METHOD FOR PRODUCING WHITE PIGMENT, WHITE PIGMENT PRODUCED BY THE METHOD, AND HIGH-GRADE PAPER COMPRISING SAID WHITE PIGMENT

WIPO Patent Application WO/2013/005756

A1

Provided is a method for producing a white pigment, comprising a first step of burning a sludge at 600-800˚C to produce paper-making sludge ashes, a second step of adding an aluminum processing sludge to the paper-making sludge ashes or adding the paper-making sludge ashes to the aluminum processing sludge, and subsequently adding/mixing water to/with the water-added mixture and then subjecting the resultant mixture to a hydrothermal reaction to produce a slurry-like material or, alternatively, adding/mixing water to/with the resultant mixture to produce a slurry-like material without a hydrothermal reaction, and a third step of subjecting the slurry-like material to a wet milling procedure to produce the white pigment. The method enables the production of a white pigment having a whiteness degree of 80% or more, which is a whiteness degree required for high-grade paper, at low production cost using PS and AS as raw materials.

KAWAGUCHI ISOKAZU (JP)
KAWAGUCHI KOICHIRO (JP)

PCT/JP2012/067039

January 10, 2013

July 04, 2012

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GOJO PAPER MFG CO LTD (JP)
KAWAGUCHI ISOKAZU (JP)
KAWAGUCHI KOICHIRO (JP)

C09C3/04; C01F7/021; C01F7/023; C01F7/441; C02F11/06; C02F11/08; C09C1/00; C09C1/28; C09C1/40; D21H17/01

JP2007106654A	2007-04-26
JP2004203732A	2004-07-22
JP2008001591A	2008-01-10
JP2006044978A	2006-02-16
JPH11314912A	1999-11-16
JP2000271555A	2000-10-03
JP2003137537A	2003-05-14
JP2001348510A	2001-12-18
JPH11310732A	1999-11-09
JP2003012322A	2003-01-15
JP2002173320A	2002-06-21

HASEBE Zentaro et al. (JP)
Zentaro Hasebe (JP)

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