Leaching kinetics of calcification roasting calcinate from multimetallic sulfide copper concentrate containing high content of lead and iron

Liao, Yalong; Zhou, Juan; Huang, Feirong; Wang, Yiyang

doi:10.1016/j.seppur.2015.05.042

Cited by 29 publications

(6 citation statements)

References 24 publications

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“…To study the effect of the agitation speed on the leaching rate, various experiments were carried out at an agitation speed ranging from 150 to 300 rpm with a liquid–solid ratio of 4.0 mL/g, a sulfuric acid excess coefficient of 1.15, and a reaction temperature of 353 K. The results obtained are shown in Figure , which indicate that the leaching rate increased with the increase of the agitation speed. The reason for this was that the high agitation speed made the thickness of the mass transfer boundary layer on the surface of particles decrease . Meanwhile, the suspension degree of mineral particles was improved by the rigid-flexible combined impeller, which made sulfuric acid and mineral particles mix and touch completely.…”

Section: Resultsmentioning

confidence: 99%

Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate Rock: a Kinetics Study

et al. 2021

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Conventional rigid impellers are frequently used in the leaching process of phosphate rock, which often form a symmetrical flow field in the reactor, leading to a reduction in the leaching efficiency. In this work, a rigid-flexible combined impeller was applied to the leaching process of phosphate rock to increase the leaching efficiency. The effects of the reaction temperature (T), sulfuric acid excess coefficient (ε), liquid−solid ratio (L/S), agitation speed (N), and leaching time (t) on the leaching of phosphate rock were investigated, and based on this, the leaching kinetics was studied. The results indicated that under the optimum parameters of a reaction temperature of 353 K, a sulfuric acid excess coefficient of 1.15, a liquid−solid ratio of 4.0 mL/g, an agitation speed of 280 rpm, and a leaching time of 120 min, the leaching rate of phosphate rock using the rigidflexible combined impeller reached 89.1%, which was 7.1% higher than that of the conventional rigid impeller under the same electric energy consumption. The leaching process complied with the unreacted core shrinking model, and the reaction rate was controlled by product layer diffusion. The apparent rate equation of the leaching process was 1 273 [N] 0.748 exp(−19.03 × 10 3 /RT)•t, and the apparent activation energy was 19.03 kJ/mol. The numerical simulation and analysis of the leaching residue showed that the system temperature in the rigid-flexible combined impeller system was homogenized, and the mixing effect of reactants was enhanced through the multiposition movement of the flexible connection piece in the axial direction, so that the reactants participated in the chemical reaction more efficiently.

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Section: Resultsmentioning

confidence: 99%

Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate Rock: a Kinetics Study

et al. 2021

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“…The results indicate that the leachability of zinc is almost independent of particle size below 105 μm. Thus, for further experiments, particles in As shown in Figure 2, the leachability of zinc increased with increasing agitation speed and leaching time due to the decreasing thickness of the mass transfer boundary layer on the surface of the MOV particles [19]. However, it was also found that the leachability of zinc remained almost constant over 300 rpm.…”

Section: Effect Of Particle Sizementioning

confidence: 87%

“…After 15 min of treatment, the leachability of zinc increased slowly with an increase in reaction time. The molecular collisions, mass transfer co-efficient, and reaction constant are improved with increasing temperature [19]. However, when the reaction temperature increased from 313 K to 353 K, the leachability of zinc increased from 80.48% to 86.8% after 60 min in 0.1 M H 2 SO 4 .…”

