In-situ high temperature X-ray diffraction study on the phase transition process of polymetallic sulfide ore

2nd International Conference on Mining, Material and Metallurgical Engineering

矿业工程;材料科学;冶金学

Li, Guangshi^1 ; Cheng, Hongwei^1,2 ; Xiong, Xiaolu^1 ; Lu, Xionggang^1,2 ; Xu, Cong^1 ; Lu, Changyuan^1 ; Zou, Xingli^1,2 ; Xu, Qian^1,2

School of Materials Science and Engineering, Shanghai University, Shanghai

200072, China^1

State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai

200072, China^2

关键词: Crystal transformation;    High temperature X-ray diffraction;    Monosulfide solid solutions;    N2 atmospheres;    Phase Change;    Polymetallic sulfide ores;    Temperature range;    Transition process;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/191/1/012037/pdf
DOI  :  10.1088/1757-899X/191/1/012037

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The phase transformation of the polymetallic sulfide ore is quite complicated, especially the variety and diversity of the roasted intermediate. The mineralogy properties of the ore particles were characterized by XRF, ICP and SEM-EDS. The thermal stability of the complex ore was investigated using TG-DSC under different atmosphere (pure N2and 1% O2-N2). The phase changes and intermediates were revealed by the in-situ XRD in pure N2and 1% O2-N2atmospheres with the temperature range from 25 to 800°C. These results indicated that the crystal transformation of the pyrrhotite from monoclinic to hexagonal at 320°C, and the pentlandite and chalcopyrite were decomposed into monosulfide solid solution in pure N2. While the pentlandite and chalcopyrite were completely oxidized into M∗xFe3-xO4(M∗=Fe, Ni, Cu) and Fe2O3, which is also the final product of the ore sample oxidized under 1% O2-N2atmosphere.