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In this study, the effect of citric acid on iron leaching from titanium gypsum (TiG) was systematically investigated. The conditions for the leaching of valuable metals were …
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However, after approximately 7 days of incubation, ferrous iron (Fe²⁺) concentrations were gradually increased in leaching assays with NaCl, indicating that iron oxidation activity over time ...
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Leaching processes are classified based on the method used for the leaching of metals, i.e. hydrometallurgy (chemicals) or bio-hydrometallurgy (microbial mediated leaching). …
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Approximately 2.0–3.0 t of copper slag (CS) containing 35%–45% iron is generated for every ton of copper produced during the pyrometallurgical process from copper concentrate. Therefore, the recovery of iron from CS utilizes a valuable metal and alleviates the environmental stress caused by stockpile. In this paper, a new method has been developed to realize the …
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The findings of this investigation confirm the efficiency of the oxalic acid leaching process for removing iron from red clay samples; it indicates 150 min, a temperature of 100 °C, and a 1.0 M concentration of oxalic acid are suitable for industrial applications, offering an effective method for iron removal from red clay.
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Agitation leaching is a promising technology in hydrometallurgy for treating copper–cobalt oxide ores. In this work, the behavior of oxide ores containing around 2.3% Cu and 0.3% Co received ...
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meet the industrial requirements. Although many studies have investigated the leaching process of iron-containing minerals, most of these are limited to qualitatively predicting the iron phase changes in the residue sample. The quantitative explanation of iron-containing mineral behavior is still not well understood. In this paper, the e ects ...
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Traditional leaching and recovery technology for copper tailing focuses on copper but neglects the leaching of iron. With the increase in applications and demands of iron-containing materials for environment, understanding the leaching …
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Dissolved iron exerts significant effects on mineral leaching, impurity removal, and solution purification in the zinc hydrometallurgy process. To date, iron oxidation and migration behaviors are yet to be fully understood and …
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Leaching, a process where soluble substances are removed from a solid by washing with a solvent is a key method used to extract iron from ores and other materials. This article delves into the methods of leaching iron, its applications and the environmental implications …
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Leaching is the primary process in hydrometallurgy whereby the metal values of a solid metal-bearing material are transferred into an aqueous solution by the action of a lixiviant. Typically, …
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Despite being a major mining nation, China faces issues of wasteful practices, with substantial amounts of valuable elements lost during the processing of iron ore. This study addresses the urgent need for sustainable …
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It was found in this research that addition of sulfuric acid up to 0.8 ml/g with moisture 40 wt pct followed by roasting process at 700 °C for 30 minutes and leaching process at 80 °C for 30 ...
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In order to remove phosphorus element from steelmaking slag and decrease iron loss, malic acid was selected as the leaching agent to dissolve steelmaking slag. Firstly, the influences of different factors, such as malic acid concentration, slag particle size, temperature, liquid/solid ratio and stirring speed, on the leaching ratios of phosphorus and iron were studied. …
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7.2.2.1 Leaching process and mechanism. Leaching is the extraction of a soluble material from an insoluble solid by dissolution in a suitable solvent. The process of leaching encompasses the physical and chemical reactions that carry the contaminant away from the matrix in which slag is used as a substituting material.
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These optimized conditions ensured the maximum efficiency and effectiveness of the iron-leaching process. Furthermore, the product layer diffusion model, the reaction kinetic analysis and thermodynamic analysis provide a strong theoretical support for this technology. Through this work, the utilization efficiency of laterite nickel ore can be ...
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At , we provide versatile leaching methods suitable for your plant: from chloride to sulfate leaching and from atmospheric to pressure leaching. Our metallurgical knowledge and experience enable us to optimize design, process …
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Kinetics of the removing process were calculated by two models, and the results showed that the leaching process was controlled by the mixed shrinking core model, which was affected by both the ...
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Iron tailings usually contain As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn, some of which are highly toxic and carcinogenic. Leaching is the process of extracting soluble substances from solids using leaching agents (i.e., water, acid, alkali and salt solutions), and it is a crucial hydrometallurgical method for metals extraction from various solids (Ye et al., 2017; Zhang et …
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The process involves sieving and sodium carbonate leaching, enabling significant sulfur reduction from 5.12 to 0.81% and simultaneous enrichment of iron content from 47.12 to 55.27%. The sulfur content in the treated HPAL residue falls below the permissible level for the ironmaking industry, rendering it suitable for use as a low-grade iron ore.
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The solid phase remaining from the leaching process is a fine powder reached in silica, with potential use in other industrial segments. ... The leaching of the iron ore tailing (IOT) carried out with a 10.8 mol L-1 of HCl at a temperature of 80° for 120 min resulted in a 94% solubilization efficiency of iron. The leachate presented 11% Fe in ...
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Iron-bearing phases like calcium ferrite exhibit a modest increase in leaching over time, progressively elevating iron leaching rates while maintaining overall levels below 1 %. Between 5 and 30 minutes, the selectivity for calcium and magnesium declines as aluminum and iron phases leach into the solution, increasing their concentrations and ...
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In the process of ammonia leaching, compared with Co(OH) 2, Co(OH) 3 is difficult to form coordination compounds with ammonia in the solution, resulting in less leaching of cobalt. As a result, a reducing agent can be added to the ammonia leaching process to convert trivalent cobalt to divalent cobalt, strengthening the leaching of cobalt.
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The solid phase remaining from the leaching process is a fine powder reached in silica, with potential use in other industrial segments. The results indicate that the production of coagulants may be considered to extend the productive chain of iron ore extraction and to minimize the amount of tailings to be discharged in tailings dams or dry ...
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Iron leaching rapidly proceeded in the first 120 min, and then proceeded more slowly. The leaching of iron was 49.53% at 20 °C, and increased to 69.18% at 60 °C. ... During the leaching process, most of Fe 2 SiO 4 gradually disappeared, while peak intensity related to Fe 3 O 4 and CaFeSi 2 O 6 were relatively stable.
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It was reported that the leaching kinetics followed a shrinking core model. 25 Liu et al. studied the selective separation of REEs from iron by a selective pressure leaching process. In this study, REEs and Boron were effectively separated from the iron, especially with the addition of NaNO 3 promoter to decrease the level of iron in the ...
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The hydrometallurgical process of nickel laterite leavesa residue that still contains critical metals such as iron and nickel. Its utilization can improve overall process efficiency and reduce environmental damage. In this work, the recovery of nickel and iron from nickel residue resulting from the citric acid leach process has been carried out using the selective reduction …
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For this process, the term bio-oxidation is used because the solubilized metals such as iron and arsenic are not of economic value. ... Bellenberg S, Barthen R, Boretska M, Zhang R, Sand W, Vera M. Manipulation of pyrite colonization and leaching by iron-oxidizing Acidithiobacillus species. Appl Microbiol Biotechnol. 2015;99:1435–1449. doi ...
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A process was proposed for extracting REEs under mild conditions (50 °C, 0.5-M HCl, 20-g/L solid–liquid ratio), achieving an extraction recovery of approximately 80% for REEs, with aluminum and iron leaching rates kept as low as 5.16% and 6.03%, respectively.
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Sludge incineration ash (SIA), a by-product of sludge incineration, is a powdery material riches in Fe2O3, SiO2, CaO, Al2O3, MgO and P2O5. Extraction of Fe from SIA by acid leaching to prepare polymeric ferric chloride flocculant for water purification is a green and sustainable method to recycle SIA. In this study, the optimal synthesis conditions of SPFC …
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