Title:
METHOD FOR PRODUCING WASTE ACID GYPSUM
Document Type and Number:
Japanese Patent JP2012012230
Kind Code:
A
Abstract:
To produce waste acid gypsum with high purity at low cost.
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.
More Like This:
Inventors:
SATO SHINYA
SENDA YASUSHI
NAKADA HIDEKAZU
KAMETANI TOSHIHIRO
SENDA YASUSHI
NAKADA HIDEKAZU
KAMETANI TOSHIHIRO
Application Number:
JP2010147674A
Publication Date:
January 19, 2012
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 | 2003-05-14 | |||
| JPH11228134A | 1999-08-24 | |||
| JPS53109898A | 1978-09-26 | |||
| JPH0967118A | 1997-03-11 | |||
| JPH10137768A | 1998-05-26 | |||
| JP2008200635A | 2008-09-04 | |||
| JPH1147764A | 1999-02-23 | |||
| JP2003137545A | 2003-05-14 | |||
| JPH11228134A | 1999-08-24 | |||
| JPS53109898A | 1978-09-26 | |||
| JPH0967118A | 1997-03-11 | |||
| JPH10137768A | 1998-05-26 | |||
| JP2008200635A | 2008-09-04 | |||
| JPH1147764A | 1999-02-23 |
Attorney, Agent or Firm:
Axis International Patent Business Corporation