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Toxicity Identification of Ancient Smelting Slag
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Toxicity Identification of Ancient Smelting Slag
By taking the ancient smelted residue in Fengdu County Chongqing as research object, the waste residue's corrosion and leaching toxicity is analyzed and leaching ability of heavy metal in waste residue is analyzed through leaching toxicity test under different pH value conditions. The test results show that the waste residue is alkaline; the residual quantity of heavy metal is high; and the average content of heavy metal (zinc and plumbum) is up to 6.97%. However, heavy metal of waste residue is based mainly on residual state. Its leaching toxicity is low and potential harmful ability for environment is weakened obviously. It can indicate that forecasting the waste residue's potential harmful ability for environment by heavy metal's total quantity of waste residue is not exact. Leaching ability of heavy metal is significantly enhanced in extremely acidic and alkaline conditions. The leaching content of zinc, plumbum, chromium and cadmium is all up to maximum when pH is lower than three. The leaching ability of zinc, plumbum, chromium and cadmium is all increase when pH is higher than twelve, but its leaching content is lower than that in acidic condition. leaching ability of zinc, plumbum, chromium and cadmium is weakest in neutral condition. Under normal condition (pH of rainfall), harmful ability for environment of ancient smelted residue has decreased to a lower level.It can be treated according to the requirement of general industrial solid wastes.
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卷: 3 期: 4 页: 246-249 出版年: OCT 2010
https://blog.sciencenet.cn/blog-341648-395973.html
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