A Study on Synthesis of Mayenite by Using Recycled Aluminium Resource for Application in Insulating Material

Byoungyong Im; Yubin Kang; Soyeong Joo; Dae-Guen Kim

doi:10.7844/kirr.2020.29.6.65

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2020 Vol.29, Issue 6 Preview Page Next Page

Research Paper

A Study on Synthesis of Mayenite by Using Recycled Aluminium Resource for Application in Insulating Material 알루미늄 재활용 소재를 이용한 내화재용 Mayenite 합성 연구

31 December 2020. pp. 65-72

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Abstract

Black dross is a dark gray dross generated during the aluminum recycling process that uses flux, and contains NaCl, KCl, Al₂O₃, MgO, etc. Black dross is separated into soluble substances (NaCl, KCl) and insoluble substances (Al₂O₄, MgO) through the dissolution process. Soluble materials can be reused as salt flux, and Al₂O₃ and MgO can be upcycled to various ceramic materials through the synthesis process. In this study, Mayenite was synthesized using Al₂O₃ and MgO recovered from black dross, and the synthesis was performed according to the mixing ratio and reaction temperature. It was confirmed that when Mayenite was synthesized using black dross (spinel) and CaCO₃, precursors were changed to Mg_0.4Al_2.4O₄ and CaO at 700 ℃, and to Ca₁₂Al₁₄O₃₃ (Mayenite) after 800 ℃. In the mixing conditions experiment, it was confirmed that the Mayenite XRD peak increased with increase of the CaCO₃ content, and the Mg_0.4Al_2.4O₄ XRD peak decreased. As a result of the BET analysis of the synthesized powder, the surface area decreased as the fine particles were grown and agglomerated in the process of generating mayenite.

Keywords

Mayenite

Refractories

Alumina

Black dross

Recycling

블랙 드로스는 알루미늄을 재활용하는 과정 중에 플럭스 사용에 의해 발생되는 짙은 회색의 드로스로서, NaCl, KCl, Al2O₃, MgO 등이 포함되어 있다. 블랙 드로스는 용해(dissolution) 공정을 통하여 용해성 물질(NaCl, KCl)과 불용해성 물질(Al₂O₄, MgO)로 분리가 가능하다. 이중 용해성 물질의 경우 Salt flux로 재활용이 가능하며, Al₂O₃, MgO의 경우 합성 공정을 통하여 다양한 세라믹 소재로 업사이클링이 가능하다. 본 연구에서는 블랙 드로스로부터 회수한 Al₂O₃, MgO를 이용하여 Mayenite를 합성 하였으며, 배합 비율 및 반응 온도 조건에 따른 합성을 실시하였다. 블랙 드로스(spinel)와 CaCO₃를 이용하여 Mayenite를 합성할 시 700 ℃에서 Mg_0.4Al_2.4O₄, CaO로 변하며, 800 ℃ 이후부터 Ca₁₂Al₁₄O₃₃(Mayenite)으로 변하는 것을 확인하였다. 배합 조건에는 CaCO₃ 함량이 증가함에 따라 Mayenite XRD 피크가 증가하며, Mg_0.4Al_2.4O₄ XRD 피크는 감소하는 것을 확인하였다. 합성된 분말의 BET 분석 결과 Mayenite가 생성되는 과정에서 미세한 입자가 성장되고 응집됨에 따라 비표면적은 감소하는 거동을 보였다.

키워드

마이에나이트

내화재

알루미나

블랙 드로스

재활용

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Journal of the Korean Institute of Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 29
No :6
Pages :65-72
Received Date : 2020-11-09
Revised Date : 2020-12-07
Accepted Date : 2020-12-14
DOI :https://doi.org/10.7844/kirr.2020.29.6.65

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

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