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Tungsten recovery chemicals

  • US4629606A - Recovery of tungsten compounds - Google Patents

    US4629606A US06/755,402 US75540285A US4629606A US 4629606 A US4629606 A US 4629606A US 75540285 A US75540285 A US 75540285A US 4629606 A US4629606 A US 4629606A Authority US United States Prior art keywords water waste liquor tungsten compound temperature furnace Prior art date 1984-07-18 Legal status (The legal status is an assumption and is not a legal conclusion.

  • Tungsten processing Britannica

    Chemical compounds Tungsten carbide (WC) Tungsten carbides are divided into two categories. The first is the cemented tungsten carbides, also called hard metals, which are essentially WC produced from sintering a mixture of carbon black and hydrogen-reduced tungsten powder at 1,500° C (2,700° F). These are cemented using a cobalt or nickel

  • Tungsten Extraction Process

    Jul 12, 2018· Tungsten Gravity Recovery and Regrind Circuits. The Selective Type Mineral Jig is the first machine in the gravity concentration circuit and handles the unclassified Screen undersize. As indicated in the accompanying table, the Mineral Jig shows highly efficient concentration in all sizes of a feed which is minus 10 mesh. Although the Mineral

  • US5932184A - Method for recovery of tungsten from spent

    One method of recovery involves the use of a soda ash digestion followed by considerable processing to a calcium tungstate end product. This method requires the use of acid to drive off the

  • Tungsten recovery from alkaline leach solutions as

    of calcium tungstate on tungsten recovery using a cal-cium ion-selective electrode. This potentiometric tech-nique has the advantage of being non-destructive and measures high to low concentrations directly. 2. Experimental 2.1. Reagents and solutions All chemicals were analytical grade from Merck and used without further purification.

  • Tungsten Poisoning. Symptoms of tungsten poisoning Patient

    Feb 22, 2021· Tungsten, chemical symbol W (for Wolframite, its mineral form's German name) - atomic number 74 - is a widely used metal that has a very high tensile strength and melting point. It is used in its elemental form in military guns and projectiles, wear-resistant machinery/products, lightbulb filaments and electron and television tubes.

  • Technical Fact Sheet Tungsten

    Tungsten in the form of finely divided powder is highly flammable and may ignite spontaneously on contact with air. Powdered tungsten may also cause fire or explosion on contact with oxidants (HSDB 2009; NIOSH 2016). Exhibit 1: Physical and Chemical Properties of Elemental Tungsten (ATSDR 2005; NIEHS 2003; NIOSH 2016) Property Value

  • (PDF) An overview on different processes for recovery of

    A combined electrochemical and chemical process was developed for the recovery of tungsten and cobalt from hard alloys of VK grades with the preparation of tungstic acid and cobalt oxalate as

  • Process_for_recovering_molybdenum_and_tungsten_from

    During this process, the influence of leaching time on molybdenum and tungsten recovery was studied. It was found that 1 hr was sufficient to achieve 9798% Mo and W recovery from the cake (Table 1). The dissolved amounts of molybdenum and tungsten were 50 60 g/L and 2535 g/L respectively.

  • Recovery and recrystallization kinetics of differently

    Recovery and recrystallization kinetics of differently rolled, thin tungsten plates in the temperature range from 1325 °C to 1400 °C Umberto M. Ciucani , Angela Thum, Chloé Devos, Wolfgang Pantleon

  • Industrialization of Tungsten Recovering from Used

    34 · Industrialization of Tungsten Recovering from Used Cemented Carbide Tools 3. Features of Newly Developed Tungsten Recycling Technology Carbide tool recycling methods are roughly classi-fied into two types: direct and indirect. The direct method processes hard scrap into powder with the chemical composition intact. The indirect method

  • Recovery and Recycling of Tungsten by Alkaline Leaching of

    When lysine hydrochloride, which contains a charged amino group (NH 3+), was added to an alkaline leaching solution containing tungsten (307 mmol L 1), sodium (1236 mmol L 1), and vanadium (1.7 mmol L 1), over 90% of the tungsten was rapidly recovered as a lysinetungsten precipitate.

  • Selective Biosorption and Recovery of Tungsten from an

    With an aim of direct reuse or chemical recovery of tungsten, the reclamation of WC is commonly divided into three parts: (1) pyrometallurgy, (2) hydrometallurgy, and (3) a combined (pyro + hydro

  • NIOSHTIC-2 Publications Search - 10005375 - Recovery of

    Although many brine chemicals are extracted from the lake, tungsten recovery was an elusive goal prior to Bureau of Mines development of an ion-exchange technique.

