论文部分内容阅读
A dual cell system with chalcopyrite anode and MnO_2 cathode was used to study the relations between time and such data as the electric quantity and the dissolution rates of the two minerals in the electro-generating leaching(EGL)and the bio-electro-generating leaching(BEGL),respectively.The results showed that the dissolution rates for Cu~(2+)and Fe~(2+)in BEGL were almost 2 times faster than those in EGL,and nearly 3 times for Mn~(2+);the electric output increased nearly by 3 times.The oxidation residue of chalcopyrite was represented by TEM and XRD,whose pattern was similar to that of the raw ore in EGL.The mechanism for leaching of CuFeS_2-MnO_2 in the presence of Acidithiobacillus thiooxidans was proposed as a successive reaction of two independent sub-processes for the anode.The first stage,common to both processes,is dissolution of chalcopyrite to produce Cu~(2+), Fe~(2+)and sulfur.The second stage is subsequent oxidization of sulfur only in BEGL,which is the controlling step of the process. However,the dissolution of MnO_2 lasts until the reaction of chalcopyrite stops or the ores exhaust in two types of leaching.
A dual cell system with chalcopyrite anode and MnO_2 cathode was used to study the relations between time and such data as the electric quantity and the dissolution rates of the two minerals in the electro-generating leaching (EGL) and the bio-electro-generating leaching (BEGL), respectively.The results showed that the dissolution rates for Cu ~ (2+) and Fe ~ (2+) in BEGL were almost 2 times faster than those in EGL, and nearly 3 times for Mn ~ (2+) ; the electric output increased nearly by 3 times. The oxidation residue of chalcopyrite was represented by TEM and XRD, whose pattern was similar to that of the raw ore in EGL. The mechanism for leaching of CuFeS_2-MnO_2 in the presence of Acidithiobacillus thiooxidans was proposed as a successive reaction of two independent sub-processes for the anode. first stage, common to both processes, is dissolution of chalcopyrite to produce Cu ~ (2+), Fe ~ (2+) and sulfur. second stage is subsequent oxidization of sulfur only in BEGL, which is the controlling step of the process. However, the dissolution of MnO_2 lasts until the reaction of chalcopyrite stops or the ores exhaust in two types of leaching.