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金属矿山 ›› 2023, Vol. 52 ›› Issue (11): 81-90.

• “矿物材料基础理论与应用技术”专题 • 上一篇    下一篇

磷石膏 / 固硫灰渣复合材料对铀( Ⅵ )的吸附行为及机理研究

夏 雪1,2 周 磊2 杨国辉1 廖志慧1,2 聂小琴3 董发勤1,4
  

  1. 1. 西南科技大学环境与资源学院,四川 绵阳 621010;2. 核废物与环境安全国防重点学科实验室,四川 绵阳 621010;3. 西南科技大学国防科技学院,四川 绵阳 621010;4. 固体废物处理与资源化教育部重点实验室,四川 绵阳 621010
  • 出版日期:2023-11-15 发布日期:2024-01-02
  • 基金资助:
    国家自然科学基金项目(编号:41831285,42272357,42377202)。

Adsorption Behavior and Mechanism of Phosphogypsum / Sulfur-fixing Ash Composite for Uranium (Ⅵ)

XIA Xue1,2 ZHOU Lei2 YANG Guohui1 LIAO Zhihui1,2 NIE Xiaoqin3 DONG Faqin1,4 #br#   

  1. 1. School of Environment and Resource,Southwest University of Science and Technology,Mianyang 621010,China;2. National Defense Key Discipline Laboratory of Nuclear Waste and Environmental Security,Mianyang 621010,China;3. School of National Defence Science and Technology,Southwest University of Science and Technology,Mianyang 621010,China;4. Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education,Mianyang 621010,China
  • Online:2023-11-15 Published:2024-01-02

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摘要： 为了减少磷石膏(PG)和固硫灰渣(SFA)这两种工业固体废弃物在环境中的堆积以及避免其给自然环 境带来的风险,最大化降低对环境的污染,以 PG 和 SFA 为原料,采用一步高温煅烧法制备了磷石膏/ 固硫灰渣( PG / SFA)新型复合吸附材料,同时采用批次静态吸附法研究了 PG / SFA 对的铀(Ⅵ)吸附性能。 并利用 PG / SFA 较强的亲 铀特性,对铀矿开采过程中产生的铀矿坑水开展了深度净化处理应用研究。 最后,结合 SEM、FTIR 和 XRD 表征手段, 探讨了 PG / SFA 对铀的吸附机理。 结果表明:在 pH = 6. 0、吸附剂 PG / SFA 投加量 0. 02 g、吸附时间 60 min、铀初始浓 度 125 mg / L、吸附温度 40 ℃的条件下,PG / SFA 对铀的吸附量可达 84. 6 mg / g;PG / SFA 对铀的吸附符合准二级动力学 模型和 Langmuir 等温吸附模型;水中共存阴、阳离子(Ba2+、Sr2+、Ni2+、Ca2+、Cl-、NO- 3 、CO23-、F- )对 PG / SFA 吸附铀的性 能基本无影响。 在真实铀矿坑水中,PG / SFA 对铀的去除率可达 99. 8%,分配系数(Kd)高达 1. 46×106 mL / g,出水铀浓 度低至 0. 003 mg / L。 PG / SFA 对铀的吸附机理主要为 PG / SFA 中的 Ca2+和 PO34- 与 UO22+ 发生沉淀反应,并进一步在 PG / SFA 表面生成钙铀云母 Ca(UO2)2(PO4)2· 3H2O 矿相结构。 研究表明,利用工业固废磷石膏和固硫灰渣可作为铀 矿坑水的高效吸附材料,从而实现“以废治废”的目标。

关键词: 磷石膏, 固硫灰渣, 吸附, 铀矿坑水, 以废治废

Abstract: In order to reduce the accumulation of phosphogypsum ( PG) and sulfur-fixing ash ( SFA) in the environment,avoid the risks to the natural environment and minimize the environmental pollution,a new composite adsorption material of phosphogypsum / sulfur-fixing ash ( PG / SFA) was prepared by one-step high-temperature calcination method with PG and SFA as raw materials,and the uranium [ U( Ⅵ )] of PG / SFA was studied by batch static adsorption method. Based on the strong U(Ⅵ ) affinity of PG / SFA,the deep purification treatment of uranium mine water produced in the process of U( Ⅵ ) mining was studied. Finally,the adsorption mechanism of PG / SFA for U( Ⅵ ) was discussed by means of SEM,FTIR and XRD. The results show that the adsorption capacity of PG / SFA for U(Ⅵ) can reach 84. 6 mg / g under the conditions of pH of 6. 0,PG / SFA adsorbent dosage of 0. 02 g,adsorption time of 60 min,initial concentration of U(Ⅵ) of 125 mg / L and adsorption temperature of 40 ℃ . The adsorption of U(Ⅵ) by PG / SFA accords with pseudo-second-order kinetic model and Langmuir isothermal adsorption model. The coexistence of anions and cations (Ba2+,Sr2+,Ni2+,Ca2+,Cl-,NO- 3 ,CO23-,F- ) in water has little effect on the U(Ⅵ) adsorption performance of PG / SFA. In real uranium mine water,the removal rate of U(Ⅵ ) by PG / SFA can reach 99. 8%,the distribution coefficient (Kd) is as high as 1. 46×106 mL / g,and the effluent U(Ⅵ ) concentration is as low as 0. 003 mg / L. The adsorption mechanism of U(Ⅵ) by PG / SFA is mainly that Ca2+ and PO34- in PG / SFA react with UO2+ 2 by precipitation,and then autunite Ca( UO2 )2( PO4 )2· 3H2O mineral phase structure is formed on the surface of PG / SFA. Therefore,the utilization of industrial solid waste phosphogypsum and sulfur-fixing ash can be used as efficient adsorption materials for uranium mine water,thus achieving the goal of " treating waste with waste" .

Key words: phosphogypsum,sulfur-fixing ash,adsorption,uranium mine water,treat waste with waste

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