• Hydrometallurgical processing of spent selective catalytic ...

    Dec 30, 1997· Integrated process for the recovery of metals and fused alumina from spent catalysts . United States Patent 5702500 . Abstract: An integrated process for the treatment of spent catalysts containing mainly molybdenum, vanadium, nickel, cobalt and, alumina to produce ammonium metavanadate, vanadium pentoxide, molybdic trioxide, fused alumina and ...

  • Accounts Receivable Invoice Automation | Tungsten Network

    An overview on different processes for recovery of valuable metals from tungsten carbide scrap. ... In order to develop a recovery process of ruthenium and cobalt, separation experiments were ...

  • Recovery of Cobalt Powder and Tungsten Carbide from ...

    This publication describes the Bureau process, the Searles Lake Resource, general problems associated with tungsten recovery, Bureau research objectives, the synthesis of ion-exchange resins, the development of a two-stage ion-exchange tungsten extraction and concentration procedure, product recovery and purification, and provides an economic ...

  • Integrated process for the recovery of metals and fused ...

    Recovery of Cobalt Powder and Tungsten Carbide from Cemented Carbide Scrap - Part I: Kinetics of Cobalt Acid Leaching Sebahattin Gürmen1; Bernd Friedrich2 1Istanbul Technical University, Metallurgical & Materials Eng. Dept., Istanbul, Türkei 2IME Process Metallurgy and Metal Recycling, RWTH Aachen University, Germany ABSTRACT

  • Process for the recovery of tungsten in a pure form from ...

    US2756139A US264462A US26446252A US2756139A US 2756139 A US2756139 A US 2756139A US 264462 A US264462 A US 264462A US 26446252 A US26446252 A US 26446252A US 2756139 A US2756139 A US 2756139A Authority US United States Prior art keywords tin ore tungsten residue kiln Prior art date 1952-01-02 Legal status (The legal status is an assumption and is not a legal conclusion.

  • Tungsten Metallurgy - Mineral Processing & Metallurgy

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  • US2756139A - Tin recovery from tin-tungsten ore - Google ...

    Apr 01, 2014· tungsten or just tungsten. In the first case (including the presence of molybdenum), the recycling process is completed by a further step involving the removal of phosphorus and arsenic. Recovery of both molybdenum and tungsten from spent catalysts involves a combination of pyrometallurgical and hydrometallurgical processes (see Figure 3).

  • Tungsten Direct Recovery from W-Cu Alloy Scrap by ...

    Mar 26, 2008· The complex nature of occurrence of both tungsten and tin minerals necessitated an integrated process comprising physical beneficiation and chemical extraction. The process route that was developed gave a tungsten and tin recovery of about 80 and 90%, respectively, on treating a primary gravity preconcentrate analyzing 16.5% WO 3 and 25.7% Sn.

  • A novel process for recovery of tungsten and vanadium from ...

    A flowsheet for a three stage process has been developed in this investigation to recovery both tungsten and vanadium from a leach solution of tungsten alloy scrap. The three steps are: initial purification and separation vanadium from the Na 2 WO 4 solution, vanadium recovery and tungsten recovery. The most important aspect is the development ...

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    Metallurgical ContentTungsten ore Beneficiation FLOWSHEETCrushing Tungsten RockTungsten Gravity Recovery and Regrind CircuitsCanadian Tungsten Beneficiation PracticeTungsten Extraction Process SummarizedTungsten-Gold from WolframiteTungsten from Scheelite The Beneficiation flowsheet shown with this study is particularly adapted to the concentration of tungsten ore in small tonnages. Tungsten ...

  • Processing of Tungsten Preconcentrate from Low Grade Ore ...

    Sep 01, 2006· Tungsten is one of the most important refractory metals. It is used in the production of numerous end-use items such as incandescent lamps and hard materials. From its ore concentrates and oxidized scrap, tungsten is processed via a hydrometallurgical route. In the last 100 years there has been a significant change in its processing. This paper reviews the methods employed in the ...

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

    Aug 12, 2010· In the alkali pressure leaching process, tungsten recovery was 94% at 463K for 20bar pressure, 100g/L sodium hydroxide and 60 minutes time. The leaching kinetics followed diffusion control model with lixiviant reacting the mineral phase through the porous product layer. ... AN INTEGRATED PROCESS FOR THE RECOVERY OF TUNGSTEN AND TIN FROM A ...

  • NIOSHTIC-2 Publications Search - 10005375 - Recovery of ...

    Nearly all alloy steels containing tungsten are made in the electric furnace where tungsten is introduced to the steel’s metallurgy in the form of ferro-tungsten. Ferro-tungsten, melts between 3500 and 3700 degrees F., while tungsten powder melts between 6000 and 6200 degrees F.

  • AN INTEGRATED PROCESS FOR THE RECOVERY OF TUNGSTEN …

    An integrated process for the recovery of tungsten and tin from a combined wolframite-scheelite-cassiterite concentrate

  • GB2093003A - A process for the removal of arsenic ...

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  • Recovering tungsten from spent hydrocracking catalysts

    This paper deals with the recovery of tungsten as synthetic CaWO 4 from spent V 2 O 5-WO 3 /TiO 2 (selective catalytic reduction, SCR) catalyst. The newly developed process included the systematic experimental steps (roasting, decomposition (using HCl solution), leaching (using NaOH), and precipitation) to recover tungsten as CaWO 4.The results revealed that the effect of roasting of spent …

  • An integrated process for the recovery of tungsten and tin ...

    GB2093003A - A process for the removal of arsenic compounds from tungsten or molybdenum concentrates - Google Patents A process for the removal of arsenic compounds from tungsten or molybdenum concentrates Download PDF Info Publication number GB2093003A. GB2093003A ...

  • Tungsten Extraction Process

    Abstract. A process is described for the recovery of tungsten from tungsten-containing materials which comprises the steps of (i) admixing the tungsten-containing material with a melt at a temperature of between 680/sup 0/C and 750/sup 0/C.

  • Modern hydrometallurgical production methods for tungsten ...

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    digestion 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 process adjusted to 0.5, 1, 1.5