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THE RECYCLING OF TAILING WASTES OF CALCIUM CHLORIDE FOR OBTAING ADDITIONAL END PRODUCT
Abstract
Liquid industrial wastes from the production of calcium chloride represent CaCl2 solutions with different impurities, most notably ferric ion (III). This article analyses sparingly soluble iron (III) compounds removal from CaCl2 via electroflotation. We determined the optimal pH value for sparingly soluble iron compounds removal from CaCl2 via electroflotation followed by filtration. The iron compounds removal in a most complete manner was found at ?? 6 - 7. Polyelectrolyte (flocculating agents) and surfactants were found to influence electroflotation-based extraction of sparingly soluble iron compounds. Cationic, anionic, non-ionic, and amphoteric substances from different manufacturers were studied. Non-ionic and anionic flocculating agents (Praestol®2500 ? Praestol®2530) added to the tailing wastes of CaCl2 production were shown to increase the sparingly soluble iron compounds electroflotation-based extraction up to 84% and 90%, respectively. The following filtration increased the extraction up to 92% and 98 % (for non-ionic and anionic polyelectrolytes). The important impact on electroflotation-based extraction of sparingly soluble iron compounds had amphoteric surfactant Cocamidopropyl Betaine (BETAPAV®AP.45), extraction of sparingly soluble iron compounds via electroflotation reached 93%, the following filtration increased the extraction up to 98%. We made the experiments with different flocculating agents and surfactants concentrations (1 - 5 mg/l). The increased concentrations of components up to 5 mg/l resulted in more efficient electroflotation, the following component concentration increase did not influence electroflotation. Thus, electroflotation contributes to decreased flocculating agents and surfactants use and electroflotation duration. Compared with calcium chloride solution lightening by setting-out with prior flocculating agents addition, that may last more than 24 hours, electroflotation duration does not exceed 30 minutes.
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