PRODUCTION OF ARTIFICIAL LIGHTWEIGHT AGGREGATE

• Main Authors: ITANO SHIGEO, KAI TOSHIO, SERA TOSHIKUNI, FUJIWARA KUNIHISA
• Format: Patent
• Language: English
• Published: 15.04.1991
• 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

PURPOSE:To prevent the melt bonding of green pellets to each other and to enhance yield by coating the green pellets of granulated coal ash with MgO and/or ZrO2 and sintering the coated green pellets. CONSTITUTION:Water, coal ash and a binder in separate hoppers 1-3 are fed into a kneader 4, kneaded and fed into a pan type granulator 5, where the kneaded material is granulated and coated with powder of MgO and/or ZrO2. The resulting coated green pellets are housed once in a hopper 6 and dropped on a grate 7' covered with grate protecting bed pellets fed from a hopper 6'. The dropped pellets are introduced into a sintering furnace 7 isolated from the air, an igniting device 10 is ignited and the pellets are sintered under suction by a blower 9 through suction boxes 8. The sintered pellets are sent to a product recovering hopper 13 through a belt conveyor 12.