METHOD FOR PRODUCING CARBON DIOXIDE-ABSORBED SLUDGE FINE POWDER, CARBON DIOXIDE-ABSORBED SLUDGE FINE POWDER, AND HYDRAULIC HARDENED BODY

Title:

METHOD FOR PRODUCING CARBON DIOXIDE-ABSORBED SLUDGE FINE POWDER, CARBON DIOXIDE-ABSORBED SLUDGE FINE POWDER, AND HYDRAULIC HARDENED BODY

Document Type and Number:

WIPO Patent Application WO/2023/139715

Kind Code:

A1

Abstract:

[Problem] To provide a method for producing a carbon dioxide-absorbed sludge fine powder which has high fluidity and serves as a binder material for low carbon materials. [Solution] According to the present invention, a slurry is obtained by adding water to residual concrete or return concrete; sludge water is obtained by separating and removing gravel and sand from the slurry; concentrated sludge water is obtained by separating and removing fine sand fractions from the sludge water by means of a wet cyclone; and a sludge cake is obtained by dehydrating the concentrated sludge water. A carbon dioxide-absorbed sludge fine powder is obtained by putting the sludge cake in a rotary drum and supplying hot air and high-concentration carbon dioxide thereto so that the sludge cake is crushed and dried, while being caused to absorb carbon dioxide. Alternatively, a sludge fine powder is obtained by putting the sludge cake in a rotary drum and supplying hot air thereto so that the sludge cake is crushed and dried. A carbon dioxide-absorbed sludge fine powder is obtained by exposing this sludge fine powder to high-concentration carbon dioxide.

Inventors:

OHKAWA KEN (JP)
AOKI SHINICHI (JP)
MOMOSE HARUKI (JP)
TOMOE SHIRO (JP)
KANDA TETSUSHI (JP)
YODA KAZUHISA (JP)
KASAI HIROSHI (JP)
SAKATA NOBORU (JP)

Application Number:

PCT/JP2022/001938

Publication Date:

July 27, 2023

Filing Date:

January 20, 2022

Export Citation:

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Assignee:

SANWASEKISAN CORP (JP)
KAJIMA CORP (JP)

International Classes:

B01D53/62; B09B5/00; B01J20/04; C02F11/12; C04B7/24

Foreign References:

JP2011067764A	2011-04-07
JP2021138574A	2021-09-16
JPH078796A	1995-01-13

Other References:

HARUKI MOMOSE ET AL.: "Development of ready-mixed concrete using fine dried sludge powder as an admixture", KASHIMA INSTITUTE OF TECHNOLOGY ANNUAL REPORT, no. 66, 1 December 2018 (2018-12-01), Tokyo, pages 75 - 84, XP009547764, ISSN: 0918-015X