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50. What is the main component of the dry process solvent?

The commonly used "dry method" solvents mainly consist of the following components: (1) Hydrochloric acid (HCl) with a concentration of 31% (360 g/L, Boehme degree above 19) or higher is directly used as the solvent; (2) A zinc chloride (ZnCl₂) aqueous solution is used as the solvent; (3) An ammonium chloride (NH₄Cl) aqueous solution is used as the solvent; (4) A double salt aqueous solution of ammonium chloride and zinc chloride is used as the solvent.
The main solvent used in hot-dip galvanized steel pipe factory in China is the compound salt solution of ammonium chloride and zinc chloride.