Title:
廃酸石膏の製造方法
Document Type and Number:
Japanese Patent JP5138737
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To produce waste acid gypsum with high purity at low cost.SOLUTION: There is provided a method for producing waste acid gypsum, including the steps of: a waste acid processing step in which sodium hydrosulfide is added to a waste acid containing sulfuric acid formed in copper refining to adjust an oxidation-reduction potential to 20-150 mV(vs. SCE), and sulfurization reaction is performed so that arsenic is removed as sulfide; and a step of producing gypsum by adding alkali to the waste acid in which the sulfide of arsenic is removed, to perform neutralization reaction.
Inventors:
Shinya Sato
Hiroshi Senda
Hidekazu Nakata
Toshihiro Kametani
Hiroshi Senda
Hidekazu Nakata
Toshihiro Kametani
Application Number:
JP2010147674A
Publication Date:
February 06, 2013
Filing Date:
June 29, 2010
Export Citation:
Assignee:
Pan Pacific Copper Co., Ltd.
International Classes:
C01F11/46; C02F1/58; C02F1/62; C22B3/44; C22B7/02; C22B15/00; C22B17/00; C22B19/20; C22B30/04
Domestic Patent References:
| JP2003137545A | ||||
| JP11228134A | ||||
| JP53109898A | ||||
| JP9067118A | ||||
| JP10137768A | ||||
| JP2008200635A | ||||
| JP11047764A |
Attorney, Agent or Firm:
Axis International Patent Business Corporation
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