| 碳酸盐体系中pH对Cu2+诱导结晶过程的影响 |
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| 引用本文： | 陈 坚,袁 鹏,蔡思鑫,陶 涛,王凯军.碳酸盐体系中pH对Cu2+诱导结晶过程的影响[J].环境科学研究,2015,28(1):96-102. |
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| 作者姓名： | 陈 坚 袁 鹏 蔡思鑫 陶 涛 王凯军 |
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| 作者单位： | 1.清华大学环境学院环境, 环境模拟与污染控制国家重点联合实验室, 北京 100084 |
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| 基金项目： | 国家自然科学基金项目(21307072);国家水体污染控制与治理科技重大专项(2012ZX07205-002);国家高技术发展研究计划(863)项目(2011AA06090102) |
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| 摘 要： | 在流化床中,以含Cu2+废水为处理对象,考察了碳酸盐体系中pH的改变对Cu2+诱导结晶过程的影响. 结果表明:当进水ρ(Cu2+)为200 mg/L、沉淀剂pH为10.2时,经回流系统拦截,微晶产率可降低0.5%~1.0%,Cu2+的去除率可达99.0%以上. 经XRD(X射线衍射)分析表明,结晶产物以碱式碳酸铜为主,晶型呈短杆状,尺寸较为均一；当沉淀剂pH升至12.2时,Cu2+的去除率降至95.0%,系统出水结晶产物晶型特征不明显,尺寸不均,XRD结果显示为氢氧化铜、碱式碳酸铜、碳酸钙等混合结晶产物,晶体衍射峰多存在宽化现象,表明高pH下结晶产物晶化程度较低.
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| 关 键 词： | 碳酸盐系统 诱导结晶 pH 结晶产物 |
| 收稿时间： | 2014/3/17 0:00:00 |
| 修稿时间： | 2014/4/2 0:00:00 |
Impacts of pH on the Process of Crystallization Induced by Copper in Carbonate System |
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| CHEN Jian,YUAN Peng,CAI Sixin,TAO Tao and WANG Kaijun.Impacts of pH on the Process of Crystallization Induced by Copper in Carbonate System[J].Research of Environmental Sciences,2015,28(1):96-102. |
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| Authors: | CHEN Jian YUAN Peng CAI Sixin TAO Tao and WANG Kaijun |
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| Institution: | CHEN Jian;YUAN Peng;CAI Sixin;TAO Tao;WANG Kaijun;State Key Joint Laboratory of Environment Simulation and Pollution Control,School of Environment,Tsinghua University;School of Environmental Science and Engineering,Huazhong University of Science and Technology;School of Water Resource and Environment,China University of Geosciences ( Beijing); |
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| Abstract: | Abstract:The crystallization process of copper removal by sodium carbonate was investigated in a seeded fluidized bed reactor. The influence of pH value of the precipitation agent on the copper conversion and removal efficiency was tested. The results indicated that 99.0% copper removal efficiency was achieved, while the fine generation efficiency was decreased by 0.5%-1.0% under conditions of influent copper 200 mg/L, pH value of precipitation agent 10.2 and optimal recycle flow rate. The sizes of the fine particles were uniform and present as rod-like. The crystal was identified as basic copper carbonate by X-ray diffraction (XRD). With pH of the reagent increased to 12.2, the removal efficiency of copper decreased to 95.0% and the crystals showed unclear crystallization characteristics, low degree of crystallization and irregular size. The XRD results indicated the fine fraction were a mixture of copper hydroxide, basic copper carbonate and calcium carbonate. |
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| Keywords: | carbonate system induced crystallization pH crystallization product |
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