Process for treating calcium-silica-based industrial solid waste

A process for treating calcium-silica-based industrial solid waste, wherein the process comprises:

• combining the calcium-silica-based industrial solid waste with an aqueous solution comprising a metal chelating agent and water thereby forming a solid waste suspension;
• combining the solid waste suspension with an acid precursor thereby forming an electrolysis mixture;
• subjecting the electrolysis mixture to electrolysis whereby the acid precursor is oxidized in situ thereby forming an acid and at least a portion of metal ions in the calcium-silica-based industrial solid waste are extracted into the water thereby forming a first mixture comprising a metal solution comprising the at least a portion of metal ions and water and a first residue;
• separating the metal solution and the first residue;
• and
• combining the metal solution with a solution comprising a first precipitator selected from the group consisting of an alkali metal citrate, citric acid and oxalic acid and optionally a surfactant thereby forming a suspension comprising metal.