Increased dissolution of ilmenite induced by high-energy ball milling

2019-10-31 17:15:49

milling dissolution ilmenite FeTiO3 Fe2Ti3O9

责任者: Chen, Y.;Williams, J.S.;Campbell, S.J.;Wang, G.M. 单位: Inst. of Adv. Studies, Australian Nat. Univ., Canberra, ACT, Australia 来源出处: Materials Science Engineering A (Structural Materials: Properties, Microstructure and Processing)(Mater. Sci. Eng. A, Struct. Mater., Prop. Microstruct. Process. (Switzerland)),1999/11/01,A271(1-2):485-90 摘要: High-energy ball milling treatment leads to full dissolution of natural ilmenite sands containing both FeTiO3 and Fe2Ti3O9 phases in a sulphuric acid solution at 100°C. The ilmenite material has been milled for various times in two environments (vacuum and air), and characterised by X-ray diffraction, Mossbauer spectroscopy and surface area analysis. It is found that after milling for only 10 h, 50% of the sample can be dissolved as a result of the increased surface area, nanocrystalline structure and high level of lattice distortion present in the milled sample. Complete dissolution of the ilmenite is obtained on extended milling (200 h) in an oxygen free atmosphere. This occurs as a result of a gradual reduction of the Fe3+ phase (Fe2Ti3O9) to the relatively more soluble Fe2+ phase (FeTiO3) on milling in vacuum. The results overall show that the chemical reactivity of milled materials can be affected significantly by the milling conditions and environment 关键词: adsorption;dissolving;elastic deformation;iron compounds;minerals;Mossbauer effect;nanostructured materials;powder technology;reduction (chemical);surface topography;ilmenite;dissolution properties;high-energy ball milling;natural ilmenite sands;sulphuric acid solution;FeTiO3-Fe2Ti3O9 mixture;vacuum milling;air milling;X-ray diffraction;Mossbauer spectroscopy;surface area analysis;surface area evolution;nanocrystalline structure;lattice distortion;ilmenite complete dissolution;Fe3+ phase contents;Fe2+ phase solubility;chemical reactivity;milling time dependence;milling-reactivity relation;200 h;100 C;FeTiO3-Fe2Ti3O9;FeTiO3;Fe2Ti3O9