Dissolving Ceramic With Acid

I am a student and the sandblaster is currently being repaired so i am looking for a solution to this.

Dissolving ceramic with acid.

Molten naoh for more multiple material and for more precise stuff i use either 70 hf or the same with adding sulfuric acid and the more cruel and devastating way being molten oxone there are some disadvantages of the last. I need to dissolve ceramic shell from a bronze cast and i was wondering if there is a liquid solution available to remove the remaining shell. Elemental fluorine is produced from it. Aluminium alloy castings which are themselves susceptible to attack by caustic alkali solutions by providing the core material with a substance containing hydrogen donor group which is capable of producing nascent hydrogen and contacting the core with fused anhydrous caustic alkalis.

So we mostly used a mixture of phosphoric acid 6 wt and chromic acid 1 8 wt at 50 o c. The time depended on the. Stronger acids such as fluoroantimonic acid might be able to dissolv. A liquid free flowing flux which can dissolve the ceramic is only one part of a successful smelt albeit a big part.

Ceramic core materials are selectively dissolved from light metal e g. Aluminium or light alloy e g. It is commonly used to etch glass and silicon. Hydrofluoric acid is a solution of hydrogen fluoride hf in water solutions of hf are colourless acidic and highly corrosive it is used to make most fluorine containing compounds.

Porcelain one of the stronger ceramics won t really react with any acid except hf hydrofluoric acid as you see in breaking bad.