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Non-Ferrous Zinc
Zinc Dross
Grade: Scrub/SealLow-Medium Tier
Galvanizer zinc dross and skimmings
Market Price EstimateUpdated Daily
$1,450/ MT
+45 (3.2%)vs yesterday
Verified specifications & market data
Chemical Composition
Elemental breakdown by percentage weight.
Standard composition limits
Values represent maximum allowed percentage unless otherwise noted.
Physical Properties
Material form, density, and contamination specifications.
Galvanizing process waste; hot-dip galvanizing bath dross and skimmings; zinc/iron oxide composite; industrial galvanizing facility waste stream; requires processing and roasting for zinc recovery; established zinc waste recycling infrastructure
Acceptable Inclusions
- Zinc 85-95% (dross specification)
- Iron oxide <10% (galvanizing bath residue)
- Aluminum <3% (bath additives)
- Iron <8% (metal interaction)
- Moisture <2% (post-drying)
- Ash/oxides <5% (process residue)
- Lead <1% (legacy contamination trace)
- Cadmium <0.1% (hazmat trace)
Prohibited Materials
- Zinc <85% (below dross specification)
- Iron >8% (excessive contamination)
- Cadmium >0.1% (exceeds hazmat limit)
- Heavy contamination or unknown materials
- Radioactive or hazardous materials
- Organic contamination or oils
Quality Assurance
Testing protocols, sampling methods, and acceptance criteria.
Sampling Protocol
frequencyRandom stratified sampling from multiple dross batches/collection points; galvanizing source variation assessment
maximumQuantity100-150 samples per shipment
minimumQuantity0.5-1 tonne or 40-80 sample portions
percentage8-12% of lot
stratificationSample across different dross batch ages; oxide content variation; iron oxide distribution; cadmium screening comprehensive
Acceptance Limits
all Criteria Must PassMaterial must be dross; zinc 85-95%; hazmat cadmium <0.1%; moisture <2%
aluminum LimitAl <3%
cadmium LimitCd <0.1%
composite CharacteristicOxide-rich dross form confirmed; galvanizing waste authentic
iron Metal LimitFe <8%
iron Oxide LimitIron oxide <10%
material IdentityConfirmed as zinc dross
moisture LimitMoisture <2%
zinc ContentZn 85-95%
Weight Tolerance
measurementVerified by certified scale; weight accountability for commodity waste
variance±4% from purchase order weight
Required Test Methods
Visual Inspection & Dross Confirmation
Purpose
- Confirm zinc dross (NOT ferrous slag
- NOT other waste)
- verify oxide-rich gray-white form
- assess drying condition
Acceptance Criteria
- Zinc dross unmistakable gray-white oxide appearance
- loose or compacted particles
- galvanizing waste characteristic confirmed
Procedure
- 100% visual
- verify dross color/form
- confirm oxide-rich appearance
- exclude ferrous slag
- assess moisture/drying condition
Magnetic Test
Purpose
- Assess ferrous content
- verify zinc oxide dominance over magnetic iron
Acceptance Criteria
- Non-magnetic or minimal magnetic response
- zinc oxide dominance confirmed
- iron metal <8%
Procedure
- Magnet test
- evaluate iron oxide (non-magnetic) vs. magnetic iron content
- confirm dross character
Moisture Assessment
Purpose
- Evaluate moisture content
- verify drying condition
- assess post-drying acceptability
Acceptance Criteria
- Moisture <2%
- acceptable post-drying condition
- drying protocol effective
Procedure
- Loss on ignition or moisture analyzer
- verify drying completion
- assess moisture level
Cadmium Screening
CRITICAL
Purpose
- detect cadmium
- assess occupational health risk
- worker protection assessment
Acceptance Criteria
- Cadmium <0.1%
- hazmat acceptable
- occupational safety protocols sufficient
Iron Oxide & Composite Assessment
Purpose
- Evaluate iron oxide content
- assess oxide-rich dross characteristic
- verify galvanizing residue typical
Acceptance Criteria
- Iron oxide <10% confirmed
- iron metal <8%
- composite dross form verified
Procedure
- XRF spectrometry
- iron quantification (oxide vs. metal)
- composite assessment
- galvanizing characteristic confirmed
XRF Spectrometry
Purpose
- Verify Zn 85-95%
- quantify iron oxide, aluminum, cadmium
- confirm Scrub/Seal specification
Acceptance Criteria
- Zn 85-95%, Fe-oxide <10%, Fe-metal <8%, Al <3%, Cd <0.1%