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Tungsten residue waste (TRW) has been recognized as a hazardous solid waste by Chinese government due to its high As content and leaching toxicity. This paper presents a green full process for efficient arsenic removal and tungsten recovery from hazardous TRW, focusing on the separation and recovery of arsenic and tungsten from leach solution of TRW via solvent …
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A commercial anionic resin has been tested to evaluate its suitability for tungsten recovery from aqueous solutions. Equilibrium runs at fixed temperature have been carried out at different pH levels, showing a higher exchange capacity at acid pH. Kinetics studies consist of the analysis of the breakthrough curves at different tungsten concentrations, flow rates, pHs, and …
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In this paper, a feasible and novel strategy for deep arsenic removal and efficient tungsten recovery from TRW was proposed based on the concept of weathering process …
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ciency of tungsten recovery was only 18%. X. Xiao et al. [7] separated tungsten from spent carbide in a NaF-KF molten salt and proposed the concept of short process recovery of tungsten. However, the process required considerable energy consumption, and the electrochemical recovery of spent carbide was not described. To reduce energy ...
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Fully understanding the environmental fate of tungsten is an ongoing challenge from an analytical perspective, due to the lack of effective laboratory methods for quantifying tungsten in soil. Developing the methods necessary to accurately and ... Coupling of oxygen and pH requirements for effective microwave-assisted digestion of soils for ...
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Detection limits for tungsten are 50 µg of soluble tungsten per sample and 125 µg of insoluble tungsten per sample using an absorption line at 255.1 nm (NIOSH 1994). Inductively coupled plasma techniques have been used to measure tungsten concentrations in water samples. Samples are typically filtered and acidified before analysis.
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Tungsten is a scarce and valuable metal with a wide range of applications. Currently, the recovery of tungsten from scheelite concentrates involves the use of strong acids, alkalis, and/or high temperatures (roasting). Deep Eutectic Solvents (DES) are proposed as an environmentally friendly alternative for the leaching process aiming to extract the tungsten …
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Recovery of Tungsten, Niobium and Tantalum occurring as by-products in mining and processing waste streams ... Inventory and feasibility analysis Leader IDE INE, TEC, CRH Task 7.3 (M25 – M34) Process Design Leader: IDE INE, TEC, CRH Task 7.4 (M32 – M40) Detailed engineering Leader: INE IDE, TEC
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Characterization and beneficiation options for tungsten recovery from Yxsjöberg historical ore tailings. Processes, 7 (2019), p. 895, 10.3390/PR7120895. View in Scopus Google Scholar. ... Import and export analysis of tungsten products in China in the first half of 2017. China Tungsten Ind., 32 (2017), pp. 1-7. View in Scopus Google Scholar.
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Tungsten (W) is a critical raw material and mainly used in the production of cemented carbides, mill products, alloys and steels [9].China owns 83 % of the world's tungsten mine production [33].Ammonium paratungstate (APT) is an important intermediate product at the front end of the tungsten industry chain, and a large amount of hazardous tungsten residue …
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In this work, a more sustainable conceptual flowsheet for the recovery of tungsten from high-grade (55.0 wt % W) and medium-grade (3.3 wt % W) scheelite ores was developed at the lab scale. ... The 55-W and 3-W solids were characterized via analysis with ICP-OES (Optima 8300, PerkinElmer), after prior digestion using a microwave digester (Mars ...
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Tungsten alloys are the subject of many recycling studies due to the scarcity of the tungsten sources and environmental considerations to reuse metal scraps. In the current investigation, direct recovery of tungsten from W-10.5 wt.% powder metallurgy parts were performed by FeCl3 selective digestion of copper binder. The experiments were performed at …
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The scarcity of high grade tungsten ores obliges users to seek to recover it from scrap materials, but drill bits in particular pose especial problems. Existing proposals to use acidic hydrogen peroxide to oxides and solubilize tungsten is extremely inefficient in reagent consumption per unit tungsten recovered. According to the present invention, hydrogen peroxide can be used …
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Download Citation | Simulation analysis on optimization of tungsten carbide recovery efficiency by molten salt electrolysis | The molten salt electrochemical method is an efficient one-step ...
