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吸附完废水的高炉水淬废渣含有大量的重金属,其中Cd2+超过国家固体废弃物排放最高允许值,属于危险废物。因此,为有效控制高炉水淬废渣中重金属污染,采用不同废渣取代率设计不同配合比的炉渣混凝土,研究取代率对炉渣混凝土工作性能的影响,同时采用美国EPA毒性浸出实验(TCLP)和固化体表面浸出实验对高炉水淬废渣混凝土固化体的浸出毒性进行安全性评定。结果表明,掺加高炉水淬废渣可以使炉渣混凝土流动性变大,后期抗压强度增长显著,完全达到了C30混凝土的要求。高炉水淬废渣混凝土固化体最大浸出毒性满足国家固体废弃物排放标准。此外,固化体早期表面浸出率为10-3数量级,后期表面浸出率仅为10-6数量级,可见固化体的长期抗浸出能力是很强的,废渣中的重金属离子得到有效的束缚和稳定固化,既解决了环境问题,又为高炉水淬渣产业化发展开辟了新的途径。
Absorption of waste water blast furnace water quenching slag contains a lot of heavy metals, of which Cd2 + exceeds the maximum allowable value of national solid waste emissions, are hazardous waste. Therefore, in order to effectively control the heavy metal pollution in blast furnace water quenching slag, different slag replacement rates were used to design different mixed slag concrete to study the effect of substitution rate on the workability of slag concrete. At the same time, the toxicity of TCLP and curing agent Surface leaching experiments on blast furnace water quenching slag solidified concrete leaching toxicity safety assessment. The results show that the slag mixture with blast furnace water quenching can make the fluidity of slag concrete larger and the compressive strength increase significantly at the later stage, which fully meets the requirements of C30 concrete. The maximum leaching toxicity of blast furnace water quenched slag concrete solidified body meets the national solid waste discharge standards. In addition, the early surface solidification rate of 10-3 orders of magnitude, the late surface leaching rate of only 10-6 orders of magnitude, showing solidified long-term anti-leaching ability is very strong, heavy metal ions in the waste residue is effectively binding and stable curing , Not only solved the environmental problems, but also opened up a new way for the blast furnace water quench slag industrialization.