513 magnesium hydroxide sulfate hydrate (MHSH) and Mg(OH)₂ were synthesized by controlling the pH and concentration using a domestic resource, dolomite (CaMg(CO3)2), as the raw material. The MgSO₄ was extracted by treating dolomite with sulfuric acid under various conditions. Hexagonal plate-shaped Mg(OH)₂ and needle-like 513 MHSH were synthesized under the hydrothermal condition. The morphology of the synthesized materials was controlled by adjusting the pH (SO42-/OH- ratio) and hydrothermal reaction time. As the pH of the solution increased, the formation of plate-like structures became dominant, whereas lower pH values (higher SO42- concentration) led to needle-like forms. The results of the 513 MHSH, which was synthesized using reagents and sea bittern, are consistent with the synthesis conditions, and we observed changes in the length and aspect ratio of the needle-shaped structure in response to adjusting the hydrothermal reaction time.

1. Introduction 
2. Experimental Section 
    2.1 재료 및 분석기기 
    2.2 백운석으로부터 MgSO4 용액 추출 
    2.3 염기성 침전제의 양에 따른 513 MHSH 합성 
    2.4 수열합성 시간에 따른 513 MHSH 관찰 
3. Results and Discussion 
    3.1 백운석 성분 분석결과 
    3.2 다양한 조건으로부터 추출한 MgSO4 용액 
    3.3 513 MHSH 합성 
    3.4 수열합성 시간에 따른 513 MHSH 형상 변화 연구 
4. Conclusion 
Funding
Conflict of Interest 
Data Availability Statement 
Author Information and Contribution 
Acknowledgments
References

• 심현승(한국세라믹기술원 엔지니어링 소재 센터) | HyunSeung Shim (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, Republic of Korea)
• 김유진(한국세라믹기술원 엔지니어링 소재 센터) | YooJin Kim (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, Republic of Korea) Corresponding author
• 김지연(한국세라믹기술원 엔지니어링 소재 센터, 연세대학교 배터리공학과) | Jiyeon Kim (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon 17303, Republic of Korea, Department of Battery Engineering, Yonsei University, Seoul 03722, Republic of Korea)
• 황성주(연세대학교 배터리공학과) | Seong-Ju Hwang (Department of Battery Engineering, Yonsei University, Seoul 03722, Republic of Korea)