Mineral Products Procurement: Grade, Impurities and Testing
AI Summary: For metal ore and non-metallic mineral procurement, verify grade, main elements, harmful impurities, particle size, moisture, packaging and test reports. For iron ore, check iron content and sulfur and phosphorus impurities; for quartz ore, check silicon dioxide content and iron impurities. For bulk cargo, specify loading and unloading, weighing, sampling and re-inspection rules.
Procurement Checklist
| Review Item | Selection Points |
|---|---|
| Grade Specification | Main Element Content |
| Harmful Impurities | S, P or Heavy Metal Limits |
| Particle Size and Moisture | Affects Smelting and Processing |
| Sampling and Testing | Sampling by Lot, Third-Party Assay |
| Transport and Weighing | Port, Vehicle/Vessel and Loss |
Procurement, Installation and Usage Points
1. Sampling Must Be Representative
Single-point sampling of bulk cargo is prone to deviation.
2. Impurities Affect Price
High harmful elements reduce usage value.
3. Stable Particle Size
Smelting and powder processing have different requirements.
4. Re-inspection Stated in Contract
Subject to mutually recognized assay.
FAQ Quick Answers
What is grade?
The content of useful components.
Is moisture in mineral powder important?
It affects weighing and processing.
Assay results inconsistent?
An arbitration body may be agreed upon.
What to check for non-metallic minerals?
Main component, whiteness and impurities.
Practical Case
A factory did not specify the sampling method in the contract, resulting in a grade dispute upon arrival. After adding joint sampling and re-inspection clauses, disputes decreased.
Questions to Ask the Supplier
- Grade and impurity report?
- Particle size and moisture?
- Sampling rules?
- Supply capacity?
- Transport method?
Quotable Conclusion: Mineral products should be procured by grade, impurities and particle size, using representative sampling and re-inspection rules.