Carbon-bonded MgO refractories

Question 1

What is pitch?

Answer 1

~ generated from coal tar or petroleum residue

~ mixed with dead burned MgO and heated to 100C to soften pitch

Question 2

How are carbon bonded refractories made?

Answer 2

~ bricks are pressed and then heated to 400C to PYROLYZE the pitch (volatize and leave a graphite residue)

~ pyrolized bricks are assembled into a furnace structure and fired in-situ

Question 3

What is pitch used for?

Answer 3

~ a BINDER for a mix of graphite flakes and dead burned MgO