A Comparative Study on the Calcination and Hydration of Dolomite Using Microwave and Electric Furnaces

Young-Hwan Yu; Dae-Ju Hwang; Young-Jun Ahn; Kye-Hong Cho; Ji-Whan Ahn; Joong-So Choi

doi:10.32390/ksmer.2021.58.2.107

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2021 Vol.58, Issue 2 Preview Page Next Page

Research Paper

A Comparative Study on the Calcination and Hydration of Dolomite Using Microwave and Electric Furnaces 진공 마이크로웨이브로 및 전기로를 이용한 백운석의 소성 및 수화 반응 비교 연구

30 April 2021. pp. 107-118

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Abstract

Dolomite is used as a grinding product for steelmaking, glass, fertilizer and aggregate, and is used as a calcination product for steelmaking, refractory, wastewater purification, and gas purification. The purpose of this study was to produce a high-reactivity calcinated dolomite (CaO-MgO) and apply it in wastewater purification and gas purification. We used a microwave vacuum furnace and an electric furnace to induce internal and external heating of dolomite, respectively. A 99.3% pure dolomite with a < 20 mm size fraction was used in this study and calcined by microwave vacuum at 850°C for 60 min. A higher reactivity was revealed by employing the Brunauer-Emmett-Teller (BET) surface area of 22.04 m²/g and a hydration temperature of 90°C in 10 min of the reaction time, as measured using the ASTM C110 method.

Keywords

Dolomite

Calcinated dolomite

Calcination

Hydration

Microwave

백운석(dolomite)은 파분쇄 된 제품으로 제강, 유리, 비료, 골재용 등에 사용되고, 소성 제품으로 제강용, 내화물, 폐수정화, 가스정화 등에 사용된다. 본 연구에서는 폐수정화, 가스정화에 적용을 위한 고반응성 경소백운석(CaO·MgO) 제조를 목표로 하였다. 내부 가열 방식인 마이크로웨이브 진공 소성과 외부 가열 방식의 전기로로 상압 소성을 실시하여 실험을 진행하였다. XRD, XRF, SEM, BET 등을 분석하고, 수화 등을 확인하였다. 백운석은 20 mm 이하로 화학 조성이 Ca·Mg(CO₃)₂를 99.3 mass%, CaCO₃ 0.7 mass%의 원석을 사용하였다. 마이크로웨이브 진공 소성에서 850°C/60 min에서 BET 22.04 m²/g를 나타내었고, ASTM C 110의 규격으로 수화를 측정한 경우에 마이크로웨이브 진공 소성 조건에서 수화 반응시간 10 min 이내, 최고온도 90°C 이상의 높은 반응열을 보이고, 고반응성의 경소백운석(CaO·MgO)의 제조가 가능하다.

키워드

백운석

경소백운석

소성

수화

마이크로웨이브

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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 : 58
No :2
Pages :107-118
Received Date : 2020-11-18
Revised Date : 2021-02-24
Accepted Date : 2021-04-27
DOI :https://doi.org/10.32390/ksmer.2021.58.2.107

Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

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