Synthesis of high-purity magnesium hydroxide using dolomite and bittern is important for use in various applications. We synthesized magnesium hydroxide using bittern and dolomite, which are domestic resources. In Bittern, there is a high concentration of Mg2+ ions, but the impurity Ca2+ ion content is also significant, requiring a purification process to remove it. There are two main methods for this purification. Firstly, there is a separation method that utilizes the difference in solubility between Mg2+ ions and Ca2+ ions by using sulfuric acid on dolomite. Adding MgSO4 solution from dolomite to Bittern removes Ca2+ ions as CaSO4. This process simultaneously purifies Ca impurities and increases the Mg/Ca ratio by adding extra Mg2+ ions. In this study, purified bittern was obtained by using dolomite and sulfuric acid to extract MgSO4, which was then used to purify Ca2+ ions. High-purity Mg(OH)2 was synthesized by optimizing the NaOH and NH4OH ratio as an alkaline precipitant. Mg(OH)2 synthesis technology made by effectively removing Ca ions from dolomite and bittern can contribute to domestic pilot production.

1. Introduction
2. Experimental Section
    2.1 재료 및 분석기기
    2.2 H2SO4을 이용한 백운석 내 Ca2+ 제거 및 MgSO4 추출
    2.3 MgSO4을 이용한 간수 내 Ca2+ 정제
    2.4 Ca2+이 정제된 간수에 염기성 침전제를 첨가하여 Mg(OH)2 제조
3. Results and Discussion
    3.1 백운석 성분 분석결과
    3.2 간수 성분 분석결과
    3.3 백운석과 다양한 H2SO4의 농도에 따른 MgSO4용액 추출
    3.4 H2SO4과 백운석의 몰 비율 변화에 따른 MgSO4용액 추출
    3.5 H2SO4과 백운석의 반응시간에 따른 MgSO4용액 추출
    3.6 MgSO4을 이용한 간수 내 Ca2+ 정제
    3.7 Ca2+이 정제된 간수에 염기성 침전제를 첨가하여 Mg(OH)2 제조
4. Conclusion
Funding
Conflict of Interest
Data Availability Statement
Author Information and Contribution
Acknowledgments
References

• 오누리(한양대학교 신소재 공학과) | Nuri Oh (Division of Materials Science & Engineering, Hanyang University, Seoul, Republic of Korea)
• 최아름(한국세라믹기술원 엔지니어링 소재 센터, 한양대학교 신소재 공학과) | Areum Choi (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon, Republic of Korea, Division of Materials Science & Engineering, Hanyang University, Seoul, Republic of Korea)
• 심현승(한국세라믹기술원 엔지니어링 소재 센터) | HyunSeung Shim (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon, Republic of Korea)
• 김지연(한국세라믹기술원 엔지니어링 소재 센터) | Jiyeon Kim (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon, Republic of Korea)
• 김유진(한국세라믹기술원 엔지니어링 소재 센터) | YooJin Kim (Engineering Materials Center, Korea Institute of Ceramic Engineering and Technology, Icheon, Republic of Korea) Corresponding author