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D6374-22 – Standard Test Method Technical Guide
📐 Scope and Key Definitions
This test method, ASTM D6374-22, specifies the determination of volatile matter produced by pyrolysis when green petroleum coke is subjected to defined conditions. It is an empirical method requiring strict adherence for comparable results. The method covers materials with volatile matter concentrations from about 8% to 16%, and samples with a thermal history above 600°C are excluded. It is not satisfactory for determining de-dusting material content. Values are reported in SI units, with non-SI units in parentheses for information only.
Key terms are defined to ensure clarity. The analysis sample is a reduced and divided representative portion of the bulk sample. The analysis time is the period test samples are placed in the furnace, determined as 5 min to 10 min. Volatile matter is the mass loss on heating expressed as percent of the moisture free sample.
⚙️ Test Procedure and Apparatus
The quartz crucible procedure is employed, with furnace conditions precisely controlled. The analysis time must be between 5 and 10 minutes. Referenced documents include Specification E11 for woven wire test sieve cloth and test sieves, and Test Method E220 for calibration of thermocouples.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Analysis Time | 5 to 10 minutes |
| Volatile Matter Range | 8% to 16% |
| Thermal History Limit | Below 600°C |
| Unit System | SI units standard |
⚠️ Exclude any sample that has been subject to thermal history above 600°C to ensure accurate volatile matter determination.
💡 Closely follow the entire test procedure as described in the standard to achieve consistent and comparable results between laboratories.
📊 Precision and Important Notes
The interlaboratory study for this test method covered volatile matter concentrations from 8% to 16%. Precision data have been established for this range. This test method is empirical, and any deviation from specified conditions may affect results. Safety precautions should be observed as per the user’s responsibility, and regulatory limitations should be considered prior to use.
❓ Frequently Asked Questions
🔍 What is volatile matter in green petroleum coke? Volatile matter is the mass loss on heating under the test conditions, expressed as a percentage of the moisture-free sample. It indicates the amount of pyrolyzable material.
💡 What is the analysis time for the quartz crucible procedure? The analysis time is the duration test samples are placed in the furnace, calculated as specified and typically ranging from 5 to 10 minutes.
⚡ Why are samples with thermal history above 600°C excluded? Samples with higher thermal history have already undergone significant volatilization, which would bias the volatile matter results. The method is designed for raw petroleum coke.
📌 Can this test method be used for de-dusting materials? No, this test method is not satisfactory for determining de-dusting material content as it focuses on volatile matter from pyrolysis under specific conditions.