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首页> 外文会议>The 23rd International Conference on Solid Waste Technology and Management(ICSW 2008) >Using Supercritical Fluid Extraction to Remove Heavy Metals from EAF Dust in Steelmaking Industry
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Using Supercritical Fluid Extraction to Remove Heavy Metals from EAF Dust in Steelmaking Industry

机译：在炼钢行业中使用超临界流体萃取去除电炉粉尘中的重金属

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The components of electric arc furnaces (EAF) dust, produced from steelmaking industry, include inorganic pollutant such as heavy metals which usually lead EAF dust classified as industrial hazardous waste. The objective of this research was to use chelating agent solutions to wash specific heavy metals which will interfere with the recovery of zinc oxide. In addition, the efficiency of supercritical fluid (CO_2) extraction to remove specific heavy metals from EAF dust was evaluated. In order to enhance the removal efficiency of heavy metals, three chelating agent solutions were introduced to the supercritical fluid extraction system. Also, hydrogen peroxide was added in order to increase the oxidation reduction potential in EAF dust and to enhance the solubility of heavy metal in chelating agents or supercritical fluid, which consequently increased the removal efficiency of specific heavy metals from EAF dust. Three EAF dusts, with alkaline, neutral and acidic in terms of pH value, were selected as subjects in this study. In the study of batch washing by chelating agents, the results showed the method of using EDTA chelating agent pretreated by adding 0.14% H_2O_2 was the optimal condition. However, the results of supercritical fluid extraction suggested that the optimal operation condition for alkaline and neutral EAF dusts was to use EDTA chelating agent with pretreatment of 0.14% H_2O_2 which extraction efficiency of heavy metals was more than 40% in one batch extraction, the data also indicated the extraction efficiency was increased about 10～20% when chelating agents were introduced in. However, the chelating agents and H_2O_2 pretreatment did not enhance the extraction efficiency for condition of acidic dust.
机译：炼钢行业生产的电弧炉粉尘（EAF）的成分包括无机污染物，例如重金属，通常会导致将EAF粉尘归类为工业危险废物。这项研究的目的是使用螯合剂溶液洗涤会干扰氧化锌回收的特定重金属。此外，评估了超临界流体（CO_2）萃取从电炉粉尘中去除特定重金属的效率。为了提高重金属的去除效率，将三种螯合剂溶液引入超临界流体萃取系统。另外，添加过氧化氢以增加EAF粉尘中的氧化还原电位并增强重金属在螯合剂或超临界流体中的溶解度，因此提高了从EAF粉尘中去除特定重金属的效率。在本研究中，选择了三种pH值为碱性，中性和酸性的EAF粉尘。在螯合剂分批洗涤的研究中，结果表明，采用添加0.14％H_2O_2预处理的EDTA螯合剂的方法是最佳条件。然而，超临界流体萃取的结果表明，碱性和中性电弧炉粉尘的最佳操作条件是使用EDTA螯合剂进行0.14％H_2O_2的预处理，重金属的萃取效率在一次萃取中超过40％。还表明引入螯合剂后，萃取效率提高了约10〜20％。但是，螯合剂和H_2O_2的预处理并未提高酸性粉尘的萃取效率。

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