It is always a good idea to wear a slip on dust mask when grinding or sanding anything as the fine particles fly around.
No dust particles of anykind are good for you.
I would rather die from grinding than die from boredom.
All I know is that you can use Green coloured Silicon Carbide wheels for grinding Tungsten carbide.
The volume of a pizza of thickness 'a' and radius 'z' is given by pi z z a.