What kind of ant is orange and black?

I believe what your are describing is actually a wingless wasp, often called 'cattle ants', 'cow ants', or 'velvet ants'. They are actually in the wasp family and vary in color from red to orange to yellow, one way to tell they are a wasp and not an ant is that they are 'hairy' and much larger then any typical ant (this answer assumes you live in the US).