Experimental and kinetic study of zinc leaching from metallurgical slag by 5-sulfosalicylic acid

Wang, Long; Gao, Hanyu; Song, Shimin; Xue, Na; Zhang, Jinxia; Yang, Siyuan; Liu, Cheng

doi:10.37190/ppmp/133833

Cited by 9 publications

(3 citation statements)

References 41 publications

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“…To quantitatively describe the influence of the liquid-solid ratio and leaching temperature on the kinetics of zinc leaching, a semi-empirical equation was proposed, as follows [23,24]:…”

Section: Leaching Kinetic Equationmentioning

confidence: 99%

Properties and Kinetics of Selective Zinc Leaching with Choline Chloride and Urea

et al. 2021

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A choline chloride-urea (ChCl-urea) deep eutectic solvent (DES) was used to experimentally investigate the secondary recovery of zinc from zinc-bearing dust sludge via a leaching process. The effects of varying the liquid–solid ratio, leaching temperature, stirring speed, and leaching time on the zinc leaching efficiency were determined, and the optimum values of these parameters were found to be 15:1, 90 °C, 400 rpm, and 600 min, respectively, at which a leaching efficiency of 86.87% was achieved. XRF and EDS analyses confirmed that the zinc content in the sludge decreased noticeably after leaching, while those of other elements did not, indicating the selective and efficient leaching of zinc. A study of the leaching kinetics showed that the reaction conforms to the nuclear shrinkage model without solid product layer formation, and the calculated apparent activation energy is 22.16 kJ/mol.

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“…To quantitatively describe the influence of the liquid-solid ratio and leaching temperature on the kinetics of zinc leaching, a semi-empirical equation was proposed, as follows [23,24]:…”

Section: Leaching Kinetic Equationmentioning

confidence: 99%

Properties and Kinetics of Selective Zinc Leaching with Choline Chloride and Urea

et al. 2021

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“…The inorganic acid leaching method, which utilizes an inorganic acid such as sulfuric acid, consumes a large amount of acid and produces a silica gel that is difficult to treat [13][14][15][16][17]. Organic acids are biodegradable and can reduce environmental pollution, making them a good choice as a leaching agent for zinc extraction [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Leaching Kinetics of Hemimorphite with 5-Sulfosalicylic Acid

Wen

Cao

et al. 2023

Metals

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The kinetics of leaching zinc from hemimorphite was investigated. The factors that influence hemimorphite leaching were also evaluated, and a kinetic model was built. In addition, scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) was used to investigate the changes of surface morphology before and after leaching. By decreasing particle size and increasing temperature, 5-sulfosalicylic acid concentration, and stirring speed, the leaching rate of hemimorphite can be enhanced. The shrinkage nucleus model describes the surface chemistry of leaching. The activation energy of hemimorphite by 5-sulfosalicylic acid in the leaching process was determined as 55.244 kJ/mol. The reaction rate based on the shrinkage nucleus model can be expressed by the semi-empirical formula:1−1−x1/3 =[k0C0.3385(r0)−0.6083(SS)0.4992exp(−55.244/RT)]t. At the condition of 50 °C of leaching temperature, 0.175 mol/L of 5-sulfosalicylic acid concentration, 82.5 μm of particle size and 650 rpm of stirring speed, the high leaching rates of zinc were obtained. After the reaction time of 15 min, the leaching rate of zinc reached more than 95%. According to the SEM-EDS results, the hemimorphite and leaching residue are distributed in blocks, but the particle size of the leaching residue is smaller, and the atomic concentrations of Zn and Si in the leaching residue are significantly lower than those in the hemimorphite, so the leaching effect is remarkable. Therefore, 5-sulfosalicylic acid solution would be an excellent leaching agent for zinc extraction from hemimorphite.

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“…The grade of the resulting magnetic fraction was 90.59% Fe with an iron recovery of 50.87%. In another investigation [36], it was shown that the pelletizing process is more suitable for recovering valuable metals from jarosite residues through direct reduction. The decomposition of zinc ferrite into ZnO and Fe 3 O 4 using a mixture of CO and Ar gas as reducing agents were investigated [37].…”

Section: Introductionmentioning

confidence: 99%

Technologically Sustainable Route for Metals Valorization from Jarosite-PbAg Sludge

et al. 2021

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By-products from zinc hydrometallurgy are classified as hazardous waste with strong leaching toxicities. Even though numerous research papers are dedicated to valorizing valuable metals in it, the primary management route is still disposal or partial reuse, such as the Waelz process. Presented experimental research investigates possibilities of sulfidization and further processing as a technologically sustainable route for valuable metals valorization from non-standard jarosite-PbAg sludge. The comprehensive thermodynamic analysis was done by HSC Chemistry®, through optimizing process parameters, i.e., temperature, sulfur addition, and selection of possible additives. Technological possibility of magnetic separation, flotation, and smelting of sulfidized material was also investigated; the results were below the values that allow practical application, due to the obtained texture of sulfidized jarosite, which does not allow the liberation of minerals. Smelting tests were performed on sulfidized jarosite with sulfur and without and with carbon as additive. By smelting sulfidized jarosite-PbAg sludge with added carbon in sulfidization stage at 1375 °C, obtained products were matte, slag, raw lead, and dust in which base, critical, and slag forming components were valorized. Valuable metals were concentrated in smelting products so as to enable further processing, which also could be interesting in the case of treatment of complex, polymetallic, and refractory primary materials, which represent a significant contribution to the circular economy.

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Experimental and kinetic study of zinc leaching from metallurgical slag by 5-sulfosalicylic acid

Cited by 9 publications

References 41 publications

Properties and Kinetics of Selective Zinc Leaching with Choline Chloride and Urea

Properties and Kinetics of Selective Zinc Leaching with Choline Chloride and Urea

Leaching Kinetics of Hemimorphite with 5-Sulfosalicylic Acid

Technologically Sustainable Route for Metals Valorization from Jarosite-PbAg Sludge

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