| 彩色显象管发光粉生产废水处理工艺研究 |
| 摘要点击 645 全文点击 662 投稿时间：1996-02-25 |
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| 中文关键词 溶剂萃取 锌 发光粉 P204 |
| 英文关键词 solvent extraction zinc D2EHPA di-(2-ethyl-hexyl)-phosphoric acid luminous powder(ZnS) |
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| 中文摘要 |
| 为了消除彩色显象管发光粉生产废水中重金属对环境的污染和实现资源回用,用P204(皂化)-煤油-硫酸体系分离回收废水中的锌.研究结果表明,以皂化P204为萃取剂,经三级逆流萃取,Zn2+的萃取率可达99%,共存的Ni2+几乎不被萃取,Cu2+的萃取率小于7%;用硫酸溶液对负锌萃取剂进行二级逆流反萃取,反萃取率达96%以上,反萃浓缩液可返回生产过程使用;萃余液用石灰中和沉淀处理后,金属离子的浓度可以达到国家的综合排放标准。 |
| 英文摘要 |
| A solvent extraction process for zinc recovery from wastewater from luminous powder (ZnS) manufacturing process was studied. The optimum operation parameters of each unit were determined in laboratory. The zinc ion (Ⅱ) in wastewater was extracted by D2EHPA (di-(2-ethyl-hexyl)-phosphoric acid) in the state of saponification-kerosene solution and extracted back by sulfuric acid solution. The zinc recovery rate was more than 95%, nickel in wastewater was not extracted and extraction rate of copper in wastewater was less than 7%. The concentrated zinc solution could be reused in luminous powder (ZnS) manufacturing process. Concentration of zinc, copper and nickel in effluent, after treated by using lime, are lower than the National Wastewater Discharge Standards. |
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