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抽出クロマト法によるMA回収設備の概念検討

Conceptual study of the equipment for MA recovery by extraction chromatography

倉岡 悦周*; 張 安運*; 熊谷 幹郎*; 澤 俊雄*

Kuraoka, Etsushu*; not registered; Kumagai, Mikio*; not registered

本件では、MA回収プロセスの工学規模試験の可能性について検討するため、小スペース、低コスト化の達成の可能性が評価されている抽出クロマト法に関し、プロセスフロー、設備概要及び概略の設備配置を検討すると共に、CMPO等の廃棄試薬の処理法を調査・検討した。本プロセスの分離工程は2つのCMPO吸着材カラムにより構成され、第1カラムではHLLWからMAと重RE元素及びZr、Moを製品溶液として回収する。第2カラムでは第1カラムの製品溶液からZr、Moを除去すると共に、MAと重REを硝酸酸性の製品溶液として回収する。模擬HLLWを用いた分離試験の結果から、各主要元素の分離性能が確認され、策定したプロセスの妥当性が認められた。なお、本プロセスは"ソルトフリー"であり、Zr-Mo、Pdの分離も可能である等の特徴がある。策定したプロセスについて、プロセスフローダイヤグラムを作成し、工学規模での試験を想定した場合の1試験当たりの物質収支を検討した。分離カラム等の主要機器設備の概念構造、容量を検討し、概略の設備配置図を作成した。作成した機器リストを基に、各設備のコスト評価を実施した。また、本プロセスで発生する廃CMPO吸着材、DTPAやシュウ酸含有廃液に関し、最適な処理法を調査すると共に、フェントン試薬による分解処理試験を実施した。最後に、本プロセスにおける技術的課題について検討した。

In order to study the possibility of a pilot-plant-scale test for MA recovery process by extraction chromatography which has been evaluated to have the potentials of small construction area and low cost, this work investigated the process flow sheet, the configuration and installation layout of equipment. Furthermore, the treatment methods for the organic wastes such as CMPO adsorbent were examined. The proposed process consists of two separation columns packed with CMPO adsorbent, where the 1st one is for the recovery of MA, heavy RE, Zr and Mo from the HLLW and the 2nd one for the removal of the Zr and Mo from the effluent of the 1st column, recovering the MA and the heavy RE as a nitrate acidic solution. The results of the separation experiments using simulated HLLW solutions indicate that the expected separation performance for the main elements was achieved and the proposed process is principally applicable. In addition, the process has the advantages such as "salt-free", the possible recovery of Zr-Mo and Pd from HLLW. The process flow diagram for the proposed separation process was drawn and the mass balance for one test of pilot-plant-scale was evaluated. The structure and size of the main equipment including the separation columns were conceptually designed and the installation layout of the equipment was drawn. The cost of the equipment was preliminary estimated based the specification of the equipment. In addition, the effective treatment methods for the organic wastes including depleted CMPO adsorbent, DTPA or oxalic acid containing waste solution were examined based on article survey. Moreover, some exploratory experiments for the decomposition treatment of these wastes were conducted by using the Fenton reagents. Finally, the subjects remained in this process were extracted.

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