YS/T 820.16-2012Methods for chemical analysis of laterite nickel ores - Part 16: Determination of carbon and sulfur content - High frequency combustion with infrared absorption spectrometry (English PDF)

1 Scope

This part of YS/T 820 specifies the method for the determination of carbon and sulfur content in laterite nickel ore.

This part applies to the determination of carbon and sulfur content in laterite nickel ore. Measuring range: carbon 0.0060%~0.40%, sulfur 0.0020%~0.20%.

2 Method summary

The sample is heated and burned in the oxygen flow of the high-frequency induction furnace; the generated carbon dioxide and sulfur dioxide are carried by the oxygen to the infrared analyzer for measurement. In the measuring chamber, carbon dioxide and sulfur dioxide absorb infrared energy of a certain wavelength; the absorption energy is proportional to its concentration.

According to the change of absorption energy tested by the detector, the carbon and sulfur content can be measured.

3 Reagents and materials

Unless otherwise stated, only reagents confirmed to be analytical reagents were used in the analysis.

3.1 Pure iron fluxing agent: particle size< 1.25 mm, C< 0.0005%, S< 0.0005%.

3.2 Tungsten-tin mixed fluxing agent: the ratio is 9:1, C< 0.0010%, S< 0.0005%.

3.3 Barium carbonate shall be fine powder with a content of more than 99.9%.

Dry at 105 °C for 3 h and cool in a desiccator.

4 Instruments

High-frequency induction infrared carbon and sulfur analyzer.

The instrument shall be able to reach the following indicators:

- Power of the high-frequency furnace: 1.0 kW~2.5 kW;

- Frequency: greater than 6.0 MHz;

- Sensitivity of the detector: higher than 0.0001%.

5 Samples

The particle size of the samples shall be less than 160 µm; bake them in an oven at 105 °C~110 °C for 2 h, and cool them to room temperature in a desiccator.

6 Analysis steps