US Patent for Process for the recovery of tungsten in a
The present invention relates to a simple process for the recovery of pure tungsten at a high yield from cemented tungsten carbide or tungsten alloys scrap. According to the invention the process consists of a series of steps characterized by certain critical parameters.The steps involved in the process are:(a) disintegration of the tungsten-containing material in a melt of sodium nitrate
US3271104A Process for the recovery of tungsten
US3271104A US256842A US25684263A US3271104A US 3271104 A US3271104 A US 3271104A US 256842 A US256842 A US 256842A US 25684263 A US25684263 A US 25684263A US 3271104 A US3271104 A US 3271104A Authority US United States Prior art keywords tungsten solution values hydrogen halide precipitated Prior art date 1963-02-07 Legal status (The legal status is an assumption
US3256058A Process for recovery of tungsten from
US3256058A Process for recovery of tungsten from scheelite and wolframite ores Google Patents
US4629503A Process for the recovery of tungsten in
According to a recent U.S. Pat. No. 4,256,708, an improvement is described for the process of tungsten recovery from cemented tungsten carbide. According to said improvement, titanium dioxide is...
US Patent for Recovery of tungsten, scandium, iron,
A process is disclosed for recovering tungsten, iron, and manganese from tungsten bearing material. The process involves digesting the material in a sufficient amount of sulfuric acid at a temperature of at least about 80.degree. C. for a sufficient time in the presence of coal as a reducing agent to form a digestion solution containing the major portion of the scandium, iron, and manganese
US Patent for Recovery of tungsten from heavy metal
BACKGROUND OF THE INVENTION. The present invention relates to the recovery of tungsten from heavy metal alloys. Heavy metal alloys are extensively used as shields or containers for radio active materials, as gyroscope rotors, counterweights, and corrosion resistant parts for jet air craft, and as armor penetrating projectiles and rocket nose cones.
US Patent for Liquid-liquid extraction process for the
DESCRIPTION OF THE PREFERRED EMBODIMENTS. According to the process of the present invention, tungsten is recovered from aqueous solutions by extraction in the form of a chelate complex into an inert organic solvent, followed by stripping of the tungsten from the organic system into an aqueous solution.
US Patent for Recovery of tungsten, scandium, iron,
A process is disclosed for recovering scandium from a tungsten bearing material containing tungsten, iron manganese and scandium. The process involves digesting the material in an aqueous solution selected from the group consisting of a saturated solution of sulfur dioxide and a sulfuric acid solution containing an additional reducing agent at a sufficient temperature for a sufficient time to
US5384016A Process for recovering tungsten
A process of recovering tungsten carbide from cemented tungsten carbide scraps by selective electrolysis is disclosed. A chelating agent is added to the electrolyte for complexing with tungsten ion...
US4279870A Liquid-liquid extraction process for the
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...
US 3,256,058 A Process for recovery of tungsten
Patent US3256058A Process for recovery of tungsten from scheelite and wolframite ores (US 3,256,058 A); Owner: Blair Burwell; Filed: 05/13/1965; Est. priority date: 05/13/1965; Status: Expired du...
US 3,158,438 A Solvent extraction process for
Patent US3158438A Solvent extraction process for recovering tungsten values from contaminated aqueous solutions (US 3,158,438 A); Owner: Charles R. Kurtak; Filed: 09/19/1962; Est. priority date:
Catalyst recovery process Patent Europe PMC
A process for recovering tungsten from a spent catalyst comprising a supported heteropolytungstic acid characterised in that the process comprises: (a) contacting the spent catalyst with an extractant selected from water, methanol, ethanol or a mixture of any two or more thereof for sufficient time to extract at least part of the heteropolytungstic acid therefrom; (b) separating the extractant
tungsten recovery from magnetite ore
tungsten ore recovery systems, Patent US. Gravity separation method is the main method of black tungsten ore dressing process The tungsten,recovery process In small tungsten ore,magnetic separation. More Price. TUNGSTEN. Scheelite ore at Darwin, United,minerals might lead to lower process recovery,also together with gold, fluorite or
Recovery of tungsten and cobalt from secondary raw
2010-11-6 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 intermediates. The subsequent reduction of these intermediates in
Selective recovery of tungsten from printed circuit
2015-12-1 Aqueous waste containing low concentrations of tungsten are generated during printed circuit board (PCB) or e-waste recycling process. Study has been initiated to develop a suitable emulsion liquid membrane (ELM) technique for the separation and recovery of tungsten [W(VI)] from such waste using Aliquat 336 in hexane as a carrier and sodium hydroxide as a stripping agent.