  • Tungsten Ore Extraction Processing Wolframite

    Tungsten concentrates are sent to smelters to refine the metals tungsten, tungsten carbide, tungsten alloys and tungsten compounds, while tungsten middlings is chemically treated to produce synthetic scheelite, ammonium paratungstate, tungsten powder and tungsten carbide.

  • Reclamation of tungsten from carbide scraps and spent

    This paper reviews the state-of-the-art recycling of tungsten from carbide (WC) scraps and other spent alloys generated by various production and application industries. With an aim of direct reuse or chemical recovery of tungsten, the reclamation of WC is commonly divided into three parts: (1) pyrometallurgy, (2) hydrometallurgy, and (3) a combined (pyro + hydro) metallurgical process.

  • Tungsten Archives - International Mining

    A calculation has shown that a 90% recovery of tungsten can be possible at a waste removal of more than 50%. The low-grade sample 41 could be upgraded by a factor of 1.7 to 3. For further calculations, a waste grade between 0.025 and 0.030 is achievable.

  • Recovery of Cobalt Powder and Tungsten Carbide from

    Table 1: Chemical composition of the cemented tungsten carbide scrap powder used in the experiments. Wt % <90 μm Wt % >90 μm W 75.86 Co 8.59 Co 8.14 Fe 2.90 C 6.07 Ni 0.06 Ti 4.18 Nb 1.35 Ni 1.00 Fe 3.40 X-ray analysis and SEM micrograph of the raw material are given in Fig. 1a und b

  • Tungsten Chemicals and their Applications

    However, tungsten chemicals are used today in the form of tungsten oxides, tungstates, tungstic acid, silicotungstic acid, phosphotungstic acid or tungsten sulfides across a broad range of applications in the oil, lubricants, electronics, medical, dental and mining industries. Maiden Blush: A Very Early Use of Tungsten that Wasnt

  • Metals and Health: A Clinical Toxicological Perspective on

    Physical and Chemical Characteristics. Tungsten (chemical symbol W, atomic number 74, atomic weight 183.85) is a greyish-white lustrous metal which is solid at room temperature. 1, 2 6 cm/°C). Occurrence. Tungsten is a naturally occurring element in rocks and minerals combined with other chemicals but never as a pure metal. 1, 3

  • A new self-healing epoxy with tungsten (VI) chloride

    Tungsten Chemical Compounds. Chlorides Chemical Compounds. Ring opening polymerization Chemical Compounds. Catalysts Chemical Compounds. Both as-received and recrystallized forms of the WCl6 resulted in nearly complete fracture recovery in self-activated tests, where healing agent is manually injected into the crack plane, at 12wt% WCl6

  • Harmless Treatment and Valuable Metals Recovery of

    Tungsten leaching residues are industrial wastes that are largely generated during commercial tungsten production. The residues have been classified as hazardous solid wastes due to the presence of toxic elements. On the other hand, the residues contain valuable elements, such as W, Mn, and Fe which can be recovered for economic benefit. To utilize the residue, a carbothermic reduction process

  • Liquid-liquid extraction process for the recovery of

    A recyclable process for the recovery of tungsten from low level aqueous sources comprises adjustment of the pH of the source solution to a value below about pH 6, extraction of the tungsten values into an organic phase comprising a chelating agent, an organic transfer agent, and an inert organic solvent. Preferred chelating agents include vicinally disubstituted aromatic compounds in which

  • R.K. JENA

    recover tungsten from CTC may be classified into two broad-based groups. First involves the conversion of total tungsten into its salt'-' and second aims at recovery of tungsten carbide as such, which can be recycled for fabricating new tools'9-111. Fusion with sodium nitrate to

  • Tungsten Investing News You Can Trust INN

    About two-thirds of tungsten is used to make cemented carbide, while mill products and chemicals account for the rest. While tungsten has many key uses, prices have been in the doldrums for the

  • Recovery and Recycling of Tungsten by Alkaline Leaching of

    When lysine hydrochloride, which contains a charged amino group (NH 3+), was added to an alkaline leaching solution containing tungsten (307 mmol L 1), sodium (1236 mmol L 1), and vanadium (1.7 mmol L 1), over 90% of the tungsten was rapidly recovered as a lysinetungsten precipitate.

  • Recovery of tungsten carbide from scrap mining bits

    @article{osti_5543816, title = {Recovery of tungsten carbide from scrap mining bits}, author = {Piche, F J}, abstractNote = {Tungsten carbide inserts are recovered from scrap mining bits by treatment in a sulphuric acid bath to eat away part of the steel surrounding the inserts and then heating the bit and vibrating the heated bit to knock out the inserts.

