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Recycling of Waste Bittern from Salt Farm (I) : Recovery of Magnesium

염전 폐간수의 재활용(I) : 마그네슘 회수

  • Na, Choon-Ki (Department of Environmental Engineering, Mokpo National University) ;
  • Park, Hyunju (Institute of Construction and Environmental Engineering, Seoul National University)
  • 나춘기 (목포대학교 환경공학과) ;
  • 박현주 (서울대학교 건설환경종합연구소)
  • Received : 2016.06.16
  • Accepted : 2016.07.15
  • Published : 2016.08.10

Abstract

The purpose of the research was to examine the utilization of waste bittern from salt farm as a source for producing magnesium (Mg). In this work, a precipitation process for recovering Mg, where Mg is precipitated as $Mg(OH)_2$ by the addition of NaOH solution, was investigated. At the NaOH/Mg molar ratios of 2.70 : 1 to 2.75 : 1 and pH 9.5-10, > 99% of Mg could be precipitated from the bittern. The molar concentration of NaOH solution added as an alkaline reagent had no significant influence on the recovery efficiency of Mg precipitate. The particle size of Mg precipitate was strongly affected by the flow rate of caustic addition. The faster the flow rate of caustic addition, the smaller particles were formed. The Mg precipitate recovered was 100-120 g per 1 L of bittern and contained 94% $Mg(OH)_2$ after washing with water. Our results showed that the bittern can be used as a potential resource for Mg production.

Acknowledgement

Supported by : 한국연구재단

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