Activated carbon Ashing

[Barstool miner]

For practical purposes most people ash at 600 - 650C overnight in an electric muffle furnace, using a gas fired furnace will lead to losses due to the light ash blowing out the furnace exhaust.

The most important aspect of ashing is the depth of the carbon bed, if it is deeper than around 1 cm you will blanket the carbon with ash and the reaction will need rabbling of the bed at intervals to get complete ashing.

The door of the furnace is cracked open about 1 cm to allow the air access needed for ashing to proceed.

Always best to use coarse piece activated carbon as per what the gold industry uses, fine powder type carbon will adsorb gold quickly but is very prone to blanketing during ashing.

Asking is usually done in 316 ss trays with edge turn ups of around 1 cm.

You can layer the trays keeping about 40mm spaces between trays, use 25mm ss tube lengths as spacers at each corner of the trays.

Deano

Hello Deano, Where can I get the details of your Pyrolization vessel?

 

[Yggdrasil]

Hello Deano, Where can I get the details of your Pyrolization vessel?

This is not pyrolizing, but ashing.
Two different animals.

 

[Barstool miner]

This is not pyrolizing, but ashing.
Two different animals.

I apologise, you are correct. Thank you for correcting me. I am trying to communicate with the member that explained about using SS vessels to Ash Activated Carbon

 

[kumbirai.mhere]

Hi
I have access to about 5 tons of spent activated carbons a month. I would like some ideas how l can ash a decent volume. Say around 200 to 250kgs at a time. I would like to purchase a commercial furnace set up but my budget won't allow it. I will be using Cyanide leaching to process ash.

What l would like to know
Any ideas on building and designing an ashing oven to do 250kgs plus at a time.
Something that can be built at a diy level.

Regards
Arwzim

Hi I am in Zim can we link

 

[Barstool miner]

This is not pyrolizing, but ashing.
Two different animals.

thank you for the info, Yggdrasil. But I do want to Check out the pyrolyzing vessel. I used a pottery Kiln For my Activated Carbon Ashing. One could also Use a Pizza oven to ash activated carbon, It just takes a little Imagination.

 

[Yggdrasil]

thank you for the info, Yggdrasil. But I do want to Check out the pyrolyzing vessel. I used a pottery Kiln For my Activated Carbon Ashing. One could also Use a Pizza oven to ash activated carbon, It just takes a little Imagination.

Do a pizza oven get hot enough?
Some 600C is needed for proper ashing and trays with no more then 1-2 cm depth.

Pyrolizing ==> No oxygen
Ashing ==> Plenty oxygen