Study On Fractal Growth And Regulation In Metallic Iron Electrodeposition

The resource utilization of titanium white by-product ferrous sulfate is one of the key issues to be solved urgently in the titanium dioxide industry.According to statistics,China produces about 3 million tons of titanium sulphate sulphate per year,which has a huge amount of storage,which has caused serious waste of resources and added huge environmental protection shackles for the healthy development of the titanium dioxide industry.Therefore,the exploration of resource recovery methods for ferrous sulfate and the establishment of iron migration rules and regulation laws are significant ways to achieve green sustainable development of China's titanium dioxide industry.From the perspective of electric field enhancement,this thesis proposes that the electrolytic iron can be obtained by purifying the titanium white by-product and then performing wet electrolysis,which will provide a new method for the resource utilization of titanium white by-product.Wet electrodeposition is an important method for preparing metal materials.The introduction of fractal geometry provides a new way to quantify the fractal growth behavior of dendrites in metal electrodeposition..In this thesis,the fractal growth behavior of dendrites is the control target in the process of metallic iron electrodeposition.The fractal growth process of iron dendrites are quantified by fractal dimension.The influence of electrodeposition conditions on the morphology of iron dendrites under electric field conditions are mainly investigated.two-dimensional and three-dimensional growth regulation modes for forming iron dendrites.At the same time,this thesis also uses matlab simulation to study the dendritic growth mechanism during electrodeposition of point electrodes.Finally,3D-Fe/Ni and 3D-Fe/Zn dendrites of composite metals were prepared by controlling the fractal growth morphology of 3D-Fe dendrites with metal ions.?1?Based on the platform of point electrode electrodeposition device,the effects of electrolyte concentration,growth voltage,growth time and initial pH on the morphology and fractal dimension of 2D-Fe electrodeposited products were systematically investigated,and 1D-Fe fractal dendrites were prepared.?2?Matalab simulation was used to investigate the effects of particle movement velocity,number of released particles and probability of binding between particles on the morphology and fractal dimension of particle clusters in the process of electrodeposition of point electrodes,and a comparative study was carried out with the experimental results of electrodeposition.?3?In the preparation of three-dimensional iron dendrite,a ring-shaped full-immersion electrodeposition device was used.The effects of electrolyte concentration,growth voltage,growth time,initial pH and additives on the morphology of three-dimensional iron dendrite were investigated.The surface area and fractal dimension of 3D-Fe dendrites prepared under the above conditions were characterized,and the fractal growth conditions of 3D-Fe dendrites were optimized.?4?In the process of investigating the effect of metal ions on the morphology of iron dendrite,the influence of nickel and zinc ions on the morphology of iron dendrite was studied by adding different concentrations of nickel sulfate and zinc sulfate to the original electrolyte.It was found that bimetallic 3D-Fe/Ni dendrites and 3D-Fe/Zn dendrites could be successfully prepared when nickel ion concentration was 120 g/L,zinc ion concentration was 50 g/L and growth voltage was 5 v.According to BET analysis of Fe/Ni dendrites and Fe/Zn dendrites,the specific surface areas of Fe/Ni dendrites and Fe/Zn dendrites are 16.95 m²/g and 10.93 m²/g,respectively,which are larger than the specific surface areas of iron dendrites without adding Ni²⁺,Zn²⁺?10.23m²/g?under the same conditions.