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Membrane techniques are efficient at removing halide DBP precursors from water. Electrochemical techniques remove halides but do not effectively remove organic DBP …
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The results obtained show that the leaching studied presents a better removal of iron oxide after 150 min of treatment at temperature 90°C with a 3 mol/L, a concentrate obtained final of 99.16% ...
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In this study, the ammonium aluminum sulfate crystallization–recrystallization and ion exchange–calcination method is adopted to effectively separate aluminum and iron in a …
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This study reports a leaching process along with a novel physical pretreatment technique to remove iron impurities from kaolin using oxalic acid. A detailed examination of the physical properties of the minerals confirmed that almost none of the leaching-resistant iron oxides, specifically hematite, was completely interlocked with …
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Iron Removal by physical-chemical ways. Iron is one of the most abundant metals of the Earth's crust. It occurs naturally in water in soluble form as the ferrous iron (bivalent iron …
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where x is the iron removal rate, θ is the amount of iron in the leached solid sample and α is the amount of iron in ore sample.. 3 Results and discussion 3.1 Kinetic analysis of iron leaching process. The shrinking core model is the most commonly used liquid–solid phase non-catalytic reaction model [].In the interface reaction model without solid products, the …
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In the present study, roasting-induced phase change and its influence on phosphorus removal via leaching has been investigated for high-phosphorus iron ore. The findings indicate that phosphorus in the ore is associated with goethite and exists mainly in amorphous Fe3PO7 phase. The phosphorus remains in the amorphous phase …
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@article{Nan2022CleanIR, title={Clean iron removal from zinc leaching solution by shear enhancement: Industrial pilot campaign and strengthening mechanism}, author={Tianxiang Nan and Jian‐guang Yang and Kaixuan Hu and Wei‐Jian Long and Shiyang Tang and Qiang Zhu and Jiang Liu and Chao-bo Tang and Weizhi Zeng}, journal={Journal of …
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The method of the static leaching experiment for the iron tailings was developed from the method of the leaching experiment for antimony ores described by Hu et al. (2016). The pH range of the leachate of 2 to 9.5 (different experiments for initial pH of 2, 4, 6, 7.5, and 9.5) was selected to study the leachability of metals in the tailings ...
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The best combination for leaching gold and silver is the system [Bmim]Cl/NaI/HSO 5 –, which can quantitatively leach silver and 85% of gold, with only limited codissolution of …
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Mine tailings deposits are often overlooked by the industry, posing significant environmental challenges due to chemical hazards and inadequate maintenance. Nevertheless, such mineral deposits hold considerable economic potential for processing, and the adoption of innovative technologies may also address critical chemical and …
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The obtained PLS in the leaching of oxide ores contains a number of impurities such as iron, Mn, Mg, Ca, SiO 2, etc. Presence of iron in electrolyte can reduce zinc production and reducing current ...
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Alkali-leaching and acid-leaching were proposed for the dephosphorization of Changde iron ore, which contains an average of 1.12% for phosphorus content. Sodium hydroxide, sulfuriced, hydrochloric and nitric acids were used for the preparation of leach solutions. The results show that phosphorus occurring as apatite phase could be …
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A process for biological removal of iron from quartz sands, kaolins and clays was developed in which these industrial minerals were leached at 90°C with lixiviant produced as a result of the ...
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The smelted alloy is then atomized to produce fine particles sized between 20 and 100 μm, subjected to hydrometallurgical acid leaching to remove the iron, extract the base …
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Dissolution of metals in organic solvents is relevant to various application fields, such as metal extraction from ores or secondary resources, surface etching or polishing of metals, direct synthesis of organometallic compounds, and separation of metals from other compounds. Organic solvents for dissolution of metals can offer a solution …
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restrictions on cy anidation, interest in halide-based gold leaching processes was r enewed in the 1990s ( Tran et al., 2001). The chronology of using halides as gold lixiviants is concluded in
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Our results have revealed that phosphoric acid is a good leaching agent for iron removal from quartz sand because of its leaching efficiency up to 77.1%. It is about 30%–40% higher than the other comparable methods, and leaching time consumption is less than the others. The optimal values of operating parameters, such as types and ...
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It is more difficult to apply halide leaching as special stainless steel and rubber-lined equipment is required and chlorine gas used in the process is highly poisonous (Cui and Zhang 2008 ...
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This paper aims to review the state of research on halide removal techniques focusing on the development during the past 10 years (2012–2021). The techniques were clustered …
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In this paper, the kinetics of pressure leaching for purification of metallurgical grade silicon with hydrochloric acid was investigated. The effects of particle size, temperature, total pressure, and concentration of hydrochloric acid on the kinetics and mechanism of iron removal were studied. It was found that the reaction kinetic model …
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The removal of iron from leaching circuits is a common problem in the hydrometallurgical processing of non ferrous metals. Among the currently available processes, hematite precipitation is the ...
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The halide system offers high leaching rates (Zhang et al., 2012). However, halogens have proved to be very reactive with other ore minerals, especially sulfides. Hence under typical halide-leaching conditions, reagent consumptions would be very high if the ore contains significant sulfide minerals (Aylmore, 2005). Halide system was limited to ...
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Calcination and acid leaching of coal kaolin were studied to determine an effective and economical preparation method of calcined kaolin. Thermogravimetric-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD) demonstrated that 900℃ was the suitable temperature for the calcination. Leaching tests showed that hydrochloric acid was more …
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This paper reports the phosphorus removal of high phosphorus oolitic iron ore by acid leaching and its influence factors. The experimental ore is Exi high phosphorus oolitic iron ore with 0.5% phosphorus, 51.7% iron and 0.34% sulphur. After acid leaching, the P content decreases to about 0.07%, the iron loss during acid leaching is about 0.18%, …
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P.W. Zhu et al., Influence of acid leaching and calcination on iron removal of coal kaolin 319 ducted by two different methods. The first method involved the use of hydrogen chloride to leach iron from RCK, and the other involved the use of oxalic acid to leach iron from CCK. Leaching tests were conducted in a 50-mL glass beaker
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Thiourea leaching of gold, despite first being reported in 1941 [], has never been clearly established into industry.Only a few industrial applications were reported between 1984 and 1992 [] although more recently, Birloaga et al.[] report on the development of a pilot plant.The plant, part of the FENIX project, consists of two …
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Semantic Scholar extracted view of "Iron removal in production of purified quartz by hydrometallurgical process" by A. Tuncuk et al. ... Pyrolusite leaching slag is a Fe-containing slag generated from pyrolusite leaching process with SO2. Recovery of iron from the slag not only has economic benefit, but also prevents the secondary …
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The halide leaching method has the advantages of a high recovery rate and less toxicity, ... separation and material disassembly: When e-waste is at the recycling site, it is manually sorted to remove the toxic components such as batteries, UPS battery systems, Freon and toner cartridges that should not be crushed and require special …
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Compared with the regular leaching, only 40 min were required for the ultrasound-assisted leaching process to achieve an iron removal rate of up to 74%. Under the optimal parameters, SiO2 content ...
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