زهرا داودي

Antimony, as one of the major impurities in the electrorefining process of copper, poses several process challenges. This element enters the electrolyte after dissolution an‎d, with increasing concentration, leads to the formation of electrolyte deposits. The presence of this solution causes undesirable phenomena on the anode surface, contamination of the cathode surface an‎d reduced current efficiency. In this study, after the formation an‎d structure of the white deposit, a new pyrometallurgical method based on thermal roasting was developed for the recovery of antimony an‎d was used with the Taguchi experimental design method to conduct the experiment. The effective factors in this thermal roasting included catalyst concentration from 0-15%, temperature from 550-350 Co an‎d time from 40-90 min. Also, different catalysts were compared in terms of efficiency an‎d economic efficiency. In this study, X-ray analysis, scanning microscope an‎d atomic absorption were used. The results of atomic absorption analysis showed that the percentage of deposit formation for antimony was 92%. The optimal recovery conditions in the presence of pyrite were determined using the Taguchi method, including 90 min, 500 °C, an‎d 5 wt% pyrite. Under these conditions, 92% antimony recovery was achieved with a evaporation rate of 6% for antimony an‎d 91% for arsenic. The results of this study indicate that the presence of pyrite as a volatility controlling agent allowed the formation of more stable compounds an‎d reduced element loss.

: پالايش الكتريكي مس , آنتيموان , رسوب سفيد رنگ , تشويه حرارتي , پيرومتالورژي

Electrorefining of copper , antimony , white precipitate , thermal roasting , pyrometallurgy

Zahra Davoudi

Dr. Salman Movahedirad