I've used progressing cavity pumps and screw conveyors in the past. Both worked fine. Materials 321 SS, nitrile rubber for the PC pump, SS for the conveyor.
Peristaltic positive displacement pumps should handle the job fine.
Materials as per previous post.
Be careful with your dosing lines as the slurry is very abbrasive. We are installing PVC pipes with SS bends on the project I am currently commissioning.