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http://dx.doi.org/10.7844/kirr.2016.25.3.29

A Feasibility Study on the Utilization of by-Product Sludge Generated from Waste Concrete Recycling Process  

Shin, Hee-young (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Ji, Sangwoo (Geologic Environment Research Division, Korea Institute of Geoscience and Mineral Resources)
Woo, Jeong-youn (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources)
Ahn, Gi-oh (Geological Research Division, Korea Institute of Geoscience and Mineral Resources)
An, Sang-ho (R&D Tech-Biz Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.25, no.3, 2016 , pp. 29-36 More about this Journal
Abstract
The characteristics analysis and pH neutralization test were carried out to use of slurry generated from recycling processes of construction wastes. D (5.0) of raw sludge was $42.4{\mu}m$ and over 60 % of sludge distribute under 45 um (-325 mesh). Muscovite and carbonate minerals were main minerals of fine particles, and the portion of carbonate minerals increased as particle size decreased. Although the more heavy metals were observed in the finer particle size, the contents was found to be less than Korean contaminated soil regulation (area 2). The effects of flocculants addition for accelerating solid-liquid separation were negligible because the slurry already contains excess of coagulant added in the waste concrete recycling process. It was difficult to neutralize the sludge supernatant due to high pH (about 12) by adding acids, but the introduction of $CO_2$ decreased the pH to 8.5, The precipitate recovered during $CO_2$ introduction was determined to be $CaCO_3$ with XRD, and it indicates that high pure $CaCO_3$ could be obtained during the process.
Keywords
Construction waste; Waste Concrete; Recycling; Sludge; $CaCO_3$;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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