opslag Mg(OH)2

Increase alkalinity in a cost efficient way

When alkalinity is needed in any industrial process, many consider sodium hydroxide (caustic soda) at first. Magnesium hydroxide can be a cost efficient alternative depending on the circumstances. The lesser availability and high prices of caustic soda at the moment make it worthwhile to (re)consider this alternative.

Both magnesium hydroxide and sodium hydroxide are used to increase alkalinity or neutralize acids in industrial processes. Whereas sodium hydroxide is a strong base that rapidly raises to pH 12 or higher, magnesium hydroxide reacts more slowly and increases the pH to 9 or 10. Especially for biological processes, the fact that magnesium hydroxide buffers at a lower pH is an advantage. 

Magnesium hydroxide contains more hydroxide ions per molecule than caustic soda. With magnesium hydroxide, dosage can be reduced by 25% for same alkalinity compared to a 50% NaOH solution. Taking into account the price difference, total savings can be up to 60%. 

Cost comparison neutralization

Figure 1. Cost comparison of neutralization in €/dmt based on 600 dmt NaOH consumption.

Magnesium hydroxide, like sodium hydroxide, is widely used in industrial and communal wastewater plants for effluent treatment, metal precipitation or any pH or odor control. For flue gas treatment magnesium hydroxide can be used to remove sulphur oxide compounds and for pH adjustment. Lots of other processes that require alkalinity might as well benefit from magnesium hydroxide.

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