Preparation Of Zinc Oxide Research From The Oxidation Of Zinc

A novel technology of preparation for nanometer-sized zinc oxide from zinc-oxide ore has been investigated and developed in this paper. The wholly technological process of preparation for nanometer-sized zinc oxide from zinc-oxide ore has been completed systematically. Pilot experiments of removal water of basic zinc carbonate and cacilnation under microwave irradiation heating have been carried out.Some main results of testing research were as follows:i.Experiments for leaching of zinc oxide ore with sulfuric acid were conducted systematically. The effects on the leaching rate of zinc were analyzed, the optimum conditions determined of leaching of zinc-oxide ore were as follows: liquid-solid ratio 5:1, stirring ratio 200r/min, particle size -120+160 mesh, the time of leaching 4.0h. the concentration of sulfuric acid 25%. The rate of leaching zinc is above 92.0% under above leaching conditions. ii. Research on the iron-removal in zinc sulfate leaching solution with the goethite process and oxidation- hydrolysis process was performed. The effects on the iron-removal rate of zinc sulfate solution was analyzed and discussed in detail. The optimum conditions of iron-removal were obtained as follows: the time of reaction 1.5h. temperature of reaction 90-92 ℃ , pH 5.2-5.4, the quantity of hydrogen superoxide above the quantity of theory counting 1.8 times and additive time of hydrogen superoxide 45min. Under these conditions, the iron-removal rate of zinc sulfate leaching solution reaches better effect. Moreover, the optimum purification conditions of lead-removal, cadmium-removal and cobalt-removal were obtained as follows: reaction temperature 70~80℃, pH 5.2-5.4, reaction time 1 - 1.5h. the quantity of zinc power above the quantity of theory counting 2.8 times.iii.Preparation for precursor of nanometer-sized basic zinc carbonate under the condition of ultrasonic irradiation was introduced, and a mechanism on preparation for precursor of nanometer-sized basic zinc carbonate with ultrasonic irradiation has been investigated emphatically as well as the effects on quality of precursor of basic zinccarbonate have been analyzed and discussed in detail. The optimum conditions obtained of preparation were as follows: the concentration of zinc sulfate solution 1.8~2.0mol/L. the concentration of ammonium bicarbonate solution 1.4-~1.6mol/L, the time of ultrasonic irradiation 23~28min.iv. Preparation for nanometer-sized zinc oxide of calcining precursor of basic zinc carbonate by microwave irradiation was adopted, and a preparation mechanism of ultra-fine nanometer-sized zinc oxide by microwave irradiation has been investigated emphatically as well as the effects on quality of nanometer-sized zinc oxide have been analyzed and discussed in detail. 8-15 min of the calcination time under microwave irradiation was determined.v.The microstructure, granularity and morphology of the product nanometer-sized zinc oxide were characterized by EPMA-1600. The analyzed results of EPMA-1600 showed that the nanometer-sized zinc oxide was spherical structure, distribution of particle was even, granules was uniform, average size was lOOnm and specific surface was 58.723m2/g. The direct recovery rate of zinc of the whole flow was above 91%.vi.Pilot experiments of removal water of basic zinc carbonate and cacilnation by, microwave heating have been performed.In a word, a saving-energy high efficient comprehensive environmental-friendly new-style process of preparation of ultra-fine power has been developed. Therefore, the research of this experiment was innovative scientifically as well as the research of this experiment was of importance in the practical research value of application. In particular, this method of research was of significance in research in devclopping zinc product with high value for our country being rich in resource of zinc.