Title:
CALCIUM REMOVAL METHOD
Document Type and Number:
WIPO Patent Application WO/2011/162033
Kind Code:
A1
Abstract:
Provided is a calcium removal method that can reduce operating costs. A solution (L2) that contains potassium and/or sodium and calcium is passed through an ion exchange resin (35) and the potassium and/or sodium and calcium is isolated. The addition of potassium carbonate to remove calcium, as in conventional methods, is not necessary, so operating costs can be greatly reduced. The exchange timing of calcium containing water (L3) discharged from the ion exchange resin and saline (L4) can be controlled on the basis of the measured calcium or chlorine concentrations in the liquid discharged from the ion exchange resin and one or more of the measurement results selected from a group consisting of pH and electrical conductivity. A solution (L1) obtained by washing chlorine bypass dust (D) generated in a cement baking process or a percolate (W) from the final disposal site can be used as the solution.
Inventors:
TAMURA NORITOSHI (JP)
SUZUKI TAKAYUKI (JP)
OTANI HIROKAZU (JP)
SUZUKI TAKAYUKI (JP)
OTANI HIROKAZU (JP)
Application Number:
PCT/JP2011/060821
Publication Date:
December 29, 2011
Filing Date:
May 11, 2011
Export Citation:
Assignee:
TAIHEIYO CEMENT CORP (JP)
TAMURA NORITOSHI (JP)
SUZUKI TAKAYUKI (JP)
OTANI HIROKAZU (JP)
TAMURA NORITOSHI (JP)
SUZUKI TAKAYUKI (JP)
OTANI HIROKAZU (JP)
International Classes:
C02F1/42; B01J47/14; B01J49/00
Foreign References:
| JP2004262676A | 2004-09-24 | |||
| JP2004330148A | 2004-11-25 | |||
| JP2003001218A | 2003-01-07 | |||
| JP2000061422A | 2000-02-29 | |||
| JP2001070989A | 2001-03-21 | |||
| JPS6053395U | 1985-04-15 | |||
| JP2007260633A | 2007-10-11 | |||
| JPH0531185A | 1993-02-09 | |||
| JPH1085791A | 1998-04-07 |
Other References:
None
Attorney, Agent or Firm:
NAKAI JUN (JP)
Nakai 潤 (JP)
Nakai 潤 (JP)
Download PDF:
Claims: