PRODUCTION OF LIGHTWEIGHT AGGREGATE USING DEHYDRATED SLUDGE AS RAW MATERIAL

PURPOSE:To utilize foamability of a sludge itself, to simplify a process and to improve cost effectiveness by cracking a dehydrated sludge, drying and firing at high temp. CONSTITUTION:A filter cake of the dehydrated sludge 50-65% in water content obtained by dehydrating a precipitate settled by a f...

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Bibliographic Details
Main Authors SAKABA MASARU, FUJITA JINSHIRO, OSHIO KATSUHIRO, IKEMOTO NOBORU
Format Patent
LanguageEnglish
Published 06.09.1994
Edition5
Subjects
ARTIFICIAL STONE
CEMENTS
CERAMICS
CHEMISTRY
CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS
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
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Summary:PURPOSE:To utilize foamability of a sludge itself, to simplify a process and to improve cost effectiveness by cracking a dehydrated sludge, drying and firing at high temp. CONSTITUTION:A filter cake of the dehydrated sludge 50-65% in water content obtained by dehydrating a precipitate settled by a flocculant is cracked to below a prescribed particle size by a cracking machine. The cracked filter cake is dried to about 10% water content by a hot air of 150-200 deg.C in a hot air dryer. The dried sludge from which the fine particle portion if removed by sifting is rapidly heated to 1000-1300 deg.C and fired for 20-40min in a rotary kiln or the like to induce the internal foaming of the sludge due to aluminum in the flocculant, lime, iron or the like and the surface of the particle is fused and solidified. After the fired sludge is cooled, the sludge having an adequate particle size is sorted by a secondary screen. The sludge having below a fixed particle size together with the dust from the processes or the under size of the sorting process are humidified by adding water and granulated to the adequate particle size.
Bibliography:Application Number: JP19930035424