Abstract
Rates of dissolution of rotating zinc cylinders in hydrochloric acid were measured by the weight loss technique. Hydrochloric acid concentration and rotational speeds were in the range 0.5 – 0.85 M and 300 – 2800 rev min -1 (11 – 103 cm s -1 respectively. Within the range 300 – 2000 rev min -1 (11 – 73 cm s -1) the rate of dissolution was found to increase with rotational speed; the mass transfer coefficient of zinc dissolution was related to the rotational speed by the equation K = constant ω 0.81 For rotational speeds higher than 2000 rev min -1, the rate of zinc dissolution and the mass transfer coefficient were found to be insensitive to the rotational speed. This behaviour was attributed to the predominance of hydrogen stirring over mechanical stirring. In this region the mass transfer coefficient of zinc dissolution was related to the hydrogen discharge rate by the equation K = constant V 0.43 H 2
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