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| Selection of Amendments for Acidified Copper Mine Tailings |
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| KeyWord:amendment; copper mine tailings; heavy metals; root elongation |
| Author Name | Affiliation | | YU Hai-bo | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences | | HUANG Shu-tao | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences | | SONG Jing | Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences
University of Chinese Academy of Sciences, | | ZHOU Shou-biao | College of Life Science, Anhui Normal University | | LUO Yong-ming | Key Laboratory of Coastal Zone Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences
University of Chinese Academy of Sciences, |
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| Abstract: |
| Amendment is essential for reclamation and ecological restoration of metal mine tailings. The present study is aimed to select amendments for acidified copper mine tailings from Tongling, Anhui Province by using barley root elongation test as well as measurement of available heavy metals by chemical extraction. The results showed that in the presence of 1.9% of cow manure, as the pH of mine tailings increased to near neutral, available heavy metals（NaNO3-extractable metals） and non-specifically adsorbed As measured by（NH4）2SO4-extraction decreased significantly, On the contrary, specifically adsorbed As measured by NH4H2PO4-extraction is increasing with pH. Barley root length increased first and then reduced by addition of Ca（OH）2 with the lowest toxicity occurring at 0.9% of Ca（OH）2 and pH5.3. With the addition of 1% Ca（OH）2 and 1.9% cow manure, the pH of mine tailings and the barley root length were not significant influenced by the addition of attapulgite, bentonite, zeolite or phosphate rock. Therefore, it is concluded that 1% Ca（OH）2 and 1.9% cow manure is the ideal amendment for the acidified copper mine tailings. |
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