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Coal & Coke

Carbon Hydrogen Nitrogen Determination in 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 dry basis value

Instrument
5E-CHN2200 Elemental Analyzer

Instrument Settings

Oxygen Flow (SV4): 3L/min; 

Oxygen Flow (SV5): 0.8L/min; 

Oxygen Flow (SV6): 0.3L/min;

Main Furnace Temperature: 950 ℃; 

Secondly Furnace Temperature: 850 ℃ 

Nominal Sample Weight: 80 mg;

Analysis Time: 6 minutes per analysis;


Special Modifications to Unit
None


Method Approval
GB/T 30733 ASTM D5373 AS 1038.6.4 ISO 29541


Procedure

1. Prepare instrument as outlined in the operator’s instruction manual (perform maintenance and leak checks, etc.);

2. Purging and analyze blanks until instrument is stable (nitrogen results will reach a plateau);

3. Calibrate by CRM EDTA;

4. (4-5) blanks and (1-2) waste samples to condition the instrument
5. 3 samples of calibration substance to check or carry out the calibration;

6. Run 9 sample analyses

7. 2 samples of calibration substance to check the calibration;

8. 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) Cd(%) Hd(%) Nd(%)
1 Coal 1 0.0801 82.98 4.27 1.80
2 Coal 1 0.0816 82.93 4.20 1.76
3 Coke 3 0.0792 90.43 4.03 0.95
4 Coke 3 0.0813 90.54 3.96 1.01

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