Gold in limestone | Gold Refining & Metal Extraction Forum
Sulphuric acid isn't recommended for treatment of lime stone. CaCO 3 + H 2 SO 4 => CaSO 4 + H 2 O + CO 2. CaSO 4 is the formula for gypsum and isn't soluble in water, you would create a mess. I would recommend HCl for dissolving limestone. It gives CaCl 2 that is water soluble.