The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Francisco José Alguacil - One of the best experts on this subject based on the ideXlab platform.
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Recycling of copper Flue Dust via leaching-solvent extraction processing
Desalination and Water Treatment, 2014Co-Authors: Francisco José Alguacil, Irene García-díaz, Félix A. López, Olga RodríguezAbstract:AbstractA laboratory-/bench-scale investigation relating to copper recovery from Chilean copper Flue Dust is described. Since the Dust contained a high amount of copper (nearly 24%), the considered option consisted in the leaching of the metallic material with ammonium chloride solution, thus enabling the dissolution of copper via its ammoniacal complexes, and also rendering, due to the almost neutral conditions of the leaching solution, a near complete lean solution with respect to the presence of other metal accompanying in the Dust. Results obtained show that with ammonium chloride solutions, nearly 90% of the copper contained in the Dust can be leached at 20°C. Copper enters the solvent extraction-electrowinning circuit due to the following equilibria:regenerating both the leaching and the solvent extraction reagents. In the above equation, HR represented the active substance of the extractant (Acorga PT5050) used in the solvent extraction circuit; the first of the above equilibria is related to the e...
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Recycling of an electric arc furnace Flue Dust to obtain high grade ZnO
Journal of hazardous materials, 2006Co-Authors: Oscar Ruiz, Carmen Clemente, Manuel Alonso, Francisco José AlguacilAbstract:The production of steel in electric arc furnace (EAF) generates a by-product called EAF Dusts. These steelmaking Flue Dusts are classified in most inDustrialized countries as hazardous residues because the heavy metals contained in them, tend to leach under slightly acidic rainfall conditions. However, and at the same time they contain zinc species which can be used as a source to obtain valuable by-products. The present investigation shows results on the processing of an EAF Flue Dust using ammonium carbonate solutions. Once zinc is dissolved: ZnO + 4NH3 + H2O --> Zn(NH3)4(2+) + 2OH- with other impurities (i.e. cadmium and copper), these are eliminated from the zinc solution via cementation with metallic zinc. The purified zinc solution was evaporated (distilled) until precipitation of a zinc carbonate species, which then was calcined to yield a zinc oxide of a high grade. For the unattacked Dust residue from the leaching operation, mainly composed of zinc ferrite, several options can be considered: back-recycling to the furnace, further treatment by sodium hydroxide processing or a more safely dumping due to its relatively inertness.
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Considerations about the recycling of EAF Flue Dusts as source for the recovery of valuable metals by hydrometallurgical processes
Resources Conservation and Recycling, 1994Co-Authors: C. Caravaca, A. Cobo, Francisco José AlguacilAbstract:Abstract The present work takes an EAF Flue Dust to research its possibilities as resource from which to recover valuable base metals, principally zinc, by means of hydrometallurgical processes. At the same time this approach renders a recycle of the Flue Dust and thus decreases its environmental impact. The EAF Flue Dust is leached by different leaching reagents: acid, basic and complexing, and from the different pregnant solutions several approaches were proposed to obtain the most valuable metals contained in it. These approaches included the application of solvent extraction and other hydrometallurgical techniques.
H. M. Kuss - One of the best experts on this subject based on the ideXlab platform.
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Slurry sampling electrothermal vaporization inductively coupled plasma mass spectrometry for steelmaking Flue Dust analysis
Spectrochimica Acta Part B: Atomic Spectroscopy, 2000Co-Authors: Aurora Gómez Coedo, Teresa Dorado, Isabel Padilla, R. Maibusch, H. M. KussAbstract:Abstract A commercial atomic absorption graphite furnace (AAGF), with a self-made adapter and valve system, was used as a slurry sampling cell for electrothermal vaporization inductively coupled plasma mass spectrometry (ETV-ICP-MS). The system was applied to the determination of As, Sn, Sb, Se, Te, Bi, Cd, V, Ti and Mo in steelmaking Flue Dusts. Experimental conditions with respect to ETV and ICP-MS operating parameters were optimized. Compared to aqueous solutions, slurry samples were found to present better analyte transport. Microgram amounts of Rh were used to reduce the difference in analyte response in sensitivity for aqueous solutions of the tested analytes. No such increasing effect was observed for slurry samples and aqueous standards. An added quantity of Rh acting as modifier/carrier resulted in an increase for the same analytes in matrix-slurry solutions, even the addition of an extra Rh quantity has resulted in a decrease in the signals. The effect of Triton X-100 (used as a dispersant agent) on analyte intensity and precision was also studied. External calibration from aqueous standards spiked with 100 μg ml −1 Rh was performed to quantified 0.010 g/100 ml slurry samples. Results are presented for a certified reference electrical arc furnace Flue Dust (EAF): CRM-876-1 (Bureau of Analysis Samples Ltd., Cleveland, UK), a reference sample of coke ashes X-3705 (from AG der Dillinger Huttenwerke, Germany), and a representative sample of EAF Flue Dust from a Spanish steelmaking company (CENIM-1). For the two reference materials an acceptable agreement with certificate values was achieved, and the results for the CENIM sample matched with those obtained from conventional nebulization solution.
