Abstract
Despite the fact that halides have been used extensively for many years, for instance for producing sodium, lithium, calcium, and magnesium by fusion electrolysis of their chlorides, and aluminium from a fluoride bath, the metallurgist is not readily inclined to work with halides, especially chlorides, in high-temperature processes, mainly on account of the corrosion problems that arise. Some new corrosion resistant materials, now available, have somewhat eased the situation, but the considerable expansion that has taken place recently in the use of anhydrous chlorides by the metallurgist must be attributed mainly to a reduction in the price of chlorine and to the fact that no alternative method could be found for the production of certain oxygen-sensitive metals (titanium and zirconium). Progress has also been achieved with the use of fluorides, which can be made at much lower cost from the cheap anhydrous HF now available. Much of the information in this review supplements that in a previous publication by the author.
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