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Title:
PRODUCTION METHOD FOR ARTIFICIAL LIGHTWEIGHT AGGREGATE AND ARTIFICIAL LIGHTWEIGHT AGGREGATE OBTAINED BY THE METHOD
Document Type and Number:
Japanese Patent JP2000247700
Kind Code:
A
Abstract:

To provide a method for easily and inexpensively producing artificial lightweight aggregate using a simple device and equipment.

The method for producing the artificial lightweight aggregate is comprised of mixing limestone being a main raw material, cement and, if necessary, calcium sulfate, then granulating the obtained mixture using a tumbling granulator such as a pelletizer and steam curing the obtained granulates under high pressure. Weight ratio of the cement and calcium sulfate is in the range of 15 to 50 wt.%, and is not more than 10 wt.% expressed in terms of CaSO4 respectively. The curing conditions are such that the temp. is in the range of 120 to 250°C and the curing time is not less than 1 h, preferably not less than 3 h. The artificial lightweight aggregate thus obtained has a specific gravity in oven-dried condition of 1.4 to 2.0 g/cm3 and a uniaxial compressive fracture strength of ≥30 kgf.


Inventors:
KAGAKUI ATSUSHI
CHIYOUNAN TAKESHI
SUDO SHINGO
KAWAMOTO KOJI
Application Number:
JP5358899A
Publication Date:
September 12, 2000
Filing Date:
March 02, 1999
Export Citation:
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Assignee:
SUMITOMO METAL MINING CO
International Classes:
C04B18/02; C04B18/10; C04B28/00; B09B3/00; (IPC1-7): C04B18/10; B09B3/00