<報文>タンタルコンデンサスクラップの塩化処理 : レアメタルのリサイクルに関する研究 (IX)

概要

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Since rare metals have many advantages in high advanced technology fields, a stable supply of these metals is very important in a highly industrialized country like Japan. Developing an urban mine in which these metals are condensed is a possible solution to this problem. In this report, we discuss the recycling of tantalum from capacitor scrap via a chloride process. The results are as follows : 1) Capacitor scraps reacted with Cl_2 gas at about 623K producing TaCl_5,while Ta_2O_5 and MnO_2 did not react with Cl_2 and remained as residues. 2) Mn content in recovered TaCl_5 was decreased to 0.007%, but that in the residue was enriched to 13.2%. 3) In the case of capacitor chlorination, a low reaction rate of 55% was obtained. Some pretreatment like crushing must be considered. 4) Chlorination of ground capacitor scrap powder after reductive leaching gave a high reaction rate of 95% and a low Mn content in TaCl_5 of less than 1ppm. 5) The probable process for recycling of Ta capacitor scrap corresponding to advanced material production was proposed based on the above results.tantalumrecyclingcapacitorscrapchlorinationrare metal
東北大学の論文
1991-03-29