The invention belongs to the field of powder metallurgy to paratungstate as raw materials, high-pressure direct reduction of green strength of tungsten powder production methods.

Comprising at 700 ~ 1000 ℃ and a hydrogen atmosphere and a hydrogen reduction treatment using recycled, screening impurity. The invention is in the reduction treatment process to avoid the deposition of the tungsten powder to grow up, and incomplete development of the particle morphology and the formation of irregular aggregates or loose crosslinked structure, thereby facilitating press-forming. Which has a shorter production process, the method is simple, advanced, easy to operate controls, reliable, high-purity tungsten powder, combined with high strength, stable quality, which compacts strength of up to 2.0 ~ 3.6MPa, sintered products for large density, high temperature good performance characteristics. It can be widely used in aviation, aerospace production flamethrowers, rocket flight rudder and other parts. BACKGROUND overcome poor formability of tungsten powder, compacts highest intensity 2.0MPa only and can not be further increased, can not meet the aviation, aerospace require the use of other ills.


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The invention relates the method of extracting tungsten and other rare metals from waste and old carbide alloy, belonging to waste and old carbide alloy reclamation and utilization technology field. The method comprises the following steps: melting the waste and old carbide alloy with sodium acid carbonate or sodium carbonate in water, forming ammonium tungstate solution and precipitum containing other rare metals, separating them, heating the tungstate solution, then crystallization, drying, calcining, and adding hydrogen gas to deacidize, get tungsten powder; and mixing the precipitum with sulfuric acid and ammonium oxalate to extract cobalt powder, nickel powder, tantalum and niobium. The method has the advantages of low cost and great economy value.




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The invention belongs to a production method for tungsten alloy for electrode use, including: preparation of rare earth nitrate solution, preparation of rare earth doped with blue tungsten, reducing, preparingunburnt earthenware, sintering and vertically melting. The method takes blue tungsten with large specific surface, developed surface cracks as raw materials, dissolves high purity rare earthnitrate in deionized water as additives; in the production process, slurry evaporation drying methods adopts low temperature agitation evaporation, then higher temperature evaporation for drying to avoid segregation caused by rapid doping precipitation by the direct use of high-temperature drying; Blue-doped tungsten and tungsten powder has loose particles with particle size consistent with mormal, good formability and good sintering properties and physical properties for follow-up processing.

The method has the advantages of advanced technology, reliablity, short process, uniform distribution of rare earth and stable quality, good machining properties and functional performance and can be used for large-scale industrialized production, and other characteristics. The method overcomes frauds of the technical background doping effect and the quality of stability, moldability, downstream processing and poor functional performance ills.




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The present invention provides a process for preparing a homogeneous W - Cu pseudoalloy comprising compressing the tungsten-coated copper composite powder is formed into compacts, and sintering the compacts, the W - Cu composite powder comprises a tungsten phase and a copper phase individual particles, wherein the tungsten phase substantially encapsulates the copper phase.

False copper alloy, comprising compressing the tungsten-coated copper composite powder is formed into compacts, and sintering the compacts, the W - Cu composite powder comprising individual particles having a tungsten phase and a copper phase 1. Preparation of a homogeneous tungsten wherein the tungsten phase substantially encapsulates the copper phase.




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The invention discloses a preparing method of a tungsten-copper alloy plate.

The method is characterized by comprising the following steps of 1, carrying out air-stream smashing on tungsten-copper composite powder; 2, adding plasticizer into an internal mixer, and then slowly adding the tungsten-copper composite powder subjected to air-stream smashing, uniformly kneading the powder, and then breaking the powder to prepare plastic feeding particles; 3, after smashing the plastic feeding particles, adding the smashed plastic feeding particles into an extruder for being subjected to extrusion, and then calendaring the extruded plastic feeding particles to prepare a banding blank material; 4, carrying out thermal debinding on the banding blank material to prepare a degreased blank; 5, carrying out high temperature sintering on the degreased blank to prepare a sintered blank; 6, carrying out cold rolling on the sintered blank for shaping, and obtaining the tungsten-copper alloy plate after annealing.

The density of the banding blank material of the plate prepared through the method provided by the invention is sufficient, so that the possibility of generating defects in the subsequent pressure processing is reduced, the defects, such as microcracks and fracturing are not easily generated, and the rate of finished products is high.




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The invention provides a method for producing a tungsten bar serving as a halogen tungsten lamp tungsten filament, comprising the following steps of: material selecting, pre-reducing, high potassium doping, reducing, acid rinsing, powder preparing, cold static pressure shaping, high temperature sintering and the like. Compared with the conventional technology, the method is characterized in that two crystal ammonium paratungstates are utilized to prepared raw materials, high potassium doping is adopted, preparation of middle granule tungsten powder is added, a powder distribution scheme is optimized by the middle granule tungsten and a unique incipient fusion high temperature sintering process is utilized. In the method, the granularity distribution of the tungsten powder avoids the peak or double peak phenomenon and has good normal distribution, after being sintered at high temperature, the cross section crystal of the tungsten bar is thin and uniform; the tungsten bar is pressed by a powder mixing scheme; according to a forming mechanism of potassium foams, the number of tungsten bar cross section crystal grains is increased; and the partial growth of the crystal grains is avoided so that the potassium foam is small in aperture, large in density, multiple in crystal boundary, long in line and uniform in distribution.




