Ebara Corporation

Titan Kogyo Kabushiki Kaisha

Tosoh Corporation

Nippon Chemical Industrial Co., Ltd.

Clariant Catalysts (Japan) K.k.

Nihon Kaisu Co., Ltd.

Nihon Kaisui Co., Ltd.

Takashi Sakuma

Makoto Komatsu

Takeshi Izumi

Hidenori Ishioka

Takafumi Tanaka

Takeshi Sakamoto

Shigeru Hirano

Masahiro Kikuchi

Nobuyuki Hashimoto

Keisuke Tokunaga

Shinsuke Miyabe

Tomoko Yoshimi

Kaori Sugihara

Ayaka Ando

Yutaka Kinose

Hajime Funakoshi

Toshimasa Seki

Yoju Shimizu

Tomohiko Ito

Hyun-Joong Kim

Takayasu Tanaka

Tadahito Nakashima

Hiroaki Uchida

Shigeru Nagaoka

Mari Tokutake

Kiyoshi Satou

Toru Shibuya

Kenta Kozasu

Eiji Noguchi

Provided are a cobalt ion adsorption material which has a large adsorption capacity and which tends not to generate fine powder, and a method for producing the same. This cobalt ion adsorption material is a powder with a particle diameter of 100-1,000 μm, and contains 0.3-8.0 parts by mass of a binder constituted of a water-insoluble metal oxide or metal hydroxide fine particles with respect to 100 parts by mass of a cobalt adsorption main agent constituted of potassium hydrogen dititanate hydrate.

Cobalt ion adsorption material and method for producing same

The present invention provides a particulate cobalt ion adsorbent which has a high adsorption capacity. A particulate cobalt ion adsorbent which contains potassium hydrogen dititanate hydrate represented by chemical formula KHO.2TiO.nHO (wherein x is 0.5 or more and 1.3 or less, and n is greater than 0), and no binder, wherein the particulate cobalt ion adsorbent has a particle size range of 150 μm or more and 1000 μm or less.

Cobalt ion adsorbent, method for producing same and treatment apparatus for cobalt ion-containing liquid

The present invention provides a composition that includes a silicotitanate that has a sitinakite structure, the composition having higher cesium adsorptivity than conventional compositions. The present invention also provides a production method for the composition that includes a silicotitanate that has a sitinakite structure. The production method does not require the use of hazardous or deleterious materials, can generate a product using a compound that is easily acquired, and can use a general-purpose autoclave. Also provided is a silicotitanate composition that has higher strontium adsorptivity than the present invention. Provided is a silicotitanate composition that contains niobium and a silicotitanate that has a sitinakite structure, the composition having at least two or more diffraction peaks selected from the group consisting of 2&#x3b8;=8.8&#xb0;&#xb1;0.5&#xb0;, 2&#x3b8;=10.0&#xb0;&#xb1;0.5&#xb0;, and 2&#x3b8;=29.6&#xb0;&#xb1;0.5&#xb0;.

Adsorption method for at least one of cesium and strontium employing silicotitanate having sitinakite structure

Provided is a particulate alkaline earth metal ion adsorbent having a large adsorption capacity. The particulate alkaline earth metal ion adsorbent comprising: a potassium hydrogen dititanate hydrate represented by a chemical formula KHO&#xb7;2TiO&#xb7;nHO, wherein x is 0.5 or more and 1.3 or less, and n is greater than 0; and no binder, wherein the particulate alkaline earth metal ion adsorbent has a particle size range of 150 &#x3bc;m or more and 1000 &#x3bc;m or less.

Alkaline earth metal ion adsorbent, and production method of the same, and alkaline earth metal ion-containing liquid treatment apparatus

Provided are a silicotitanate molded body having high strength and reduced generation of fine powder, a production method thereof, an adsorbent comprising the silicotitanate molded body, and a decontamination method of radioactive cesium and/or radioactive strontium by using the adsorbent. The silicotitanate molded body comprises: crystalline silicotitanate particles that have a particle size distribution in which 90% or more, on volume basis, of the particles have a particle size within a range of 1 &#x3bc;m or more and 10 &#x3bc;m or less and that are represented by a general formula of ATiO(SiO).nHO wherein A represents one or two alkali metal elements selected from Na and K, and n represents a number of 0 to 2; and an oxide of one or more elements selected from the group consisting of aluminum, zirconium, iron, and cerium.

Silicotitanate molded body, production method thereof, adsorbent for cesium and/or strontium comprising silicotitanate molded body, and decontamination method for radioactive waste solution by using adsorbent

An adsorbent capable of adsorbing radioactive antimony, radioactive iodine and radioactive ruthenium, the adsorbent containing cerium(IV) hydroxide in a particle or granular form having a particle size of 250 &#x3bc;m or more and 1200 &#x3bc;m or less; and a treatment method of radioactive waste water containing radioactive antimony, radioactive iodine and radioactive ruthenium, the treatment method comprising passing the radioactive waste water containing radioactive antimony, radioactive iodine and radioactive ruthenium through an adsorption column packed with the adsorbent, to adsorb the radioactive antimony, radioactive iodine and radioactive ruthenium on the adsorbent, wherein the absorbent is packed to a height of 10 cm or more and 300 cm or less of the adsorption column, and wherein the radioactive waste water is passed through the adsorption column at a linear velocity (LV) of 1 m/h or more and 40 m/h or less and a space velocity (SV) of 200 hor less.

Adsorbent for radioactive antimony, radioactive iodine and radioactive ruthenium, and treatment method of radioactive waste water using the adsorbent

The present invention provides a treatment method of a radioactive iodine-containing fluid, comprising passing the radioactive iodine-containing fluid through an adsorbent for iodine consisting of a silver-containing binderless zeolite molded body having a silver content of 50 mass % or less, to adsorb the radioactive iodine on the adsorbent for iodine.

Treatment method of radioactive iodine-containing fluid

An adsorbent is provided to adsorb ruthenium from aqueous solution for recovery and/or reuse or removal of said ruthenium, and a method for purifying, for example, sea water and/or water containing sodium ions, magnesium ions, calcium ions, chlorine ions or other ions, polluted with a radioactive element, using said adsorbent. The ruthenium adsorbent includes manganese in the form of oxides thereof. The adsorbent can further include at least one additional transition metal element other than manganese, such as copper. The adsorbent soaked in water removes radioactive ruthenium or the like through adsorption, and thereby can purify, for example, sea water and/or water containing sodium ions, magnesium ions, calcium ions, chlorine ions or other ions.

Agent for adsorption of ruthenium from aqueous solution and method for adsorption of ruthenium from aqueous solution

Provided are an adsorbent capable of removing radioactive water liquid including iodine compounds and/or antimony by means of a water passing treatment, and a method and an apparatus for treating radioactive waste liquid by using the adsorbent. The adsorbent includes a polymer resin and 10 parts by weight or more of a hydrous hydroxide of a rare earth element based on 100 parts by weight of the polymer resin, in which the hydrous hydroxide of the rare earth element has a water content of 1 part by weight to 30 parts by weight based on 100 parts by weight of a dry product thereof, and adsorbs iodine compounds and/or antimony.

Adsorbent for adsorbing iodine compounds and/or antimony, method for preparing said adsorbent, and method and apparatus for treating radioactive waste liquid by using said absorbent

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Tokyo, Japan

Takashi Sakuma