If it's threaded, yes. Fittings are usually difficult to remove because of rust and build-up on threads.
You use a 'Robar' fitting, which is essentially a rubber sleeve with large hose clamps to tighten it.
Hit it with a sledge hammer.
Where? What is your question?
Loosen the clamps and use some elbow grease to twist the fitting into the desired position.
A cast fitting that is shaped like a TEE and used either for drainage or venting
By cutting in a cast iron Wye so the flow enters the sewer line (soil pipe) at a right angle
NO you cannot heat as any flame can cause a severe explosion and the very least crack the CI fitting The threads have to be cut out gently and possibly re tapped
Term used with cast-iron, PVC, CPVC and ABS pipe. Cast-Iron; The plain end of a cast-iron pipe. The spigot is inserted into the bell end of the next pipe to make a water tight joint. PVC, CPVC or ABS; A male end of a fitting the same size as the pipe that is inserted into the slip (hub) end of a fitting.
from the hub to the spigot
With a compression mission ring
A dutch oven is a large cast iron cooking pot with a tight fitting lid we would commonly refer to them as casserole dishes. A cast iron dutch oven is therefore totally different to an oven.
Galvanized pipe for water and drain lines. Cast iron pipe for main drain lines.