Recovery of chromium from residue of sulfuric acid leaching of chromite

Zhao, Qing; Liu, Chengjun; Li, Baokuan; Zevenhoven, Ron; Saxén, Henrik; Jiang, Maofa

doi:10.1016/j.psep.2017.10.002

Cited by 25 publications

(5 citation statements)

References 38 publications

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“…The composite number of elements in the BBD test group was relatively lower and more cost effective compared to the central composite design. Moreover, it requires fewer consecutive trials [44][45][46][47].…”

Section: Optimal Experimental Designmentioning

confidence: 99%

Investigation of the Leaching Kinetics of Zinc from Smithsonite in Ammonium Citrate Solution

Chen,

Wu,

Wang

2024

Metals

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In this study, the response surface method is used to develop a model for analyzing and optimizing zinc leaching experiments. An investigation into the leaching kinetics of smithsonite in ammonium citrate solution is also conducted. A model of kinetics is studied in order to represent these effects. The experimental data show that an increase in the solution temperature, concentration, and stirring speed has a positive impact on the leaching rate, while an increase in the particle size has a negative impact on it. The optimal experimental conditions consist of a leaching temperature of 70 °C, ammonium citrate concentration of 5 mol/L, particle size of 38 µm, and rotational speed of 1000 rpm. Under these optimal conditions, the leaching rate of zinc from smithsonite is 83.51%. It is speculated that the kinetic model will change when the temperature is higher than 60 °C. When the temperature is lower than 60 °C, the leaching process is under the control of the shrinking core model of the surface chemical reactions. The calculated activation energy of the leaching reaction is equal to 42 kJ/mol. The model of the leaching process can be described by the following equation: 1−1−x1/3=k0⋅(C)0.6181⋅r0−0.5868⋅SS0.6901exp⁡−42/RT]t. This demonstrates that an ammonium citrate solution can be used in the leaching process of zinc in smithsonite as an effective and clean leaching agent.

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Section: Optimal Experimental Designmentioning

confidence: 99%

Investigation of the Leaching Kinetics of Zinc from Smithsonite in Ammonium Citrate Solution

Chen,

Wu,

Wang

2024

Metals

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“…At present, chromium slag is treated by reduction, stabilization, and comprehensive utilization processes around the world [10][11][12][13][14]. Within these treatment processes, secondary wastes are generated that cause environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Understanding Chromium Slag Recycling with Sintering–Ironmaking Processes: Influence of Cr2O3 on the Sinter Microstructure and Mechanical Properties of the Silico–Ferrite of Calcium and Aluminum (SFCA)

Xu,

Ma,

Liu

et al. 2024

Molecules

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Chromium slag is a solid waste of chromium salt production, which contains highly toxic Cr(VI) and significant amounts of valuable metals, such as Fe and Cr. Recycling chromium slag as a raw sintering material in sintering–ironmaking processes can simultaneously reduce toxic Cr(VI) and recover valuable metals. A micro-sintering experiment, compressive strength test, microhardness test, and first-principles calculation are performed to investigate the influence of Cr2O3 on the sintering microstructure and mechanical properties of the silico-ferrite of calcium and aluminum (SFCA) in order to understand the basis of the sintering process with chromium slag addition. The results show that the microstructure of SFCA changes from blocky to interwoven, with further increasing Cr2O3 content from 0 wt% to 3 wt%, and transforms to blocky with Cr2O3 content increasing to 5 wt%. Cr2O3 reacts with Fe2O3 to form (Fe1−xCrx)2O3 (0 ≤ x ≤ 1), which participates in forming SFCA. With the increase in Cr doping concentrations, the hardness of SFCA first decreases and then increases, and the toughness increases. When Cr2O3 content increases from 0 wt% to 3 wt%, the SFCA microhardness decreases and the compressive strength of the sintered sample increases. Further increasing Cr2O3 contents to 5 wt%, the SFCA microhardness increases, and the compressive strength of sintered sample decreases.

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“…Different extraction methods, such as acid leaching, 13,14 salt-solution leaching, 15 and roasting-leaching, 16,17 have been extensively studied for the removal of heavy metals from solid waste, especially for the water-soluble and acid-soluble heavy metals. However, no extraction method has been reported to date for lattice-incorporated heavy metals.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, investigating the separation process of lattice-incorporated Cr(VI) from CaCO 3 is essential to mitigate the potential environmental risks presented by CrĲVI)-containing waste in CaCO 3 -containing environments. Different extraction methods, such as acid leaching, 13,14 salt-solution leaching, 15 and roasting-leaching, 16,17 have been extensively studied for the removal of heavy metals from solid waste, especially for the water-soluble and acid-soluble heavy metals. However, no extraction method has been reported to date for lattice-incorporated heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Separation of lattice-incorporated Cr(vi) from calcium carbonate by converting microcrystals into nanocrystals via the carbonation pathway based on the density functional theory study of incorporation energy

Liu

Chen

et al. 2022

Environ. Sci.: Nano

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Recovery of chromium from residue of sulfuric acid leaching of chromite

Cited by 25 publications

References 38 publications

Investigation of the Leaching Kinetics of Zinc from Smithsonite in Ammonium Citrate Solution

Investigation of the Leaching Kinetics of Zinc from Smithsonite in Ammonium Citrate Solution

Understanding Chromium Slag Recycling with Sintering–Ironmaking Processes: Influence of Cr2O3 on the Sinter Microstructure and Mechanical Properties of the Silico–Ferrite of Calcium and Aluminum (SFCA)

Separation of lattice-incorporated Cr(vi) from calcium carbonate by converting microcrystals into nanocrystals via the carbonation pathway based on the density functional theory study of incorporation energy

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