AI Article Synopsis
- The study aimed to examine how magnesium affects the removal of sulfate from mine water as gypsum, using simulations and lab tests.
- Results indicated that at a pH of 9.6, magnesium kept sulfate dissolved as magnesium sulfate, hindering its removal as gypsum.
- By increasing the pH to 12.5, magnesium precipitated as magnesium hydroxide, which improved sulfate removal and could also aid in forming gypsum crystals.
Article Abstract
The aim of this research was to investigate the effect of magnesium on the removal efficiency of sulphate as gypsum from mine water. The precipitation conditions were simulated with MINEQL + software and the simulation results were compared with the results from laboratory jar test experiments. Both the simulation and the laboratory results showed that magnesium in the mine water was maintaining sulphate in a soluble form as magnesium sulphate (MgSO4) at pH 9.6. Thus magnesium was preventing the removal of sulphate as gypsum (CaSO4·2H2O). However, change in the lime precipitation pH from 9.6 to 12.5 resulted in magnesium hydroxide (Mg(OH)2) precipitation and improved sulphate removal. Additionally, magnesium hydroxide could act as seed crystals for gypsum precipitation or co-precipitate sulphate further enhancing the removal of sulphate from mine water.
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| http://dx.doi.org/10.1016/j.jenvman.2015.05.009 | DOI Listing |
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