Which sort of equipment is specifically designed for flowing/pumping low density solids (powders) e.g. for loading from a drum to a receiver?
The methods are as varied as your imagination. Here's a few:
- Screw conveyor
- live bottom feed bin
- conical bin with or without agitation
- Bags (like flour) you pick up and dump
- Supersacks with tied off bottom chutes
- drum dumpers
I would expect that very common would be gravity methods combined with conveyors to get the material up so you can use gravity.