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1. 发明专利

JPH0985264A TREATMENT OF WASTE FLUID CONTAINING CHROMIUM AND CERIUM 失效
公开(公告)号：JPH0985264A
公开(公告)日：1997-03-31
申请号：JP24307095
申请日：1995-09-21
申请人： NIPPON DENKO
发明人： KASHIWAGI RYOICHI , SUZUKI YASUO
IPC分类号： C02F1/42 , B01J47/02 , C02F1/62 , C02F1/70
摘要： PROBLEM TO BE SOLVED: To enable the discharge of chromium and cerium to the outside of a factory or the reutilization thereof by reducing Cr (VI) and Ce (IV) with a reducing agent when a waste fluid containing chromium and cerium in a state of Cr (VI) and Ce (IV) is treated and subsequently performing deionizing treatment by cation and anion exchange resins. SOLUTION: When a waste fluid containing chromium and cerium generated in a photomask etching process in a state of Cr (VI) and Ce (IV) is treated, at first, the effect of Cr (VI) is excluded and, subsequently, Cr, Ce and other ions are adsorbed and removed by an ion exchange resin. That is, after Cr (VI) and Ce (IV) are reduced by a reducing agent, deionizing treatment is performed by cation and anion exchange resins. Pref., after the pH of the waste fluid is adjusted to 1.6-3.0, the reducing agent is added and, as the reducing agent, one kind selected from iron sulfate (II), ammonium iron sulfate (II) and sodium sulfite is used.

2. 发明专利

JPH0824897A TREATMENT OF DRAINAGE CONTAINING HYDROGEN PEROXIDE AND CHROMIUM ION 失效
公开(公告)号：JPH0824897A
公开(公告)日：1996-01-30
申请号：JP16776094
申请日：1994-07-20
申请人： NIPPON DENKO
发明人： KASHIWAGI RYOICHI , HAYAKAWA SATOSHI
IPC分类号： C02F1/42 , C02F1/58 , C02F1/62 , C02F9/00
摘要： PURPOSE:To recover chromium portion from a drainage effectively and make it possible to recycle a treated water by passing drainage containing hydrogen peroxide and chromium ion through a hydrogen peroxide decomposition tower filled with a catalyst, then passing the drainage in which hydrogen peroxide is decomposed through an ion exchange resin tower, and thereby removing chromium ion. CONSTITUTION:Drained water containing hydrogen peroxide and chromium ion generated in a decoloring step is collected into a raw water tank 2 through effluent piping 1, and then is circulated to a hydrogen peroxide decomposition tower 5 filled with granular manganese oxide (IV) using a raw water pump 3. Hydrogen peroxide contained in the drainage is decomposed by a catalytic action of granular manganese oxide, and the concentration of hydrogen peroxide is made to be 100mg/l or less. Next, the drainage is circulated flowing down in ion-exchange resin towers 6, 7, and in this process, chromium ion and other ions are adsorbed and removed. After that, the treated water is collected into a treated water tank 8, then is sent to an original process, using a treated water pump 9 and feed piping 10, and is recycled.

3. 发明专利

JPH0292828A PRODUCTION OF HIGHLY PURE CHROMIUM HYDROXIDE 失效
公开(公告)号：JPH0292828A
公开(公告)日：1990-04-03
申请号：JP24478188
申请日：1988-09-29
申请人： NIPPON DENKO
发明人： KASHIWAGI RYOICHI
IPC分类号： C01G37/02
摘要： PURPOSE:To readily prepare highly pure chromium hydroxide by separating precipitates from a chromium hydroxide slurry using a trivalent chromium salt aqueous solution as a raw material, from a slurry of the precipitates and passing the slurry through an ion exchange resin column. CONSTITUTION:In a method for preparing a highly pure chromium hydroxide from a trivalent chromium salt as a raw material, the following processes are performed. The aqueous solution of the trivalent chromium salt is neutralized with caustic soda or ammonia water and the resultant precipitates are filtered off from the prepared slurry of the chromium hydroxide. The separated precipitated are suspended in water to give a slurry, which is passed through an ion exchange resin column to adsorb water-soluble impurities, thereby providing the objective highly pure chromium hydroxide. The final pH of the reaction for preparing the chromium hydroxide by neutralizing the trivalent chromium salt aqueous solution with the caustic soda or ammonia water is preferably 9.0-11.0, because a too high pH value causes the re-dissolution of the chromium hydroxide with the excess alkali to produce a chromite salt.

4. 发明专利

JPS5935842B2 JPS5935842B2 - 失效
公开(公告)号：JPS5935842B2
公开(公告)日：1984-08-31
申请号：JP7852578
申请日：1978-06-30
申请人： Nippon Denko
发明人： HATSUTORI MINORU , KASHIWAGI RYOICHI
IPC分类号： C22B34/32 , C01G37/00 , C01G37/02 , C22B7/00
CPC分类号： Y02W30/54

5. 发明专利

JPH0824672A METHOD FOR REGENERATING STRONG BASE TYPE ANION EXCHANGE RESIN WITH DICHROMATE ION ABSORBED 失效
公开(公告)号：JPH0824672A
公开(公告)日：1996-01-30
申请号：JP16684594
申请日：1994-07-19
申请人： NIPPON DENKO
发明人： KASHIWAGI RYOICHI
IPC分类号： C01G37/027 , B01J20/26 , B01J49/00
摘要： PURPOSE:To obtain a method for regenerating a strong base type anion exchange resin which elutes promptly and efficiently a dichromate ion absorbed in the resin and can regenerate the resin at a high regeneration rate. CONSTITUTION:An aqueous solution containing a hydroxide ion and a chloride ion is passed through a strong base type anion exchange resin with dichromate ion absorbed to elute a dichromate ion while keeping the pH of the elute at 8 or more. After the elution, an aqueous solution containing a hydroxide ion is passed through the resin to elute a chloride ion absorbed in the resin so as to regenerate the strong base type anion exchange resin.

6. 发明专利

JPH0458415B2 失效
公开(公告)号：JPH0458415B2
公开(公告)日：1992-09-17
申请号：JP24478188
申请日：1988-09-29
申请人： NIPPON DENKO
发明人： KASHIWAGI RYOICHI
IPC分类号： C01G37/02

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