| 电镀污泥中铬的无害化处理及动力学分析 |
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| 引用本文： | 余训民,黄雯琦,庄 田.电镀污泥中铬的无害化处理及动力学分析[J].武汉工程大学学报,2014,0(2):31-37. |
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| 作者姓名： | 余训民 黄雯琦 庄 田 |
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| 作者单位： | 武汉工程大学环境与城市建设学院，湖北 武汉 430074 |
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| 摘 要： | 以某表面处理工业园电镀废水处理污泥为研究对象，以铬浸出率为指标,通过对重金属的浸出，分步回收达到无害化、资源化的目的.将污泥干燥、研磨，在不同浓度硫酸溶液中浸出，控制浸出时间、浸出温度和搅拌速率；浸出完成后抽滤使浸出液与残渣分离.采用正交试验法，确定对铬浸出效果影响因素的顺序为:硫酸浓度>搅拌速度>浸出时间>固液比.通过单因素优化试验，结果显示:当浸出温度为25 ℃、固液比为1∶15、浸出时间为20 min、搅拌速率为800 r/min、硫酸体积分数为30%时，铬的浸出率最高.最后用黄钠铁矾法除铁，用焦亚硫酸钠还原六价铬，用氢氧化钠分步沉淀铬、镍重金属，锌则继续留在溶液中.电镀污泥的浸铬实验的浸出动力学研究结果表明硫酸作为浸出剂的反应级数为1，反应的速率常数为:k=0.053 2e-4.52/RT.
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| 关 键 词： | 含铬污泥 铬浸出 最佳浸出条件 反应级数 速率常数 |
Harmless treatment experiment and dynamic analysis of chromium eletroplating sludge |
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| Authors: | YU Xun-min HUANG Wen-qi ZHUANG Tian |
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| Affiliation: | School of Environment and Civil Engineering,Wuhan Institute of Technology,Wuhan 430074,China |
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| Abstract: | We studied the leaching rate of chromium from sludge of electroplating wastewater in a surface treatment industrial park through leaching and recycling heavy metals to achieve the harmless and recycling purpose.The sludge was dried,grinded and leached in sulfuric acid solution with different concentrations,and the leaching time and temperature and stirring speed were under strict control.Suction filtration was applied to separate the lixivium from residue after leaching.Orthogonal experiment demonstrates that the order of factors that impact the chromium leaching effect is sulfuric acid concentration ＞ stirring speed ＞ leaching time＞solid-to-liquid ratio.The results of single factor experiment show that the highest leaching rate of chromium is achieved when leaching temperature is 25 ℃,solid-to-liquid ratio is 1 ∶ 15,leaching time is 20 min,stirring speed is 800 r/min and volume fraction of sulfuric acid is 30％.Finally,sodium jarosite was applied to remove iron;sodium pyrosulfite was applied to reduce chromium Ⅵ and sodium hydroxide was applied to precipitate such heavy metal as chromium and nickel step by step,whereas zinc stayed in the solution.The study of leaching kinetics of chromium leaching from electroplating sludge reveals that the reaction order of sulfuric acid as a leaching agent is 1and its reaction speed constant is k=0.053 2e-4.52/RT. |
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| Keywords: | chromium sludge chromium leaching the optimum leaching conditions reaction rate constant |
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