Recovery of metal values from copper smelter slags by roasting with pyrite

Abstract

Sulphation roasting of primary and secondary copper slags has been carried out to facilitate the dissolution of copper, nickel, cobalt, zinc and iron. The process comprised preroasting of the ground slag followed by roasting with pyrite and then leaching with water. The effects of the roasting and leaching conditions on the recovery of the metal values were explored. While a significant amount of copper solubilization was achieved by direct roasting of sulphidic primary slags, roasting with added pyrite increased the recovery. This technique also enabled the copper to be recovered from a secondary smelting slag. Under optimum conditions, more than 95% of copper could be recovered by only a limited recovery of cobalt, nickel and zinc could be achieved by roasting the preroasted slag with pyrite at 550°C for 1 h with a 0.25 pyrite/slag ratio. Around 2% of the iron in the slags was extracted into the leach solutions. An increase in the roasted temperature resulted in reduced iron contamination but the recovery of copper was also reduced. However, aeration seemed to be an appropriate way to reduce the iron contamination of the leach solutions.

Galvanic sludge metals recovery by pyrometallurgical and hydrometallurgical treatment

“…Comparing the results achieved in this work with the results obtained by Tümen and Bailey [21], the roasting temperature is the same but roasting time and pyrite/waste slag are slightly different. Extraction values in Table 5 shows that Tümem et al [18] obtained higher percentual extraction but lower total mass extraction.…”

“…11) did not suffer the same influence. Tümen and Bailey [21] observed similar thermal behavior and explained through the basic copper sulphate thermal decomposition to copper oxysulphate (CuSO 4 ·CuO) and its further decomposition Iron leaching is also highly temperature dependent in the studied range and above 650 • C there is no more iron present in liquid samples (Fig. 12).…”

“…Other authors [20,21] show the use of similar procedure to remove metals from primary and secondary copper slags. The proposed reaction, responsible to metals extraction in sulphate form, is presented below [21]:…”

A Study of the Optimal Model of the Flotation Kinetics of Copper Slag from Copper Mine BOR

“…In the past decades, many methods have been proposed, on a laboratory scale, for valorization of copper from slag, including various processes such as flotation (Osborn et al, 1986;Barrios, 1991;Bota et al, 1995;Bruckard et al, 2004;Arslan & Arslan, 2002;Stanojlovic et al, 2002;Sarrafi et al, 2003;Stanojlovic et al, 2008;Stanojlovic & Sokolovic, 2011;Das et al, 2010;Stirbanovic & Markovic, 2011), leaching (Tumen & Bailey, 1990;Altundogan & Tumen, 1997;Herreros et al, 1998;Jia et al, 1999;Ahmed et al, 2000;Ziyadanogullari, 2000;Banza et al, 2002;Gul et al, 2003;Kongolo et al, 2003;Bulut, 2006) and combination of these methods for metal recovery . Some of these methods were briefly reviewed by Gorai et al (2003).…”

Hydrometallurgical Approach for Leaching of Metals from Copper Rich Side Stream Originating from Base Metal Production

“…Various hydrometallurgical methods have been developed using lixiviants such as acids, bases, and salts for base metal extraction. Atmospheric leaching of different slag fractions has been studied in H 2 SO 4 , FeSO 4 , (NH 4 ) 2 SO 4 , FeS 2 , NaCl, and FeCl 2 media [19][20][21][22][23]. In addition, pressure leaching of copper slag containing 4.03% Cu, 0.48% Co, and 1.98% Ni at 130 • C have resulted in significant recoveries of Cu, Co, and Ni, amounting to 90% [24].…”