leaching process modified
Thermal and Mechanical Activation in Acid Leaching Processes …
The acid leaching is known as the most efficient in which thermal and mechanical activation are included for improving the performance of the process. The objective of this review is to give a comprehensive insight on the production of the alumina from thermally or mechanically activated clays and coal fly ash by hydrochloric, sulfuric, …
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Response surface design for nickel recovery from
A modified sulfation-roasting-leaching process for recovering Se, Cu, and Ag from copper anode slimes at a lower temperature. 2019, Journal of Environmental Management. Show abstract. Copper anode slimes are source of valuable elements such as selenium, tellurium, copper, silver, lead, antimony, tin, gold, and platinum group metals. …
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A novel process for extracting tellurium from the calcine of copper
The solubility of acid leaching process is low and it is difficult to treat high tellurium-bearing materials. In the alkaline leaching process, lead and copper are easily dissolved when leaching tellurium, which leads to the difficulty of separation and recovery. ... A modified sulfation-roasting-leaching process for recovering Se, Cu, and Ag ...
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Minerals | Free Full-Text | Removal of Potassium and …
In order to explore the commercialized applications of the low-grade bauxite in the refractory industry, a calcination integrated with acid leaching method was adopted to remove the potassium (K) and …
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Leaching Process
The Leaching process is a universal process – Water will leach the components of any material it comes in contact with, from its surface or the interior of the material (based on the porous nature of the material). Using this process, the ore of metal can be concentrated by causing a chemical reaction with a reagent which would lead to the ...
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Enhance selective separation of vanadium and iron from acid-leaching
To address the problems of low saturated adsorption capacity of the chelate resin and enhance selective separation of vanadium and iron when vanadium shale acid leaching solution was treated by ion exchange resin, DS418 resin, an innovative resin was prepared by surface modification of D418 resin with sulfamic acid.FTIR, XPS and the …
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Characteristics and factors that influence heavy metal leaching …
The results obtained by fitting the experimental data (Tables 4 and 5) showed that the control mechanisms for the metal leaching process differed for different leaching conditions. The process for the release of Zn from the ZSCs showed the best fit with Eq. in the sequential leaching system at pH 4.5 and pH 7.0, indicating that the leaching of ...
ادامه مطلبLeaching of ilmenite to produce titanium based materials: a review
Leaching in weak acids like citric acid requires low acid concentration. This process extracts more titanium than iron but consumes more energy. As with weak acids, leaching in alkaline medium also extracts comparatively more titanium than iron, but requires an additional acid treatment step to obtain the final products.
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Modifying the LEACHM model for process-based …
leaching using a process-based model. We modified with relative improvements of 63.5 and 76.5 %, respec- LEACHM model for use in Andosols, which are char- tively, over the …
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The evolution of different dissolved organic matter
The results showed that the leaching process of HMs was not a simple first-order reaction, but rather a process that showed different patterns depending on the element (Zheng et al. 2012). Fig. 2 Curve fitting between the cumulative release of heavy metals in the leachates and leaching time
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A modified process for leaching of ilmenite and …
This study presents a modified method for producing nano-sized titanium dioxide. The method includes a combination of alkali decomposition of ilmenite and …
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Leaching of Metals from e-Waste: From Its Thermodynamic …
The aim of this study is to design and develop an efficient leaching process based on a fundamental and theoretical thermodynamic analysis and the optimization of the operation parameters via the response surface methodology (RSM). Using this methodology, the design of a leaching process for the recovery of copper, silver, and lead from highly …
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Recovery of Aluminum from Molybdenum Extraction Residue of …
It can be inferred that the water leaching process of aluminum belongs to diffusion control. Fig. 10. Arrhenius plot for the leaching of aluminum. Full size image. The solution obtained by the process of hydroxide roasting and water leaching is an alkaline system, in which the valuable metals are aluminum and molybdenum. The concentration …
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Efficient Oxidation Approach for Selective Recovery of
Developing a green and efficient approach for recovering Li from cathode materials is important in recycling spent LiFePO4 batteries. A facile and efficient oxidation process was developed to selectively recover Li from spent LiFePO4 batteries. The common oxidant NaClO was used to avoid using acid or alkali in the leaching process. …
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Extraction of Indium from By-products of Zinc Metallurgy by
The leaching process of the ultrasonic wave on the indium not only reduces the addition of the reagent, but also increases the leaching rate of the indium. ... Extraction of gallium, indium and thallium from aquatic media using amino silica gel modified by gallic acid. Microchim. Acta 172(1–2), 137–145 (2011)
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Leaching of cathode materials from spent lithium-ion batteries by …
The leaching efficiency of Li was highly dependent on these independent parameters, while interactions between process parameters were found to significantly affect the leaching efficiencies of Ni, Co, and Mn. 80.2%, 91.5%, 93.2% and 90.3% of the Li, Ni, Co, and Mn, respectively, can be simultaneously recovered from the spent cathode …
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Zinc Recovery from Steelmaking Dust by …
(Modified Zincex Process) is a modification and simplification of th e former process (Zincex) using atmospheric leaching (H 2 SO 4 solution), solvent extraction and conv entional electrowinning ...
