Title:
PROCESSING METHOD OF FLUORINE-CONTAINING EFFLUENT
Document Type and Number:
Japanese Patent JP2018158319
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method of treating fluorine-containing effluent which can effectively remove fluorine so as to satisfy drainage standards without returning sludge in an acidic solution containing fluorine and having a pH of 5 or less.SOLUTION: The present invention relates to a method for adding calcium salt to fluorine-containing effluent and separating and removing the fluorine as a sparingly soluble precipitate, which is a method of fluorinating produced by adding calcium salt to fluorine-containing effluent. The generated calcium fluoride is agglomerated by using a sulfonic acid type anionic coagulant. Alternatively, calcium fluoride generated by adding a calcium salt to fluorine-containing effluent is agglomerated by using a nonionic coagulant and then agglomerated by using an anionic coagulant.SELECTED DRAWING: None
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Inventors:
MURAKI TSUTOMU
SHIBAYAMA HARUO
SHIBAYAMA HARUO
Application Number:
JP2017058160A
Publication Date:
October 11, 2018
Filing Date:
March 23, 2017
Export Citation:
Assignee:
SUMITOMO METAL MINING ENG CO LTD
International Classes:
C02F1/58; B01D21/30; C02F1/56
Domestic Patent References:
| JP2013017905A | 2013-01-31 | |||
| JP2004314009A | 2004-11-11 | |||
| JP2005087835A | 2005-04-07 | |||
| JP2014171967A | 2014-09-22 | |||
| JP2004121948A | 2004-04-22 | |||
| JPH0686988A | 1994-03-29 | |||
| JPH10277307A | 1998-10-20 |
Attorney, Agent or Firm:
Masayuki Masabayashi
Hayashi Ichiyoshi
Hayashi Ichiyoshi