ASTM E1805 Optical Filter Radiometry Testing for Solar Applications
The ASTM E1850-21 test method determines gold in copper concentrates in the content range from 0.2 μg/g to 17 μg/g. In this method the test sample of copper concentrate is fluxed and fused in a clay crucible. The precious metals are reduced, collected in a lead button, and then cupelled to remove the lead. The remaining Dore bead is parted with nitric acid to remove the silver and other impurities from the gold. The gold is then annealed, cleaned, and weighed on a microbalance.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Overview
ASTM E1805-21 provides a test method for determining the gold content in copper concentrates using fire assay followed by gravimetric measurement. Copper concentrates often contain trace amounts of gold, and accurate determination is essential for valuation and process control.
This standard is widely used in mining and metallurgical industries to ensure precise quantification of gold during extraction and refining operations.
Scope, Applications, and Benefits
Scope
ASTM E1805-21 focuses on measuring gold content in copper concentrates using fire assay techniques. It ensures accurate separation and quantification of gold from complex matrices.
The test evaluates:
- Gold concentration in copper concentrates
- Recovery efficiency
- Accuracy of metallurgical processes
- Material composition
- Compliance with specifications
Applications
- Mining and mineral processing
- Copper concentrate analysis
- Metallurgical laboratories
- Precious metal recovery
- Quality control and valuation
Benefits
- Provides highly accurate gold measurement
- Supports process optimization
- Improves recovery efficiency
- Enables reliable valuation of concentrates
- Ensures consistency in analysis
Test Process
Sample Preparation
Copper concentrate sample is dried and weighed.
1Fire Assay Fusion
Sample is fused with fluxes to separate precious metals.
2Cupellation
Impurities are removed to obtain a metal bead.
3Data Recording & Evaluation
Gold content is determined gravimetrically.
4Technical Specifications
| Parameter | Details |
|---|---|
| Applicable Materials | Copper concentrates |
| Fusion Temperature | Typically 1000°C to 1100°C |
| Flux Composition | Lead oxide-based flux |
| Measurement Unit | g/t (grams per tonne) or ppm |
| Measured Outputs | Gold content |
Instrumentation Used for Testing
- High-temperature furnace
- Crucibles and cupels
- Analytical balance
- Flux materials
- Sample preparation tools
- Data acquisition system
Results and Deliverables
- Gold concentration (g/t or ppm)
- Assay report
- Recovery efficiency analysis
- Test condition summary
- ASTM compliance report
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Frequently Asked Questions
ASTM E1805-21 is a standard test method used to determine gold content in copper concentrates using fire assay gravimetry for accurate metallurgical analysis.
ASTM E1805-21 is important because precise gold measurement helps optimize extraction processes, evaluate ore quality, and ensure economic efficiency in mining operations.
ASTM E1805-21 involves fusing the sample to collect gold in a metallic bead, followed by separation and weighing to quantify gold content accurately.
ASTM E1805-21 requires furnaces, crucibles, cupellation equipment, analytical balances, and reagents for conducting fire assay and gravimetric analysis.
Results are reported as gold concentration, typically in grams per ton or ppm, helping assess ore value and guide metallurgical processing decisions.
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