Browsing by Author "Urbani, MD"

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    Evaluation of saponins as acid mist suppressants in zinc electrowinning
    (ELSEVIER SCIENCE BV, 2004) Cheng, CY; Urbani, MD; Miovski, P; Kittelty, D; Otero, AF; San Martin, RM
    Generation of acid mist is a major concern in zinc electrowinning (EW) due to its detrimental effects on worker's health, the environment and plant infrastructure. One of the effective methods for acid mist control is to form a foam layer above the electrolyte surface by using surfactants. In this work, two saponin-rich products (Mistop(R) and QLZinc(R)) and a commercial Licorice product were evaluated and compared as acid mist suppressants in zinc EW Foam properties, acid mist suppression, phase separation in solvent extraction, cathodic current efficiency (CE) and cathode quality were correlated to the addition of these surfactants. Foam properties studied included minimum soluble solids dosage for 100% foam coverage, time required to achieve 100% foam coverage and foam persistence time.