The leaching kinetics of cadmium from hazardous Cu-Cd zinc plant residues

Li, Meng; Zheng, Shili; Liu, Biao; Du, Hao; Dreisinger, David; Tafaghodi, Leili; Zhang, Yi

doi:10.1016/j.wasman.2017.03.039

Cited by 33 publications

(7 citation statements)

References 15 publications

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“…In a heterogeneous solid/liquid leaching reaction system, the soluble reactants diffuse across the interface and/or through the solid layer first (Zhang et al, 2016;Li et al, 2017;Tao et al, 2021). The shrinking core model assumes that the solid particles used in the experiments gradually shrink during the leaching process, leading to the formation of a porous layer on the surface of the unreacted core.…”

Section: Kinetic Study Of Leaching Processmentioning

confidence: 99%

A study on the dissolution kinetics of iron oxide leaching from clays by oxalic acid

Arslan¹

2021

Physicochem. Probl. Miner. Process.

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Clay is widely used in a number of industries due to its special properties like fine particle size, brightness and whiteness, chemical inertness, platy structure, etc. In this study, the general characteristics of clays have been investigated by XRF, XRD, FT-IR, TG-DTA and SEM. The presence of iron as an impurity decreases its commercial value due to giving unwanted colors to clay mineral. Therefore, the dissolution capacity of clay ore was investigated by oxalic acid leaching. Under optimized leaching conditions (0.8 M oxalic acid concentration, 85°C reaction temperature, 1.75 ambient pH, -106+75 µm particle size, 15% w/v solids concentration and 150 min. leaching time) with 250 rpm stirring, 83.90% of Fe2O3 was removed. The amount of iron oxide, the main impurity in the clay, has been reduced from 2.70 to 0.40%. The iron dissolution kinetics was mainly controlled by internal diffusion control of shrinking core model and activation energy, Ea, of 26.29 kJ/mol was obtained for the process. The results also showed that the studied clays have adequate characteristics for ceramics industry, earthenware and porcelain production.

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Section: Kinetic Study Of Leaching Processmentioning

confidence: 99%

A study on the dissolution kinetics of iron oxide leaching from clays by oxalic acid

Arslan¹

2021

Physicochem. Probl. Miner. Process.

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“…If the leaching is controlled by diffusion through the product layer, it will follow the rate equation, 23 expressed in eqn (2) . 1 − (2/3) X − (1 − X ) 2/3 = k d t …”

Section: Methodsmentioning

confidence: 99%

“…If the leaching is controlled by the chemical reaction at the surface of the solid particles, it will follow the rate equation, 23 expressed in eqn (3) . 1 − (1 − X ) 1/3 = k r t where X is the fraction reacted for iron; k d and k r are the rate constants for diffusion through the product layer and chemical reaction at the surface of the solid particles (min −1 ), respectively, and t is the leaching time (min).…”

Section: Methodsmentioning

confidence: 99%

Leaching of iron from copper tailings by sulfuric acid: behavior, kinetics and mechanism

et al. 2021

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“…Without SO 4 2− and H + , Fe 3+ can be hydrolyzed to form H + [31], further promoting the dissolution of dolomite and other phases, which accounts for the leaching ratios of Mg, Ca, and Al without H 2 SO 4 . When H 2 SO 4 is added into the immersion liquid, the Ca 2+ will combine with SO 4 2− and further precipitate in the form of CaSO 4 due to the extremely low solubility of CaSO 4 [32,33], decreasing the leaching ratio of Ca. The higher the H 2 SO 4 concentration in immersion liquid is, the more insoluble CaSO 4 will be formed, the less Ca 2+ in lixivium will be, and the lower the leaching ratio of Ca will be.…”

Section: Effect Of H 2 So 4 On the Dissolution Of Various Mineralsmentioning

confidence: 99%

Dissolution Behaviors of Minerals in Tellurium–Bismuth Ore During Oxidic–Acidic Leaching

Shao

Diao

et al. 2021

J. Sustain. Metall.

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The dissolution behaviors of various minerals in the tellurium-bismuth ore during oxidic-acidic leaching were investigated systematically in this work. The Te-Bi phase in the ore distributes in network shape, triangular shape, tree shape, strip shape, bulk shape, sparse granule, flake shape, crescent, etc., which are closely intercalated with FeS, FeS 2 , and CaCO 3 •(Mg,Fe,Mn) CO 3 . Under suitable conditions, 95.61% Te and 95.77% Bi can be recovered. Within 20 min of the initial leaching, most of dolomite and Te-Bi phase dissolve rapidly. With the extension of leaching time, a large amount of rod-shape CaSO 4 particles form, attach on the surface of the tellurium-bismuth ore particles, and then grow and coarsen. The (Mg,Fe,Al)(Si,Al) O x (OH) y phase dissolves mainly within 60 min. Fe-S phase can be corroded but cannot dissolve completely. SiO 2 cannot dissolve at all. Besides, H 2 SO 4 and Fe 3+ play a significant role on the dissolution of various minerals in the ore. Without Fe 3+ or H 2 SO 4 in immersion liquid, Te and Bi are difficult to be leached into the lixivium from the tellurium-bismuth ore. As H 2 SO 4 concentration and Fe 3+ concentration increase, Te-Bi phase and Fe-Mg-Al-Si-O phase gradually dissolve, the Fe-S phase can be corroded obviously but cannot dissolve, and the Si-O phase has no change. The dissolution of dolomite is mainly controlled by H 2 SO 4 .

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The leaching kinetics of cadmium from hazardous Cu-Cd zinc plant residues

Cited by 33 publications

References 15 publications

A study on the dissolution kinetics of iron oxide leaching from clays by oxalic acid

A study on the dissolution kinetics of iron oxide leaching from clays by oxalic acid

Leaching of iron from copper tailings by sulfuric acid: behavior, kinetics and mechanism

Dissolution Behaviors of Minerals in Tellurium–Bismuth Ore During Oxidic–Acidic Leaching

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