Significance and Use

The real density of calcined petroleum coke directly influences the physical and chemical properties of the manufactured carbon and graphite artifacts for which it is used. Density, therefore, is a major quality specification of calcined petroleum coke and is used as a control in coke calcination.

Referenced Documents

ASTM Standards:

D4930 Test Method for Dust Control Material on Calcined Petroleum Coke

D6969 Practice for Preparation of Calcined Petroleum Coke Samples for Analysis

D6970 Practice for Collection of Calcined Petroleum Coke Samples for Analysis

E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves

E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

Scope

1.1 This test method covers the determination of the real density (RD) of calcined petroleum coke. Real density, by definition is obtained when the particle size of the specimen is smaller than 75 microns (No. 200 Sieve).

1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Summary of Test Method

A representative sample of calcined petroleum coke is dried and ground to pass a 75 μm (200-mesh) screen. The mass of the sample is determined directly and the volume derived by the volume of helium displaced when the sample is introduced into a helium pycnometer. The ratio of the mass of the sample to the volume is reported as the real density.

Apparatus

7.1 Analytical Balance, accurate to 60.1 mg.

7.2 Desiccator.

7.3 Drying Oven, preferably a vacuum oven, for temperature to 120 °C.

7.4 Helium Pycnometer:

7.5 Jaw Crusher and Roll Crusher—Other style crushers which allow control over particle size without contamination are acceptable.

7.6 Rifflers, with hoppers and closures.

7.7 Wire Sieve, 75 μm (U.S. No. 200 mesh), meeting Specification E11.

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