Dmishin - 17-4-2016 at 06:11
I would like to proudly present you the construction I built for filtering under pressure. Its features:
Filter 50...1500 ml of solution
Separate reasonably fast even very bulky sediments like CaSO4.xH2O
Near-zero cost, made literally from garbage
Requires no supervision
Disadvantages: only suits well when desired compound is in the filtrate, because caked sediment remains in the bottle and not easy to extract.
First of all, an overall view of the assembly, filtering 700ml of MnSO4 solution (obtaining manganese from used batteries).
Parts
Short hard plastic tube (ink refill of a gel pen)
Stripe of rubber (bicycle inner tube)
PET bottle with cap
Long tube of some softer plastic (PVC?). The only part that is not a garbage.
Plastic syringe.
Piece of a synthetic tissue.
Harder plastic tubes that fit inside the long one (stems of cotton swabs). Used as stents.
Assembly
Pierce 2 holes in the bottle cap, so that tubes (short and long) fit in them tightly.
Assemble valve from peice of rubber and short plastic tube.
assemble filter head from piece of syringe (piece of plunger is put inside for rigidness). Filter is made of 2 layers of synthetic tissue with
filtering paper between them.
Pass long tube through the hole, and put plastic stents (smaller tubes of hard plastic) inside the part that would be inside the bottle. They are
needed to prevent collapse of the tube under pressure.
Operation
Use bicycle hand pump to create pressure inside the bottle.
