The Essentia Smeltery is a block added by Thaumcraft 6. It is used to disassemble items and blocks into their aspects. It will eject aspects into Arcane Alembics above it. It operates at 80% efficiency; roughly 20% of smelted essentia will dissipate as Flux into the air; this can be reduced by attaching Auxillary Venting Ports to the Smeltery.
I have drawn up the plans for an Essentia Smelter. The smelter works much like a normal furnace by burning coal to produce heat, but instead of smelting ore into metal, it breaks down objects into a slurry of raw, unprocessed essentia. This process isn't very efficient and a small amount of essentia is converted into flux roughly 20% of the time. The next step in the process is to take the essentia slurry and distill it using an Arcane Alembic. To work, arcane alembics need to be placed on top of a smelter. Multiple alembics can be placed on top of each other to increase storage, but it does not influence processing speed. The essentia slurry will slowly be drawn into the alembic and the individual aspected essentia separated out. If the smelter is being powered by alumentum, this distillation process is much faster. The essentia can then be extracted out of an alembic using phials, jars or more complex means.