Characteristics Analysis of Chlorine Bypass Dust and Water- washed Residue

Sun-Mok Lee; Daekeun Lee; Jun-Ho Kil; Taewoo Lee; Hun Song; Woo Sung Yum

doi:10.7844/kirr.2023.32.5.44

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2023 Vol.32, Issue 5 Preview Page Next Page

Research Paper

Characteristics Analysis of Chlorine Bypass Dust and Water- washed Residue 염소 바이패스 분진 및 수세 잔류물의 특성분석

31 October 2023. pp. 44-51

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Abstract

The main components of chlorine bypass dust are calcium, alkali, and chlorine. Chlorine components must be removed from chlorine bypass dust to enable its recycling as a cement raw material. Cement companies usually employ water-washing treatment to recover KCl from chlorine bypass dust. In this study, the chemical composition, mineral properties, and microstructure of the chlorine bypass dust and washed residues obtained from a 35,000 ton/year chlorine-bypass-dust-washing facility were analyzed to determine the feasibility of recycling the dust and its washed residues. The chlorine content of the dust decreased from 23.9% to 1.4% after washing, thus confirming the possibility of using the washed residues as a cement raw material. The CaO component increased from 22.4% to 49.8% whereas the K₂O component decreased from 25.2% to 5.45%. The average particle diameter of the water-washed residues was 22.72 μm, which was significantly higher than that of the chlorine bypass dust before washing (12.13 μm). This result was attributed to the dissolution of chlorine compound particles measuring less than 1 μm in the chlorine bypass dust during washing.

Keywords

Cement

chlorine

bypass

dust

water washing

염소 바이패스 분진의 주성분은 칼슘, 알칼리 및 염소 성분이며, 시멘트 원료로 재활용하기 위하여 염소 성분 제거가 필요하다. 시멘트 업체에서는 염소 바이패스 분진의 시멘트 원료 사용과 KCl 회수를 위해서 수세 처리를 진행하고 있다. 본 연구에서는 염소 바이패스 분진 및 수세 잔류물의 재활용 가능성을 파악하기 위해서 35,000톤/년 규모 염소 바이패스 분진 수세 설비에서 사용한 염소 바이패스 분진과 수세 잔류물의 화학성분, 광물 특성 및 미세구조를 분석하였다. 염소 바이패스 분진의 염소 함량은 23.9%에서 수세 처리 후에 1.4%로 감소하여 수세 잔류물의 시멘트 원료 사용 가능성을 확인하였다. 수세 잔류물에서의 염소 성분은 대부분 Calcium Aluminium Oxide Chloride Hydrate 광물 형태로 존재하고 있음을 확인하였다. CaO 성분은 22.4%에서 49.8%로 증가하였으며, K₂O 성분은 25.2%에서 5.45% 감소하였다. 수세 잔류물의 평균입경은 22.72μm로 수세 전의 염소 바이패스 분진의 평균입경 12.13μm와 비교하여 크게 증가한 것을 알 수 있는데, 이것은 염소 바이패스 분진에 포함되어있는 1μm 이하의 염소화합물 입자가 수세 과정에서 용해되었기 때문인 것으로 판단되었다.

키워드

시멘트

염소

바이패스

분진

수세

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 32
No :5
Pages :44-51
Received Date : 2023-09-26
Revised Date : 2023-10-11
Accepted Date : 2023-10-13
DOI :https://doi.org/10.7844/kirr.2023.32.5.44

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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