摘要
The study on arsenopyrite and realgar of bacterial oxidation shows that the chemical behaviors of different arsenic-bearing sulphides oxidated by thermophilic bacteria are quite distinct. Arsenopyrite is active and quickly eroded in bacteria-bearing solution. With a high leaching rate over 95%, the arsenopyrite phase cannot be detected by X-ray diffraction(XRD). Arsenopyrite is highly toxic to bacteria that at the initial stage of bio-oxidation, bacterial growth is inhibited and the number of bacterium cell drops from 2.26 × 108/mL to the lowest 2.01 × 105/mL. At the later stages of bio-oxidation, bacteria grow fast and reach 2.23 × 108/mL. Comparably, realgar is inertial and resistive to bacterial corrosion and oxidation. Arsenic in realgar crystal is hard to be leached and the residue is still realgar phase, as indicated by XRD. The cell number of bacteria varies a little, decreasing from 2.26 × 108/mL to 2.01 × 107/mL, during the bacterial oxidation. The results show that the crystal structure and arsenic valency of arsenic-bearing sulphides play a vital role during the leaching process of bacterial oxidation.
The study on arsenopyrite and realgar of bacterial oxidation shows that the chemical behaviors of different arsenic-bearing sulphides oxidated by thermophilic bacteria are quite distinct. Arsenopyrite is active and quickly eroded in bacteria-bearing solution. With a high leaching rate over 95%, the arsenopyrite phase cannot be detected by X-ray diffraction(XRD). Arsenopyrite is highly toxic to bacteria that at the initial stage of bio-oxidation, bacterial growth is inhibited and the number of bacterium cell drops from ~2.26×108/mL to the lowest ~2.01×105/mL. At the later stages of bio-oxidation, bacteria grow fast and reach 2.23×108/mL. Comparably, realgar is inertial and resistive to bacterial corrosion and oxidation. Arsenic in realgar crystal is hard to be leached and the residue is still realgar phase, as indicated by XRD. The cell number of bacteria varies a little, decreasing from ~2.26×108/mL to ~2.01×107/mL, during the bacterial oxidation. The results show that the crystal structure and arsenic valency of ~arsenic-bearing sulphides play a vital role during the leaching process of bacterial oxidation.
出处
《中国有色金属学会会刊:英文版》
CSCD
2005年第3期648-652,共5页
Transactions of Nonferrous Metals Society of China
基金
Projects(50274024
50074015)supportedbytheNationalNaturalScienceFoundationofChina
Project(20022022)supportedbytheNaturalScienceFoundationofLiaoningProvince
关键词
喜温细菌
化学性质
含砷黄铁矿
氧化冶炼
thermophilic bacteria
bacterial oxidation
chemical behavior
arsenopyrite
realgar
toxicity