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The present invention relates to a W - Cu composite oxide powder and its preparation method, the powder comprising individual particles having a copper tungstate phase and tungsten trioxide phase wherein the tungsten trioxide phase exists primarily at the surface of the individual particles. The present invention also relates to a method comprising the acid copper tungstate phase and tungsten trioxide phase W - Cu composite oxide powder, wherein the ratio by X-ray diffraction method, of tungstic acid, tungsten trioxide and copper phase, the tungsten is greater than - copper composite oxide powder has the same phase as compared to the measured ratio of the mechanical blend of tungsten and tungsten trioxide acid copper phase by X-ray diffraction.

A W - Cu composite oxide powder, which comprises individual particles having a copper tungstate phase and tungsten trioxide phase wherein the tungsten trioxide phase exists primarily at the surface of the individual particles.


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The invention provides a method for recycling tungsten from molybdenum-removal slag, ammonium tungstate solution with low impurity content can be obtained through the method, and the solution can be directly used as raw material for producing ammonium paratungstate. The molybdenum-removal slag is used as raw material, the method comprises the steps of pre-treating, washing, filtering and testing.The production process of the ammonium paratungstate is optimized by the method, the problem that the molybdenum-removal slag with high tungsten content is difficult to treat is solved, the tungsten in the molybdenum-removal slag is recycled, and the cost is reduced; the method of the invention is high in recovery rate to the tungsten, simple, convenient and easy to operate.

A recovering tungsten from molybdenum slag addition method to remove the molybdenum slag as raw material, characterized in that it comprises a pretreatment step, washing and filtration steps and test steps: a pretreatment step in addition to the molybdenum slag, when dry In addition to molybdenum clinker through the large, coarse crushing processing, in addition to molybdenum slag tune into the bucket in the pulp slurry; in the washing step, through the steam heating, stirring; in filtration and laboratory step by testing the pressure filtrate and the content of the press residues in tungsten trioxide to determine whether the extraction of tungsten has been completed.


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A method of nickel-plated tungsten-copper composite material, characterized by: comprising the following steps: (1) degreasing: Remove the tungsten-copper composite material surface oil; (2) etching: the tungsten-copper composite material is placed in the moment etching solution at room temperature etching l_5min, tungsten copper composite oxide film covering the surface of red-brown, wash; (3) activation: the step (2) etched tungsten-copper composite material is placed in hydrochloric acid at room temperature _40 ° C activation 2-5min, wash; (4) pre-nickel: the step (3) activation of tungsten-copper composite material was placed in a pre-nickel plating bath nickel pre-plated, conditions: room temperature _40 ° C, cathode current density of 4 ~ 8A / dm2, anode using purity of 99.99% of the electrolytic nickel plate, nickel time 2-5min, the coating having a thickness of 0.3 ~ 0.5 μ m; wash; (5) nickel: the step (4 ) nickel pre-plated tungsten-copper composite material was placed in a nickel plating solution and nickel plating, conditions: at 40 ~ 60 ° C, the cathode plate to wavy as the cathode and a sulfur-containing nickel plate as the anode, the first order of 0.20 to 0.5 current density electrolysis 10-15h A / dm2, the electrodeposited color recess wavy bright cathode plate, then add a pH of 3-4.5 of 30 ~ 40g / L of boric acid solution to I ~ 3A / dm2 of current density electrolysis 2-4min, the coating having a thickness of 0.5 ~ I μ m, wash; (6) Heat treatment: the step (5) W-Cu composite material was placed in a nickel-plated chain furnace, mixing in hydrogen and nitrogen atmosphere, 780-810 ° C treatment 0.5-2h; (7) degreasing: removal step (6) tungsten-copper composite material surface dirt after heat treatment; (8) Activation: The tungsten after degreasing step (7) copper composite material is placed in hydrochloric acid at room temperature _40 ° C activation 2-5min, Wash; (9) pre-plated nickel: the step (3) after activation tungsten-copper composite material is placed in a pre-pre-nickel plating nickel plating solution , conditions: room temperature _40 ° C, cathode current density of 4 ~ 8A / dm2, anode using purity of 99.99% of electrolytic nickel plate, nickel time 2-5min, the coating having a thickness of 0.3 ~ 0.5 μ m; wash; (10) Nickel Plating: The step (4) nickel pre-plated tungsten-copper composite material was placed in a nickel plating solution and nickel plating, conditions: at 40 ~ 60 ° C, the wave-shaped cathode plate to the cathode, In sulfur-containing nickel plate as the anode, first to 0.20 ~ 0.5A / dm2 current density electrolysis 10-15h, electrodeposited color recess wavy bright cathode plate, then add a pH of 3-4.5 of 30 ~ 40g / L boric acid solution to the current density electrolysis 10-25min I ~ 3A / dm2, and the coating thickness is 2 ~ 5.5 μ m, washing, drying, too.




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The present invention relates to the preparation of secondary ammonium tungstate with high purity using two-step ion exchange method.

Firstly, the tungsten is absorbed from an alkaline solution by the porous strong alkaline negative ion exchange resin and the desorption solution is acidized to PH 2.5-4. Then,the tungsten is absorbed again by the acrylic acid type weak alkaline negative ion exchange resin and is desorbed by ammonia water. The secondary ammonium tungstate with high purity is obtained by evaporating and crystallizing the desorption solution.During the desorption by ammonia water, an ion exchange column with a drainage tube in the interface between resin layers is used. It can rapidly evade the secondary ammonium tungsten crystalline region with PH 6-8 so as to avoid the separation of crystal and to realize the desorption by fixed bed ammonia water. The density of WO3 in the desorption solution may reach 250-300 g/1. The said process can remove P,As, Si and other impurities, purify molybdenum as well. What's more, its tungsten recovery is up to 99%.




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