Activated Charcoal Binder

Hello kamlesh petel,

This is a question brought up when you asked about a pill making machine. There was some on that post who offered to tell you what to use. Why did you dot take his offer to help?

I will look into it and if yiu are really lucky the same person will get back to you anf help.

Take care

At 350º C you out of the scene for organic binders unless you use silicone base.

Try cementitious - Plaster of Paris, a fine cement or sodium silicate - which should be cured by injection of CO₂ as used in foundries.

Try water glass. It is a aluminum silicate product that will handle elevated temperatures. One to three percent by volume should do the trick.

Water Glass is sodium silicate!

Stand correctded...thanks. I had Aluminum on the brain all morning!

Hello NiCrMoNoMore:

I had Aluminum on the brain all morning!

Try wearing a felt hat, much less cruel to da 'bonce'!

Take care............

Depending on what temperatures and chemicals you need to handle, it can be bonded with tar which is then heated to about 1000C+ in the absence of air.

This is a fairly expensive process but the result is inert to all except oxidizing chemicals and will withstand extremely high temperatures, although the bond is fairly brittle, but then so is sodium silicate.

Na2SiO4 is resistant to all acids except HF but is attacked by strong alkalis.

A Carbon bond is inert to virtually anything (except oxidation).

Whoops.

Don't use tar !! it is a thermoplastic and would probably break down (by oxidation) at high temperatures. It is used in water resistant epoxy coatings but does not react - it is purely mixed in. cuts the cost, helps the film build and is very water resistant - you can have any colour you like (as per Henry Ford) so long as it is black.

For the nit pickers aluminium paste can be added - (note we pommies never give up.)

The inert aspect of carbon scares me as we all rely on decomposing and recomposing its compounds!!

So Mr. Hazman Does sodium silicate would appropriate to me ? & if you have more information please tell me.

I believe it will. This is a technique used for binding sand together for making moulds for hot metal casting. It should bind the particles and is relatively inert once cured. The method is to mix the sand, silicate and water then carbon dioxide is injected into the mass using very slim probes which cures it. Residual water can easily be removed by heating. You will probably need some water to get an even mix and the least amount of silicate to give you the biscuit you need.

If tar is used, it needs to be contained in a mold when being pyrolised. this is a process used to make carbon anodes and other carbon shapes.

It is not much use as a binder without pyrolysis to reduce it to carbon.

As mentioned earlier, it is not resistant to oxidation, but at high temps (over 1000C or so), the rate of oxidation is less than, say Fe or many similar materials.

I would only use it if the activated C needed to be regenerated at high temp -say 500C or more.

This sort of temp can be used to rejuvenate materials like coconut carbon. They can be desorbed at considerably lower temperatures.

Sodium silicate can be cured by slow heating at just below 100C. It forms a closed cell foam fairly readily if heated rapidly above this until it is almost completely dewatered. Temp is then raised to around 550C (ie about the melting point) to produce glass bonding between the particles. I'm not sure if this would cover sufficient pores in the activated carbon to reduce it's adsorption capabilities significantly.

The resultant bonded item is quite resistant to acid conditions, somewhat susceptible to alkali although weak alkali has little effect.

Usable temp is about that of the melting point of sodium silicate.