GLASS PHYSICS AND CHEMISTRY
·
2023
·Vol. 49
·期 5
·463-477
·
IF 0.7
Wence Xu,Cao Zhao,Ma Rui,Zhang Yuxuan,Wu Nannan,Ouyang Shunli
Abstract Utilizing mining and metallurgical waste as a resource is one of the effective methods to tackle the issue of solid waste accumulation. In this study, the CaO–MgO–Al 2 O 3 –SiO 2 system glass–ceramics were prepared based on the traditional melt-casting technique using iron ore slag as the main raw material. Investigations were done on how different iron ion concentrations affected glass–ceramics properties. And the migration pattern of iron ions was explored deeply using Raman spectroscopy and FTIR. XRD revealed the crystallization ability of augite and magnetite increasing as the iron ions grew. The combination of vibrating sample magnetometer, electron backscatter diffraction, and MFM techniques indicates that the distribution of magnetite, grain size, and structure are connected to the magnetic performances of glass–ceramics. Glass–ceramics has outstanding magnetic properties and flexural strength. Therefore, it has vast potential for future development in electronic devices, wear-resistant applications, and electromagnetic shielding.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2020
·
IF 7.246
Yun Li,Haotian Xue,Pekka Taskinen,Shenghai Yang,Chaobo Tang,Wei Jin,Yongming Chen,Ari Jokilaakso
This work proposes a novel environmentally-friendly, low temperature phase-conversion method for antimony extraction and studies its experimental application and feasibility in pyrite cinder waste co-treatment. The detailed phase transformations and microstructural evolution mechanisms during antimony extraction and sulfur fixation process were investigated. The results show that stibnite (Sb 2 S 3 ) can quickly transform to senarmontite (Sb 2 O 3 ) in the presence of Fe 2 O 3 and Na 2 CO 3 , and then Sb 2 O 3 will be continuously reduced into metallic Sb. Sulfur in Sb 2 S 3 was conserved as FeS and Na 2 S x O y (Na 2 S, Na 2 SO 4 and/or Na 2 S 2 O 3 ). As a result, sulfur was immobilized and recycled in the solid state resource, instead of emitting SO 2 gas. Laboratory-scale batch experiments employed pyrite cinder as sulfur-fixing agent indicate that more than 92.6% of antimony can be extracted and recovered by one step conversion from stibnite at 1123 K (850 °C) by this new technique. 97.3% of sulfur was fixed and converted to sulfide as matte and sulfate. In other words, SO 2 emissions were reduced by 97.3%. By-product elemental sulfur was produced after the water-leaching step, and finally producing industrial H 2 SO 4 . Iron contained in pyrite cinder waste will also be recycled. This novel method is an energy-saving, environmentally friendly and promising alternative for antimony extraction and waste treatment .
研究领域:
冶金学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Zhong Ma,Chuan Yuan,Shuai Zhang,Yonggang Lu,Junhui Xiong
Chemical looping combustion (CLC) is a clean and efficient flame-free combustion technology, which combust the fuels by lattice oxygen from a solid oxygen carrier with inherent CO 2 capture. The development of oxygen carriers with low cost and high redox performance is crucial to the whole efficiency of CLC process. As the solid by-product from the sulfuric acid production, pyrite cinder presented excellent redox performance as an oxygen carrier in CLC process. The main components in pyrite cinder are Fe 2 O 3 , CaSO 4 , Al 2 O 3 and SiO 2 in which Fe 2 O 3 is the active component to provide lattice oxygen. In order to systematic investigate the functions of supports (CaSO 4 , Al 2 O 3 and SiO 2 ) in pyrite cinder, three oxygen carriers (Fe 2 O 3 -CaSO 4 , Fe 2 O 3 -Al 2 O 3 and Fe 2 O 3 -SiO 2 ) were prepared and evaluated in this study. The results showed that Fe 2 O 3 -CaSO 4 displayed high redox activity and cycling stability in the multiple redox cycles. However, both Fe 2 O 3 -Al 2 O 3 and Fe 2 O 3 -SiO 2 experienced serious deactivation during redox reactions. It indicated that the inert Fe-Si solid solution (Fe 2 SiO 4 ) was formed in the spent Fe 2 O 3 -SiO 2 sample, which decreased the oxygen carrying capacity of this sample. The XPS results showed that the oxygen species on the surface of Fe 2 O 3 -CaSO 4 could be fully recovered after the 20 redox cycles. It can be concluded that CaSO 4 is the key to the high redox activity and cycling stability of pyrite cinder.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 51
·76782-76792
·
IF 5.19
Tian Tingting,Zhu Xinfeng,Song Zhongxian,Li Xindong,Zhang Wei,Mao Yanli,Chen Songtao,Wu Junfeng,Ouyang Guozi
In the existing research, most of the heterogeneous catalysts applied in the activation of persulfate to degrade organic pollutants were synthesized from chemical reagents in the laboratory. In this paper, we have obtained a spent iron ore (IO) residue directly collecting from the iron ore plants, and efficiently activating peroxydisulfate (PS) to produce reactive free radicals. The experimental results demonstrated that the IO could effectively activate PS to degrade tetracycline hydrochloride (TCH), with TCH removal rate reaching up to 85.6% within 2 h at room temperature. The TCH removal rate was increased with increasing iron ore dosage, while the more acidic pH condition would be favorable to TCH removal process. The material characterization results demonstrated that the dominant components of IO were Fe 3 O 4 and FeOOH. The transformation from Fe(II) to Fe(III) at the surface IO was observed after TCH degradation. What’s more, the quenching experiment and EPR detection results confirmed that the sulfate radical (SO 4 •− ) and hydroxyl radicals (•OH) would be acting as the main free radicals for TCH degradation. This study could not only explore a novel way to recycle the discarded iron ore, but also further expand its application in an effective activation of PS in an aqueous solution. Graphical abstract
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）