Which test is not required for evaluating the properties of coal for coke making?

Correct option is D

The correct answer is (d) Rock Eval pyrolysis. Rock Eval pyrolysis is a test used for evaluating the hydrocarbon potential of sedimentary rocks and identifying the type and maturity of organic matter. It is not used to determine the properties of coal for coke making.
Breakdown of Other Options:
1. (a) Gray King:
· A test used to determine the coking properties of coal by observing the type and shape of the coke residue left after heating.
2. (b) Swelling Number:
· Measures the ability of coal to swell and increase in volume when heated. This is crucial for assessing the coal's suitability for producing coke.
3. (c) Gieseler Plastometric Test:
· Evaluates the plasticity of coal during the heating process, providing insight into its coking behavior and the temperature range at which coal softens and re-solidifies.
4. (d) Rock Eval pyrolysis:
· Specifically designed for analyzing kerogen and hydrocarbon potential in sedimentary rocks, not for coal used in coke making.
Information Booster 1. Coke Making:
· The process of heating coal in the absence of air to produce metallurgical coke, used in blast furnaces for steel production.
2. Important Properties for Coke Making:
· Caking Ability: Coal’s ability to form a solid mass (coke) upon heating.
· Plasticity: How coal softens and swells during heating.
3. Tests for Coke Making:
· Gray King Test: Classifies coal based on its coking properties.
· Swelling Number: Assesses volume change upon heating.
· Gieseler Plastometric Test: Determines plasticity and melting behavior.
Additional Knowledge · Caking Coal: Coal that forms a solid, coherent mass (coke) upon heating.
· Non-Caking Coal: Coal that does not form a coherent mass upon heating.
· Rock Eval Pyrolysis: Used in petroleum exploration to evaluate potential oil and gas reserves in sedimentary rocks.