ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·54556-54567
·
IF 5.8
Zhang Ge,Yang Huifen,Li Xuan,Zhou Yichen,Guo Song,Zhao Tong
The control of multiple heavy metals (HMs) pollution in solid wastes, especially the co-contamination of As and other heavy metal cations, is of great importance to ecological and environmental health. To address this problem, the preparation and application of multifunctional materials have attracted wide attention. In this work, a novel Ca-Fe-Si-S composite (CFSS) was applied to stabilize As, Zn, Cu, and Cd in acid arsenic slag (ASS). The CFSS exhibited synchronous stabilization ability for As, Zn, Cu, Cd and owned strong acid neutralization capacity. Under simulated field conditions, the acid rain extracted HMs in ASS successfully decreased below the emission standard (GB 3838–2002-IV category in China) after incubated by 5% CFSS for 90 days. Meanwhile, the application of CFSS promoted the transformation of leachable HMs into less accessible forms, which was conductive to the long-term stabilization for HMs. There was competitive relation among the three heavy metal cations, following the stabilization sequence of Cu > Zn > Cd during incubation. And the stabilization mechanisms of HMs by CFSS were proposed as chemical precipitation, surface complexation, and ion/anion exchange. The research will be greatly conducive to the remediation and governance of field multiple HMs contaminated sites.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOM
·
2023
·Vol. 75
·期 11
·4910-4921
·
IF 2.6
Zhang Jiahe,Feng Wenyu,Cao Huazhen,Zhang Huibin,Zheng Guoqu
This study explored a highly selective and efficient oxidation system for the recovery of rhenium resources from Re-rich arsenic sulfide slag containing significant quantities of arsenic. The effects of H 2 O 2 dosage, initial H 2 SO 4 concentration and leaching temperature on the Re, As and Bi extraction efficiency were investigated in detail. The results demonstrated that under the most favorable conditions of 20 mL H 2 O 2 , 70°C, 0.25 mol L −1 H 2 SO 4 solution, the Re extraction efficiency can reach 99.2%. The phase transitions of the main constituents of the slag, Re, As and Bi were analyzed. ReS 2 and Re 2 S 7 in the Re-rich arsenic sulfide slag were transformed to ReO 4 − , impelling Re to enter the leachate. Bi and As were oxidized and entered the leachate in ionic form under a limited H 2 O 2 dosage. As the H 2 O 2 dosage increased, the concentration of Bi and As in the leachate reached a threshold value and transformed to stable BiAsO 4 , resulting in the attenuation of As and Bi extraction efficiency. This process considerably promoted the selective leaching of Re and the separation of Re from As and Bi. Kinetic analysis shows that the leaching process is controlled by chemical reaction with an apparent activation energy of 29.05 kJ mol −1 .
研究领域:
冶金工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 12
·1-12
·
IF 3.8
Zhang Ge,Yang Huifen,Lin Xingjie,Miao Yu,Zhang Chi,Li Fangze,Pang Zhikun,Xin Xin
In this work, a novel Ca-Fe-Si-S composite was prepared from thermal desorption residue through FeSO 4 impregnation-pyrolysis. The characteristics and modification process of the composite were specified through a series of analytical methods. And stabilization experiments were conducted to investigate the performance of prepared materials. The optimal Ca–Fe–Si–S composite was obtained at impregnation ratio of 10%, pyrolysis temperature of 900℃ and pyrolysis time of 60 min. The modification process included the dissolution of calcium hydroxide, the formation of gypsum and ferrous silicate, the dehydration of gypsum, the reduction decomposition of calcium sulfate, the decomposition of calcium carbonate and the solid reaction at high temperature. The obtained optimal Ca–Fe–Si–S composite was a multifunctional material mainly composed of high contents of Ca, Fe, Si, S, which corresponding to FeS, CaS, Ca 2 SiO 4 , Ca 3 Al 2 (SiO 4 ) 3 , Ca 3 Fe 2 (SiO 4 ) 3 , Ca 5 (SiO 4 ) 2 SO 4 . The application of 5% optimal Ca–Fe–Si–S composite successfully lowed the leaching concentrations of As, Zn, Cu, Cd in arsenic slag to meet the discharging standard. Meanwhile, the non-specifically bound and specifically bound of As totally decreased by 3.72%, and the acid extractable species of Zn, Cu, Cd reduced by 11.20%, 29.37%, 2.76% respectively. The distribution of stable species for heavy metals significantly increased as united results of surface complexation, chemical precipitation and ion/anion exchange reactions between the prepared composite and heavy metals. The findings of this research provide an effective material for the simultaneous stabilization of multiple heavy metals.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）