Continuous liquid-liquid extraction of nickel from simulated electroless nickel plating liquid wastes by using a counter current emulsion flow extractor

向流式エマルションフロー抽出装置を用いた無電解ニッケルメッキ廃液からのニッケルの連続抽出に関する研究

永野 哲志  ; 三田村 久吉; 山下 祐司; 柳瀬 信之; 鈴木 英哉; 長縄 弘親  

Nagano, Tetsushi; Mitamura, Hisayoshi; Yamashita, Yuji; Yanase, Nobuyuki; Suzuki, Hideya; Naganawa, Hirochika

無電解ニッケル廃液からニッケルを連続的に抽出するために、エマルションフロー抽出装置を利用した廃液処理システムを開発した。抽出溶媒としてはニッケルの抽出剤であるLIX-84Iと反応加速剤であるPC88Aを溶解させたシェルゾールD70を使用した。純水で希釈した模擬廃液に本抽出システムを適用したところ、最大で96%のニッケルを抽出することがわかった。また、エマルションの液滴のサイズを高速度カメラで分析したところ、0.20.4mmであった。

Simulated electroless nickel plating liquid wastes have been processed by using an emulsion flow extractor of a counter current type with a special focus on influences of dilution of the liquid wastes on the extraction performance. The emulsion flow extractor provides an efficient liquid-liquid extraction by sending solutions without additional stirring or shaking. A solvent used in the present study was Shellsol D70 solution containing LIX84-I as an extractant for nickel and PC88A as an accelerating agent. As a result, it was found that increasing degree of dilution with water resulted in improvement of nickel extractabilities obtained from the emulsion flow experiments with a maximum value of 96% as well as those obtained from batch experiments. Droplet sizes at the lower and the upper sides of emulsion phases, estimated by using high-speed microscope, were 214 36 m and 415 110 m, respectively.