Simulation analysis on optimization of tungsten …
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 ...
A green process for arsenic removal and tungsten recovery from tungsten
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 …
Recovery of Tungstate from Aqueous Solutions by Ion …
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 …
Recovery of Tungsten from Downstream Mineral Processing …
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 …
US4784687A
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 …
Browse subject: Tungsten -- Reactivity | The Online Books …
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), ...
Xiamen Tungsten Co.,Ltd. (SHA: 600549)
Xiamen Tungsten Co.,Ltd. engages in mining, smelting, 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 Business; Battery Material; and Real Estate and Supporting Management segments.
Solvometallurgical Process for the Recovery of …
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.
Recovery of Low-Concentration Tungsten from Acidic …
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 …
Review on Tungsten Recovery and Sustainable Practices
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 ...
Recovery of Low-Concentration Tungsten from Acidic …
To verify whether the D318 macroporous resin successfully captured low-concentration tungsten from acidic solutions, SEM-EDS analysis was conducted on the morphology and element distribution of the D318 resin powder surface before adsorption, after …
Dissolution of tungsten carbide and valence analysis of tungsten …
Simulation analysis on optimization of tungsten carbide recovery efficiency by molten salt electrolysis J. Appl. Electrochem., 51 ( 2021 ), pp. 861 - 870, 10.1007/s10800-021-01536-2 View in Scopus Google Scholar
Extraction and response surface methodology optimization …
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 …
Xiamen Tungsten Co.,Ltd. Company Description
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 ...
An Attempt to Assess Recovery/Recrystallization …
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 ...
Tungsten and arsenic substance flow analysis of a
The results showed that, the total tungsten resource efficiency of the system was 97.56%, and the tungsten recovery of unit process autoclaved alkali leaching, ion exchange, …
Extraction and response surface methodology optimization of tungsten …
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 roasting–wet mill leaching" was proposed for the extraction of tungsten (W) and molybdenum …
7. ANALYTICAL METHODS
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.
Synthesis, characterization, and physico-chemical aspects of …
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 ...
Worldwide reprocessing trials for tungsten recovery from …
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 ...
Tungsten Direct Recovery from W-Cu Alloy Scrap by …
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 …
Finding pearls in the mud: eco-friendly tungsten recovery …
Following bioleaching, they recovered tungsten from the solution using two purification processes: activated carbon-based adsorption-desorption and ammonium paratungstate (APT) precipitation. The economic analysis revealed that the activated carbon-based adsorption-desorption process was about 7 percent cheaper than the precipitation …
Finding Pearls in the Mud: Eco-Friendly Tungsten Recovery …
Following bioleaching, they recovered tungsten from the solution using two purification processes: activated carbon-based adsorption-desorption and ammonium paratungstate (APT) precipitation. The economic analysis revealed that the activated carbon-based adsorption-desorption process was about 7 percent cheaper than the precipitation …
(PDF) Recovery of tungsten from WC–Co hard metal
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 ...
A feasible strategy for deep arsenic removal and efficient …
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 …
Recovery of Low-Concentration Tungsten from Acidic …
Tungsten is a crucial strategic metal that plays a significant role in various fields, such as the defense industry, fine chemicals, and the preparation of new materials. During the practice of numerous tungsten smelting processes, a large amount of acidic wastewater containing low concentrations of …
(PDF) Enhanced Microwave Digestion for Soil Tungsten Analysis
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 ...
Heat-treated Escherichia coli as a high-capacity biosorbent …
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 ...
Solvometallurgical Process for the Recovery of Tungsten …
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 ...
Recovery of tungsten xide from waste diamond core drilling crowns
The use of LDI-MS as a new approach to identify the products after phases in the recycling process was an important part of the study, and the results were consistent with the XRD analysis. The total tungsten recovery was over 95.6%, with a high purity of the obtained tungsten xide.