发明名称 |
SCORODITE-TYPE IRON-ARSENIC COMPOUND PARTICLES, PRODUCTION METHOD THEREOF, AND ARSENIC-CONTAINING SOLID |
摘要 |
Scorodite-type iron-arsenic compound particles in which the particle surface layer part comprise an iron-rich layer having an Fe/As molar ratio of at least 1.24. The particles can be obtained in a reaction process of feeding an oxygen-containing gas to an aqueous solution containing an arsenic(V) ion and an iron(II) ion to precipitate a scorodite-type iron-arsenic compound crystal at a pH of at most 2, in which an oxidizing agent is further added to the liquid before the end of the reaction (treatment A). The particles may also be obtained by a method comprising keeping a scorodite-type iron-arsenic compound particle of good crystallinity in contact with an iron ion-containing aqueous solution having a controlled pH of from 2 to 9 at 0 to 90° C. (treatment B). The scorodite-type iron-arsenic particles have good filterability and excellent arsenic release-preventing effect.
|
申请公布号 |
US2012045382(A1) |
申请公布日期 |
2012.02.23 |
申请号 |
US201013266141 |
申请日期 |
2010.05.12 |
申请人 |
INOUE KENICHI;OTANI HARUHIRO;HANMA YOSHIHIRO |
发明人 |
INOUE KENICHI;OTANI HARUHIRO;HANMA YOSHIHIRO |
分类号 |
C01G49/02 |
主分类号 |
C01G49/02 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|