Thermodynamics of Cu (II) adsorption onto South African clinoptilolite from synthetic solution by ion exchange process.
- Kabuba, John, Ntuli, Freeman, Muzenda, Edison, Mollagee, Mansoor
- Authors: Kabuba, John , Ntuli, Freeman , Muzenda, Edison , Mollagee, Mansoor
- Date: 2011
- Subjects: Clinoptilolite , Adsorption , Thermodynamics , Langmuir isotherm
- Type: Article
- Identifier: uj:6250 , ISSN 2010-4618 , http://hdl.handle.net/10210/8194
- Description: The adsorption of Cu (II) ions from aqueous solution onto clinoptilolite from synthetic solutions by ion exchange was investigated. The effects of solution pH and temperature were examined. The Langmuir isotherm model was employed to calculate the different thermodynamics parameters. Thermodynamics studies revealed that the adsorption behavior of Cu (II) ions onto clinoptilolite was a spontaneous and endothermic process, resulting in higher adsorption capacities at higher temperatures.
- Full Text:
- Authors: Kabuba, John , Ntuli, Freeman , Muzenda, Edison , Mollagee, Mansoor
- Date: 2011
- Subjects: Clinoptilolite , Adsorption , Thermodynamics , Langmuir isotherm
- Type: Article
- Identifier: uj:6250 , ISSN 2010-4618 , http://hdl.handle.net/10210/8194
- Description: The adsorption of Cu (II) ions from aqueous solution onto clinoptilolite from synthetic solutions by ion exchange was investigated. The effects of solution pH and temperature were examined. The Langmuir isotherm model was employed to calculate the different thermodynamics parameters. Thermodynamics studies revealed that the adsorption behavior of Cu (II) ions onto clinoptilolite was a spontaneous and endothermic process, resulting in higher adsorption capacities at higher temperatures.
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The effect of leaching time and ammonia concentration on the atmospheric leaching of copper
- Ntuli, Freeman, Muzenda, Edison, Ramatsa, Ishmael, Belaid, Mohamed, Kabuba, John
- Authors: Ntuli, Freeman , Muzenda, Edison , Ramatsa, Ishmael , Belaid, Mohamed , Kabuba, John
- Date: 2011
- Subjects: Copper recovery , Leaching , Ammonia concentrations
- Type: Article
- Identifier: uj:5319 , ISSN 2010-4618 , http://hdl.handle.net/10210/8195
- Description: The effects of ammonia concentration and leaching time were investigated to determine the optimum leaching conditions. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations of 1.5 M, 2.0 M, 2.5 M and 3.0 M and varying leaching time from 0 to 300 min. Ni-Cu matte containing 23% by mass Cu was used in this experimental study. Increase in the concentration of the lixiviant was found to increase recovery when leaching for 130 minutes, with a recovery of 32.86% Cu using 3 M solution of ammonia. An increase in the leaching time resulted in more copper being leached for all lixiviant concentrations. However, leaching with 2 M ammonia solution gave a higher yield of copper compared to higher concentrations. This anomaly could be a result of cementation; Cu is displaced by Ni as Ni is a more electronegative metal than Cu .It was found that at higher concentrations more nickel was extracted.
- Full Text:
- Authors: Ntuli, Freeman , Muzenda, Edison , Ramatsa, Ishmael , Belaid, Mohamed , Kabuba, John
- Date: 2011
- Subjects: Copper recovery , Leaching , Ammonia concentrations
- Type: Article
- Identifier: uj:5319 , ISSN 2010-4618 , http://hdl.handle.net/10210/8195
- Description: The effects of ammonia concentration and leaching time were investigated to determine the optimum leaching conditions. The experiments were conducted in a leaching cell submerged in a water bath, with ammonia concentrations of 1.5 M, 2.0 M, 2.5 M and 3.0 M and varying leaching time from 0 to 300 min. Ni-Cu matte containing 23% by mass Cu was used in this experimental study. Increase in the concentration of the lixiviant was found to increase recovery when leaching for 130 minutes, with a recovery of 32.86% Cu using 3 M solution of ammonia. An increase in the leaching time resulted in more copper being leached for all lixiviant concentrations. However, leaching with 2 M ammonia solution gave a higher yield of copper compared to higher concentrations. This anomaly could be a result of cementation; Cu is displaced by Ni as Ni is a more electronegative metal than Cu .It was found that at higher concentrations more nickel was extracted.
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Examination of flotation reagents suitable for nickel concentrator plant
- Kabuba, John, Muzenda, Edison, Ntuli, Freeman
- Authors: Kabuba, John , Muzenda, Edison , Ntuli, Freeman
- Date: 2011
- Subjects: Nickel concentrator plant , Flotation reagents - Evaluation , Frother , Magnetic separation
- Type: Article
- Identifier: uj:6249 , ISSN 2010-4618 , http://hdl.handle.net/10210/8193
- Description: Examination of flotation reagents suitable for a nickel concentrator plant was investigated using nickel sulphide ore. A number of different new reagents were examined for the best suit for the nickel concentrator plant. It was found that more nickel was found on the magnetic particles, which were assumed to be mostly pyrrhotite. A dosage of 50 g/t was found to be a suitable dose for the collector Betacol 380 AC and gave the best results, however, it was found to be expensive. Betacol 380 AB was found to be suitable at a dose of 75% g/t. There was no flotation improvement when depressants were used in conjunction with Betacol 380 AC. An activator (copper sulphate) was found to improve the grade of copper, nickel and iron meaning it activated pentlandite. The ions improved the flotability of sulfides at the normal process pH after grinding in steel mill.
- Full Text:
- Authors: Kabuba, John , Muzenda, Edison , Ntuli, Freeman
- Date: 2011
- Subjects: Nickel concentrator plant , Flotation reagents - Evaluation , Frother , Magnetic separation
- Type: Article
- Identifier: uj:6249 , ISSN 2010-4618 , http://hdl.handle.net/10210/8193
- Description: Examination of flotation reagents suitable for a nickel concentrator plant was investigated using nickel sulphide ore. A number of different new reagents were examined for the best suit for the nickel concentrator plant. It was found that more nickel was found on the magnetic particles, which were assumed to be mostly pyrrhotite. A dosage of 50 g/t was found to be a suitable dose for the collector Betacol 380 AC and gave the best results, however, it was found to be expensive. Betacol 380 AB was found to be suitable at a dose of 75% g/t. There was no flotation improvement when depressants were used in conjunction with Betacol 380 AC. An activator (copper sulphate) was found to improve the grade of copper, nickel and iron meaning it activated pentlandite. The ions improved the flotability of sulfides at the normal process pH after grinding in steel mill.
- Full Text:
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