How to Choose a Suitable Method for Magnesium Oxide Purity Testing
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To provide reliable and traceable results, the standard HG/T 3928-2012 should be the basis for choosing an appropriate method for magnesium oxide purity testing, giving priority to chemical analysis techniques from independent CNAS-certified laboratories. Simple techniques for on-site preliminary screening can be combined, but they cannot take the place of rigorous testing.
1. Fundamental Ideas for Correctly Choosing Testing Techniques
Situations for Applications
Suggested Techniques
Basis and Benefits
Arbitration, Acceptance, and Quality Release
Chemical analysis in a third-party CNAS laboratory
Legally sound, error-free, and compliant with standards
Quick Screening in the Manufacturing Process
X-ray fault detection combined with a portable density metre and eye inspection
reduces the expense of inefficient testing by quickly identifying clear problems.
Initial Assessment of Raw Material Storage
Density test plus moisture analyser
helps in decision-making by determining whether it is moist or incorrectly filled.
Professional testing must be the basis for the final decision; alternative approaches should only be used for supplementary research.
2. Evaluation of Various Detection Techniques' Applicability
Approach
Items That Can Be Detected
Suitable for Use as a Release Basis
Stage of Applicability
Titration of Acid-Base (CNAS)
Content of MgO
Indeed,
Final Verification
Method of Hydration (CNAS)
Magnesium oxide that is active
Indeed,
Final Verification
CNAS, or ion chromatography
Cl⁻, SO₄²⁻
Indeed,
Final Verification
Spectrometry of Atomic Absorption (AAS)
CaO, Fe2O3
Indeed,
Final Verification
Densitometer that is portable
Density of Loose Bulk
No,
First Screening
Analyser of Moisture
Ignition Loss
No,
Control of Processes
X-ray Defect Detector
Structural flaws (off-core, voids)
No,
Complete Screening
Inspection of Appearance
Deliquescence, colour, and clumping
No,
Upon receipt, the initial examination
Important Note: The legal foundation for quality release can only be reports published by organisations that have earned CNAS certification.
3. Selection Suggestions: Align the testing route with requirements
When utilised for quality arbitration or customer acceptance
MgO content, active magnesium oxide, Cl⁻, SO₄²⁻, hydrochloric acid insoluble matter, and loss on ignition are among the testing items that must be delivered to CNAS-certified organisations like Zhongxi Testing or Wuhan Kehai Inspection Co., Ltd.
If used to the control of the industrial process
To prevent batch rework, use portable equipment for daily sampling. Use a densitometer to test filling quality and an X-ray to check for structural flaws. Stop the line as soon as any irregularities are discovered.
If applied to the control of raw material procurement
Require suppliers to submit CNAS test data for every batch; conduct quick density and appearance inspections prior to warehousing to stop products that are blatantly inferior from being sold.
Experience has demonstrated that the "on-site initial screening + third-party final inspection" dual-track methodology may guaranty quality while cutting testing expenses by 40%.
