Ore leaching is classified into chemical leaching and microbial leaching. Chemical leaching relies on the selective combination of chemical reagents and various components in the ore, so that the elements or components can be leached into the solution, while the components that are not leached, such as gangue, remains in the residue, and then the solution and the residue is separated to achieve the purpose of purification separation after the process of being filtered and washed.

    Leaching technology can be divided according to the solvent immersion into acid leaching (hydrochloric acid, sulfuric acid, nitrate acid, etc.) and alkali leaching (sodium hydroxide, sodium carbonate, sodium sulfide, ammonia etc.); the techniques on behalf of pressure can be divided into atmospheric leaching (atmospheric pressure) and high-pressure leaching. According to leaching methods it can be divided into filtered leaching (site leaching, heap leaching and pool leaching) and stirred leaching.