GRANULAR FOAMED SLAG CONSISTING OF SEWAGE SLUDGE

• Main Authors: HARA MIKIKAZU, INOKAWA NOBURO, TAKEBE TAKASHI, SHINDO TAKASHI, KANEKO SENJI, HOSHINO YASUSHI
• Format: Patent
• Language: English
• Published: 21.04.1992
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF NATURAL STONE; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PURPOSE:To improve foamability by incorporating a specified amt. of P or a P compd. and specifying the bulk density. CONSTITUTION:Viscosity controlling limestone is added to the ash having a specified content of P or a P compd. and obtained by burning sewage sludge, and the mixture is melted by an electric furnace. The molten slag 2 is dripped into a water tank 5 set below a tundish 1 through the tundish 1 having a specified hole diameter. The water tank 5 is always agitated by an agitator 4 to granulate the molten slag 2 dripped as a droplet current 3, and a granular foamed slag contg. 3-20wt.% of P or a P compd. and having 0.2-1.0 bulk density is obtained.