| dc.description.abstract | Abstract
There is lack of natural resources and mineral resources, especially scarce metal in our country. With the growth of economic development, Taiwan has increased the consumption of metal gradually in these decades, and has to rely on import of these kinds of resources in order to obtain the necessary support of metal for economic development.
The current industrial copper dust is curing or chemical treatment. Therefore, to satisfy with both government policy development and needs of economic development, this study gathers dust resources into product reuse, and explores the different experiments operating parameters, seeking for the optimum operation conditions.
The results show that zinc content of the flue dust collected in this study has an average of 57.25 percent, an average of 5.38 percent copper content. The raw materials evaluates best ratio in the flue dust: Sulfuric acid: water as 1:2:3, 30N sulfuric acid concentration 150rpm for the speed when evaluating stirring, 180 minutes for the solvent extraction time, and 40 ℃ are the best solvent extraction conditions. Vacuum concentration crystallization is the best that bring together all the advantages and this method has advantages of short crystallization time and less energy consumption.
In SEM-EDS analysis, it show that the elements of its composition under different conditions are zinc, oxygen, sulfur. All samples were analyzed by XRD and the result show that they are prepared as zinc sulfate monohydrate. After TEM and BET characterization, it is confirmed as a perfect crystal grain in good shape. Economic analysis of calculating the return on investment estimates the recyclable life of adding this production line is 1.45 years. The study is currently not applicable to the real field, because it still relies on many undergoing follow-up studies.
Keyword：industrial copper dust collection、chemical eluviation、Crystallization、Zinc Sulfate、Economic Benefit Analysis
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