The oxygen-ion conductor, the reducing agent, and the molten oxide slag containing electroactive matter were used as constituent of a galvanic cell. Metal was directly electroreduced from molten slag using a short-cir...The oxygen-ion conductor, the reducing agent, and the molten oxide slag containing electroactive matter were used as constituent of a galvanic cell. Metal was directly electroreduced from molten slag using a short-circuit galvanic cell. The following galvanic cell was assembled in the present experiment： graphite rod, [-O]Fe-C saturated ｜ZrO2 （MgO） ｜ Cu（1） ＋ （FeO）（slag） , and molybdenum wire. The FeO electroreduction reaction was studied through measuring short circuit current by controlling factors such as temperature, the FeO content in molten slags, and the external circuit resistance. An overall kinetics model was developed to describe the process of FeO electroreductiono It was found that the modeled curves were in good agreement with the experimental values. The new oxide reduction method in the metallurgy with controlled oxygen flow was proposed and the metallurgical theory with controlled oxygen flow was developed.展开更多
The oxygen-ion-permeable membrane galvanic short-circuit method has been developed, in which pure metal was directly extracted from the molten oxide slag, and no external voltage is applied. The galvanic cell employed...The oxygen-ion-permeable membrane galvanic short-circuit method has been developed, in which pure metal was directly extracted from the molten oxide slag, and no external voltage is applied. The galvanic cell employed in the experiment was as follows: graphite rod|[O]Fe+C saturation|ZrO2(MgO)|(FeO)(slag)|Fe rod. The reduction current in the galvanic cell consisted of an external short-circuit current and an interior short-circuit current in the oxygen-ion-permeable membrane. The real-time variation of external circuit reduction ratio of the molten slag could be obtained from the curve of the external circuit current to the time.展开更多
In this study, the degradation efficiencies of zero-valent iron （ZVI） powders with different structures and components wereevaluated for methyl orange （MO）. The results show that the structure is an essential fact...In this study, the degradation efficiencies of zero-valent iron （ZVI） powders with different structures and components wereevaluated for methyl orange （MO）. The results show that the structure is an essential factor that affects degradation, andadded non-metallic elements help optimize the structure. The amorphous and balled-milled crystalline Fe7oSiloB2o hascomparative degradation efficiencies to MO with tl/2 values of 6.9 and 7.0 min, respectively. Increasing the boron contentcan create a favorable structure and promote degradation. The ball-milled crystalline Fe70B30 and Fe43.64B56.36 powdershave relatively short tl/2 values of 5.2 and 3.3 rain, respectively. The excellent properties are mainly attributed to theirheterogeneous structure with boron-doped active sites in ZVI. Composition segregation in the nanoscale range in anamorphous FeSiB alloy and small boron particles in the microscale range embedded in large iron particles prepared by ball-milling, both constitute effective galvanic cells that promote iron electron loss and therefore decompose organic chemicals.These findings may provide a new, highly efficient, low-cost commercial method for azo dye wastewater treatment usingZVI.展开更多
基金Item Sponsored by National Natural Science Foundation of China (50274008 ,50574011) Provincial Natural Science Foundationof Hubei Province of China (2005ABA019)
文摘The oxygen-ion conductor, the reducing agent, and the molten oxide slag containing electroactive matter were used as constituent of a galvanic cell. Metal was directly electroreduced from molten slag using a short-circuit galvanic cell. The following galvanic cell was assembled in the present experiment： graphite rod, [-O]Fe-C saturated ｜ZrO2 （MgO） ｜ Cu（1） ＋ （FeO）（slag） , and molybdenum wire. The FeO electroreduction reaction was studied through measuring short circuit current by controlling factors such as temperature, the FeO content in molten slags, and the external circuit resistance. An overall kinetics model was developed to describe the process of FeO electroreductiono It was found that the modeled curves were in good agreement with the experimental values. The new oxide reduction method in the metallurgy with controlled oxygen flow was proposed and the metallurgical theory with controlled oxygen flow was developed.
基金This work was financially supported by the National Natural Science Foundation of China (No.59934090) and the National Key Basic Research and Development Program of China (No.G1998061506)
文摘The oxygen-ion-permeable membrane galvanic short-circuit method has been developed, in which pure metal was directly extracted from the molten oxide slag, and no external voltage is applied. The galvanic cell employed in the experiment was as follows: graphite rod|[O]Fe+C saturation|ZrO2(MgO)|(FeO)(slag)|Fe rod. The reduction current in the galvanic cell consisted of an external short-circuit current and an interior short-circuit current in the oxygen-ion-permeable membrane. The real-time variation of external circuit reduction ratio of the molten slag could be obtained from the curve of the external circuit current to the time.
基金supported by the Program of Introducing Innovative Research Team in Dongguan under Contract Number 2014607109Shenzhen Science and Technology Research Grants under Contract Numbers JCYJ20160422104921235,JCYJ20160422143659258 and JCYJ20160422144751573
文摘In this study, the degradation efficiencies of zero-valent iron （ZVI） powders with different structures and components wereevaluated for methyl orange （MO）. The results show that the structure is an essential factor that affects degradation, andadded non-metallic elements help optimize the structure. The amorphous and balled-milled crystalline Fe7oSiloB2o hascomparative degradation efficiencies to MO with tl/2 values of 6.9 and 7.0 min, respectively. Increasing the boron contentcan create a favorable structure and promote degradation. The ball-milled crystalline Fe70B30 and Fe43.64B56.36 powdershave relatively short tl/2 values of 5.2 and 3.3 rain, respectively. The excellent properties are mainly attributed to theirheterogeneous structure with boron-doped active sites in ZVI. Composition segregation in the nanoscale range in anamorphous FeSiB alloy and small boron particles in the microscale range embedded in large iron particles prepared by ball-milling, both constitute effective galvanic cells that promote iron electron loss and therefore decompose organic chemicals.These findings may provide a new, highly efficient, low-cost commercial method for azo dye wastewater treatment usingZVI.
