Abstract
In this paper, we describe a progressive two-step process that allows titanium and zirconium fluorides (TiF4, ZrF4) contained in spent liquors of etched Ti and Zr alloys to be effectively recycled into CuTi and CuZr alloy compositions and a regenerated pickling acid of high purity. In the first step, spent pickling liquor is treated with a BaF2 suspension to produce water-insoluble BaTiF6 and Ba2ZrF8 fluoride salts. In the second step, the as-precipitated BaTiF6 and Ba2ZrF8 fluoride salts are mixed with Mg and Cu metals powder and heat-treated at 1300 °C to produce CuTi and CuZr alloy ingots. The microstructures of the ingots are discussed in regard to Cu concentration.
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