State and leaching characteristics of Cr and As in the solid phase products of ultra-low emission coal-fired units
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摘要: 针对燃煤电厂超低排放机组，研究了固相产物中的铬和砷两种痕量元素的含量及其赋存和浸出特性。结果表明，超低排放机组飞灰中铬和砷含量均高于底渣。对于飞灰，1#、2#、3#机组铬和砷占比最大的形态分别为可交换态和可氧化态，而4#机组铬和砷占比最大的形态均为残渣态。砷的浸出量低于地下水环境标准(GB 14848—2017)中规定的0.01 mg/L，而2#和3#机组飞灰中铬的浸出量高于排放限值，应予以高度关注。Abstract: The content and state and leaching characteristics of the two trace elements, viz., chromium (Cr) and arsenic (As), in the solid product of ultra-low emission units in the coal-fired power plants are investigated. The results show that the contents of chromium and arsenic in the fly ash are in general higher than those in the bottom slag. In the fly ash samples of units 1#, 2#, and 3#, the most abundant chromium and arsenic species appear in the exchangeable state and oxidizable state, respectively, whereas in the ash sample of unit 4#, the residues account for the most chromium and arsenic species. The leaching concentration of arsenic is lower than 0.01 mg/L as specified in the groundwater environmental standard (GB 14848—2017); however, the leaching concentration of chromium in the fly ash of 2# and 3# units is higher than the emission limit, to which close attention should be paid.
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Key words:
- ultra-low emission /
- chromium /
- arsenic /
- content /
- speciation /
- leaching characteristics
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图 6 Cr在底渣中各化学结合态的对比
Figure 6 Comparison of chemical binding states of Cr in bottom slag
图 7 As在底渣中各化学结合态的对比
Figure 7 Comparison of the chemical binding states of As in bottom slag
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