machines for recovery of iron from slag
Iron and copper recovery from copper slags through smelting
To recover metal from copper slags, a new process involving two steps of oxidative desulfurization followed by smelting reduction was proposed in which one hazardous waste (waste cathode carbon) was used to treat another (copper slags). The waste cathode carbon is used not only as a reducing agent but also as a fluxing agent to …
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Control of Slag and Insoluble Buildup in Ladles, Melting and …
Slag Formation: The formation of slag in the melting of ferrous metals in the foundry is inevitable. The composition of slag varies with the type of melting process used and the type of iron or steel being melted. The cleanliness of the metallic charge, often consisting of sand-encrusted gates and risers from
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An Overview of Recovery of Metals from Slags
The effect of nozzle diameter and modified Froude number on the gas-copper slag-iron interaction was investigated. ... with 54.90% iron recovery and 74.43% sulphur removal after dry magnetic ...
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Harmful Effects of Molten Metal Oxidation
6) Iron oxide-free slag eliminates slag line erosion in furnaces. 7) Iron oxide-free slag stops sulfur reversion in ductile iron. 8) Iron oxide present in slag must be chemically reduced by special materials added to the slag …
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Measures to Decrease and Utilize Steelmaking Slag
Steelmaking slag is artificially produced to remove, among others, the phosphorus from molten steel; approximately 120 kg of slag is formed per ton of steel. At present, steelmaking slag is mostly used for road construction and civil engineering materials. However, the slag cannot be sold at a high price and, in advanced countries, …
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Recovery of scandium and neodymium from blast furnace …
1500 C, producing molten iron and molten slag. World production of iron slag is estimated at 25–30% of crude (pig) iron production, and in 2019, world iron slag production was estimated to be between 320 and 384 million tons. It is esti-mated that about 90% of produced BF slag is utilized and about 10% is disposed of in land lls.4 Different ...
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Metals | Free Full-Text | Optimization of Iron Recovery …
Based on the research group's previous research on BOF slag oxidation, this paper explores the optimal magnetic separation process for the strongly magnetic MgFe 2 O 4 phase in oxidized BOF …
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Study of Steel Slag Eroded by Oxalic Acid and Recovery of …
The effective resource utilization of steel slag from bulk solid waste can achieve good social, environmental and economic benefits. In order to restrain the volume expansion of steel slag and apply it as a building material, in this work, oxalic acid was used for the treatment of steel slag, and the mechanism of oxalic acid restraining the expansion of steel slag …
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Precious metal recoveries in secondary copper smelting with high
The iron-to-silica ratio increases somewhat with the decreasing oxygen partial pressure. As the SiO 2 level in slag stayed relatively constant at 30–33 wt% (except at the highest pO 2 = 10 −5 atm, where SiO 2 decreased to ~ 25 wt%), iron behavior in slag was mostly responsible for the changes in the Fe/SiO 2 ratio. The behavior of iron was ...
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Slag recycling
The terms blast furnace slag (BFS) and granulated blast furnace slag, as well as LD slag and electric furnace slag are used for finer distinctions. With high-quality iron ore grades with an iron content of 64 to 67 %, a blast furnace typically produces about 0.25 to 0.30 t of slag per t of pig iron.
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Minerals | Free Full-Text | Recovering Iron from Iron Ore Tailings …
Iron ore tailings (IOTs) are a form of solid waste produced during the beneficiation process of iron ore concentrate. In this paper, iron recovery from IOTs was studied at different points during a process involving pre-concentration followed by direct reduction and magnetic separation. Then, slag-tailing concrete composite admixtures …
ادامه مطلبDevelopment of Low-Emission Integrated Steelmaking Process
Economics of slag heat recovery from ferronickel slags. COM 2010 Conference of Metallurgists, Vancouver, October. Kappes H, Paul Wurth's contribution to an energy optimized iron making technology. In: Proceeding of METEC InSteelCon, Düsseldorf, 2011. Motz H, Ehrenberg A, Mudersbach D (2013) Dry solidification with heat …
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A Thermodynamic and Experimental Assessment of the Recovery …
With the increases in the costs of iron and copper ores, the incongruity between the significant imports of these ores into China and the ongoing accumulation of unused copper slag has greatly increased. Even so, there are few low-value methods for the utilization of copper slag. The present work demonstrates the processing of this material …
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Recovery of Valuable Metals from Nickel Smelting Slag Based on …
The reason why the mixed addition of carbon is not good for the flotation recovery of nickel from nickel slag is that the carbon can reduce the iron olivine in the slag to elemental iron (Fe 3 O 4 + C = 3FeO + CO, FeO + C = Fe + CO). Moreover, with the addition of carbon, a large amount of nickel in the slag will be reduced (NiO + C = Ni + CO).
