I am having problems with the calculation of magnetic forces.

I have two magnetic coils (500 mm diameter and 200 turns) with metal core.
They are facing each other with currents (70 A) flowing in opposite directions, resulting in opposite magnetic poles. The upper coil shoud lift off the other coil. I am trying to calculate the mass the upper coil could carry. The distance between the coils would be max. 7 mm. 

![magnetic coil](https://i.stack.imgur.com/5FjR1.jpg)

I found the formula next to the picture. I took B=1,9T for the metal core in saturation. 
I neglected the distance between the coils and as a result I got 282kN as force, which seems too much.

I would like to know if the whole idea is possible and if the calculation is correct.