The metallurgical method of adding chlorinating agents (Cl2, NaCl, CaCl2, etc.) to convert the metal to be extracted into chlorides in preparation for the production of pure metals. Most metals and metal oxides, sulphides or other compounds can react with chemically active chlorine under certain conditions to produce metal chlorides. Compared with other compounds of the metal, metal chloride has a low melting point, high volatility, easy to be reduced, easily soluble in water and other solvents at room temperature, etc., and the generation of various metal chlorides and the nature of the ease of obvious differences.

In metallurgy, often use the above characteristics, with the help of chlorinated metallurgy to effectively achieve the separation of metals, enrichment, extraction and refining and other purposes. As early as in the middle of the 16th century, it was found that adding a certain amount of salt in the process of leaching ores containing gold and silver could improve the recovery rate of the metals, and in the 18th century, the chlorinated roasting-leaching method appeared to deal with the ores of precious metals, which was even more effective. By the middle of the 19th century, this method was expanded to treat low-grade copper ores.

This is an important development in the application of chlorinated metallurgy. In the 1920s, chlorinated metallurgy was not only applied to the extraction of magnesium, but also used in the extraction of non-ferrous heavy metals (mainly copper) by the method of chlorine dissociation.Since the 1950s, chlorinated metallurgy has been widely used in the metallurgy of rare metals.

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