有色冶金中的离子交换膜电解技术

离子膜电解技术在有色冶金工业中有重要的应用价值 ,膜的选择透过性和不同的电极过程相结合可完成各种冶金过程。综述了离子交换膜电解技术在高纯金属的制备、无机物的电化合成、多价离子氧化状态的控制及金属离子的分离等冶金领域的研究现状 ,分析了该技术的特点 ,并指出了该技术要实现工业化必须解决的主要问题     

Effects of temperature and current density on the surface hardness and tribological properties of Ti-6Al-4V alloy by molten salt carburization

Surface hardening of Ti-6Al-4V alloy was achieved by carburization in a molten salt bath containing BaCO₃ as the carbon-yielding agent with electrolysis within the temperature range 790–930°C. The hardness of the total carburizing layer (TCD) is influenced by the bath temperature, the applied current density and the carburizing period. The major hardening effect is considered to be the formation of a solid solution of carbon in -Ti. The oxide film wrapping at the outermost surface of cathodically charged specimens, identified to be mainly BaTiO₃, was formed irrespective of the bath temperature during the quenching process and has no effect on the surface hardening. The optimal carburizing parameters obtained in this study for surface hardening are carburizing at 930±10°C (bath temperature) and 0.3 A/Cm² (applied current density) for 90 min (carburizing period), while those for tribological properties improvement are carburizing at 860±5°C and 0.3 A/Cm² for 90 min.     

金属材料电解液体磨料冲刷复合抛光工艺

工件在电镀前抛光是一道费工费时的工序，我们利用电解、液体磨料冲刷复合抛光工艺，可及时去除电解过程中在工作表面产生的钝化膜，提高电解抛光质量和速度，降低劳动强度，此工艺特别适用于批量较大、表面形状较复杂的零件的抛光。     

半氧化锰矿制取电解金属锰初探

以中部半氧化矿为原料,进行制取电解金属锰的试验,初步探索其对电解金属锰生产的影响程度,查找引起不正常的原因因素,探索工艺参数,对局部工艺参数调整并指导生产。     

钽包银铂电极应用于管状隔膜新型电解槽

改造双氧水电解生产法的目的是降低电耗。试验证明最有效的方法是改变阳极结构。作者采用钽银复合铂金电极,使电解槽体积及阴阳极极距缩小、槽电压降低、电流浓度提高、槽液流速加快、冷却方式改善,从而使电压下降18.1％,直流电单耗下降22.8％,达到国内最先进的水平,综合经济效益达133.6万元。     

Renewable Power-to-Gas: A technological and economic review

The Power-to-Gas (PtG) process chain could play a significant role in the future energy system. Renewable electric energy can be transformed into storable methane via electrolysis and subsequent methanation.This article compares the available electrolysis and methanation technologies with respect to the stringent requirements of the PtG chain such as low CAPEX, high efficiency, and high flexibility.Three water electrolysis technologies are considered: alkaline electrolysis, PEM electrolysis, and solid oxide electrolysis. Alkaline electrolysis is currently the cheapest technology; however, in the future PEM electrolysis could be better suited for the PtG process chain. Solid oxide electrolysis could also be an option in future, especially if heat sources are available.Several different reactor concepts can be used for the methanation reaction. For catalytic methanation, typically fixed-bed reactors are used; however, novel reactor concepts such as three-phase methanation and micro reactors are currently under development. Another approach is the biochemical conversion. The bioprocess takes place in aqueous solutions and close to ambient temperatures.Finally, the whole process chain is discussed. Critical aspects of the PtG process are the availability of CO₂ sources, the dynamic behaviour of the individual process steps, and especially the economics as well as the efficiency.     

Use of gas bubbles for ultrasound Doppler flow velocity profile measurement

Ultrasonic velocimetry based on the Doppler shift effect accurately provides quasi-instantaneous flow fields for fluids with a sufficiently high acoustic scattering level. However, ultrasonic velocity instruments are known to perform poorly in clear water with low acoustic scattering level, which are frequent conditions in laboratory applications. This work confirms a technique to solve the problem by seeding the flow with micro hydrogen bubbles, generated by means of electrolysis.This paper investigates the influence of gas bubbles density on the quality of the ultrasound Doppler based velocity profiles in an open channel flow. The bubbles are generated by electrolysis of water using different magnitudes of electrical current. The estimation of the number of bubbles in the measurement volume confirms that the bubble diameter is similar to that of the wire used for electrolysis. This enables to determine the minimum density of gas bubbles needed to obtain a reasonably good echo and therefore an accurate velocity profile.     

电解法制取金属铬粉工艺研究

文章分析了电解法制取金属铬的工艺,对其中除铁、冷冻、电解三个工序进行了重点研究,得出了完善工艺流程的办法。     

Long-term tests of a Jülich planar short stack with reversible solid oxide cells in both fuel cell and electrolysis modes

A two-cell planar stack in the Jülich F-design with solid oxide cells has been built and the reversible operation between fuel cell and electrolysis modes has been demonstrated. The cells were anode supported cells (ASC) with yttria-stabilized zirconia (YSZ) electrolytes, Ni/YSZ hydrogen electrodes and perovskite oxygen electrodes with lanthanum strontium cobalt ferrite (LSCF). This paper summarizes and discusses the preliminary experimental results on the long-term aging tests of the reversible solid oxide planar short stack for fuel cell operation (4000 h) at a current density of 0.5 A cm⁻² which shows a degradation of 0.6% per 1000 h and for steam electrolysis operation (3450 h) and co-electrolysis operation of CO₂ and H₂O (640 h) under different current densities from −0.3 to −0.875 A cm⁻² which show different degradation rates depending on current density and on steam or co-electrolysis.     

直流电弧熔炼对渣/金反应的影响

研究交流电弧和200A及320－350A的直流电弧（金属熔池为阳极）熔炼钢液时的渣/金反应。试验结果表明,直流电弧下钢中铬和锰的烧损加剧,比交流电弧下熔炼分别增加约90％和56％。电解引起的铬和锰的烧损量约占总烧损量的一半。电流增大时,碳和锰的烧损增加,但铬的烧损略有降低。