A non-polluting method for rapidly purifying uranium-containing wastewater and efficiently recovering uranium through electrochemical mineralization and oxidative roasting

被引：43

作者：

Lv, Shao-yan ^{[1
]}

Li, Mi ^{[1
,2
]}

Wu, Xiao-yan ^{[1
]}

Zhang, Xiao-wen ^{[1
]}

Hua, Yi-long ^{[1
]}

Bi, Lei ^{[1
]}

Fang, Qi ^{[1
]}

Cai, Tao ^{[1
]}

机构：

[1] Univ South China, Sch Resource & Environm & Safety Engn, Hengyang 421001, Peoples R China

[2] Univ South China, Hengyang Key Lab Soil Pollut Control & Remediat, Hengyang 421001, Peoples R China

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2021年 / 416卷

基金：

中国国家自然科学基金;

关键词：

Electrochemical mineralization; Incorporation; Transformation; Uranium recovery; ZERO-VALENT IRON; TOTAL-ENERGY CALCULATIONS; AQUEOUS-SOLUTION; MAGNETITE NANOPARTICLES; CORE-SHELL; U(VI); IMMOBILIZATION; REDUCTION; REMOVAL; CARBON;

D O I：

10.1016/j.jhazmat.2021.125885

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Iron-based materials have been widely used for treating uranium-containing wastewater. However, the iron-uranium solids originating by treating radioactive water through pollutant transfer methods has become a new uncontrolled source of persistent radioactive pollution. The safe disposal of such hazardous waste is not yet well-resolved. The electrochemical mineralization method was developed to rapidly purify uranium-containing wastewater through lattice doping in magnetite and recover uranium without generating any pollutants. An unexpected isolation of U3O8 from uranium-doped magnetite was discovered through in-situ XRD with a temperature variation from 300 degrees C to 700 degrees C. Through HRTEM and DFT calculation, it was confirmed that the destruction of the inverse spinel crystal structure during the gradual transformation of magnetite into gamma-Fe2O3 and alpha-Fe2O3 promoted the migration, aggregation, and isolation of uranium atoms. Uniquely generated U3O8 and Fe2O3 were easily separated and over 80% uranium and 99.5% iron could be recovered. These results demonstrate a new strategy for uranium utilization and the environmentally friendly treatment of uranium-containing wastewater.

引用

页数：11