒上形成完全的铁酸盐包复膜,在弱酸性条件下重金属离子不再浸出。 |
| 英文摘要 |
| The method of ferrite coating on neutralization precipitation sludge (NPS) was studied. Ferrite coating on NPS is influenced by various elements, such as total amount of FeSO4·7H2O adding reaction temperature, pH value, air velocity, oxidation-reduction potential and frequency of FeSO4·7H2O added. Lowre amount of FeSO4·7H2O added makes the results of coating worse. High reaction temperature is detrimental to the localization of Mn. However low reaction temperature is unfavourable for the coating of Cd, Cu and Zn. Low air velocity results in slow, reaction rate which is not beneficial to coating. The coating reaction would he difficult to control at pH lower than 9. ORP has little influence on coating for the experimental conditions. The higher the frequency of FeSO4·7H2O addition is, the better the results of coating would be. In this experiment, complete ferrite film was found to be formed on the surface of small NPS particles. Through this kind of disposal process, heavy metal ions will no longer leach out from NPS under weak acidic conditions. |
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