ASTM D6791 Test Method for Determination of Grain Stability of Calcined Petroleum Coke
1. Scope
1.1 This test method covers a laboratory vibration mill method for the determination of the grain stability of calcined petroleum coke for the manufacture of carbon products used in the smelting of aluminum. Calcined petroleum coke with poor mechanical strength may become degraded during mixing. Poor grain stability will affect the grain size and may result in poor quality of baked blocks.
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.
2. Referenced Documents
2.1 ASTM Standards:
D346 Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
D2013 Practice for Preparing Coal Samples for Analysis
D2234/D2234M Practice for Collection of a Gross Sample of Coal
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
2.2 ISO Standard:
ISO 6375 Carbonaceous Materials for the Production of Aluminum - Coke for Electrodes - Sampling
3. Terminology
3.1 Definitions:
3.1.1 calcined petroleum coke, n - petroleum coke that has been thermally treated to drive off the volatile matter and to develop crystalline structure.
3.1.2 petroleum coke, n - solid, carbonaceous residue produced by thermal decomposition of heavy petroleum fractions, or cracked stocks, or both.