Section: Effect Of Reaction Temperaturementioning

confidence: 95%

Leaching Kinetics of Zinc from Metal Oxide Varistors (MOVs) with Sulfuric Acid

Kim

Lee

2016

Metals

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Abstract:The leaching kinetics of zinc from zinc oxide-based metal oxide varistors (MOVs) was investigated in H 2 SO 4 at atmospheric pressure. Kinetics experiments were carried out at various agitation speeds, particle sizes, initial H 2 SO 4 concentrations, and reaction temperatures. It was determined that the leaching rate of zinc was independent of agitation speed above 300 rpm and also independent of particle size below 105 µm, whereas it dramatically increased with an increasing H 2 SO 4 concentration. Except for when the H 2 SO 4 concentration was varied, the m-values were almost constant at varying agitation speeds (m-values: 0.554-0.579), particle sizes (m-values: 0.507-0.560) and reaction temperature (m-values: 0.530-0.560) conditions. All of the m-values in these experiments were found to be below 0.580. Therefore, it is proposed that the extraction of zinc is a diffusion-controlled reaction. The leaching kinetics followed the D3 kinetic equation with a rate-controlling diffusion step through the ash layers, and the corresponding apparent activation energy was calculated as 20.7 kJ/mol in the temperature range of 313 K to 353 K.

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“…), flotation concentration plant. It was sieved to -212 µm before dried at 105 °C for 12 h. The mineralogical analysis results of the chalcopyrite concentrate samples are given in Table 1, and the mineralogical analysis results of the roasted concentrate, which has been subjected to oxidizing roasting process at 600 °C for 1 h according to the data in the literature [6,19,20,42,63,65,67,[79][80][81][82][83], are given in Table 2.…”

Section: Methodsmentioning

confidence: 99%

“…About 80-85% of the copper production in the world is executed with the traditional pyrometallurgical processes, which consist of concentration by flotation, smelting, fire refining, and electro-refining routes [1,2,11,12,[15][16][17][18][19]. Recently, due to technical and economic reasons of the traditional pyrometallurgical process [20] such as high-grade ore requirement [21], high investment for smelting and refining plants, as well as undesirable environmental effects caused by the formation of sulfur oxides (SO 2 and/or SO 3 ) [17,19,[21][22][23], the hydrometallurgical process becomes an alternative route to copper extraction from low grade and complex sulfide copper concentrates [17,20,[24][25][26][27][28][29]. Copper extraction from chalcopyrite by hydrometallurgical methods can be classified according to used type of solvent such as chloride/chlorine systems, nitric acid, sulfuric acid, ammoniacal solution and biological systems [19,[30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Optimization of sulfuric acid leaching of roasted chalcopyrite concentrate with Box–Wilson experimental design

et al. 2020

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Chalcopyrite (CuFeS 2 ) is commonly used ore in production of copper, but leaching of this ore is very slow and inefficient due to "passivation" during leaching at atmospheric conditions. In this study, in order to overcome drawbacks of the passivation layers, the concentrate supplied from Eti Bakır A.Ş. Küre Plant in Turkey was roasted at 600 °C for 1 h and after leached. Box-Wilson procedure of statistical experimental design was utilized to identify the effects of significant leaching variables for instance leaching time (X 1 ; 10-120 min), solid/liquid ratio (X 2 ; 0.01-0.20), and H 2 SO 4 concentration (X 3 ; 0.01-1.00 M) on Cu extraction (%) from roasted concentrate and was tried to be optimized. The coefficients of response functions have been calculated by regression analysis, and the estimates have been found to be well in line with the experimental outcomes. The optimal leaching parameters, time, solid/liquid rate and H 2 SO 4 concentration were determined as 115 min, 0.116, and 0.71 M, respectively, and the highest Cu extraction (%) value was calculated as 92.45%.

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Leaching kinetics of calcification roasting calcinate from multimetallic sulfide copper concentrate containing high content of lead and iron

Cited by 29 publications

References 24 publications

Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate Rock: a Kinetics Study

Rigid-Flexible Combined Impeller Enhancement in Leaching of Phosphate Rock: a Kinetics Study

Leaching Kinetics of Zinc from Metal Oxide Varistors (MOVs) with Sulfuric Acid

Optimization of sulfuric acid leaching of roasted chalcopyrite concentrate with Box–Wilson experimental design

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