Non-Chemical Filtering techniques?

[autumnwillow]

Shark,

Rope? Is that GSP's wick technique? Already applied it.

I think the filter paper is just too thin.
There's this thick whatman filter paper but I find it too expensive for just filtering AgCl

 

[kernels]

You could try something like this -> https://www.youtube.com/watch?v=i3jYu61eLEo but it might be a pain to separate your AgCl after filtering ?

 

[Deano]

There are a lot of filter cloth suppliers on line, just type in "filter cloth".

You need a woven form of polypropylene with a thickness and weave similar to canvas, filter cloths are usually rated by volume of air passing through a fixed area of cloth.

When you cut the cloth to fit in the funnel the best way is to cut 80% of the circle and then make a tail from the other 20% so that the tail can lead up over the wall of the funnel and down most of the outer side of the wall.

This allows you to easily remove the cloth when required.

Make sure that you spend time to get the cloth circle cut so that it fits snugly against the walls of the funnel.

Cloth is usually sold by the square metre, it is fairly cheap and a square metre will last you many years.

I use them on pressure filters and get around 10 years per individual cloth when running both strong acids and alkalis through them.

Deano

 

[snoman701]

When you cut the cloth to fit in the funnel the best way is to cut 80% of the circle and then make a tail from the other 20% so that the tail can lead up over the wall of the funnel and down most of the outer side of the wall.

This allows you to easily remove the cloth when required.

Make sure that you spend time to get the cloth circle cut so that it fits snugly against the walls of the funnel.

Is there a trick to getting them to lay flat in a buchner?

I bought the filter cloth, but never could get it to lay flat, without tape.

 

[autumnwillow]

There are a lot of filter cloth suppliers on line, just type in "filter cloth".

You need a woven form of polypropylene with a thickness and weave similar to canvas, filter cloths are usually rated by volume of air passing through a fixed area of cloth.

When you cut the cloth to fit in the funnel the best way is to cut 80% of the circle and then make a tail from the other 20% so that the tail can lead up over the wall of the funnel and down most of the outer side of the wall.

This allows you to easily remove the cloth when required.

Make sure that you spend time to get the cloth circle cut so that it fits snugly against the walls of the funnel.

Cloth is usually sold by the square metre, it is fairly cheap and a square metre will last you many years.

I use them on pressure filters and get around 10 years per individual cloth when running both strong acids and alkalis through them.

Deano

I used a filter bag today and it worked well. I think I'm gonna sell this big buchner funnel and just go for pressure filtering in a filter bag.

Put all chlorides in the bag, squeeze the liquid out. Put the bag in a clean water, squeeze the liquid out until I get the same or close TDS reading as the clean water. Its more work than this buchner funnel but it can get the job done in 30 minutes. Buchner funnel with a filter paper is taking about 8 hours just to finish a 5 gallon bucket.

Where can I shop for pressure filters? I think a 10L one will serve me well.

 

[Deano]

There are many forms of filter cloth which can be used as a base for filter papers.

What you are looking for is a soft cloth with a weave and thickness similar to coarse soft canvas, this type will lay flat in the funnel without needing taping down.

Do not try the smooth sided calendered cloths, they are too stiff to lay flat properly.

Deano