The purity of reworked magnesium oxide can typically reach ≥99.9%, provided that high-purity raw materials (e.g., ≥99.95%) are used and nitrogen-protected sintering and pollution control processes are strictly followed. The actual finished product should meet the industry standard of ≥95% MgO content (HG/T 3928-2012), with ≥60% active magnesium oxide.
Key Factors Affecting Final Purity
Factors | High Purity Achievement Conditions | Risk Warnings
Raw Material Purity | Use ≥99.9% high-purity magnesium oxide powder (e.g., produced by Liaoning Jiashun Technology). Low-purity raw materials directly lower the overall level.
Process Contamination Control | Cleanroom operation + high-purity nitrogen (oxygen content <100ppm) protection. Open environment operation easily introduces moisture and impurities.
Equipment Cleanliness | Purge filling and sintering equipment with high-purity nitrogen before each use. Residual contamination leads to localized purity decreases.
Detection Methods | Chemical analysis by a third-party CNAS institution (acid-base titration, etc.). Simple methods cannot accurately determine purity.
Under standardized processes, a MgO content of over 95% can be stably achieved, but it must be verified through CNAS certification testing.
Typical Reworked Purity Data Reference
|
Item |
Target Value |
Measured Range (Compliant Process) |
|
MgO Content |
≥95% |
95.2%–97.8% |
|
Active Magnesium Oxide |
≥60% |
62%–68% |
|
Cl⁻ Content |
≤0.02% |
0.012%–0.018% |
|
Fe₂O₃ Content |
≤0.05% |
0.03%–0.045% |
Data Source: Batch testing reports of reworked parts from Zhongxi Testing and Wuhan Kehai Inspection Co., Ltd. (2025–2026).
How to Ensure High Purity?
Source Control: Only use high-purity raw materials with CNAS testing reports;
Process Protection: Completely closed operation to avoid moisture absorption and cross-contamination;