  • RECOVERY OF TUNGSTEN FROM LOW-GRADE SCHEELITE

    very efficient, due to mineralization of tungsten in a fine dissiminated form, low-grade concentrates with tungsten content from 5-20% WO3 are still in production. It is necessary to treat additionally such concentrates to increase tungsten recovery [1-3]. Depending on chemical

  • Recovery of tungsten and cobalt from tungsten carbide tool

    An environmentally friendly process is required to recover rare metals (Co and W) from the wastes. The effect of mechano-chemical (MC) treatment on leaching of rare metals was investigated in this study. The solvent extraction and crystallization-stripping methods were applied to separate and recover tungsten and cobalt in the leached solutions.

  • US4629606A - Recovery of tungsten compounds - Google Patents

    US4629606A US06/755,402 US75540285A US4629606A US 4629606 A US4629606 A US 4629606A US 75540285 A US75540285 A US 75540285A US 4629606 A US4629606 A US 4629606A Authority US United States Prior art keywords water waste liquor tungsten compound temperature furnace Prior art date 1984-07-18 Legal status (The legal status is an assumption and is not a legal conclusion.

  • Tungsten extractive metallurgy: A review of processes and

    Oct 01, 2019· A typical method is the selective acid leaching: The tungsten scrap is first leached in a mineral or organic acid to dissolve the binder metal, then leaching the remainder in another solution to recovery tungsten and other metals (Chio et al., 2018, Edtmaier et al., 2005, Song et al., 2018, Zhang et al., 2018). The resulting powder is closely

  • Why Gravity Separation Equipment Works So Well For Tungsten

    Tungsten is often broken down very finely in grinding circuits, making efficient recovery difficult. These fine tungsten particles are typically rejected from mineral processing plants as slimes. Falcon Gravity Concentrators can be used to recover these fine particles to increase recovery rates.

  • Tungsten Direct Recovery from W-Cu Alloy Scrap by

    process for tungsten recovery: 1. Time of recovery process was varied from 4h up to 48h for FeCl 3 /tungsten alloy scrap (denoted as W) weight ratio of 1/1 and 2/1. 2. Experiments were operated at various FeCl 3 /W weight ratios from 1/2 up to 10/1. 3. The pH of the recovery

  • Tungsten Processing International Tungsten Industry

    Recycling of tungsten in high speed steel is high, and a typical melt contains 60% to 70% scrap, including internally generated scrap. On the other hand, recycling in such applications as lamp filaments (average coil weight: <30 mg; absolutely not economic to recycle), welding electrodes and chemical uses is

  • Tungsten Poisoning - Chelation Community

    Jun 24, 2018· Tungsten (chemical symbol W and atomic number 74) is a widely used metal that has a very high tensile strength and melting point. It is used in its elemental form in military guns and projectiles, wear-resistant machinery/products, light bulb filaments, electrodes and televisions.

  • Minerals Free Full-Text Tungsten Recovery from Spent

    The recovery of tungsten (W) from a honeycomb-type spent selective catalytic reduction (SCR) catalyst using an alkaline leachingion exchange method was investigated. Spent SCR catalyst mainly consists of TiO2 and other oxides (6.37% W, 1.57% vanadium (V), and 2.81% silicon (Si), etc.). The ground catalyst was leached at the optimal conditions, as follows: NaOH concentration of 0.3 kg/kg of

  • An overview on different processes for recovery of

    the processing of tungsten concentrates or scrap to make tungsten metal powder, tungsten containing chemical generated during the fabrication of tungsten products, carbide material from tungsten containing material (Shedd, 2000). (a) Cutting tool bits. (b) Ammunition and other scraps. Fig. 3: Various types of WC scraps.

  • A novel process for recovery of tungsten and vanadium from

    Jul 01, 2003· The process to recover tungsten and vanadium involves three steps: purification and separation of vanadium from tungsten, recovery of vanadium, recovery of tungsten. For the recovery of vanadium, MgCl 2 and ammonia solution are used in the purification step

  • Tungsten Recovery from Spent SCR Catalyst Using Alkaline

    Tungsten Recovery from Spent SCR Catalyst Using Alkaline Leaching and Ion Exchange Wen-Cheng Wu, Tang-Yi Tsai and Yun-Hwei Shen * very similar chemical properties and are produced commercially by relatively similar procedures [20]. Therefore, it is difficult to separate V from W.

  • Sampling and Analytical Methods Tungsten and Cobalt in

    Other common components of cemented tungsten carbide materials include intermetallic compounds of W and Co (e.g., Co 6 W 6 C) in addition to other metals and their carbides.


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