Effect of electrolyte characteristics on electrowinning of copper powder

This paper is concerned with studying the effect of electrolyte characteristics on the production process of electrolytic copper powder from partially depleted Cu containing synthetic electrolytes by electrowinning technique. The main electrolyte characteristics are temperature, circulation rate, Cu and H₂SO₄ concentrations, residence time in the cell, and utilization of organic bath additives. The process is positively affected by increasing the values of all of the studied parameters except for the addition of organic bath additives, which causes a negative effect. However addition of organic bath additives remarkably increases the degree of refinement of the produced powders. In most cases pure and fine copper powders were obtained with a dendritic shape, as indicated by scanning electron microscope (SEM) analysis.     

锌-空气电池废锌阳极板再生的工艺研究

废锌极板经连续循环浸出-电积锌粉-制作锌阳极板的工艺是可行的。其条件为:浸出介质为氢氧化钾溶液、浓度6~8 mol/L、电解电流密度1 800~2 000 A/m2,保持溶液中Zn2+浓度20~25 g/L,电解温度35℃,刮锌粉间隔时间1~2 h。所得锌粉放电活性较好,适合作为锌-空气电池用。     

提高堆浸厂电积铜质量的生产实践

结合现场实际情况以及作者的工作实践,分析了生产中影响电积铜质量的主要原因,提出了提高电积铜质量的有效途径。     

Electrowinning of iron from sulphate solutions

During a 10 years period from 1947 to 1957, a research group at the smelter owned by Orkla Grube-Aktiebolag at Thamshavn, Norway, developed the so-called Pyror Process, the aim of which was to take care of all the valuable components in the copper-bearing pyrite ore being produced at the nearby Lökken mine. The present paper describes pilot plant operation of the crucial step of this process, which is electrowinning of iron from a sulphuric acid solution, using iron starting sheets and lead anodes surrounded by a diaphragm. High purity iron was produced, with a current yield of 85% and a power consumption of 4.25 kWh/kg iron.     

水分分析方法及连续重整装置中循环氢的水分在线分析

本文全面介绍了各种水分分析的方法,对循环氢水分的现行分析方法进行了总结,并着重阐述了循环氢水分的电解法分析及其应用。     

有色金属水溶液电解过程的电能节约

降低电解过程的电能消耗具有巨大的经济意义。本文对近年来电解精炼和电解提取中节电技术进展及研究结果进行了简要述评。     

紫金山铜矿万吨级湿法炼铜厂的设计

介绍了福建紫金山铜矿万吨级湿法炼铜厂建设的项目背景及湿法炼铜厂的设计情况,探讨了工厂设计及运行存在的问题和解决方法。     

铜锌混合矿选冶新工艺研究

针对某难分选的铜锌矿石,提出一种混合浮选—氧化焙烧—选择性浸出—铜、锌电积选冶联合新工艺。先后完成了试验室、扩大规模和半工业试验研究,取得了较为满意的结果。新工艺简化了选矿流程,混合浮选的铜、锌选矿总回收率比原分选工艺分别提高了2 4%和44 8%;从混合精矿到产出一号电铜和电锌,铜、锌回收率均达92 5%以上,镉、钴、银等有价金属可进一步回收利用;而且铜锌电积或铜萃取产生的酸可全部返回使用。     

Process flowsheet development for recovering antimony from Sb-bearing copper concentrates

The technical feasibility, on laboratory scale, of hydro- and electrometallurgical processes of recovering metallic antimony from an antimony-bearing copper sulphide concentrate has been investigated. The influence of Na₂S concentration, temperature and solid concentration was studied during the leaching test while the effect of current density, Na₂S concentration, electrolyte temperature and NaOH concentration on antimony electrowinning from alkaline sulphide solutions was investigated. The leaching results showed that antimony dissolution is strongly dependent on the concentration of the leaching reagent as well as the leaching temperature. The antimony content in the concentrate was reduced from 1.7% to less than 0.1% Sb which is desirable for copper metallurgy. Cathode current efficiency is one of the important parameters to evaluate the performance of an electrolytic process. It is revealed in this study that current efficiency of antimony deposition from sulphide electrolytes is highly dependent on the concentration of sodium hydroxide and the current density used. The results illustrate that the combined effect of increasing anode current density (which was 10 times higher than the cathode current density) and NaOH concentration enhanced the current efficiency of the electrolytic process. It was demonstrated that excess free sulphide ions impacts the current efficiency of the process detrimentally. An integrated hydro-/electrometallurgical process flowsheet for antimony removal and recovery from a sulphide copper concentrate was developed.     

湿法炼锌中电解过程添加剂的选择

锌电解过程向电解液内添加的药品种类很多，其作用互相制约互相联系，它们配合的最佳化是电解操作的重要条件。对这些添加剂的种类、用途、作用机理等做较深入的探讨显得尤为必要。