Abstract
A hydrometallurgical process, which consists of a hypochlorite leaching of chlorine-alkali sludge followed by a solid liquid separation with cake washing is presented. The effect of temperature, level of agitation, amount of chlorine in the leaching solution and its consumption in the behaviour of the leaching process was analysed. The results showed that to achieve higher leaching kinetics, there is not any advantage of temperature higher than 25°C, and that there is no need for very strong agitation. It was noted that the chlorine consumption is higher than stoichiometrically necessary. Some flowsheets are proposed with the corresponding computer worksheets. One of them was checked and confirmed by a continuous experiment on laboratory scale. Recirculation of the leaching solution and of the filtration cake washing water diminished the necessary reagent consumption. However the percentage of mercury extraction is slightly decreased due to the increase of mercury concentration in the initial leaching sol...
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