摘要
The paper presents a preliminary analysis of the kinetics of bacterial pretreatment of arsenical gold ore concentrate from Banbishan,Hebei.The batchwise bioprocessing of the concentrates was carried out in a 10L gas-lift loop reactor with 1 kg load using a mixed strain of Thiobacillus ferrooxidans and Thiobacillus thiooxidans.The level of dearsenication reached above 80% in 5 days of leaching.Comparison of the modelling with experimental data on dearsenication indicates that the bacterial growth can be described by the Monod equation,and modification is also necessary to reflect the inhibition due to the accumulated arsenic in the leaching solution.The leaching of arsenic and iron may be approached with the shrinking-core model,and the dearsenication rate seems to be limited by intraparticle diffusion of Fe3+ iron when the mechanism of indirect oxidation of arsenopyrite during bacterial pretreatment is assumed.
The paper presents a preliminary analysis of the kinetics of bacterial pretreatment of arsenical gold ore concentrate from Banbishan,Hebei.The batchwise bioprocessing of the concentrates was carried out in a 10L gas-lift loop reactor with 1 kg load using a mixed strain of Thiobacillus ferrooxidans and Thiobacillus thiooxidans.The level of dearsenication reached above 80% in 5 days of leaching.Comparison of the modelling with experimental data on dearsenication indicates that the bacterial growth can be described by the Monod equation,and modification is also necessary to reflect the inhibition due to the accumulated arsenic in the leaching solution.The leaching of arsenic and iron may be approached with the shrinking-core model,and the dearsenication rate seems to be limited by intraparticle diffusion of Fe^(3+) iron when the mechanism of indirect oxidation of arsenopyrite during bacterial pretreatment is assumed.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1996年第2期239-243,共5页
CIESC Journal
关键词
动力学
脱砷
细菌氧化
金矿
冶炼
铁硫杆菌
kinetics,dearsenication,bacterial oxidation,arsenical gold ore