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The tungsten recovery results for the unheated cell suspension and the cell suspension heated at 90 ... SI-1(c) shows the TEM-EDX mapping analysis result of the tungsten adsorbed E. coli cells. This sample exhibited tungsten signals along with signals from C and O from cells. The peaks of C and O likely arose from proteins and enzymes present ...
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In this work, a more sustainable conceptual flowsheet for the recovery of tungsten from high-grade (55.0 wt % W) and medium-grade (3.3 wt % W) scheelite ores was developed at the lab scale.
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An Attempt to Assess Recovery/Recrystallization Kinetics in Tungsten at High Temperature Using Statistical Nanoindentation Analysis Liz Karanja, Matthieu Lenci, David Piot, Claire Maurice, Alan Durif, ... annealing; hardness; tungsten; statistical analysis 1. Introduction Thermonuclear fusion is a one non-carbon emitting promising source of ...
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A green process for arsenic removal and tungsten recovery from tungsten residue waste: Focused on the separation and recovery of arsenic and tungsten via solvent extraction followed by H2S ...
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Company profile for Xiamen Tungsten Co.,Ltd. (SHA: 600549) with a description, list of executives, contact details and other key facts. ... downstream processing, and secondary resource recovery of tungsten, molybdenum, and rare earth metals in China. It operates through Non-Ferrous Metal Products Such as Tungsten and Molybdenum; Rare Earth ...
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In this study, Deep Eutectic Solvents (DES) were proposed as an environmentally friendly leaching alternative for the extraction of the tungsten from the concentrate material. Tungsten can be later recovered from the DES …
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Furthermore, the analysis of cathode prod-ucts demonstrated that a tungsten powder of approximately 500 nm could be selectivelyrecovered from WC-Co hard metal scrap with the electrolysis condition ...
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Tungsten alloys are the subject of many recycling studies due to the scarcity of the tungsten sources and environmental considerations to reuse metal scraps. In the current investigation, direct recovery of tungsten from W-10.5 wt.% powder metallurgy parts were performed by FeCl 3 selective digestion of copper binder. The experiments were performed at different salt …
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Waste fluidized catalytic cracking (FCC) catalysts contain strategic metals with high recycling value, and effective treatment of these waste catalysts is crucial for resource recovery and environmental protection. In this study, a leaching process of "oxidation treatment–alkali …
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Tungsten recovery from low-grade concentrates by amine solvent extraction (U.S. Dept. of the Interior, Bureau of Mines, 1966), ... Donald W. Bridges, and United States Bureau of Mines (page images at HathiTrust) Bureau of Mines research on the analysis of high-purity tungsten (U.S. Dept. of the Interior, Bureau of Mines, 1968), ...
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A method for recovering tungsten from a tungsten containing spent catalyst comprises digesting the catalyst in aqueous sodium hydroxide solution wherein the mole ratio of the sodium hydroxide to the tungsten contained in the spent catalyst is from about 2.6 to about 4.2 and wherein the amount of water is sufficient to dissolve the subsequently produced sodium tungstate, at a …
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The results show that under the conditions that the ratio of water to ore is 0.8, stirring rate is 500 r min−1 and the heating time is 2.0 h at 160 C, the recovery of tungsten reaches 98% for ...
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This study focuses on the acidic solution of WO 3, employing D318 macroporous resin for the adsorption and recovery of tungsten. The adsorption process is investigated through kinetic …
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In the current investigation, direct recovery of tungsten from W-10.5 wt.% powder metallurgy parts were performed by FeCl3 selective digestion of copper binder. The …
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Repositories of historical tungsten mining tailings pose environmental risks, but are also potential resources for valuable metals. They still contain large tonnages of useful minerals and metals, reflecting the inefficient extraction methods and/or low metal prices at the time they were mined. The focus of this study is to evaluate the technical viability of reprocessing the …
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A principal technological scheme is proposed for tungsten recovery from the wastes of heavy tungsten alloys to form ammonium paratungstate as the final product. ... such as FTIR spectrometry, 1 H ...
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