Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
METHOD OF TREATING DIARSENIC TRIOXIDE
Document Type and Number:
Japanese Patent JP2009242223
Kind Code:
A
Abstract:

To provide a method that, in the treatment of arsenic existing in the form of diarsenic trioxide, satisfies the elution standards (according to Notification No.13 from the Environment Agency), ensures excellence in filtration and can form stable scorodite readily with high reproducibility without any complex operation.

Diarsenic trioxide is treated by a treatment method comprising a leaching step of adding water to diarsenic trioxide into slurry, warming the slurry and leaching out arsenic while adding an oxidizing agent to thereby obtain a leachate; a deoxidizing step of removing any oxidizing agent remaining in the leachate to thereby obtain a preparation liquid; and a crystallization step of converting the arsenic in the preparation liquid to a scorodite crystal.


Inventors:
ABUMIYA MITSUO
SATO YUSUKE
MIKAMI HIRONOBU
OUCHI MASAMI
FUJITA TETSUO
MATSUMOTO MASAYOSHI
Application Number:
JP2008180310A
Publication Date:
October 22, 2009
Filing Date:
July 10, 2008
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
DOWA METALS & MINING CO LTD
International Classes:
C01G49/00; B01D9/02
Domestic Patent References:
JPS4838057B11973-11-15
JPS54160590A1979-12-19
JPS58204826A1983-11-29
JPH06206080A1994-07-26
JPH09241776A1997-09-16
JPH09315819A1997-12-09
JP2000219920A2000-08-08
JP2005161123A2005-06-23
JP2008081784A2008-04-10
JP2009242221A2009-10-22
JP2009242222A2009-10-22
JP2009242224A2009-10-22
JP2009242935A2009-10-22
Foreign References:
WO2000078402A12000-12-28
WO2006117424A12006-11-09
Attorney, Agent or Firm:
Aniya Setsuo
Hitoshi Kiyono



 
Previous Patent: METHOD OF TREATING COPPER-ARSENIC COMPOUND

Next Patent: TIN-DOPED INDIUM OXIDE PARTICLES AND THEIR MANUFACTURING METHOD