| 骨炭钝化含黄铁矿多重金属尾矿的研究 |
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| 引用本文： | 周继梅,岳停停,周磊,刘璟,谌书.骨炭钝化含黄铁矿多重金属尾矿的研究[J].岩石矿物学杂志,2018,37(3):485-491. |
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| 作者姓名： | 周继梅 岳停停 周磊 刘璟 谌书 |
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| 作者单位： | 西南科技大学固体废物处理与资源化教育部重点实验室 |
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| 基金项目： | 国家自然科学基金项目（41372051）；四川省科技厅国际合作项目（2016HH0086） |
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| 摘 要： | 钝化处理被广泛应用于含重金属尾矿的处理,可以从源头上防止酸矿废水(AMD)的产生,寻找一种价廉易得且对环境危害小的钝化剂十分必要。本文主要研究在骨炭作用下,用pH值为4的双氧水对黄铁矿进行氧化,探讨骨炭对黄铁矿氧化释放重金属的钝化作用。实验结果表明,添加不同含量的骨炭(分别为0.5、2.5和5 g)能将溶液的pH值分别提高到8.93、10.01和10.42,表明骨炭具有较强的中和能力,同时黄铁矿氧化释放的Pb、Zn和Cd等重金属离子浓度明显地降低。但当骨炭含量超过2.5 g时,对As有促进释放的趋势。红外光谱分析显示钝化后黄铁矿样品位于420、563、603、1 044、1 091 cm~(-1)处的特征峰主要来自PO_4~(3-)的振动,XRD进一步揭示了黄铁矿表面主要含磷次生矿物是磷铁矿和羟磷铁铅石,这些次生矿物对重金属钝化起着重要作用。因此,骨炭有望作为钝化含多重金属尾矿的钝化剂。
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| 关 键 词： | 骨炭 黄铁矿 重金属 次生矿物 钝化 |
| 收稿时间： | 2017/11/1 0:00:00 |
A study of the passivation of heavy metals in the pyrite tailings by bone char |
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| ZHOU Ji-mei,YUE Ting-ting,ZHOU Lei,LIU Jing and CHEN Shu.A study of the passivation of heavy metals in the pyrite tailings by bone char[J].Acta Petrologica Et Mineralogica,2018,37(3):485-491. |
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| Authors: | ZHOU Ji-mei YUE Ting-ting ZHOU Lei LIU Jing and CHEN Shu |
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| Institution: | Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China,Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China,Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China,Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China and Key Laboratory of Solid Waste Treatment and Resource, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China |
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| Abstract: | The passivation treatments are widely used for treating tailings which contain heavy metals with the purpose of preventing the production of acid mine drainage(AMD)from the sources. Therefore, it is very important to find an inexpensive passivator which causes little harm to the environment. In this paper, the authors used H2O2(pH=4)as an oxidant to oxidize the pyrite so as to discuss the passivation effect of bone char on the oxidation and release of heavy metals from pyrite. The results showed that the bone char had a strong neutralization capability, and the addition of bone char(different contents of 0.5 g, 2.5 g, 5 g) resulted in pH increase in the solutions, which were 8.93, 10.01 and 10.42, respectively. The presence of bone char decreased the release of Pb, Zn and Cd, but the release of As increased when the bone char was over 2.5 g. The infrared spectroscopy (FTIR)showed that the characteristic peaks at 420, 563, 603, 1 044, 1 091 cm-1 belong to vibration of PO43- produced by the dissolution of the bone char. XRD analysis suggested that the secondary mineral phases on the surface of the pyrite were graftonite and phosphogartrellite, which played an important role in heavy metals immobilization. As a passivating agent, bone char is most suitable for treating pyrite tailings which contain heavy metals. |
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| Keywords: | bone char pyrite heavy metal secondary mineral phases passivation |
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