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1. 发明专利

JP2003236564A TREATING METHOD FOR AQUEOUS SOLUTION CONTAINING METAL FLUORIDE 审中-公开
公开(公告)号：JP2003236564A
公开(公告)日：2003-08-26
申请号：JP2002037563
申请日：2002-02-15
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU , FUKUMURA TSUTOMU
IPC分类号： B01D61/44 , B01J49/00 , C02F1/42 , C02F1/469 , C02F1/58 , C02F1/62 , C02F1/64
摘要： PROBLEM TO BE SOLVED: To provide a treating method for an aqueous solution containing a metal fluoride by which an expensive metal contained in waste liquid generated by acid washing is recovered as resources, the amount of industrial wastes is reduced and an agent used for recovering the metal can be reused. SOLUTION: The treating method for the aqueous solution containing the metal fluoride comprises the following steps A to C. (step A) a step for adding ammonium hydroxide and/or ammonia to the aqueous solution; (step B) a step for separating the precipitate generated in the step A and (step C) a step for electrodialysing the aqueous solution separated from the precipitate in the step B. COPYRIGHT: (C)2003,JPO

2. 发明专利

JP2003112215A ROLLING OIL FOR Mg ALLOY SHEET AND METHOD FOR MANUFACTURING Mg ALLOY SHEET 审中-公开
公开(公告)号：JP2003112215A
公开(公告)日：2003-04-15
申请号：JP2001302148
申请日：2001-09-28
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU
IPC分类号： B21B3/00 , B21B1/26 , B21B45/02 , C10M107/50 , C10N40/24
摘要： PROBLEM TO BE SOLVED: To establish technology by which a wide Mg alloy sheet of >=135 mm in width is truly mass-produced by rolling on an industrial scale. SOLUTION: When the Mg alloy sheet is manufactured by performing rolling to a material 1 to be rolled consisting of an Mg alloy, by supplying rolling oil containing at least silicone oil by spraying it from spraying nozzles 7, 7' into the gap between a rolling roll 2 for performing rolling and the material 1 to be rolled through into contact with this rolling roll 2, the wide Mg alloy sheet 1 of >=135 mm in width is manufactured by rolling.

3. 发明专利

JP2002060984A METHOD FOR PRODUCING TITANIUM COLD ROLLED SHEET 失效
公开(公告)号：JP2002060984A
公开(公告)日：2002-02-28
申请号：JP2000248477
申请日：2000-08-18
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU , IWASAKI SHINGO , TAKAHASHI MASANORI
IPC分类号： C22F1/18 , C21D1/76 , C22F1/00 , C22F1/02 , C23G1/10 , C23G1/32
摘要： PROBLEM TO BE SOLVED: To provide a method for producing a titanium sheet hard to be discolored even when used in the environment to be irradiated with light such as the outdoors. SOLUTION: In this method, a titanium sheet in which the content of carbon in a carbon-concentrated layer as the surface layer is controlled to

4. 发明专利

JP2001089884A METHOD FOR RECOVERING AQUEOUS SOLUTION OF NITRIC ACID FROM PICKLING WASTE SOLUTION 失效
公开(公告)号：JP2001089884A
公开(公告)日：2001-04-03
申请号：JP26337499
申请日：1999-09-17
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU
IPC分类号： C23G1/36
摘要： PROBLEM TO BE SOLVED: To provide a method for recovering an aqueous solution of nitric acid of high quality from a pickling waste solution containing nitric acid. SOLUTION: In this method, a pickling waste solution containing nitric acid freed from free acids at need is subjected to neutralizing treatment, the produced precipitates are removed to form into an aqueous solution essentially consisting of calcium nitrate, sulfuric acid is added to the aqueous solution, the produced precipitates of calcium sulfate are removed, and treatment for reducing the concentration of sulfuric ions and/or the concentration of calcium ions contained in the obtained aqueous solution of nitric acid is executed.

5. 发明专利

JP2000265223A METHOD FOR RECOVERING TITANIUM 失效
公开(公告)号：JP2000265223A
公开(公告)日：2000-09-26
申请号：JP7294799
申请日：1999-03-18
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU
IPC分类号： C22B34/12
摘要： PROBLEM TO BE SOLVED: To reduce the amt. of industrial waste caused by waste acid discharging treatment by adding an aq. soln. contg. the fluoride of Ti with one or more kinds among potassium hydroxide, ammonium hydroxide and ammona and precipitating Ti as hydroxide. SOLUTION: The recovery of Ti from a nitric-hydrofluoric acid pickling waste soln. is executed by neutralizing treatment of pH 3 to 12 by potassium hydroxide. At this time, titanium nitrate and titanium tetrafluoride in the waste soln. are brought into reaction with potassium hydroxide to form titanium hydroxide, potassium nitrate and potassium fluoride. Potassium nitrate and potassium fluoride have high solubility and are not precipitated, and the greater part thereof dissolves into the soln. Thus, the precipitation of titanium hydroxide relatively good in purity can be obtd. Since this precipitates have relatively fine particles and are easy to be clogged into a filter cloth, or the like, a suitable coagulant is added thereto before filtration. The soln. in which the precipitates have been filtered away can be reutilized for the pickling of Ti or the like.

