The leaching behaviour of a nickel concentrate in an oxidative sulphuric acid solution

Bredenhann, R.; Vuuren, C.P.J. Van

doi:10.1016/s0892-6875(99)00051-5

Cited by 24 publications

(11 citation statements)

References 4 publications

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“…Secondly, oxygen is also an oxidant arising from decomposition of nitric acid. Oxidative dissolution of a sulfide concentrate using nitrate as the leaching agent in an acidic medium takes place with formation of elemental sulfur [6][7][8], and a minor part of sulfide sulfur oxidizes to the sulfate under certain conditions. Miroslav, et al [6] determined the optimal leaching conditions of chalcopyrite concentrate by sulfuric acid (H 2 SO 4 ) and sodium nitrate (NaNO 3 ) under different parameters.…”

Section: Introductionmentioning

confidence: 99%

Dissolution behavior of copper concentrate in acidic media using nitrate ions

et al. 2014

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This study was conducted to investigate the dissolution process of copper concentrate using sodium nitrate (NaNO 3 ) in a sulfuric acid (H 2 SO 4 ) medium under various controlling parameters, including dissolution temperature, time, particle size, solid/liquid (S/L) ratio and concentration of NaNO 3 and H 2 SO 4 . The thermodynamic probability of mineral dissolution (CuFeS 2 , Cu 2 S, CuS, FeS 2 ) reaction in the concentrate was estimated by standard Gibbs energy. The activation energy (E a ) for the dissolution of copper concentrate was calculated as 15.96kJ/mol. Batch experimental results show that about 89.9% of copper in the intact concentrate have been leached and it increased to 96.5% at the fraction with <25.4µm particle size. Copper leaching rate has direct correlation with increase in time, temperature, solid/liquid (S/L) ratio and H 2 SO 4 concentration. The XRD and XRF analyses of the solid residue after leaching revealed the presence of elemental sulfur.

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Section: Introductionmentioning

confidence: 99%

Dissolution behavior of copper concentrate in acidic media using nitrate ions

et al. 2014

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“…Especially at 50 °C, this low leachability and the extraction rate might be a result of the formation of elemental sulfur as well as the insufficient activation energy for the extraction reaction of Cu from CuS. This sulfur would build up as a protective layer, or "passivation layer", on the surface of the CuS particles, and it might play a role in blocking acidic leaching for various sulfides including CuS [31][32][33].…”

Section: Copper Leaching Of the Mechanically Activated Cusmentioning

confidence: 99%

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

Lee

Kim

et al. 2018

Metals

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Abstract:The effect of mechanical activation on the copper leaching of copper sulfide, CuS, in 1 M HNO 3 (slurry density: 10 g/L) was investigated by analysis of the leachability and the apparent activation energy. Mechanical activation produced an increase in the leachability and a decrease of the activation energy in this leaching reaction. The leachability increased proportionally to the degree of mechanical activation, reaching 96.6% leaching within 60 min at 80 • C from CuS ground at 700 rpm for 15 min. This leaching process was controlled by surface chemical reaction following the shrinking-core model. The apparent activation energy of leaching for CuS (71.5 kJ/mol) in the range of 50 to 80 • C decreased with an increase of the degree of mechanical activation, reaching 44.3 kJ/mol for Cu leaching from CuS ground at 700 rpm for 15 min.

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“…Reaction (2) is accompanied by several secondary reactions shown by Reactions (3) to (8). Oxidative leaching of a chalcopyrite concentrate in an acid medium using nitrate as an oxidizing agent generates elemental sulfur [16,18,21]. The solution creates a strong oxidizing environment, as shown in Reaction (5):…”

Section: Introductionmentioning

confidence: 99%

An Alternative Process for Leaching Chalcopyrite Concentrate in Nitrate-Acid-Seawater Media with Oxidant Recovery

Castellón

Hernández

Velásquez-Yévenes

et al. 2020

Metals

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An alternative copper concentrate leaching process using sodium nitrate and sulfuric acid diluted in seawater followed by gas scrubbing to recover the sodium nitrate has been evaluated. The work involved leaching test carried out under various condition by varying temperature, leaching time, particle size, and concentrations of NaNO3 and H2SO4. The amount of copper extracted from the chalcopyrite concentrate leached with seawater, 0.5 M of H2SO4 and 0.5 M of NaNO3 increased from 78% at room temperature to 91% at 45 °C in 96 h and 46 h of leaching, respectively. Gas scrubbing with the alkaline solution of NaOH was explored to recover part of the sodium nitrate. The dissolved salts were recovered by evaporation as sodium nitrate and sodium nitrite crystals.

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The leaching behaviour of a nickel concentrate in an oxidative sulphuric acid solution

Cited by 24 publications

References 4 publications

Dissolution behavior of copper concentrate in acidic media using nitrate ions

Dissolution behavior of copper concentrate in acidic media using nitrate ions

Effect of Mechanical Activation on the Kinetics of Copper Leaching from Copper Sulfide (CuS)

An Alternative Process for Leaching Chalcopyrite Concentrate in Nitrate-Acid-Seawater Media with Oxidant Recovery

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