Kinetics of Oxidative Roasting of Complex Copper Concentrate

Kim, Byung-Su; Kim, Eun Young; Kim, Chi-Kwon; Lee, Hoo-In; Sohn, Jeong-Soo

doi:10.2320/matertrans.mer2007311

Cited by 9 publications

(3 citation statements)

References 9 publications

(7 reference statements)

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“…During these processes, a number of reactions occur simultaneously, and they frequently influence one another. To explain the sequence of various reactions and products formed, a thermal analysis technique is often employed [13][14][15][16][17][18]. On the other hand, the thermodynamics of roasting can be expressed by predominance area diagrams or Kellogg diagrams [19].…”

Section: J Min Metall Sect B-metall 55 (3) B (2019) 315 -324mentioning

confidence: 99%

Cobalt and copper recovery from the ancient flotation tailings by selective sulfation roast - leaching process

Özer

2019

J min metall B Metall

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The ancient flotation tailings from Lefke, Cyprus, have a potential for non-ferrous metals such as cobalt and copper from more than 9.5 million tons of reserves containing 0.38% Cu, 0.032% Co, and 22.6% Fe. Recovery of cobalt and copper from these tailings can provide great benefits from economic and environmental perspectives. While the ancient tailings were kept long time in storage in dumps, the characteristics of the material has become different from the common Co and Cu bearing ores. In order to extract these valuable metals, a process involving combination of roasting and leaching was applied in this study. Since this process responded to recovery to some extent, an innovative technique of using Na 2 SO 4 as a promoter during roasting was proposed. Utilizing of Na 2 SO 4 did not provide only higher metal extractions, but also resulted in high selectivity. In the scope of the study, following the determination of the mineralogy and chemical composition of the tailings, certain processes such as direct leaching and sulfation roasting with/without additives before leaching were applied. Since low metal extractions were obtained from direct leaching, a selective sulfation process was applied on the tailings before leaching in order to produce a pregnant solution containing higher amounts of Co and Cu metals by reducing the iron concentration. When sulfation roasting was performed without any additive, the desired selectivity could not be provided, since the sample was considerably oxidized under the atmospheric conditions in the past. Therefore, the usage of Na 2 SO 4 as an additive with the amount of 25% at a roasting temperature of 700ºC was tested. Consequently, Na 2 SO 4 improved the sulfation and resulted in higher cobalt (90.1%) and copper (71.2%) recovery during leaching. Beside this, an improvement with a selective sulfation was obtained by combined effect of Na 2 SO 4 addition and temperature, and the iron extraction decreased from 26.1% to 3.9%.

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Section: J Min Metall Sect B-metall 55 (3) B (2019) 315 -324mentioning

confidence: 99%

Cobalt and copper recovery from the ancient flotation tailings by selective sulfation roast - leaching process

Özer

2019

J min metall B Metall

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“…8) A sample weight of about 500 mg (AE15 mg) of the Mongolian molybdenite concentrate was used for each run. The experiments were conducted at the temperature range of 778 K and 838 K under a dry air flow rate of 8.3 mL/s.…”

Section: Methodsmentioning

confidence: 99%

Kinetics of the Oxidative Roasting of Low Grade Mongolian Molybdenite Concentrate

et al. 2009

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Molybdenite concentrate is the major mineral for the molybdenum industry. The industrial processing of molybdenite concentrate is first to convert to technical grade molybdenum trioxide by its oxidative roasting, followed by its purification by distillation or its ammonia leaching. In the present research, detailed experimental results for the oxidative roasting of low grade Mongolian molybdenite concentrate are presented. The experiments were carried out in the temperature range of 778 to 838 K under air atmosphere by using a thermogravimetric analysis technique. The particle size of the molybdenite concentrate was varied between 53 and 103 mm. As an example of the oxidative roasting of low grade Mongolian molybdenite concentrate, more than 95% of 53 mm particle size molybdenite was converted to molybdenum trioxide in 40 min at 823 K. The Jander equation was found to be useful in describing the rates of the oxidative roasting, which had an activation energy of 215.0 to 259.3 kJ/mol (51.4 to 62.0 kcal/mol) for various sizes, such as 53 mm, 67 mm and 103 mm.

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“…3) This is the reason why in the nonisothermal condition, large amount of sulfate compounds such as ZnSO 4 , CuSO 4 and PbSO 4 during the oxidation reaction is produced before the removal reaction of sulfur happens, 3) while in the isothermal condition relatively small amount of them was done during the initial period of the oxidation reaction as shown in Fig. 2.…”

Section: Interpretation Of the Rate Datamentioning

confidence: 99%

Oxidative Sulfur Removal from Complex Copper Concentrate

et al. 2008

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It is very important to remove sulfur from complex copper concentrates for smelting them by a carbon reduction process since copper concentrates are progressively becoming complex and low grade. The carbon reduction process largely consists of the oxidation process of complex copper concentrate and smelting process of the oxidized concentrate. In the present work, the kinetics study has been performed on a complex copper concentrate to understand the oxidation process over a temperature range of 998 to 1073 K and an oxygen partial pressure range of 15.20 to 50.66 kPa using a thermogravimetric method. It was found that the oxidation rate was very fast under the whole temperature range and almost 95% of sulfur contained in the concentrate was removed after 15 min at 1073 K under an oxygen partial pressure of 21.28 kPa. Sulfur removal ratio as a function of time has been analyzed by using a shrinking-core model and the effect of oxygen partial pressure has been elucidated.

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Kinetics of Oxidative Roasting of Complex Copper Concentrate

Cited by 9 publications

References 9 publications

Cobalt and copper recovery from the ancient flotation tailings by selective sulfation roast - leaching process

Cobalt and copper recovery from the ancient flotation tailings by selective sulfation roast - leaching process

Kinetics of the Oxidative Roasting of Low Grade Mongolian Molybdenite Concentrate

Oxidative Sulfur Removal from Complex Copper Concentrate

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