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Magnesium hydroxide is a new alkali for wet type flue gas desulphurization and dechlorination processes. This alkali is manufactured by precipitating magnesium hydroxide from the raw materials dolime (CaO.MgO) and magnesium chloride brine. Used in wet flue gas desulphurization (FGD) systems, magnesium hydroxide reacts with the SO2 in the off-gasses forming a concentrated magnesium sulphate solution. In dechlorination systems magnesium hydroxide reacts with the HCl forming a magnesium chloride solution. Compared to sodium hydroxide in flue gas treatment, significant savings can be made with the use of magnesium hydroxide due to its much lower consumption (70%). Magnesium hydroxide is classified as a non-hazardous product.