Japan Atomic Energy Research Institute

Ebara Corporation

Kansai Paint Company, Ltd.

Akio Katakai

Takanobu Sugo

Noriaki Seko

Hiroshi Nagai

Takashi Kawakami

Kunio Fujiwara

Isao Ishigaki

Hiroyuki Nakayama

Keizo Makuuchi

Miyuki Hagiwara

Hideo Kawazu

Jiro Okamoto

Kazuyoshi Takeda

Tohru Takagi

Masaji Akahori

Junichi Kanno

Tsutomu Yamamoto

Satoshi Konishi

Keiji Hasegawa

Shin Hasegawa

Hideyuki Misawa

A collector is disclosed that is made of a polyolefin fiber having amidoxime groups and that is capable of efficient adsorptive recovery of useful metals such as uranium, vanadium, cobalt and titanium which are dissolved in small quantities in seawater. In the presence of a polymerizable monomer having a hydrophilic group, a polymerizable monomer having a cyano group is grafted to a polyolefin fiber by radiation-initiated graft polymerization to form both a hydrophilic group and a cyano group in the same graft side chains, and the cyano groups in the graft side chains are reacted with hydroxylamine to be converted to amidoxime groups, thereby producing a collector capable of recovering dissolved metals from seawater.

Collector for adsorptive recovery of dissolved metal from sea water

An object of the present invention is to provide a structure of a metal collecting material for use in seawater or river water or industrial wastewater to give the most excellent adsorption efficiency. Another object of the present invention is to provide a process for efficiently separating and recovering valuable metals or noxious metals from a metal collecting material having collected said valuable metals from seawater or noxious metals from river water or wastewater with the least possible waste generation. A metal collector according to an aspect of the present invention is formed by stacking at least partially alternate layers of a fibrous metal collecting material with a spacer for introducing a liquid to be treated into said collecting material, wherein the area of spacer side faces represents 25-75% of the total area of collecting material side faces and spacer side faces in the side faces of the stack. A process for eluting and recovering a metal from a metal collecting material according to another aspect of the present invention comprises the steps: (1) contacting the metal collecting material having absorbed a metal with a dilute eluent, (2) contacting the metal collecting material with an eluent more concentrated than in step 1 to recover the metal into the eluent; and (3) contacting a metal resorbing material with the eluate from step 2 to resorb the metal.

Metal-collecting apparatus and method for elution and recovery of metal from metal-collecting material

Collector of metals dissolved in sea water

Collector of dissolved metal from sea water having an amidoxime group and a hydrophilic group, a method for production thereof

A uranium adsorbing material made of a graft polymer with a graft ratio of 20 to 100% which contains amidoxime groups and cation exchange groups in a molar ratio of 1:1 to 20:1 and a process for preparing said material are herein disclosed.

Uranium adsorbing material and process for preparing the same

An emulsion composition for use in baking paint prepared by emulsion polymerization with ionizing radiation of a monomer mixture comprising (1) at least one acrylamide selected from the group consisting of N-methylolacrylamide and N-alkoxymethylacrylamide, (2) a radical polymerizable ethylenic unsaturated monomer having a hydroxyl group, and (3) a radical polymerizable ethylenic unsaturated monomer other than (1) and (2) above.

Emulsion composition for use in baking paint

Growing community of inventors

Gunma-ken, Japan

Akio Katakai