|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Applications of Process Engineering Principles in Materials Processing, Energy and Environmental Technologies: An EPD Symposium in Honor of Professor Ramana G. Reddy
||Chloridizing Roasting of Bismuthinite with Sodium Chloride-oxygen
||Rafael Padilla, Luis Salinas, Maria Cristina Ruiz
|On-Site Speaker (Planned)
Chloridizing roasting of bismuthinite (Bi<SUB>2</SUB>S<SUB>3</SUB>) with NaCl-O<SUB>2</SUB> has been studied to remove Bi by volatilization from copper concentrates that contain bismuthinite. The study was conducted using mixtures of Bi<SUB>2</SUB>S<SUB>3</SUB> and NaCl in a horizontal furnace and TGA apparatus. The variables were temperature, oxygen partial pressure, and NaCl concentration. The chlorination was analyzed by weight loss measurement method. XRD results of calcines reacted for short times in 21% O<SUB>2</SUB>, and 850-1000 °C showed the presence of Bi, BiOCl, and Na<SUB>2</SUB>SO<SUB>4</SUB>, while at longer times Bi<SUB>2</SUB>O<SUB>3</SUB> was identified. Thus, the Bi<SUB>2</SUB>S<SUB>3</SUB> chlorination-volatilization proceeds through intermediates compounds Bi and BiOCl. Temperature affected significantly the weight loss of samples. At 600 and 900 °C in 10.3% oxygen, the maximum weight loss was 4% and 20%, respectively. An increment in the partial pressure of oxygen in the range 1 to 21% affected negatively the Bi<SUB>2</SUB>S<SUB>3</SUB> conversion. Bismuth volatilization by NaCl roasting would be marginal.
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