Development of a Continuous Process for High Surface Area Slaked Lime Depending on Additive Mixing Methods and Drying Temperature

Young-jin Kim; Tae-hyung Kim; Na-yeong Kim; Jin-sang Cho

doi:10.7844/kirr.2025.34.1.68

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2025 Vol.34, Issue 1 Preview Page

Technical Note

Development of a Continuous Process for High Surface Area Slaked Lime Depending on Additive Mixing Methods and Drying Temperature 첨가제 혼합방법 및 건조 온도에 따른 고비표면적 소석회 연속공정 개발

28 February 2025. pp. 68-74

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Abstract

This experiment was conducted to enhance the specific surface area of hydrated lime (Ca(OH)₂) varying the mixing methods of raw materials and additives(Ethylene glycol), as well as the drying temperature conditions. The specific surface area of the slaked lime increased at the raw material and ethylene glycol were first mixed using a dry method and then reacted with water. In the drying temperature variation experiments, the specific surface area of hydrated lime increased as the temperature rose, and this effect was more pronounced under the dry mixing condition of the raw material and additive. Under optimal conditions, pre-mixed with the sieved to below 200 mesh of quicklime with additive and dried at 350 ℃ for 30 minutes, hydrated lime with a specific surface area of 39.2 m²/g was produced(W/CaO = 0.5, reaction temperature: 45 ℃, and 4 wt.% ethylene glycol). Hydrated lime with a specific surface area of 32.6 m²/g was obtained by applying an air-classifying mill under these optimized experimental conditions.

Keywords

Mixing method

Drying temperature

Calcium hydroxide

ethylene glycol

specific surface area

에틸렌글리콜을 첨가제로 사용하여 첨가제와 원료의 혼합방식 및 건조 온도 조건을 변화시켜 소석회(Ca(OH)₂)의 비표면적 향상 실험을 실시하였다. 원료와 첨가제인 에틸렌글리콜을 먼저 건식 방식으로 혼합 후에 물과 반응하는 조건에서 소석회의 비표면적이 크게 향상하는 경향을 나타냈다. 건조 온도 변화 실험에서는 온도가 증가함에 따라 비표면적이 증가하는 특성이 있었으며, 원료와 첨가제를 우선 건식 방식으로 혼합 조건에서 비표면적 증가가 높게 나타났다. 200 mesh 이하로 체질한 생석회를 대상으로 원료와 첨가제를 우선 혼합한 후, 350 ℃, 30 min. 건조한 시료의 조건에서 비표면적이 39.2 m²/g의 소석회를 제조하였다(W/CaO = 0.5, 반응 온도 45 ℃, 에틸렌글리콜 4 wt.%). 최적 실험 조건을 기류식 미분쇄기(Air classifying mill)에 적용한 실험에서는 32.6 m²/g의 비표면적을 갖는 소석회 제조가 가능하였다.

키워드

혼합방법

건조 온도

소석회

에틸렌글리콜

비표면적

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 34
No :1
Pages :68-74
Received Date : 2024-12-17
Revised Date : 2025-01-10; 2025-02-11
Accepted Date : 2025-02-11
DOI :https://doi.org/10.7844/kirr.2025.34.1.68

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

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