Mitsubishi Chemical Industries Limited

Kasei Optonix, Ltd.

Nippon Light Metal Company, Ltd.

Yukinori Minagawa

Kunihiko Yamaguchi

Minoru Tanaka

Tsugio Kaneko

Etsuo Shimizu

Toshihiko Yoshitomi

Masachika Yaguchi

Gouichi Muramatsu

Kazumasa Arai

Fumikazu Yajima

Keiko Matsuo

A method for recovering gallium, which comprises a capturing step of contacting an aqueous solution containing gallium to a chelating agent containing a water-insoluble substituted quinolinol as the active ingredient, to let the chelating agent capture gallium, and an eluting step of contacting an eluting solution composed of an aqueous solution of an acid or strong base containing said substituted quinolinol, to the chelating agent from the capturing step, to elute gallium therefrom.

Method for recovering gallium

A rare earth phosphor comprising a rare earth oxyhalide phosphor body and cinnamic acid which may have a hydrophobic substituent and which is adhered to or brought in contact with the phosphor body.

Rare earth phosphor and radiographic image conversion screen

A process for preparing a rare earth oxide type phosphor comprises compressing a starting mixture composed essentially of a matrix material for said rare earth oxide type phosphor, an activator material and a flux under a presssure of from 250 to 1500 kg/cm.sup.2 to form a compact, and firing and unbinding the compact thereby obtained.

Process for preparing a phosphor

Yttrium ions are selectively separated by extracting the yttrium ions by contacting an aqueous solution containing hydroxyethyl ethylenediaminetriacetic acid, yttrium ions and lanthanide ions with an extracting solvent containing tributyl phosphate and an acid phosphoric ester having the formula ##STR1## wherein R.sup.1 represents hydrogen atom or an alkyl group having the formula ##STR2## wherein n is an integer of 6 to 15 and m is n-1 or n-2; and R.sup.2 represents an alkyl group having the formula ##STR3## wherein n is an integer of 6 to 15 and m is n-1 or n-2.

Method of separating yttrium ions

Yttrium ions are selectively extracted by contacting an acid phosphoric ester with an aqueous solution containing diethylenetriaminepentaacetic acid and yttrium ions and one or more heavy rare earth (atomic number of 64 to 71) ions.

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Ebina, Japan

Yukinori Minagawa