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Wang Z, Zhao Z, Zhang L, Liu F, Peng B, Chai L, Liu D, Liu D, Wang T, Liu H, Liang Y. Formation mechanism of zinc-doped fayalite (Fe 2-xZn xSiO 4) slag during copper smelting. JOURNAL OF HAZARDOUS MATERIALS 2019; 364:488-498. [PMID: 30388632 DOI: 10.1016/j.jhazmat.2018.10.071] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 10/20/2018] [Accepted: 10/22/2018] [Indexed: 05/22/2023]
Abstract
The interactions between Fe2SiO4 and ZnO play an essential role in the recovery of zinc from copper slag. The dissolution and substitution mechanism of ZnO in fayalite were investigated by using TG-DSC, XRD, PPMS DynaCool, XPS, Mossbauer and SEM-EDS analyses and compared with MS calculation results. The results indicate that the dissolution and substitution are actually processes of the penetrating dissolution of Zn(II) ions that can be divided into three steps: 1) ZnO dissociates into Zn1-yO and Zn(II) ions; 2) Zn(II) penetrates the gap of the octahedron outer layer to substitute Fe(II) sites in the internal structure of SiOFe(II) (M2) to form (Fe2-x, Znx)SiO4; 3) Fe(II) is forced to migrate to the surface of (Fe2-x, Znx)SiO4 to form (Zn1-y, Fe(II)y)O. These findings can be derived the occurrence state and distribution of zinc in copper slag theoretically.
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Affiliation(s)
- Zhongbing Wang
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China
| | - Zongwen Zhao
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China
| | - Lifeng Zhang
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China
| | - Fansong Liu
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China
| | - Bing Peng
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 410083, Changsha, Hunan, China
| | - Liyuan Chai
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 410083, Changsha, Hunan, China
| | - Dachun Liu
- The National Engineering Laboratory of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming, 650093, China
| | - Degang Liu
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China
| | - Tianyu Wang
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China
| | - Hui Liu
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 410083, Changsha, Hunan, China.
| | - Yanjie Liang
- School of Metallurgy & Environment, Central South University, 410083, Changsha, Hunan, China; Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, 410083, Changsha, Hunan, China.
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Abstract
Gamma irradiation studies of (Mg0.905Fe0.095)2SiO4 olivine were performed using X-ray fluorescence method, X-ray diffraction, Raman and Mössbauer spectroscopy. The absorbed doses were 300, 600 and 1000 Gy. Small irradiation doses cause an increase of lattice vibrations and small deformation of both M1 and M2 octahedron. The observed effect is similar to the results expose to high temperature. However, the small deformation takes place only in unit cell of Olivine’s structure.
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Navarro-Ruiz J, Ugliengo P, Rimola A, Sodupe M. B3LYP periodic study of the physicochemical properties of the nonpolar (010) Mg-pure and fe-containing olivine surfaces. J Phys Chem A 2014; 118:5866-75. [PMID: 24517343 DOI: 10.1021/jp4118198] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
B3LYP periodic simulations have been carried out to study some physicochemical properties of the bulk structures and the corresponding nonpolar (010) surfaces of Mg-pure and Fe-containing olivine systems; i.e., Mg2SiO4 (Fo) and Mg1.5Fe0.5SiO4 (Fo75). A detailed structural analysis of the (010) Fo and Fo75 surface models shows the presence of coordinatively unsaturated metal cations (Mg(2+) and Fe(2+), respectively) with shorter metal-O distances compared to the bulk ones. Energetic analysis devoted to the Fe(2+) electronic spin configuration and to the ion position in the surfaces reveals that Fe(2+) in its quintet state and placed at the outermost positions of the slab constitutes the most stable Fe-containing surface, which is related to the higher stability of high spin states when Fe(2+) is coordinatively unsaturated. Comparison of the simulated IR and the corresponding reflectance spectra indicates that Fe(2+) substitution induces an overall bathochromic shift of the spectra due to the larger mass of Fe compared to Mg cation. In contrast, the IR spectra of the surfaces are shifted to upper values and exhibit more bands compared to the corresponding bulk systems due to the shorter metal-O distances given in the coordinatively unsaturated metals and to symmetry reduction which brings nonequivalent motions between the outermost and the internal modes, respectively.
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Affiliation(s)
- Javier Navarro-Ruiz
- Departament de Química, Universitat Autònoma de Barcelona , 08193 Bellaterra, Barcelona, Spain
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