| 英文摘要 |
Lead acid battery is globally highest in production value in all kinds of secondary batteries. They are used in transportation and infrastructure, such as cars, motorcycles, base station, and uninterruptible power supply. With the development of industry, the quantity of lead acid battery in Taiwan is raising from 14000 tons in 1996 to near 70000 tons in 2015. Recycling of lead acid battery is an important issue economically and environmentally. In the first half year of this project, present status of battery recycling technology and the difficulties industry encounter were understood by the visit of domestic battery recycling companies. The information of discussion is used as the reference of research in this project and future development in this field. Sampling of recycling raw material and by-product, such as lead paste, electrode, slag, and dust, were carried out in the factories visit. These samples were analyzed using X-ray diffraction, X-Ray fluorescence, inductively coupled plasma mass spectrometry to identify the material structure and composition, which were also used as the information of research in this project. Factsage is a powerful simulation software used to calculate and predict the reduced reaction of lead paste thermodynamically, especially on the difference of reaction before and after pre-treatment of lead paste. According to the simulation, taguchi experiment was executed to investigate the effect reductant, additive, recipe, and reaction condition on lead recycling rate. The information will also be used as the reference of reduction of lead acid battery and design of refractory material.
Refractory material is one of the critical materials in lead smelting process, which is used to maintain the temperature and lining of furnace. The properties of refractory influence the lifetime, operation temperature, and composition of slag. The operation temperature of lead melting in domestic industry companies is generally lower than typical process, which is mainly caused by the composition and structure of refractory material. In this project, refractory materials are sampled and analyzed as the reference of research, and new refractory materials are developed for the unique operation condition. With the design of refractory composition, powder size distribution, additive composition, pre-shaped, and hot press, the brick are manufactured. After physical, chemical, and mechanical test, refractory material is going to be used in the furnaces of domestic industry companies to increase the operation temperature, lifetime, and reduce the concentration of lead in slag. The purpose of this project is to level up the technology of domestic companies and reduce the impact of waste generated in lead acid battery recycling process to the environment.
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