Hydrochloric acid is an important inorganic chemical raw material, widely used in dyes, medicines, food, printing and dyeing, leather, metallurgy and other industries. Hydrochloric acid chloride can be used to produce zinc chloride (zinc chloride is a welding medicine), can also be used to extract radium from the ore, vanadium, tungsten, manganese and other metals, made of chloride. Hydrochloric acid is also used in inorganic and organic substances in the production of drugs.