Zinc electrowinning from industrial electric arc furnace dust
Elektrolitičko izdvajanje cinka iz prašine industrijske elektrolučne peći
Apstrakt: Cilj ovog istraživanja je izdvajanje metalnog cinka iz prašine koja nastaje u industrijskoj elektrolučnoj peći (EAF prašina) postupkom elektrovininga. Ispitivanja su realizovana u laboratorijskim uslovima sa sumporno kiselim elektrolitima. Katodna gustina struje iznosila je 500 A/m2. Temperatura elektrolita održavana je u opsegu 38±2 °C. Trajanje procesa je izračunato da bi se koncentracija Zn u elektrolitu smanjila za 30 g/l. Rezultati su pokazali iskorišćenje struje u opsegu od 50,4 % do 89,3 %, zavisno od sastava elektrolita i čistoće katodnih materijala. Rezultati ispitivanja potvrđuju da se EAF prašina može koristiti kao sirovina za elektrolitičko dobijanje cinka. Takođe, hemijska karakterizacija elektrolita na početku i na kraju svakog eksperimenta, kao i karakterizacija katodnih depozita dobijenih tokom procesa elektrovininga, skenirajuća elektronska mikroskopija sa energetski disperzivnom rendgenskom spektroskopijom (EDS), potvrdili su da nečistoće iz elektrolita imaju krucijalan uticaj na kvalitet depozita cinka.
Abstract: The aim of this study was a recovery of zinc metal from dust generated in the industrial electric arc furnace (EAF dust) by the electrowinning process. Investigations are realized in laboratory conditions with sulphury acid electrolytes. Cathode current density was 500 A/m2. Electrolyte temperature was in the range of 38±2 oC. Process duration was calculated in order to reduce the Zn concentration in the electrolyte by 30 g/l. Results are shown that the current efficiency was in a range from 50.4 mass % to 89.3 mass % in accordance with the electrolyte composition and purity of the cathode materials. The results of the tests are confirmed that the EAF dust could be used as a raw material for electrolytic zinc recovery. Also, chemical characterization of the electrolyte at the start and at the end of each test, as so as the cathode deposits characterization, scanning electron microscopy with energy-dispersive X-ray spectroscopy (EDS) of cathode deposits obtained during the electrowinning process, confirmed that the electrolyte impurities have the crucial influence on the quality of deposited zinc.
engleski
2022
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Keywords: zinc, electric arc furnace, electrowinning, impurities, SEM EDS.
Ključne reči: cink, elektrolučna peć, elektrovining, nečistoće, SEM EDS.