How can I remove silicates from graphite?

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Frank Kern

this depends on the amount of material in total the required final purity and the effort you want to put into it.

For small amounts of material you can dissolve the silica in HF, hereby you can get rid of the silica completely the rest of the silicates will dissolve in other acids.

To be honest, not a very elegant way, requires adequate safety precautions and is not feasible for larger quantities.

At the large scale this can be done by milling and flotation techniques, here some residual silicates will persist, which may then be dissolved in HF.

You may find some further information in Ullmanns Encyclopedia of technical chemistry.

Moulay Tahar Sougrati

Thank you Frank,

I will try the flotation method. For HF I agree with you, It is to avoid.

Thanks again