M.e.h. Shalabi - One of the best experts on this subject based on the ideXlab platform.
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A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process
Powder Technology, 2011Co-Authors: N.a. El-hussiny, M.e.h. ShalabiAbstract:Abstract This study aims to investigate the possible solution for blast furnace Flue Dust which generates from the Egyptian Iron and Steel Company by forming self-reducing briquettes composed of Flue Dust and mill scale with different mass ratios, used in electric arc furnace to produce steel. The results indicated that the mechanical properties of the briquettes improved with increasing mill scale ratio in the mixture, whereas the reduction percentages decreased with decreasing temperatures. The addition of coke breeze fines to the briquette mixture (1 mill scale : 1 Flue Dust) improved the compressive strength of the produced briquette. XRD analysis and microscopic structure of briquette containing 11% coke reduced at 1100 °C for 2 h in isolated atmosphere, showed that the iron phase was predominate phase and the quantity of metallic iron increased.
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Effect of Recycling Blast Furnace Flue Dust as Pellets on the Sintering Performance
Science of Sintering, 2010Co-Authors: N.a. El-hussiny, M.e.h. ShalabiAbstract:The Egyptian Iron and Steel Company generates a great amount of blast furnace Flue Dust. The recovery of metals and carbon from this Flue Dust becomes a very important demand due to the increase of the price of coke breeze and the decrease of the primary source of metals. At the same time, it make the environment more safe by decreasing pollution. Introducing these Dust fines in the sintering process proves to be very harmful for different operating parameters. Thus, this study aims at investigating the production of pellets resulting from these fines, using molasses as organic binder and its application in sintering of iron ore. The sintering experiments were performed using Flue Dust as pellets as a substitute of coke breeze. The results revealed that, sintering properties such as inter strength increases with using the Flue Dust pellets, while productivity of both the sinter machine and sinter machine at blast furnace yard decreases. Also the vertical velocity of the sinter machine and the weight loss during the reduction of produced the sinter by hydrogen decrease.
Petr Drahota - One of the best experts on this subject based on the ideXlab platform.
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transformation of arsenic rich copper smelter Flue Dust in contrasting soils a 2 year field experiment
Environmental Pollution, 2018Co-Authors: Alice Jarosikova, Vojtěch Ettler, Martin Mihaljevic, Adam Culka, Vit Penižek, Tomas Matousek, Petr DrahotaAbstract:Abstract Dust emissions from copper smelters processing arsenic-bearing ores represent a risk to soil environments due to the high levels of As and other inorganic contaminants. Using an in situ experiment in four different forest and grassland soils (pH 3.2–8.0) we studied the transformation of As-rich (>50 wt% As) copper smelter Dust over 24 months. Double polyamide bags with 1 g of Flue Dust were buried at different depths in soil pits and in 6-month intervals; then those bags, surrounding soil columns, and soil pore waters were collected and analysed. Dust dissolution was relatively fast during the first 6 months (5-34%), and mass losses attained 52% after 24 months. The key driving forces affecting Dust dissolution were not only pH, but also the water percolation/retention in individual soils. Primary arsenolite (As2O3) dissolution was responsible for high As release from the Dust (to 72%) and substantial increase of As in the soil (to a 56 × increase; to 1500 mg kg−1). Despite high arsenolite solubility, this phase persisted in the Dust after 2 years of exposure. Mineralogical investigation indicated that mimetite [Pb5(AsO4)3(Cl,OH)], unidentified complex Ca-Pb-Fe-Zn arsenates, and Fe oxyhydroxides partly controlled the mobility of As and other metal(loid)s. Compared to As, other less abundant contaminants (Bi, Cu, Pb, Sb, Zn) were released into the soil to a lesser extent (8-40% of total). The relatively high mobility of As in the soil can be seen from decreases of bulk As concentrations after spring snowmelt, high water-extractable fractions with up to ∼50% of As(III) in extracts, and high As concentrations in soil pore waters. Results indicate that efficient controls of emissions from copper smelters and Flue Dust disposal sites are needed to prevent extensive contamination of nearby soils by persistent As.
