A Study Of The Membrane Electrolysis In Electrolytic Nickel Sulfate

With the development of the society, nickel are more and more applied to every fields ofsociety, while non-ferrous metals refining enterprises such as the cobalt, nickel and copperstill adopt the traditional electrodeposition technology in our country. That high concentrationof high-purity metal electrolyte to the cathodic reduction of ways to make the metal ions inthe electrolyte is reduced at the cathode, thereby obtaining high purity metal. At present, thenickel products of industrial production process containing nickel wastewater discharge oflarge quantity and nickel biodegradability toxicity and difficult to play,easy on theenvironment caused by the heavy metal pollution. With the continuous development of hightechnology in traditional industries, nickel and modern industry invaluable developmentpotential. Due to the continuous increase in demand for nickel, the nickel while higher bid, sowhether it is refined metal electrowinning of nickel, or nickel recycling wastewater, whileprotecting the environment also can bring some economic benefits.Experimental apparatus used in this experiment was laboratory-made, an inorganic glassmaterial is mainly used, and screw pad of silica gel.Experiments determines the electrolyzerparameters, electrolyte composition of every pole compartment whose shape is rectangularand the sizes are as follows: B×L×H=120mm×150mm×100mm.First, the paper analyzes to determine the experimental principle and programs, draw asingle female film better results in theory be used. The first part of the experiment to verifythat a single female film and verify a single male mold basic process advantages. The secondpart of the experiment is to test the nickel electrowinning. For electrolytic nickel sulfatesolution, Experiments using single shade membrane electrolysis method.Using experimentalcontrol of variables were analyzed on an important impact electric fluid concentration,membrane material type, current intensity, electrode materials and other factors, to determinethe optimal process parameters. In this experiment, using a graphite anode material, iridium,tantalum and carbon felt cathode made of stainless steel.Cathode and anode compartmentelectrolyte are respectively nickel sulfate solution and0.1%sulfuric acid solution. In thisstudy, a single film dual-chamber electrolysis, the anode chamber sulfuric acid solution, thecathode chamber nickel sulfate solution, highlighting its advantages when overcast membraneelectrolysis, the anode chamber can be continuously enriched concentrated sulfuric acid,concentrated sulfuric acid can be collected secondary use.The final membrane electrolysisexperiments the optimal process parameters: High concentration of the membrane electrolysis nickel sulfate solution, the temperature20°C, electrolysis current1500mA, voltage8.0V,electrolysis time17h, this condition can be optimal removal53%,70%current efficiency. Atthe same time the cathode plate can have a layer of silver-white metallic nickel plate.Secondly,the preliminary economic analysis of the entire experiment were as this. Singlefilm double sulfate electrowinning process chamber method has excellent economicperformance. Recycling not only metal sulfates, and sulfate ions may be converted to thecorresponding acid can be recovered, and thus a single film electrodeposited double chambermethod has obvious economic advantages.If this electrowinning process used in metalrefining nickel electrowinning can to better quality metal nickel, and concentrated sulfuricacid can be recovered in the sun compartment recycling of concentrated sulfuric acid used inthe production of other processes within the enterprise, reduce costs, to bring some economicbenefits. If the application of this technology to the nickel-metal nickel wastewater recycling,as long as the concentration of nickel ions in wastewater reaches a certain concentration ofnickel can be recycled, reduce environmental pollution while generating economic benefits.Finally, the paper summarizes the whole experiment and technology outlook, greenmembrane electrowinning sulfate electrowinning technology has good prospects fordevelopment.