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http://dx.doi.org/10.14478/ace.2016.1058

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

Na, Choon-Ki (Department of Environmental Engineering, Mokpo National University)
Park, Hyunju (Institute of Construction and Environmental Engineering, Seoul National University)
Publication Information
Applied Chemistry for Engineering / v.27, no.4, 2016 , pp. 427-432 More about this Journal
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.
Keywords
bittern; recycling; magnesium recovery; salt farm; precipitation process;
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