Study on the Classification of Fine Particles by Using a Multi-step Hydrocyclone for the Recycling of Waste Concrete Slurry

Hwanju Jo; Sang-woo Ji; Hee-young Shin; Junghyun Jo; Jeongyun Kim; Jun-Hwan Bang

doi:10.32390/ksmer.2019.56.1.073

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2019 Vol.56, Issue 1 Preview Page Next Page

Technical Report

Study on the Classification of Fine Particles by Using a Multi-step Hydrocyclone for the Recycling of Waste Concrete Slurry 폐콘크리트 슬러리의 재활용을 위한 다단 습식사이클론을 이용한 입도분리 연구

28 February 2019. pp. 73-78

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Abstract

This paper investigated the multistep hydrocyclone particle classification for efficient and environmentally-safe use of by-product slurry from waste concrete treatment. The sludge obtained from the de-watering process of waste concrete treatment slurry is mixed with tap water at different solid-to-liquid ratios (%). Overall, the multistep hydrocyclone system appropriately classified the waste concrete slurry into three different particle sizes. Nevertheless, selectivity increase was observed with particle size under 2 µm regardless of the solid-to-liquid ratio. It is induced by scrubbing of the aggregates during particle size measurement, which were discharged as underflow during the hydrocyclone process. The multistep particle classification system proposed in this study effectively separated the fine particles in the slurry emitted from waste concrete treatment.

Keywords

Hydrocyclone

Waste concrete

Multi step classification

폐콘크리트 처리 공정에서 발생하는 슬러리의 효율적이고 친환경적인 이용을 위해 다단계 분급을 통해 슬러리 내 미분을 입도별로 분리하는 연구를 수행하였다. 본 연구에서는 폐콘크리트 재활용 공정에서 발생하는 슬러리로부터 수분을 제거한 슬러지를 다양한 고액비 조건에서 3단계 습식사이클론 시스템을 이용하여 분급실험을 수행하였다. 전반적으로 사이클론 단계별로 입도가 분리되어 폐콘크리트 슬러지의 입도 분리가 비교적 잘 진행되었다. 그러나 모든 고액비 조건에서 2 µm 이하 입도 구간에서는 selectivity가 증가하는 결과가 관찰되었다. 이는 원시료 중 일부 응집제에 의해 뭉쳐졌던 입자가 해쇄되지 못하고 underflow로 배출된 후 입도 분석 과정에서 해쇄되어 미립으로 분석된 것이 원인으로 판단된다. 본 연구에서 설계한 다단계 분급 시스템을 통해 적절한 고액비로 조절한 폐콘크리트 슬러리를 투입할 경우 미분을 효과적으로 입도별로 분급처리 할 수 있을 것으로 기대된다.

키워드

습식사이클론

폐콘크리트

다단계분급

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Information

Publisher :The Korean Society of Mineral and Energy Resources Engineers
Publisher(Ko) :한국자원공학회
Journal Title :Journal of the Korean Society of Mineral and Energy Resources Engineers
Journal Title(Ko) :한국자원공학회지
Volume : 56
No :1
Pages :73-78
Received Date : 2019-01-21
Revised Date : 2019-02-18
Accepted Date : 2019-02-22
DOI :https://doi.org/10.32390/ksmer.2019.56.1.073

Journal of the Korean Society of Mineral and Energy Resources EngineersISSN:2288-0291(Print) 2288-2790(Online)한국자원공학회

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