The Production of Light Weight Aggregates from Municipal Refuses

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  • 都市ごみを原料とする軽量骨材の製造
  • トシ ゴミ オ ゲンリョウ ト スル ケイリョウ コツザイ ノ セイゾウ

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Studies on utilization of the inorganic residues separated from Resource Recovery System (RRS) of municipal refuses were conducted.<br>The separated inorganic residues can be classified into glasses, gravels and porcelains, and bones and shells. On this component system, a swelling test was performed to determine the swelling temperature. The dust discharged from the pyrolysis subsystem of the municipal refuses was used as one of the acidic additives and the relationship between the swelling and the mixing dust content was also examined. The highest allowable dust content was 30wt% in the mixture suitable for raw materials of light weight aggregates.<br>A 1t/d production scale pilot plant, designed from the results of the basic studies, was installed at the site of “Star Dust '80 RRS plant” and a long term running test was carried out. It proved that curing process must be introduced to avoid green pellets from breakage through transportation in the plant. From the running test optimal operational conditions of each process were determined and data for scale up were obtained.<br>Properties of the product obtained were as follows. Specific gravity ranges from 0.9 to 1.6, water absorption was 5 to 17%, ratio of absolute volume was 60 to 63%. Further tests were conducted according to JIS A5002 (the light weight concrete) which proved that the concrete satisfied the standard specifications. The amount of toxic materials dissolved from the products were under the regulation limits.

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