While Mg(OH)2 is typically more expensive on a “price per unit” basis, it is significantly less expensive in use. Every 1.0 kg of 50% NaOH can be replaced by 0.6 kg of 60% Mg(OH)2 to provide the same number of moles of hydroxide (OH-) for pH neutralization.Check the comparison table
Magnesium hydroxide (unlike sodium hydroxide) has coagulation properties. This means:
When an alkaline compound dissolves in water it produces hydroxide ions, OH- . These ions are responsible for the alkalinity of the solution.
Because Magnesium Hydroxide Mg(OH)2 provides two hydroxides for alkalinity compared to one with NaOH caustic soda, the usage rate for Mg(OH)2 is much less than that required for NaOH.
Lower cost-per-litre ≠ cheaper
While ACTI-Mag is typically more expensive than 50% NaOH on a “price per unit” basis, it is significantly less expensive in use – because every 1.0 kg of 50% NaOH can be replaced by 0.6 kgs of 60% Mg(OH)2 to provide the same number of moles of hydroxide (OH-) for pH neutralization.
The wastewater stream for many industrial processes can be quite unpredictable and inconsistent. Dramatic changes in pH can have adverse effects on the settleability of suspended solids. To stabilise the pH, the wastewater is commonly neutralised with alkalis. The nature of the alkali selected can have a dramatic impact on the ability to settle suspended solids.
Caustic soda typically provides no settling benefit and often results in gelatinous sludge that does not dewater easily. With lime (Ca(OH)2) there is typically a significant increase in sludge volume due to the formation of calcium minerals, like calcium carbonate (CaCO3).
ACTI-Mag has a higher neutralising value per kilo when compared with caustic whilst being significantly safer to handle than other traditional alkalis, making it a very safe and cost competitive option.Download ACTI-Mag Safety Data Sheet
Unlike caustic soda, ACTI-Mag is non-hazardous and non-corrosive, which makes it easier and safer to handle. Spill is not reportable.
Because magnesium is a macronutrient – it is the core element of chlorophyll (makes everything green!) – it is also beneficial to the environment while sodium is a salinity hazard.
Magnesium also has coagulation properties that sodium does not. This can result in reduced sludge volume and reduced sludge hauling fees.
In this simple benchtop experiment, we will demonstrate that magnesium hydroxide provides more CaCO3 equivalent alkalinity on an equal weight basis when compared to caustic soda, which means less chemical consumption and can result in significant cost savings. Magnesium hydroxide is also non-hazardous and non-corrosive which makes handling safer and easier.
Magnesium hydroxide is also non-hazardous and non-corrosive which makes handling safer and easier.
To see how much you could save by switching to ACTI-Mag, use our Savings Calculator.Use our savings calculator
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