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Pumping tarry liquids is hard. The tars are sticky and foul pumps. Here's some ideas for how to solve the problem from a discussion on the gasification list awhie back.
- Peristaltic Pumps
http://www.novatech-usa.com/Products/VSP-Peristaltic-Pumps-Parts/VSP12
- Pneumatic transport with venturi inlet uptake. like a paint spray gun.
- Pneumatic rising column. Pump air in bottom of pipe that is submerged in the liquid. Air plugs will rise pulling/pushing liquid upwards.
- Dishwaster Recirculation Pumps
washing machine drain pumps are designed to handle lumpy water. The
a slurry of corn, peanut butter, oils, oatmeal, water and soap for six
months. They are rated at 80 deg C but I've done two year tests of the
same slurry at 95-98 deg C with no problems. The ones with wet rotors
seem to last longer. They cost about 12-20 dollars and if you've got
an old washer sitting around they are free. Hope this helps.
- Progressive cavity pumps
- Tesla Turbine Pump. Didn't Tesla solve all problems . . . ?
- Hot Air Pump
http://www.iedu.com/DeSoto/Projects/Stirling/Pump.html