磁种絮凝-磁分离法处理含锌废水的研究 |
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引用本文: | 黄自力,陈治华,夏明辉.磁种絮凝-磁分离法处理含锌废水的研究[J].武汉冶金科技大学学报,2010(3):323-326. |
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作者姓名: | 黄自力 陈治华 夏明辉 |
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作者单位: | 武汉科技大学冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081 |
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基金项目: | 国家杰出青年科学基金资助项目(59925412); 湖北省教育厅科研资助项目(B200511004) |
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摘 要: | 采用磁种絮凝-磁分离方法对模拟某锌盐制造企业的排放废水进行处理,研究了废水pH值对其Zn^2+去除效果的影响、絮凝剂聚丙烯酰胺(PAM)和磁种(Fe3O4)对氢氧化锌沉淀物沉降性能的影响以及外加磁场对磁种-氢氧化锌絮凝体沉降性能的影响。结果表明,有利于Zn^2+沉淀的最佳废水pH值为9-12;PAM与磁种同时使用能改善Zn(OH)2的沉降性能;在外加磁场作用下,废水中的磁种-氢氧化锌絮凝体由于受到与重力方向一致的磁力,其沉降速度加快,污泥压缩得更快、更实,上清液中锌的质量浓度降至0.83 mg/L;磁性矾花絮凝体经硫酸溶液或氢氧化钠溶液浸泡后,过滤得到的磁种可循环使用,滤液中的锌可回收利用。
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关 键 词: | 含锌废水 化学沉淀 磁种絮凝 磁分离 |
Treatment of zinc-containing wastewater by magnetic seeding flocculation and magnetic separation |
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Authors: | Huang Zili Chen Zhihua Xia Minghui |
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Affiliation: | (Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan University of Science and Technology,Wuhan 430081,China) |
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Abstract: | The zinc-containing wastewater was treated by magnetic seeding flocculation and magnetic separation.First,the effect of pH value on the precipitation of Zn2+ ion and that of flocculatant(PAM) and magnetic seed(Fe3O4) on the settlement of Zn(OH)2 were investigated.Secondly,a contrasting test of the settlement of magnetic seed-Zn(OH)2 aggregation inside and outside a designed magnetic field was carried out.The results indicate that the pH value best for Zn2+ ion precipitation is from 9 to 12;the settlement properties of Zn(OH)2 can be improved by the combined use of PAM and Fe3O4;the magnetic seed-Zn(OH)2 aggregation sink faster and the sludge becomes more easily compressed because the magnetic force accords with the gravity.Under the external magnetic field,the sludge settlement ratio declines to 32% after 8-minute settlement and to 29% after 28-minute settlement,and the zinc content of the upper clear liquid is 0.83 mg/L.It is also demonstrated that the Fe3O4 and Zn can be separated completely and reused after the magnetic seed-Zn(OH)2 aggregation is soaked with sulfide acid or sodium hydroxide solution and filtered. |
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Keywords: | zinc containing wastewater chemical precipitation magnetic seeding flocculation magnetic separation |
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