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D5159-21 – Standard Test Method Technical Guide
📐 Test Overview and Key Concepts
This guide presents a procedure for evaluating the resistance to dusting attrition of granular activated carbons. The dust attrition coefficient (DA) is defined as the weight of dust per unit time collected on a preweighed filter in a vibrating device per unit weight of carbon. The initial dust content of the sample may also be determined. Granular activated carbon must have a minimum of 90% larger than 80 mesh (0.18 mm). The test assesses attrition from friction forces between particles.
| 🟦 Parameter | 📏 Specification |
|---|---|
| RMS Acceleration | 40 m/s/s (4 g) |
| Test Intervals | Six 10-minute intervals |
| Sample Mesh Size | >80 mesh (0.18 mm) |
| Apparatus Material | Aluminum or conductive material |
⚙️ Test Procedure and Apparatus Setup
A known volume and weight of granular activated carbon is placed in a test cell and vibrated at constant acceleration. The apparatus includes a vibrating table providing 40 m/s/s RMS acceleration, a piezoelectric accelerometer, and a signal conditioner. Dust is carried by an air stream through the vibrating sample and collected on a preweighed filter. Dust collected in six 10-minute intervals is weighed on an analytical balance to determine the DA.
⚠️ Important: Use an electrically conductive test cell (e.g., aluminum) to prevent static charge buildup that can alter dust collection efficiency.
📊 Significance and Measured Properties
Three forces degrade activated carbon: impact, crushing, and attrition. This guide focuses on attrition, the most common cause of dust formation in service. The method measures friction forces between particles and may be less dependent on particle size and shape compared to other tests. The DA value indicates resistance to dusting under controlled vibration conditions.
❓ Frequently Asked Questions
🔍 What does the dust attrition coefficient (DA) represent?
DA is the weight of dust generated per unit time per unit weight of carbon under specified vibration, quantifying resistance to attrition from friction.
💡 How is the test sample specified?
Sample must be granular activated carbon with at least 90% larger than 80 mesh (0.18 mm). A known volume and weight is used for the test.
⚡ What apparatus is required?
Essential equipment includes a vibrating table with controlled RMS acceleration, a test cell, a piezoelectric accelerometer, a signal conditioner, and an analytical balance.
📌 Why are six test cycles performed?
Collecting dust in six consecutive 10-minute intervals allows assessment of dust generation over time, providing insight into attrition behavior.