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Production of Concentrated Magnesium Solution from Seawater Using Industrial By-products

산업부산물을 이용한 해수로부터 고농도 마그네슘 용액의 제조

Cho, Taeyeon;Kim, Myoung-Jin
조태연;김명진

  • Received : 2016.04.27
  • Accepted : 2016.06.09
  • Published : 2016.06.30

Abstract

With the purpose of concentrating the magnesium from seawater, in this study, we have conducted experiments to precipitate the magnesium using three precipitants (NaOH, cement kiln dust, and paper sludge ash), and then extract it using sulfuric acid. Results show that the precipitation and extraction performance does not depend so significantly on the kind of precipitant: for all the precipitants used, the precipitation efficiency is measured almost 100% and the extraction efficiency is in the short range of 77 - 89%. The magnesium concentration in the extract is measured 4975 - 5775 mg/L, implying that the magnesium in seawater should be 3.8 - 4.4 times concentrated through the precipitation and extraction reactions. The reaction efficiency of the industrial by-product used as a precipitant in this study is almost 100% similar to those of the other existing expensive precipitants.

Keywords

Mg;seawater;recovery;industrial by-product;cement kiln dust;paper sludge ash

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  1. Precipitation of Magnesium Sulfate from Concentrated Magnesium Solution for Recovery of Magnesium in Seawater vol.25, pp.4, 2016, https://doi.org/10.7844/kirr.2016.25.4.32