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

doi:10.1088/1674-1056/ac4a72

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.

Keywords: high-pressure and high-temperature (HPHT) pyrite thermoelectric properties waste recycling

Received: 22 November 2021
Revised: 03 January 2022
Accepted manuscript online: 12 January 2022

PACS:	62.50.-p	(High-pressure effects in solids and liquids)
	72.15.Jf	(Thermoelectric and thermomagnetic effects)
	72.20.-i	(Conductivity phenomena in semiconductors and insulators)

Fund: 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).

Corresponding Authors: Yuewen Zhang, Hongan Ma
E-mail: zhangyw@zzu.edu.cn;maha@jlu.edu.cn

Cite this article:

Yao Wang(王遥), Dan Xu(徐丹), Shan Gao(高姗), Qi Chen(陈启), Dayi Zhou(周大义), Xin Fan(范鑫), Xin-Jian Li(李欣健), Lijie Chang(常立杰),Yuewen Zhang(张跃文), Hongan Ma(马红安), and Xiao-Peng Jia(贾晓鹏) Reaction mechanism of metal and pyrite under high-pressure and high-temperature conditions and improvement of the properties 2022 Chin. Phys. B 31 066206

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

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