ASTM D5341

Determination Method for Measuring Coke Reactivity Index (CRI) and Coke Strength after Reaction (CSR)

Applicability: This procedure applies to lump coke products received or generated by Conti Testing Laboratories, Inc.
(CTL), Pittsburgh, Pennsylvania.
1.1. Summary: A sample of dried coke of designated origin and size is reacted with CO2 gas in a retort at a specified elevated temperature for a specified period of time. Two indices, coke reactivity index (CRI) and coke strength after reaction (CSR) are determined using the reacted coke residue. The weight loss after reaction determines the CRI. The weight retained after sieving the tumbled reacted coal in a designated number of revolutions over a designated turning rate determines the CSR.
1.2. Matrix or Matrices: Lump Coke
1.3. Holding Time: None.
1.4. Preservation: None.
1.5. Interferences: None.
1.6. Sample collection and shipment: No less than 125 lbs (57 kg) of sample is to be collected in plastic and unpreserved; refer to applicable field methodologies.

Purpose: When coke lumps descend into a blast furnace, they are subjected to reaction with countercurrent CO2 and to abrasion as they rub together and against the walls of the furnace. These concurrent processes physically weaken and chemically react with the coke lumps, producing an excess of fines that can decrease burden permeability and result in increased coke rates and lost hot metal production. The purpose of this procedure is to indirectly measure the behavior of coke in a blast furnace.