Question

Which of the following should be present in least amount, so as to give a good metallurgical coke?

(a) Ash content

(b) Moisture content

(c) Volatile matter

(d) Sulphur and phosphorous content

I have been asked this question in exam.

Enquiry is from Secondary Solid Fuels topic in portion Fuels and Combustion of Engineering Chemistry II

Answer 1

Correct choice is (d) Sulphur and phosphorous content

For explanation: Sulphur and phosphorous content in the coke can contaminate the metal and adversely affect its properties. They tend to make the metal brittle. Sulphur content should note be less than 0.5% and phosphorous 0.1%. Moisture should be less than 4% and ash content less than 6%.