DUST CONTROL MATERIAL ON CALCINED PETROLEUM COKE: ASTM D4930
EXPLANATION
The dust control material is applied to calcined coke to help maintain a dust free environment. It adds weight to the coke and can have a negative effect on the quality of carbon and graphite artifacts made from the treated coke. Hence, the coke customer is interested in the amount of it in coke, and may specify a maximum level. This test method is limited to those materials that are soluble in a solvent (for example, methylene chloride) that can be used in a Soxhlet extraction type of apparatus. Toluene and methyl chloroform have also been found to give equal results as methylene chloride.
TEST SUMMARY
From a weighed dry representative sample of 6.3 mm of maximum sized coke, the dust control material is dissolved by methylene chloride in a Soxhlet apparatus. The mass of the residue remaining after extraction and evaporation of the solvent is the mass of the dust control material.
TEST PRECISION
The precision of this test is dependent on the absolute amount of oil on the coke as well as the efficiency of sampling and riffling procedure used. A repeatability of 0.04 and a reproducibility of 0.15 has been found.
This is an empirical test and no statement about bias can be made.
