Studies in Reduction-Roast Leaching Ion Exchange of Copper Converter Slag from an Indian Copper Complex, Ghatshila
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- 作者：M. G. Bodas and S. B. Mathur
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：1997
- 出版时间：December 1997
- 年：1997
- 卷：36
- 期：12
- 页码：5419 - 5424
- 全文大小：115K
- 年卷期：v.36,no.12(December 1997)
- ISSN：1520-5045
文摘
Utilization of industrial waste is of utmost importantdue to pollution constraints. Largequantities of converter and anode slags are generated in different unitoperations for theproduction of copper in I.C.C. Ghatshila. The converter slagcontains about 2.75% copper, 0.9%nickel, 52.0% iron, and 0.6% cobalt and cannot be rejected due to itseconomic importance. X-raydiffraction (XRD) studies revealed the presence of copper in elemental,oxide, and silicate phasesand iron in silicate (feyalite) and oxide(Fe2O3) phases. From the earlier work onleaching byan acetic acid lixiviant up to 55% Copper could be extracted at 250 mLof acetic acid/100 g ofslag, 125 
C temperature, and 35 atm of oxygen pressure. Lowcopper recovery was attributedto the presence of copper silicate and sulfide phases which could notbe detected by XRD.Therefore, reduction roasting by noncoking coal was done toincrease the copper recovery. Acoal sample from Talchar which contained 30% fixed carbon, 40%volatile, and 30% ash wasused for reduction roasting. Pellets were prepared manually bymixing powdered coal in differentproportions with ground slag (-100 mesh). Roasting of thepellets was carried out in thetemperature range of 650-800 C. Maximum percent extraction ofcopper and nickel (97% Cuand 20% Ni) could be achieved at the temperature of 720 C for 90min of roasting with 20%reductant. The acetic acid requirement was 130 mL/100 g of reducedpellets, while leaching atthe oxygen pressure of 35 atm for 120 min at 120 C. Thesolid-liquid ratio was maintained at1:5 in all the experiments. The copper concentration in the leachliquor was 4.5 g/L. Irondissolution was minimum (max 1%) in all the experiments. Theion-exchange technique wasemployed to separate copper from acetate solution. Zeolite resinwas found to be suitable forthe separation of copper from leach liquor. About 92% copper wasrecovered by geolite. 2.5 NH2SO4 was found to be most effective forthe stripping of the copper from resin.
C temperature, and 35 atm of oxygen pressure. Lowcopper recovery was attributedto the presence of copper silicate and sulfide phases which could notbe detected by XRD.Therefore, reduction roasting by noncoking coal was done toincrease the copper recovery. Acoal sample from Talchar which contained 30% fixed carbon, 40%volatile, and 30% ash wasused for reduction roasting. Pellets were prepared manually bymixing powdered coal in differentproportions with ground slag (-100 mesh). Roasting of thepellets was carried out in thetemperature range of 650-800 C. Maximum percent extraction ofcopper and nickel (97% Cuand 20% Ni) could be achieved at the temperature of 720 C for 90min of roasting with 20%reductant. The acetic acid requirement was 130 mL/100 g of reducedpellets, while leaching atthe oxygen pressure of 35 atm for 120 min at 120 C. Thesolid-liquid ratio was maintained at1:5 in all the experiments. The copper concentration in the leachliquor was 4.5 g/L. Irondissolution was minimum (max 1%) in all the experiments. Theion-exchange technique wasemployed to separate copper from acetate solution. Zeolite resinwas found to be suitable forthe separation of copper from leach liquor. About 92% copper wasrecovered by geolite. 2.5 NH2SO4 was found to be most effective forthe stripping of the copper from resin.