A Novel Process For Recovery Of Formic Acid Patent
The present invention is directed to a process for recovering concentrated formic acid from an industrial waste aqueous water comprising organic impurities, inorganic impurities and formic acid, comprising the steps of: Distilling the industrial waste aqueous water to recover slightly concentrated formic acid; and Eutectic crystallisation of slightly concentrated formic acid to obtain pure
US 4898719 A Liquid Extraction Procedure For The
1990-2-6 The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.
Modern hydrometallurgical production methods for
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
VanadiumCorp Resource acquires all patent rights
2020-11-27 The Company is focused on the commercial development of its 100% owned VanadiumCorp-Electrochem Processing Technology “VEPT”, a green and efficient chemical process invented by Dr. Francois Cardarelli, that addresses the recovery of vanadium, iron, titanium, and silica from feedstocks such as vanadiferous titano-magnetite, iron ores and
US 3,256,058 A Process for recovery of tungsten
Patent US3256058A Process for recovery of tungsten from scheelite and wolframite ores (US 3,256,058 A); Owner: Blair Burwell; Filed: 05/13/1965; Est. priority date: 05/13/1965; Status: Expired du...
US 3,158,438 A Solvent extraction process for
Patent US3158438A Solvent extraction process for recovering tungsten values from contaminated aqueous solutions (US 3,158,438 A); Owner: Charles R. Kurtak; Filed: 09/19/1962; Est. priority date:
tungsten recovery from magnetite ore
tungsten ore recovery systems, Patent US. Gravity separation method is the main method of black tungsten ore dressing process The tungsten,recovery process In small tungsten ore,magnetic separation. More Price. TUNGSTEN. Scheelite ore at Darwin, United,minerals might lead to lower process recovery,also together with gold, fluorite or
Class Definition for Class 518 United States Patent
For the purpose of purification or recovery of a Fischer-Tropsch process product, Class 518 provides for any physical process required, but only two chemical processes are provided for, i.e., hydrogenation with gaseous hydrogen and formation of oximes of the oxygen containing products.
VanadiumCorp Resource acquires all patent rights
2020-11-27 The Company is focused on the commercial development of its 100% owned VanadiumCorp-Electrochem Processing Technology “VEPT”, a green and efficient chemical process invented by Dr. Francois Cardarelli, that addresses the recovery of vanadium, iron, titanium, and silica from feedstocks such as vanadiferous titano-magnetite, iron ores and
Patent Department of Atomic Energy
2014-10-30 A process for the isolation of Recombinant nucleotide sequence comprising1-2381 base pairs(bp) for early detection of oral cancer (Also Ref. 868/MUM/2001) 392/BOM/1999 24-May-1999
VanadiumCorp Receives Patent for Exclusive Recovery
2018-9-6 The patent dated August 30, 2018, is listed under the Patent Cooperation Treaty, with the International Patent Application designation WO 2018/152628. What
Lithium Australia advances patent for ‘revolutionary
2020-8-6 Process route. Patent application PCT/AU2019/050540 details Lithium Australia’s process for recovering lithium phosphate from lithium-bearing solutions such as brine or pregnant process liquor. If granted, it will protect the company’s process route, developed during testwork prior to completion of the SiLeach® pilot program in 2018.
VanadiumCorp Resource Inc. Acquires All Patent
VanadiumCorp Resource Inc. (TSX VENTURE: “VRB”) (OTCBB:”APAFF”) (FRANKFURT:”NWN”) (the “Company”) is pleased to announce that it has fully executed a patent purchase agreement (the “PPA”) with Québec, Canada based Electrochem Technologies and Materials Inc. (“Electrochem”).Pursuant to the terms of the PPA, VanadiumCorp has purchased all patent rights for the
纪娜_百度百科
纪娜，天津大学环境科学与工程学院，博士生导师，中国农工民主党党员。博士毕业于中国科学院大连化学物理研究所，曾就职于德国马普学会煤化学研究所、美国特拉华大学化学工程系，担任博士后研究助理。目前担任环境科学与工程学院副教授、博士生导师、天津大学北洋青年骨干教师，环境