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A physico-chemical separation process for upgrading iron from …
A large amount of waste copper slag containing about 35–45 wt.% iron is generated every year from pyrometallurgical processes for producing copper from copper concentrate. Recovery of iron from the waste copper slag is of great interest for comprehensive use of mineral resource and reduction of environmental problems. In this …
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Recovery of iron from copper slag via modified roasting in CO–CO
A novel technology, modified roasting in CO–CO2 mixed gas and magnetic separation, was presented to recover iron from copper slag. The effects of various parameters such as dosage of flux (CaO), gas flowrate of CO and CO2, roasting temperature, roasting time, particle size of modified slag and magnetic flux density on …
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A Study on the Selective Leaching of Valuable Metals and the
The selective leaching of copper from the copper smelting slag by the oxygen pressure leaching process at low acidity was feasible. This leaching could transform over 99 wt% of iron in copper smelting slag into the hematite phase, with a high recovery rate of iron and no sulfur dioxide or greenhouse gases generated in the process.
ادامه مطلبElement Distribution and Migration Behavior in the Copper Slag
Graphite crucible was cut by a chainsaw to obtain slag and ingot iron. The mass of slag, ingot iron, and carburizing powder was then tested. Then, chemical composition, mineral phase, element distribution, and crystal structure of slag, collected dust or iron ingot were analyzed by XRD, and SEM metallurgical microscope. 3 Results and Discussion
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Recovery of iron from copper slag via modified roasting …
The optimum conditions for recovering iron by oxidizing roasting and magnetic separation are as follows: calcium oxide content of 25 wt.%, mixed gas flow …
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Sustainability | Free Full-Text | Re-Use of Silico-Manganese Slag
The world's rapidly growing demand for raw manganese has made it increasingly important to develop methods for the economic recovery of manganese from secondary sources. The current study aims to present possible ways for the recycling and reuse of silico-manganese slag landfilled in Tulcea, City on the Danube River close to …
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Recovery of Precious Metals (Au, Ag, Pt, and Pd) from Urban
With the aim of investigating deportments of precious metals in pyrometallurgical processing of waste electrical and electronic equipment, the distributions of selected precious metals (gold, silver, platinum, and palladium) between copper matte and three different silica-saturated slags (pure FeOx-SiO2, FeOx-SiO2-Al2O3, and FeOx …
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Application of iron and steel slags in mitigating greenhouse gas
The following difficulties and obstacles exist in the recovery of energy from molten slag (Barati and Jahanshahi, 2020): (1) the low thermal conductivity of slag hinders the full extraction of heat; (2) slag is corrosive to the recovery equipment; (3) the waste heat recovery of hot slag is not conducive to the formation of the glass phase, and ...
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Residual Processing in the European Steel Industry: A …
Pig iron as the main product and zinc from the off-gas dust represent the recovered metals leading to a factor of 0.5 for the performance indicator number 2. The OxyCup ® slag can be used for road construction, so no waste is generated. The integrability was evaluated with 0.5 [] where iron and zinc recovery rates of 99% and > …
ادامه مطلبMinerals | Free Full-Text | Recovery of Iron from Copper Slag …
The Fe3O4 and Fe2SiO4 in copper slag were successfully reduced to metallic iron by coal-based direct reduction. Under the best reduction conditions of 1300 °C reduction temperature, 30 min reduction time, 35 wt.% coal dosage, and 20 wt.% CaO dosage (0.75 binary basicity), the Fe grade of obtained iron concentration achieved 91.55%, and the …
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Metallurgical resource recovery from waste steelmaking …
PMID: 34429031. DOI: 10.1080/09593330.2021.1968957. Abstract. Steel slag from an electric arc furnace (EAF) may contain significant amounts of oxides of valuable metals. …
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Control of Copper Content in Flash Smelting Slag and the Recovery …
To determine slag properties and the factors influencing these properties for optimization of operating conditions in the copper flash smelting process, the composition and microstructures of the quenched smelting and converting slags have been analyzed. Thermodynamic software FactSage 8.2 has been used to investigate the effects of matte …
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Minerals | Free Full-Text | Recovery of Iron from Copper Slag …
The Fe3O4 and Fe2SiO4 in copper slag were successfully reduced to metallic iron by coal-based direct reduction. Under the best reduction conditions of 1300 °C reduction temperature, 30 min reduction time, 35 wt.% coal dosage, and 20 wt.% CaO dosage (0.75 binary basicity), the Fe grade of obtained iron concentration achieved …
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Hydrometallurgical nickel and cobalt plants and processes
For nickel, cobalt, and by-product recovery, our portfolio includes electrowinning, precipitation, hydrogen reduction, and crystallization technology options, enabling nickel and cobalt to be recovered at the purity level needed, for example in battery manufacturing. Iron and manganese removal Iron can be removed either in atmospheric or pressure
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Pyrometallurgical recycling of electric arc furnace dust
Approximately 95% of the input iron is recovered as pig iron with a much higher market value than the typical iron/slag mix generated from a Waelz kiln (The PIZO ® Advantage, 2016). Meanwhile, there is very low loss of iron product to the crude zinc oxide (<1.5 wt% iron in the oxide) and to the slag ( Bratina and Lenti, 2008 ).
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Minerals | Free Full-Text | Stepwise Utilization Process to …
Waste copper slag is a typical hazardous solid waste containing a variety of valuable elements and has not been effectively disposed of so far. In this paper, a stepwise extraction process was proposed to recover valuable elements (copper, iron, lead and zinc) from waste copper slag. The specific procedures are as follows: (1) A flotation process …
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