| Summary: | 碩士 === 崑山科技大學 === 環境工程研究所 === 102 === This study sets can be purified crude zinc oxide, zinc oxide dust recycling resources to enhance the quality of the idea of integration, the overall solution consideration, when trying to resolve issues related to the current set of steel dust recycling crude zinc oxide, existence, hope. The main focus of research technology development, including: crude zinc oxide multi-stage washing cycle, a high concentration of low boiling water evaporation and crystallization, drying after washing zinc oxide. Also better able to promote the recovery of steel dust collector quality zinc oxide, increase economic benefits.
Research moisture crude zinc oxide slag is approximately 0.57 to 0.61%, indicating that the zinc oxide-based rough set are extremely dry dust; After washing the average moisture content of 69.78%, showing crude zinc oxide washed filtration and dewatering, and then the crude oxidation zinc contains high moisture lotion and difficult to remove by filtration dehydration. And washed their total chloride content of about 11.8%. And washing time and parameters for different conditions of liquid to solid ratio of discussion for the optimum effect of source depletion and saves washing time of 5 minutes and the solid-liquid ratio of 1:1.5 is a better test parameters conditions. And concentrate on multi-stage washing cycle test of chlorine concentration had a better upward trend in the first three cycles to an upward trend in the concentration gradually slowed down after the fourth cycle, the chlorine concentration of approximately 100000 mg / L after showing slowing down. Saturated vapor permeable chloride eluent was evaporated reached saturation, so that the washing liquid crystalline phase into the salt, and then the formation of crystals after cooling and separation to be removed, to effect removal and reduction of the salt. And crude zinc oxide residue on drying after washing the optimum drying conditions of 70 ℃ and was disturbed once every 30 minutes.
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