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characterization and ph dependent environmental stability of arsenic trioxide containing copper smelter Flue Dust
Journal of Environmental Management, 2018Co-Authors: Alice Jarosikova, Vojtěch Ettler, Martin Mihaljevic, Petr Drahota, Adam Culka, Martin RacekAbstract:Increasing amounts of impurities (especially As) in Cu ores have aggravated the problem of Flue Dust generation in recent years. As an example from a smelter processing As-rich Cu ores, we characterized a Flue Dust particularly rich in As (>50 wt%) to understand its mineralogy and pH-dependent leaching behavior, with special emphasis on binding, release and solubility controls of inorganic contaminants (As, Bi, Cd, Cu, Pb, Sb, Zn). Whereas arsenolite (As2O3) was the major host for As and Sb, other contaminants were bound in sulfides, arsenates, alloys and slag-like particles. The EU regulatory leaching test (EN 12457-2) indicated that leached As, Cd, Sb and Zn significantly exceeded the limit values for landfills accepting hazardous waste. The pH-dependent leaching test (CEN/TS 14997) revealed that As, Sb and Pb exhibited the greatest leaching at pH 11-12, whereas Cd, Cu and Zn were leached most under acidic condition (pH 3) and Bi leaching was pH-independent. Mineralogical investigation of leached residue coupled with geochemical modeling confirmed that newly formed Ca, Pb and Ca-Pb arsenates (mimetite, Pb5(AsO4)3Cl) partly control the release of As and other contaminants under circumneutral and alkaline conditions and will be of key importance for the fate of smelter-derived contamination in soils or when stabilization technology is employed.
Alice Jarosikova - One of the best experts on this subject based on the ideXlab platform.
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transformation of arsenic rich copper smelter Flue Dust in contrasting soils a 2 year field experiment
Environmental Pollution, 2018Co-Authors: Alice Jarosikova, Vojtěch Ettler, Martin Mihaljevic, Adam Culka, Vit Penižek, Tomas Matousek, Petr DrahotaAbstract:Abstract Dust emissions from copper smelters processing arsenic-bearing ores represent a risk to soil environments due to the high levels of As and other inorganic contaminants. Using an in situ experiment in four different forest and grassland soils (pH 3.2–8.0) we studied the transformation of As-rich (>50 wt% As) copper smelter Dust over 24 months. Double polyamide bags with 1 g of Flue Dust were buried at different depths in soil pits and in 6-month intervals; then those bags, surrounding soil columns, and soil pore waters were collected and analysed. Dust dissolution was relatively fast during the first 6 months (5-34%), and mass losses attained 52% after 24 months. The key driving forces affecting Dust dissolution were not only pH, but also the water percolation/retention in individual soils. Primary arsenolite (As2O3) dissolution was responsible for high As release from the Dust (to 72%) and substantial increase of As in the soil (to a 56 × increase; to 1500 mg kg−1). Despite high arsenolite solubility, this phase persisted in the Dust after 2 years of exposure. Mineralogical investigation indicated that mimetite [Pb5(AsO4)3(Cl,OH)], unidentified complex Ca-Pb-Fe-Zn arsenates, and Fe oxyhydroxides partly controlled the mobility of As and other metal(loid)s. Compared to As, other less abundant contaminants (Bi, Cu, Pb, Sb, Zn) were released into the soil to a lesser extent (8-40% of total). The relatively high mobility of As in the soil can be seen from decreases of bulk As concentrations after spring snowmelt, high water-extractable fractions with up to ∼50% of As(III) in extracts, and high As concentrations in soil pore waters. Results indicate that efficient controls of emissions from copper smelters and Flue Dust disposal sites are needed to prevent extensive contamination of nearby soils by persistent As.
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characterization and ph dependent environmental stability of arsenic trioxide containing copper smelter Flue Dust
Journal of Environmental Management, 2018Co-Authors: Alice Jarosikova, Vojtěch Ettler, Martin Mihaljevic, Petr Drahota, Adam Culka, Martin RacekAbstract:Increasing amounts of impurities (especially As) in Cu ores have aggravated the problem of Flue Dust generation in recent years. As an example from a smelter processing As-rich Cu ores, we characterized a Flue Dust particularly rich in As (>50 wt%) to understand its mineralogy and pH-dependent leaching behavior, with special emphasis on binding, release and solubility controls of inorganic contaminants (As, Bi, Cd, Cu, Pb, Sb, Zn). Whereas arsenolite (As2O3) was the major host for As and Sb, other contaminants were bound in sulfides, arsenates, alloys and slag-like particles. The EU regulatory leaching test (EN 12457-2) indicated that leached As, Cd, Sb and Zn significantly exceeded the limit values for landfills accepting hazardous waste. The pH-dependent leaching test (CEN/TS 14997) revealed that As, Sb and Pb exhibited the greatest leaching at pH 11-12, whereas Cd, Cu and Zn were leached most under acidic condition (pH 3) and Bi leaching was pH-independent. Mineralogical investigation of leached residue coupled with geochemical modeling confirmed that newly formed Ca, Pb and Ca-Pb arsenates (mimetite, Pb5(AsO4)3Cl) partly control the release of As and other contaminants under circumneutral and alkaline conditions and will be of key importance for the fate of smelter-derived contamination in soils or when stabilization technology is employed.