6. 发明专利

JP2000144462A METHOD OF SURFACE FINISH FOR HIGH Cr STAINLESS STEEL SHEET 失效
公开(公告)号：JP2000144462A
公开(公告)日：2000-05-26
申请号：JP31815298
申请日：1998-11-09
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU
IPC分类号： C23G1/28
摘要： PROBLEM TO BE SOLVED: To provide a method of surface treatment capable of inexpensively giving excellent antidazzling characteristic to a high chromium stainless steel sheet containing >=19% Cr. SOLUTION: A stainless steel sheet is immersed in a molten alkali salt bath containing nitrate in an amount of 0. 5-8 mass % expressed in terms of sodium nitrate or is immersed in a molten alkali salt bath containing nitrate in an amount of 0.5-40 mass % expressed in terms of sodium nitrate and fluoride in an amount of 1-20 mass % expressed in terms of sodium fluoride, followed by acid pickling.

7. 发明专利

JPH10195684A DESCALING METHOD OF HOT ROLLED STAINLESS STEEL PRODUCTS 失效
公开(公告)号：JPH10195684A
公开(公告)日：1998-07-28
申请号：JP34919796
申请日：1996-12-27
申请人： SUMITOMO METAL IND
发明人： MATSUHASHI TORU , KITANI SHIGERU , TAKEUCHI KOICHI , MATSUMOTO HIROSHI
IPC分类号： B21B45/04 , C23G1/08
摘要： PROBLEM TO BE SOLVED: To descale hot rolled stainless steel products without using sulfuric acid and mixed acids composed of nitric acid and hydrofluoric acid which require anti-pollution measure and are hard to handle by subjecting the stainless steel products having oxide scale on the surfaces after hot rolling to cold rolling of a specific draft. SOLUTION: The scale is removed from the stainless steel products by subjecting the stainless steel products to the cold rolling of the draft of 5 to 40%, then immersing the products into an aq. hydrochloric acid soln. If the draft of the cold rolling is below 5%, the pickling time by the aq. hydrochloric acid soln. is sharply shortened with an increase in the draft but the base metal is deeply melted to a pitting form and this pitting is the cause for the occurrence of laps in the subsequent cold rolling. If, on the other hand, the draft of the cold rolling is >=50%, the amt. that the scale is pushed into the surface of the steel products at the time of the rolling increases and the pushed scale is mainly Cr oxide which is hardly soluble in acids. The removal of the scale is no longer possible unless the pickling time is prolonged. The degraded pickling efficiently is then resulted.

8. 发明专利

JPH09195073A SULFURIC ACID PICKLINK METHOD FOR CHROMIUM BASE STAINLESS STEEL 失效
公开(公告)号：JPH09195073A
公开(公告)日：1997-07-29
申请号：JP1549796
申请日：1996-01-31
申请人： SUMITOMO METAL IND
发明人： MATSUHASHI TORU , KITANI SHIGERU
IPC分类号： C23G1/08 , C23G1/36
摘要： PROBLEM TO BE SOLVED: To recover the descaling capacity of a sulfuric acid pickling soln. and to improve the productivity and the consumption unit of acid by regulating the amt. of Fe ions in an aq. soln. of sulfuric acid in which a Cr base stainless steel is immersed and pickled to specified value by a reducing agent. SOLUTION: A Cr base stainless steel is immersed in an aq. soln. of sulfuric acid and is pickled to remove oxide scales formed on the surface of the steel. At this time, Fe ions in the aq. soln. of sulfuric acid are reduced to Fe ions by a reducing agent to regulate the amt. of the Fe ions in the aq. soln. of sulfuric acid to ions can be executed by subjecting the Fe ions to electrolytic reduction while the aq. soln. of sulfuric acid in a pickling cell is circulated round an electrolytic cell.

9. 发明专利

JPH08158078A PICKLING OF STAINLESS STEEL 失效
公开(公告)号：JPH08158078A
公开(公告)日：1996-06-18
申请号：JP29996494
申请日：1994-12-02
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU , HAYASHI YOSHIO
IPC分类号： C23G1/08
摘要： PURPOSE: To provide a nitric hydrofluoric acid pickling method capable of setting the most suitable pickling condition in response to different kinds of stainless steel different in chemical compositions. CONSTITUTION: In this pickling method of the stainless steel, the steel is pickled so that a value W of the following equation defined by the temp. of the bath, hydrofluoric acid concn. in the bath and pickling time is in a range of -1

10. 发明专利

JPH06146099A METHOD FOR ELIMINATING BUBBLE IN ELECTROLYTIC PICKING AND DEVICE THEREFOR 失效
公开(公告)号：JPH06146099A
公开(公告)日：1994-05-27
申请号：JP4355992
申请日：1992-02-28
申请人： SUMITOMO METAL IND
发明人： KITANI SHIGERU , HAYASHI YOSHIO , KOJIMA TOSHIO , AOKI TATEO
IPC分类号： C25F1/06 , C25F7/00
摘要： PURPOSE:To perform descaling uniformly by providing a suction nozzle at the lower face of a stainless steel strip, and sucking, eliminating, and separating generated bubbles with a washing when the descaling is performed by performing the electrolytic pickling successively while running the stainless steel strip. CONSTITUTION:An annealed stainless steel strip 16, after being socked in fused salt, is electrolyzed in an electrolytic picking solution, and the bubbles of, for example, H2, NO2, etc., are generated on the surface of the strip. At this time, a jet nozzle 30 for electrolytic solution 10 is provided adjacently to the lower face of the strip 16, and the bubbles are separated compulsorily from the strip by blowing the electrolytic solution 10 on the strip 16. Also, the suction nozzle 32 is provided, and the separated bubbles are eliminated by sucking, and the electrolytic solution sucked together with the bubbles is separated by a separator, then, it is re-circulated.

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