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Abstract
The mixing of 1% aqueous carboxymethylcellulose solution with Loch Aline sand has been investigated in lab-scale Z-blade and ribbon mixers. Liquid was added in the range 0 – 15% dry weight basis by pour, sparge or spray methods. Liquid distribution in the bulk material (excluding cake) was investigated and a mixing index I was defined which at steady state was independent of the type of machine, composition or operating conditions. This observation has been qualitatively explained by a simple model. Rates of mixing were studied and shown to consist of three regions: an initial solid—liquid contacting period in which mixing is very rapid; an intimate mixing period; and a steady state condition. Pour liquid addition gave the most rapid mixing. The ribbon mixer was most effective for 5% liquid while the Z-blade was superior at 15% liquid.
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