Title:
METHOD FOR TREATING WASTE HYDROFLUORIC ACID
Document Type and Number:
Japanese Patent JP2010234205
Kind Code:
A
Abstract:
To efficiently treat waste hydrofluoric acid while restraining generation of sludge and reducing the treating time.
This method is a method for treating waste liquid including hydrofluoric acid and includes: the process 1 of adding unslaked lime (CaO) or slaked lime (Ca(OH)2) to fluorine contained in waste liquid directly or by slurrying for calcium fluoride in equivalents of 1.0-1.5 in terms of amount of calcium; the process 2 of adding caustic soda until pH of a mixture obtained by the process 1 becomes at least 5 to produce slurry including calcium fluoride; and the process 3 of separating the slurry subsequently to the process 2.
Inventors:
YAMAGUCHI YOSUKE
SAKAGUCHI MITSUGI
MORIAKI HIDEYUKI
SAKAGUCHI MITSUGI
MORIAKI HIDEYUKI
Application Number:
JP2009083185A
Publication Date:
October 21, 2010
Filing Date:
March 30, 2009
Export Citation:
Assignee:
NIPPON MINING CO
International Classes:
C02F1/58; C02F1/02
Domestic Patent References:
| JP2006263500A | 2006-10-05 | |||
| JP2005144336A | 2005-06-09 | |||
| JP2005177669A | 2005-07-07 | |||
| JP2009011876A | 2009-01-22 | |||
| JPH10185154A | 1998-07-14 |
Foreign References:
| WO2007074751A1 | 2007-07-05 |
Attorney, Agent or Firm:
Axis International Patent Business Corporation