Add chlorinating agent (Cl2 A metallurgical method that converts the metal to be extracted into chloride using NaCl, CaCl2, etc., in preparation for the production of pure metals. Metals and  metal oxides, sulfides, or other compounds can mostly react with chemically active chlorine under certain conditions to form metal chlorides. Compared with other compounds of the metal, metal chlorides have the characteristics of low melting point, high volatility, easy reduction, and solubility in water and other solvents at room temperature. Moreover, there are significant differences in the generation and properties of various metal chlorides.

In metallurgy, the above characteristics are often utilized to effectively achieve the separation, enrichment, extraction, and refining of metals through chlorination metallurgy. As early as the mid-16th century, it was discovered that adding a certain amount of table salt during the leaching process of ores containing gold and silver can improve the recovery rate of metals. In the 18th century, the chlorination roasting leaching method emerged for the treatment of precious metal ores, with better results. By the mid-19th century, this method had been expanded and applied to the treatment of low -grade copper ore. This is an important development in the application of chlorinated metallurgy.

In the 1920s, in addition to being used for the extraction of magnesium, chlorination metallurgy was also used for the extraction of non-ferrous heavy metals (mainly copper) using the chlorination separation method. Since the 1950s, chloride metallurgy has been widely used in rare metal metallurgy.

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