JPH05310456

PURPOSE:To produce a gypsum board of pulp sludge for high-strength building material as a means for reusing papermaking pulp sludge. CONSTITUTION:In producing building gypsum board of pulp sludge by blending papermaking pulp sludge (aggregate having 0.5-10mum used in papermaking from 25-150mum fibro...

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Bibliographische Detailangaben
Hauptverfasser:	TAMANOI HIDEO, SATO HARUKI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BUILDING BUILDING MATERIALS CEMENTS CERAMICS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE FIXED CONSTRUCTIONS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS LIME, MAGNESIA METALLURGY PERFORMING OPERATIONS PREPARING CLAY PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL,e.g. PLASTER REFRACTORIES SLAG STRUCTURAL ELEMENTS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TRANSPORTING TREATMENT OF NATURAL STONE WORKING CEMENT, CLAY, OR STONE
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Beschreibung
Zusammenfassung:	PURPOSE:To produce a gypsum board of pulp sludge for high-strength building material as a means for reusing papermaking pulp sludge. CONSTITUTION:In producing building gypsum board of pulp sludge by blending papermaking pulp sludge (aggregate having 0.5-10mum used in papermaking from 25-150mum fibrous material, such as clay, containing 40-60% free water) with gypsum, pressurizing and molding, blending of hydrous fine fibers of the papermaking pulp sludge and gypsum is carried out by applying shear force from a funicular-II region to a capillary region. Free water in the hydrous fine fibers of the pulp sludge is replaced with saturated water of gypsum by generated instant shear force, crystallization of gypsum dihydrate is completed in the fine fibers in the papermaking pulp sludge by mechanochemical reaction between the fine fibers and hemihydrate gypsum particles to efficiently react free water in the hydrous fine fibers with gypsum and to bring about complete adhesion of the fine fibers to the gypsum.