Abstract
Abstract The suspension of solids in a liquid is an operation common to many applications of mixing in process engineering. A new concept is suggested for calculating the minimum theoretical power requirement to suspend a given amount of solids in a stirred vessel. A material balance equation, based on the effective adsorption of gold cyanide onto activated carbon and ion-exchange resin in a stirred vessel, was used to estimate mass-transfer parameters which were used to derive an optimum impeller speed. It will be demonstrated that the minimum theoretical power derived here is in agreement with other concepts proposed in the literature, and in some cases even suggest smaller minimum values. Furthermore, it will be shown that inert fines in solution can enhance the effective mass transfer, thus minimizing the power input.
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