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

作　　者：Yao Wang Dan Xu Shan Gao Qi Chen Dayi Zhou Xin Fan Xin-Jian Li Lijie Chang Yuewen Zhang Hongan Ma Xiao-Peng Jia 王遥;徐丹;高姗;陈启;周大义;范鑫;李欣健;常立杰;张跃文;马红安;贾晓鹏(State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,China;Key Laboratory of Material Physics of Ministry of Education,School of Physics and Microeletronics,Zhengzhou University,Zhengzhou 450052,China)

机构地区：[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

出　　处：《Chinese Physics B》2022年第6期607-614,共8页中国物理B（英文版）

基　　金：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);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 highconductivity 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 

分 类 号：TD926.4[矿业工程—选矿]