摘要
为研究我国进口再生铜冶炼烟气中二噁英(PCDD/Fs)的生成特性,文章采用管式炉模拟进口再生铜冶炼过程,分别分析了再生铜原料、冶炼温度和夹杂物含量对冶炼烟气中PCDD/Fs浓度、同系物浓度分布、毒性当量浓度分布等产生的影响。结果表明,各原料生成的PCDD/Fs浓度为高含量涂层漆包线(345.02 ng·g^(−1))远大于低含量涂层漆包线(40.18 ng·g^(−1))、铜加工材(8.13 ng·g^(−1))和铜米(2.49 ng·g^(−1)),原料预处理可有效减少PCDD/Fs的产生;不同再生铜原料生成PCDD/Fs同系物的分布具有相似性;六氯代二苯并呋喃(HxCDF)和五氯代二苯并呋喃(PeCDF)为二噁英毒性的主要贡献者。当温度从900℃升至1100℃时,PCDD/Fs浓度和毒性当量(TEQ)分别减少了59.83%和69.88%;升至1300℃时,PCDD/Fs浓度和毒性当量减少了11.59%和1.21%,1100℃以上高温可有效降低PCDD/Fs浓度和毒性当量;各实验温度下多氯二苯并二噁英类(PCDDs)的生成浓度均在0.29 ng·g^(−1)以下。随着夹杂物比例从0增加到1%,铜加工材冶炼烟气中PCDD/Fs的浓度和毒性当量浓度分别增加了1.15倍和2.4倍;PCDD/Fs同系物主要以八氯代二苯并呋喃(OCDF)与七氯代二苯并呋喃(HpCDF)为主,其浓度之和占比在86.01%以上。本研究为实际再生铜冶炼烟气中二噁英的减排提供理论依据和数据支撑。
To further investigate the generation characteristics of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)in the smelting exhaust gas generated from the import secondary copper in China,in this paper,a tubular furnace was used to simulate the smelting proess of imported secondary copper.The effect of raw materials of secondary copper,smelting temperature,and inclusion contention the concentation of PCDD/Fs,homologous concentration distribution and the concentration distribution of toxicity equivalency quantity(TEQ)in smelting flue gas were analyzed,respectively.The results showed that the concentration of PCDD/Fs in the smelting flue gas of secondary copper from different raw materials was as follows:high content coated enamelled wire(337.22 ng·g^(−1))>low content coated enamelled wire(40.18 ng·g^(−1))>copper processing material(8.13 ng·g^(−1))>copper rice(2.49 ng·g^(−1)).The pretreatment of the raw material of secondary copper can effectively reduced the generation of PCDD/Fs.The distribution of PCDD/Fs homologues produced by secondary copper regeneration with different raw materials is similar.The hexachlorodibenzofuran(HxCDF)and pentachlorodiphenyl Parafuran(PeCDF)were the major contributions to dioxin toxicity.With the temperature increased from 900℃ to 1100℃,PCDD/Fs concentration and the TEQ significantly decreased by 59.83%and 69.88%,respectively.At 1300℃,PCDD/Fs concentration and the TEQ decreased by 11.59%and 1.21%,respectively.High temperature above 1100℃ could effectively reduce PCDD/Fs concentration and the TEQ.The concentration of the PCDDs was lower than 0.29 ng·g^(−1) at all experimental temperatures.With the inclusion ratio increasing from 0 to 1%,the concentration of PCDD/Fs and the TEQ in the smelting flue gas of copper processing materials increased by 1.15 times and 2.4 times,respectively.The octachlorodibenzofuran(OCDF)and heptachlorodibenzofuran(HpCDF)were the main PCDD/Fs homologues,and the total accounts of those homologues was higher than 86.01%.This systematic study provides theoretical basis and data support for the emission reduction of dioxins in the flue gas of the actual secondary copper smelting.
作者
孟聪
岳波
孟棒棒
高红
吴海霞
周凯
贺自帅
MENG Cong;YUE Bo;MENG Bangbang;GAO Hong;WU Haixia;ZHOU Kai;HE Zishuai(Faculty of Civil Engineering and Architectural,Kunming University of Science and Technology,Kunming,650500,China;Research Institute of Solid Waste Management,Chinese Research Academy of Environmental Sciences,Beijing,100012,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第8期2462-2472,共11页
Environmental Chemistry
基金
国家重点研发计划课题(2019YFC1904802,2017YFC0703206)资助.
关键词
进口再生铜
模拟研究
二噁英
温度
夹杂物
imported secondary copper
simulation research
PCDD
Fs
temperature
inclusion
