Removal of salts from granite by sepiolite

A study has been carried out on the extraction of salts from different types of granite using patent sepiolite formulation. The ability to remove salts greatly depends on the mineralogical compositions of the granites. Two types of equilibria are important: the absorption and/or adsorption of salts on the stone, and the partition of ions constituting the salt in the adsorbed state between the clay minerals in the rocks and that used as an extracting agent.