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Leaching kinetics and predictive models for elements
The results of the kinetic mechanism study showed that the shrinking core model can be used to describe the leaching process, and the leaching rate was controlled by the mixed controlled mechanism (diffusion and chemical reaction). The activation energies of copper, cobalt and iron leaching were 24.0, 28.1 and 19.5 kJ/mol, …
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Decopperization mechanism of copper anode slime enhanced by …
The mechanism of the leaching process was explored by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Scanning electron microscope energy-dispersive spectroscopy (SEM-EDS). ... A modified sulfation-roasting-leaching process for recovering Se, Cu, and Ag from copper anode slimes at a lower temperature. J Environ …
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Recycling and reutilization of LiNi0.6Co0.2Mn0.2O2 cathode
With the permeation of LIBs into electric vehicles, the recycling of spent LIBs appears inevitable from the perspective of health, economic, and environmental protection. In this work, a facile process was proposed to realize the recycling and reutilization of valuable metals from spent LIBs. By ammonia leaching, co-precipitation, and solid …
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Temporal Process and Leaching Characteristics for …
Static and dynamic adsorption experiments and filler composition detection are adopted to address the following research questions: (i) the process method of …
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High-efficiency recycling method for Mo and Ni from spent …
The spent catalyst residue from the water leaching process was further leached using H 2 SO 4 solution to transfer Ni from the residue into the leaching solution, and NiSO 4• 2H 2 O was obtained from the leaching solution via evaporation and crystallization. The parameters of the soda roasting, leaching, and solvent extraction …
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Leaching of Metals from e-Waste: From Its …
The thermodynamic parameters for implementing the leaching process should not be modified or studied from another point of view since it has been demonstrated that the …
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High-efficiency leaching of Al and Fe from fly ash for preparation …
The leaching efficiencies of Al and Fe in CFB fly ash were up to 96.75% and 97.64% by combined HCl-H 2 SO 4 leaching process. The optimal molar ratios of Al 3+ /SO 4 2− and Al 3+ /Fe 3+ for the turbidity and UV 254 removal were 10:1 and 10:1, respectively, due to the three-dimensional chain-net structure and the highest [Al + Fe] b …
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Evaluating the applicability of a modified toxicity …
Using modified TCLP procedures, the parameters investigated were the acid concentration, leaching duration, particle size of the crushed waste, liquid to solid ratio, …
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Reaction Chemistry & Engineering
Received 9th July 2020, Accepted 3rd August 2020. and 92.7%, respectively, and can continue to increase with the extension of time. The successful run indicated that the …
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Roasting and Leaching Behavior of Nickel Laterite Ore
The success of the sulfation-roasting-leaching process depends on iron behavior. Due to its higher amount, it is sulfated before nickel. However, the stability of iron sulfates is lower than the nickel sulfate and during the decomposition of iron sulfate, the sulfur xide (SO 3) is liberated and reacts with nickel to form nickel sulfate.This …
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Preparation of synthetic rutile from reduced ilmenite through the
A modified process for leaching of ilmenite and production of TiO
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Immobilization of cadmium in river sediments by different modified
Modified nanoscale zero-valent iron (NZVI) exhibited great potential for the remediation of heavy metal contaminated river sediments, but its mechanisms and environmental risks are still unclear. This study systematically discussed the performance and the mechanisms of modified NZVI materials, i.e., sodium alginate-coated NZVI …
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Recovery of scandium from bauxite residue—red mud: a review
Red mud is a slimy caustic residue generated from alumina refining of bauxite ores. During the alumina extraction process, about 35 %–40 % of the bauxite ores go into the residue as highly alkaline red mud slurry (pH 10.0–12.5) which contains 15 %–40 % of solid phase in volume [1, 2].Depending on the quality of bauxite ores, producing 1 t …
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