Investigation On The Phase Transformation Of Products Of Zinc And Zinc Oxide In Water Solution Fabricated Via High-energy Ball Mill

As a simple and environment-friendly and low energy-consuming technology, high-energy ball mill, which can produce powder finer in scale and more uniform in distribution has been widely used in fine powder production and research. In this paper, reactants are ball milled in water solution. X-ray diffraction and SEM are employed to analyze the composition and microstructure of the products respectively. The rule of reaction between Zinc and H2O under milling force in conditions of different pH value is explored. The further research has been preliminarily done on the rules of solution of zinc oxide and nickel, cobalt, tungsten, ferrumiron as well as their corresponding oxides respectively.Powder of zinc is ball milled in water solution, pH value of which is adjusted as 3, 7, and 11. According to the theory of thermodynamics and kinetics, reaction accelerates and production of Zinc hydroxide is promoted in alkaline solution in which products are partly Zinc hydroxide and partly zinc oxide with the finest grain. Through the experimental results, neutral solution has the largest amount of zinc oxide, which transfers into and makes balance with Zinc hydroxide. Compared with neutral and alkaline solution, acid solution is favorable for the growth of Zinc hydroxide almost without the appearance of Zinc oxide. By SEM it is found that all products generated are nanometer.As to zinc oxide-nickel, zinc oxide-cobalt, zinc oxide- tungsten and zinc oxide- ferrumiron systems, there is no substitution reaction for zinc with the exception of the reactants, nothing new was generated. In zinc oxide-nickel system, the diffraction peaks of nickel and zinc oxide are both widening with ball milling continues, due to finer dimension of the powders. In zinc oxide-cobalt system, cobalt hydroxides are formed. Advert to zinc oxide-ferrum system, diffraction peaks of ferrum and zinc oxide are both widened.According to the results, zinc oxide is likely to be piled into nickel oxide mostly after 58h milling and escapes afterwards which indicates that the solution between the two are in dynamic imbalance. For that of zinc oxide and cobalt oxide, the diffraction peaks of zinc oxide disappear after 80h milling with the widening of that of cobalt oxide, which also show the possible solution of zinc oxide into cobalt oxide. In terms of zinc oxide and tungsten trioxide, peaks of the products after 80h milling look like amorphous, of which the real cause deserves further study. Ball milled with zinc oxide for 80h, ferric oxide turns to be zinc ferrite, which increases as milling operates, and 200h later, zinc oxide disappear entirely. All these indicate that zinc oxide partly entered the lattice of ferric oxide while partly react with ferric oxide and transfer into zinc ferrite.