Case Study

Sulfur Determination in the Analysis of Coal and Coke

Sample Preparation
Crush & Grind the sample to size ≤ 0.2(GB) / 0.212(ISO) / 0.25mm(ASTM)  Air dried
Moisture should be tested by oven or TGA in case of calculating St,d

Instrument
5E-IRS3600 Automatic Infrared Sulfur Analyzer5E-IRSII Infrared Sulfur Analyzer

Instrument Settings
Combustion chamber temp. :1350℃
Constant Oven: 48 ±1℃
Oxygen: Purity 99.5%
Pressure: (0.25 ± 0.01) MPa
Flow: (4.0 ± 0.2) L/min
Air Extracting Pump: 2.5L/min Calibration Standard: ASTM D4239
Nominal Sample Weight: 200mg Analysis Time: 120s

Special Modifications to Unit
None

Method Approval
GB/T 25214, ASTM D4239, ISO19579

Procedure
1. Prepare instrument as outlined in the operator’s instruction manual ( Routine check for temp. stability, gas leak test, etc.)
2. Purge the gas system for 10mins
3. (1-2) waste samples to condition the instrument
4. Run analysis for 1-2 standards sample for verifying the accuracy
5. Test 10-15 samples
6. 1-2 samples of calibration substance for verification (do drift correction if necessary)
7. Repetition of point 5 to point 6 until all samples are processed

Note
Do Calibrating refer to operator’s instruction manual for details.

Typical Results

CodeNameMass(g)St, ad(%)RangeAverage(%)Mad(%)St, d(%)
2016071821GBW11103j0.21770.320.080.372.00.38
2016071822GBW11103j0.20250.40
2016071823GBW11103j0.19760.38
2016071824GBW11110k0.20954.420.014.421.74.50
2016071825GBW11110k0.19964.43
2016071826GBW11110k0.21184.42