Title:
METHOD FOR ANALYZING CONCENTRATION OF IRON ION IN ACID WASHING SOLUTION IN STAINLESS STEEL-ACID WASHING PROCESS
Document Type and Number:
Japanese Patent JP3290580
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an analyzing method whereby a concentration of iron ions in an acid washing solution in an acid washing process for stainless steel, especially in an acid washing solution of sulfuric acid and a mixed acid washing solution of fluoric acid and nitric acid can be measured in the same method by an automatic compact analyzing apparatus.
SOLUTION: The analyzing method includes an acid washing process by means of a sulfuric acid aqueous solution and a mixed aqueous solution of fluoric acid and nitric acid. An aqueous solution obtained by adding a hydrogen peroxide solution to a sample of the circulating sulfuric acid aqueous solution in the sulfuric acid washing process, and a sample of the mixed aqueous solution circulating in the mixed acid washing process are analyzed in an iron-salicyclic acid complex absorptiometry.
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Inventors:
Masahiro Yoshioka
Toshiki Isobe
Masahiko Ito
Toshiki Isobe
Masahiko Ito
Application Number:
JP34290895A
Publication Date:
June 10, 2002
Filing Date:
December 28, 1995
Export Citation:
Assignee:
Kawasaki Steel Co., Ltd.
International Classes:
G01N31/00; C23G1/08; C23G3/02; G01N21/77; (IPC1-7): G01N31/00; C23G1/08; C23G3/02; G01N21/77
Domestic Patent References:
| JP7294509A | ||||
| JP5195939A | ||||
| JP5739180A | ||||
| JP2183146A |
Attorney, Agent or Firm:
Eiichi Kobayashi
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