使用済みマンガン乾電池のスクロ-ス添加硫酸浸出

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Environmental problems have recently attracted attention in the world, and there has been an increased demand for the recycling of used materials and products. The dry battery is mainly composed of zinc and manganese, and as Japan is completely without self - sufficiency in manganese, it is desirable that the manganese in used dry batteries can be reused. Manganese in the used dry battery mainly exists as manganese dioxide, which is insoluble. It is known that manganese ore can be leached in sulfuric acid solution with sucrose. Therefore, in this work, as a basis for developing a method of recycling used dry batteries, the process of leaching it in sulfuric acid solution with sucrose was investigated. Zinc in used dry batteries was able to be completely leached, while about thirty percent of manganese was able to be leached in the absence of sucrose. However, with the addition of sucrose the rate of leaching of manganese more than twice. This was the reason why manganese dioxide which was insoluble was reduced by sucrose and leached. To change a pulp density from 30 to 150 g / l, a decrease in leaching percentage of manganese was under ten percent. Used dry batteries were easily leached in the sulfuric acid solution with sucrose, so it was possible to apply this leaching process to recycling of dry batteties. Glucose and fructose, which were formed by the hydrolysis of sucrose, were reactants in the case of leaching manganese dioxide in sulfuric acid solution with sucrose. Each of them was able to leach manganese dioxide. Temperature dependency of the leaching of manganese dioxide in the presence of sucrose, glucose or fructose was studied and as each activation energies of these reactions were found to be, 87.9, 76.6 and 74.9 kJ / mol, respectively.
2000-01-25

使用済みマンガン乾電池のスクロ-ス添加硫酸浸出

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