中国物理B ›› 2022, Vol. 31 ›› Issue (6): 66206-066206.doi: 10.1088/1674-1056/ac4a72

• • 上一篇    下一篇

Reaction mechanism of metal and pyrite under high-pressure and high-temperature conditions and improvement of the properties

Yao Wang(王遥)1, Dan Xu(徐丹)1, Shan Gao(高姗)1, Qi Chen(陈启)1, Dayi Zhou(周大义)1, Xin Fan(范鑫)1, Xin-Jian Li(李欣健)1, Lijie Chang(常立杰)1, Yuewen Zhang(张跃文)2,†, Hongan Ma(马红安)1,‡, and Xiao-Peng Jia(贾晓鹏)1,2   

  1. 1 State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
    2 Key Laboratory of Material Physics of Ministry of Education, School of Physics and Microeletronics, Zhengzhou University, Zhengzhou 450052, China
  • 收稿日期:2021-11-22 修回日期:2022-01-03 接受日期:2022-01-12 出版日期:2022-05-17 发布日期:2022-05-17
  • 通讯作者: Yuewen Zhang, Hongan Ma E-mail:zhangyw@zzu.edu.cn;maha@jlu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 51171070), the Project of Jilin Science and Technology Development Plan (Grant No. 20170101045JC), the Natural Science Foundation of Chongqing, China (Grant No. cstc2019jcyj-msxmX0391), and the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN201901405).

Reaction mechanism of metal and pyrite under high-pressure and high-temperature conditions and improvement of the properties

Yao Wang(王遥)1, Dan Xu(徐丹)1, Shan Gao(高姗)1, Qi Chen(陈启)1, Dayi Zhou(周大义)1, Xin Fan(范鑫)1, Xin-Jian Li(李欣健)1, Lijie Chang(常立杰)1, Yuewen Zhang(张跃文)2,†, Hongan Ma(马红安)1,‡, and Xiao-Peng Jia(贾晓鹏)1,2   

  1. 1 State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, China;
    2 Key Laboratory of Material Physics of Ministry of Education, School of Physics and Microeletronics, Zhengzhou University, Zhengzhou 450052, China
  • Received:2021-11-22 Revised:2022-01-03 Accepted:2022-01-12 Online:2022-05-17 Published:2022-05-17
  • Contact: Yuewen Zhang, Hongan Ma E-mail:zhangyw@zzu.edu.cn;maha@jlu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 51171070), the Project of Jilin Science and Technology Development Plan (Grant No. 20170101045JC), the Natural Science Foundation of Chongqing, China (Grant No. cstc2019jcyj-msxmX0391), and the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN201901405).

摘要: Pyrite tailings are the main cause of acid mine wastewater. We propose an idea to more effectively use pyrite, and it is modified by exploiting the reducibility of metal represented by Al under high-pressure and high-temperature (HPHT) conditions. Upon increasing the Al addition, the conductivity of pyrite is effectively improved, which is nearly 734 times higher than that of unmodified pyrite at room temperature. First-principles calculations are used to determine the influence of a high pressure on the pyrite lattice. The high pressure increases the thermal stability of pyrite, reduces pyrite to high-conductivity Fe7S8 (pyrrhotite) by Al. Through hardness and density tests the influence of Al addition on the hardness and toughness of samples is explored. Finally we discuss the possibility of using other metal-reducing agents to improve the properties of pyrite.

关键词: high-pressure and high-temperature (HPHT), pyrite, thermoelectric properties, waste recycling

Abstract: Pyrite tailings are the main cause of acid mine wastewater. We propose an idea to more effectively use pyrite, and it is modified by exploiting the reducibility of metal represented by Al under high-pressure and high-temperature (HPHT) conditions. Upon increasing the Al addition, the conductivity of pyrite is effectively improved, which is nearly 734 times higher than that of unmodified pyrite at room temperature. First-principles calculations are used to determine the influence of a high pressure on the pyrite lattice. The high pressure increases the thermal stability of pyrite, reduces pyrite to high-conductivity Fe7S8 (pyrrhotite) by Al. Through hardness and density tests the influence of Al addition on the hardness and toughness of samples is explored. Finally we discuss the possibility of using other metal-reducing agents to improve the properties of pyrite.

Key words: high-pressure and high-temperature (HPHT), pyrite, thermoelectric properties, waste recycling

中图分类号:  (High-pressure effects in solids and liquids)

  • 62.50.-p
72.15.Jf (Thermoelectric and thermomagnetic effects) 72.20.-i (Conductivity phenomena in semiconductors and insulators)