7-2-4 カーボクロリネーションを利用した有価元素の分離回収(7-2 リサイクル,Session 7 環境対策・リサイクル)

概要

論文の詳細を見る
Cerium based abrasive material is widely used for polishing glass materials, such as optical glass and glass circuit board. Spent abrasive material contains rare earth elements ( Ce, La, and Pr) in high content. To recover the valuable elements from the abrasive material, the release behavior of rare earth and coexisting elements ( Fe, Al, and Si ) during heat treatment under chlorine gas stream was investigated. Ce, La, and Pr volatilized simultaneously with Al and Si during chlorination of spent abrasive material at the temperature above 800 ℃. The release temperature of Al and Si decreased by the addition of solid carbon as reducing agent, but this tendency was not observed for the rare earth elements. Ce, La, and Pr were recovered as the residue and the coexisting elements were removed as volatiles by carbochlorination of the spent abrasive material.
2012-07-30