Carbon Hydrogen Nitrogen Determination in Coal and Coke | Application

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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