Textural, mineralogical and chemical characteristics of copper reverb furnace smelter slag of the Okiep Copper District, South Africa

Rozendaal, A.; Horn, Richard

doi:10.1016/j.mineng.2013.06.020

Cited by 30 publications

(23 citation statements)

References 2 publications

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“…On the other hand, the Cu 2+ ions can react with free ammonia and form different metalammonia complexes depending on the pH condition. According to the Cu 2+ speciation profile in the pH range from 6 to 12, most copper is in the form of Cu 2+ ammonia complexes, and when pH is greater than 12, the negatively charged Cu(OH) 4 2À is the dominant species.…”

Section: Effect Of Phmentioning

confidence: 99%

“…However, copper losses relating to the fine particle size fraction, existence of copper oxides, and elemental copper have been reported, and grinding to <45 lm was found necessary to improve the extraction of copper. [4] On the other hand, hydrometallurgical routes for copper recovery from slags are faced with some limitations. High solubility of undesired elements such as Fe, Mg, and Ca in acidic media leads to high consumption of these agents and a noneconomic leaching process.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Copper Ammonia Leaching from Smelter Slags: Characterization, Leaching and Kinetics

Bidari

Aghazadeh

2015

Metall Mater Trans B

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EHSAN BIDARI and VALEH AGHAZADEHAlthough ammonia leaching of copper from slags has been reported generally as a part of copper slag utilization methods, but no detailed studies have been reported in the literature. In this research, we tried to investigate the effect of different parameters on ammonia leaching of copper from copper smelting slag by identifying different copper-bearing phases and following them during leaching time. Mineralogical characterization of the smelting slag (1.7 pct Cu) was done using X-ray fluorescence, X-ray diffraction, optical microscopy, diagnostic leaching tests, and scanning electron microscopy. The characterization studies indicated that main copperbearing species are soluble copper oxides and chalcocite along with minor amount of covellite, bornite, blister copper particles, and chalcopyrite. It was also found that only approximately 0.2 pct Cu was present in the insoluble bulk silicate phases. These results suggest that approximately 88 pct of the total copper of slag could be extracted by ammonia sulfide leaching. Leaching tests were carried out and the effects of various parameters, namely pH, ammonia concentration, temperature, presence of oxygen, stirring speed, and pulp density were examined on copper leaching. The temperature and stirring speed had the most pronounced effect on the copper leaching, whereas ammonia affected the leaching yield at low concentrations of ammonia. It was found that 78 pct of Cu could be extracted within 4 hours and under optimum conditions: T = 343 K (70°C), 2M ammonia, pH 10.5, stirring speed = 900 rpm, pulp density = 10 pct (w s /v). The kinetic data were analyzed with the shrinking core models, and it was found that the leaching process is controlled by both the interfacial transfer and diffusion across the product layer and the activation energy is calculated to be 49.4 kJ mol À1 .

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Section: Effect Of Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of Copper Ammonia Leaching from Smelter Slags: Characterization, Leaching and Kinetics

Bidari

Aghazadeh

2015

Metall Mater Trans B

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“…e main constituents that need to be recycled are matte, copper oxide, and copper, and the most commonly used technique for the recycling is flotation [7,8]. In the past, most researches about the recycle and utilization of the copper slag were conducted to optimize the flotation agents, processes, and procedures in the flotation process of copper recycling [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Copper and Iron Ions on the Sulphidizing Flotation of Copper Oxide in Copper Smelting Slag

Pan

Peng

2018

Advances in Materials Science and Engineering

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e treatment of smelting slag has attracted much attention nowadays. is study investigates the influence of Na 2 S, CuSO 4 , and FeCl 3 on sulphidizing flotation of copper oxide. e results show that a proper Cu 2+ concentration can increase the sulphidizing effect of copper oxide, while Fe 3+ inhibits the sulphidizing effect. Further analysis shows that Cu 2+ ions can reduce the surface potential, increase the S 2− adsorption, then generate more polysulfide, and therefore promote the sulphidizing flotation. However, Fe 3+ ions would increase the surface potential, reduce the S 2− adsorption, generate more sulfur element, and therefore inhibit the sulphidizing flotation.

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“…Recovering metals from metallurgical residues, therefore, have become increasingly important. However, mineralogical structure and the size of phase particulate within copper slag could be influenced by many factors such as separation processes, instruments and cooling methods [4][5][6][7]. Slow cooling often results in crystallization of slag constituent, and forms a great many different mineral phases.…”

Section: Introductionmentioning

confidence: 99%

Separating and Recycling of Fe, Cu, Zn from Dumped Copper Slag by Microwave Irradiation Assisted Carbothermic Method

Liao¹,

Zhou²,

Huang³

2016

JRST

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Iron, copper and zinc were separated and recycled from dumped copper slag using a carbothermic method in the presence of microwave irradiation. Iron in the form of fayalite and magnetite in the slag was reduced to metal iron while zinc was evaporated and captured as zinc oxide powder. Results indicated that metallization rate of iron could reach 91.38~93.45 wt% and zinc recovery efficiency was 90.5 wt% when the new methodology was employed, and that reaction temperature was 100°C lower compared to that of traditional processes, reaction time of the new process was decreased by 90 min.

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Textural, mineralogical and chemical characteristics of copper reverb furnace smelter slag of the Okiep Copper District, South Africa

Cited by 30 publications

References 2 publications

Investigation of Copper Ammonia Leaching from Smelter Slags: Characterization, Leaching and Kinetics

Investigation of Copper Ammonia Leaching from Smelter Slags: Characterization, Leaching and Kinetics

Effect of Copper and Iron Ions on the Sulphidizing Flotation of Copper Oxide in Copper Smelting Slag

Separating and Recycling of Fe, Cu, Zn from Dumped Copper Slag by Microwave Irradiation Assisted Carbothermic Method

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