Removal of Copper from Copper-smelting Slags through Chloridizing Roast

doi:10.11901/1005.3093.2015.035

Chinese Journal of Materials Research

2016, Vol. 30

Issue (2): 99-107 DOI: 10.11901/1005.3093.2015.035

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Removal of Copper from Copper-smelting Slags through Chloridizing Roast

LI Lei^**(

), ZHANG Renjie, HU Jianhang

(State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China)

Cite this article:

LI Lei, ZHANG Renjie, HU Jianhang. Removal of Copper from Copper-smelting Slags through Chloridizing Roast. Chinese Journal of Materials Research, 2016, 30(2): 99-107.

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Abstract

The copper in copper-smelting slags can be removed effectively by means of chloridizing roast process, which is beneficial to recover iron from the copper-smelting slags. Thermodynamic analysis was carried out to characterize the performance of copper and iron during the chloridizing roast process. It follows that in a certain range of processing parameters, the copper removal rate can be enhanced with the increasing ing temperature and time for the process, and the increasing amount of CaCl₂addition and FeSO₄. When the addition amount of FeSO₄ was higher than 0.15 (mass ratio of FeSO₄ to copper slags), SO₂ was produced excessively and the (FeO) content in the reaction bed increased quickly. The generated FeO can be chlorinated easily, thereby caused an obvious increase of iron loss and decrease of the copper removal rates. The copper content in the slags decreased from 1.06% to 0.11% after a chloridizing roast treatment at 1373 K for 30 minutes, with an O₂ flow velocity of 0.40 Lmin^-1 and an addition amount of CaCl₂ of 0.20 (mass ratios of CaCl₂ to copper slags) and FeSO₄ of 0.15(mass ratios of FeSO₄ to copper slags).

Key words: metallic materials copper slags chloridizing roast copper removal

Received: 19 January 2015

ZTFLH:

TF524

Fund: *Supported by National Natural Science Foundation of China No.51204082

About author: **To whom correspondence should be addressed, Tel: (0871)65178347, E-mail: tianxiametal1008@163.com

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	Lei LI
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https://www.cjmr.org/EN/10.11901/1005.3093.2015.035 OR https://www.cjmr.org/EN/Y2016/V30/I2/99

Fig.1 XRD pattern of the copper slag cooled with the furnace in N₂ atmosphere after melted

Table1 Chemical composition of the copper slag(%, mass fraction)

Fig.2 Experimental device, 1-Furnace cover,2-MoSi₂ heating staff, 3-Al₂O₃ furnace tube, 4-Thermocouple, 5-Al₂O₃gas piping, 6-Reactor, 7- Fire-resistant pad block, 8-Control cabinet, 9-Flowmeter, 10-Relief valve

Fig.3 △rG_m^Θ-T relation graph of CaCl₂ dissociation

Table 2 Reaction in the dissociation of CaCl₂

Table 3 Reactions during the roasting process between the copper, iron oxides and Cl₂

Fig.4 △rG_m^Θ-T relation graph of the oxides chlorination by Cl₂

Table 4 Reactions during the roasting process between the main sulfides and Cl₂

Table 5 Polymerization of the chlorides during the copper slag chlorination roasting

Fig.5 △rG_m^Θ-T relation graph of the sulfides chlorination by Cl₂

Fig.6 △rG_m^Θ-T relation graph of the polymerization of the chlorides

Fig.7 Effects of CaCl₂ addition amounts on the slag copper contents after treatment

Fig.8 Effects of CaCl₂ addition amounts on the slag iron contents after treatment

Fig.9 XRD pattern of the copper slag after treatment by chlorination roasting

Fig.10 Effects of FeSO₄ addition amounts on the slag copper contents after treatment

Fig.11 Effects of FeSO₄ addition amounts on the slag iron contents after treatment

Table 6 Gibbs free energy and equilibrium constants of reaction (18) and (19) at 1073-1473 K

Fig.12 Effects of roasting temperature on the slag copper contents after treatment

Fig.13 Effects of roasting temperature on the slag iron contents after treatment

Fig.14 Effects of residence time on the slag copper contents after treatment

Fig.15 Effects of residence time on the slag iron contents after treatment

Table 7 Gibbs free energy and equilibrium constants of reaction (20) at 1073-1473 K

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