Magnesium oxide activation failure significantly affects its chemical activity, physical flowability, reaction rate, and the stability of the final product, leading to substandard performance or process failure in industrial applications.
1. Decreased Chemical Activity
Activation failure means that the active magnesium oxide content is <60%, failing to fully decompose Mg(OH)₂ into MgO; this directly weakens its reactivity with acids, magnesium chloride, and other reactants, affecting the gelation speed and strength development; in magnesium oxide boards and fireproof materials, this manifests as slow setting, low early strength, or even failure to harden.
Insufficient activity disrupts the formulation balance, requiring additional dosage, increasing costs, and potentially causing side effects.
2. Deterioration of Physical Properties
|
Performance Indicators |
Failure Manifestations |
Consequences |
|
Flowability |
Powder agglomeration, difficult pouring |
Inaccurate metering, uneven mixing, affecting automated feeding |
|
Dispersibility |
Particle aggregation, poorly soluble in the liquid phase |
Formation of "fish eyes" or sediment in slurry, affecting product uniformity |
|
Hygroscopicity |
Surface remains hydrophilic, easily absorbs moisture again |
Shortened shelf life, begins hydration during transportation |
Abnormal physical state directly interferes with the production process, increasing equipment cleaning frequency and downtime.
3. Process and Product Performance Risks
In the building materials field (e.g., magnesium oxide fireproof board):
Causes product efflorescence, blooming, deformation and cracking;
Reduces water resistance and long-term stability, shortening service life.
In the chemical and environmental protection fields:
When used as a desulfurizing agent, SO₂ absorption efficiency decreases by more than 30%;
When used in wastewater treatment, pH adjustment ability is weak, requiring increased dosage.
As a filler in rubber and plastics: Poor reinforcing effect, affecting vulcanization rate and finished product mechanical properties.
Overall, this results in increased production costs, higher scrap rates, and more customer complaints.
4. Long-term storage risks: Even if unactivated magnesium oxide is usable in the short term, it will continue to slowly hydrate during storage due to residual moisture and undecomposed components; after several weeks, it will caking and further decrease in activity, resulting in raw material waste.
It is recommended to test the activity and moisture content of each batch of activated product to ensure compliance with HG/T 3928-2012 standard.
