“…The cylindrical glass reactor and its contents were immersed in a rectangular water bath to control the temperature (4). The cementation process using a zinc dust particles (5) of 0.7 mm in average diameter was investi- gated at experimental conditions described previously [8], i.e., the industrial solution corresponds to the average content of the main components within the following limits: Zn 160 g l −1 , Cu 200 mg l −1 , Co 10 mg l −1 , Ni 1.5 mg l −1 , Sb 0.5 mg l −1 , pH 2.5 ± 0.5. In the whole series of experiments, we have adjusted antimony content in the electrolyte to satisfy the condition that the ratio Q Co /Q Sb = 1:1 [1].…”