| Pyrite is one of the most widely distributed sulphide minerals in nature, the element Co, Ni, which usually contained in pytire, can be extracted in pyrite. Au is usually contained in pyrite, too. When extrace the valuable elements, pyrite palys an important role. Pyrite is one type of nature semiconductors, which is most widely distributed in nature. Different semicondutor type pyrite lead to different leaching behavior, so the research on different semiconductors type pyrite is very important.In the article, Castep in MS was used to make sure how different semiconductors type pyrite to become, well-crystallized pyrite and electrochemistry were used to study the electrochemistry behavior in chemistry and bacterial solutions. The mechanization is discussed to explain the diffierence with N type pyrite and P type pyrite.The castep module simulations showed that when there is presences of Fe atom loss, As atom substitute for S atom in pyrite shows the properties of P type pyrite; S atoms loss, Co atom and Ni atom substitute for Fe atoms shows the property of type N pyrite, N type pyrite’s DOS shift left, characterized by reduction enhanced.Studies on cyclic voltammetry showed that the process of pyrite anode reaction consist of multi-step. Through the redox potential information obtained from the cyclic voltammetry curve, consolidating the intermediate reaction process, pyrite was oxidized to ferric ion and sulfate finally. Studies on Tafel polarization curve under ferric ion and ferrous iom condition showed that the corrosion current is in proportion to the concentration of ferric ion, but not chaned with diffierent ferrous ion, N type pyrite was more susceptible to be oxidized and oxidation rate was faster than P type pyrite. The corrosion current of N type pyrite In the 3g/L, 6g/L,9g/L ferric conditions, the corrosion current of N type pyrite is respectively 3.66 times, 4.31 times,6.52 times higher than P type pyrite corrosion current. The corrosion current of N type pyrite In the 3g/L,6g/L,9g/L ferrous conditions, the corrosion current of N type pyrite is respectively 4.75 times,4.75 times,4.74 times higher than P type pyrite corrosion current.The CV analyse under bacteria condition shows that the reaction becomes more complex. Studies on Tafel polarization shows that, the corrosion current of N type pyrite is respectively 1.38 times,1.41 times,1.20 times of P type pyrite on the condition of initial ferrous concentration of 3g/L,6g/L,9g/L. N type pyrite is ealier to corrode than P type pyrite in bactria sulotion. |
