Sulfur Determination in the Analysis Sample 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 Analyzer, 5E-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

Code	Name	Mass(g)	S_{t, ad}(%)	Range	Average(%)	M_ad(%)	S_{t, d}(%)
2016071821	GBW11103j	0.2177	0.32	0.08	0.37	2.0	0.38
2016071822	GBW11103j	0.2025	0.40
2016071823	GBW11103j	0.1976	0.38
2016071824	GBW11110k	0.2095	4.42	0.01	4.42	1.7	4.50
2016071825	GBW11110k	0.1996	4.43
2016071826	GBW11110k	0.2118	4.42

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