Method for Smelting Ferro-tungsten Alloy

The steps are firstly putting the steel filings or iron filings directly in the reactor of electric furnace and heating to 1540-1590 deg.C to make them melt, the mixture material mixed in accordance with a specific proportion of concentrate tungsten ore, aluminium grains and sodium nitrate is added in the reactor with speed of 70-119 kg/min.sqm, continuing to heat while charging to make the furnace temp. rise to 2500-3000 deg.C, after charging, continuously replenishing heat to the fusant to make the temp. of cinder above its melting point for 7-20 min.,l stopping heating to make the fusant in furnace nuturally cool to tapping. The advantages are short of smelting course, simple and applied method, low energy consumption, having no need of ignitor and economizing reducer.


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Manufacturing Method of Tungsten Powder

The present invention provides a method a fine powder of tungsten powder, tungsten powder by dispersing in an aqueous solution containing an oxidizing agent to the surface of the particles of the tungsten powder to form an oxide film and the oxide film is removed with an alkali aqueous solution; providing a thin tungsten The method of producing the powder by the method comprising the step of powder having an average particle size of 0.05 ~ 0.5μm tungsten powder; and the provision of a tungsten powder having an average particle size of 0.05 ~ 0.5μm, and the average particle diameter d (μm), the true density M (g / cm3) and a BET specific surface area S (m2 / g) of the product (dMS) value within the range of 6 ± 0.8.


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Preparation of High Purity Spherical Tungsten Grains

The present invention relates to a method for preparing high purity spherical tungsten particles, comprising the steps of: (a) calcining of ammonium paratungstate spherical having 6 to 12 hours at a high temperature of 1000 ℃ ~ 1250 ℃ prepared tungsten oxide; (2) tungsten oxide were reduction, the reduction temperature is 1250 ℃ ~ 1450 ℃, the reduction time of 10 to 12 hours, the hydrogen purity of 99.99%, a dew point of -83 ℃, under the environment of reducing the amount of the boat; After ball milling (3) reduction in a reductive elimination of produced during agglomeration and caking, and to obtain a uniform dispersion of spherical tungsten particles; (4) via spherical tungsten particles were then sieved after ball milling process to obtain high purity spherical tungsten particles.

Particle size of the spherical high-purity tungsten of the present invention is prepared by 0.1 ~ 2mm, a purity greater than 99.95%, the spherical rate is greater than 97%.


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Manufacturing Method of Tungsten-yttrium Electrode

The invention discloses a method for producing a tungsten-yttrium electrode, which comprises: a. yttrium nitrate water solution is evenly mixed with a solid material containing ammonium paratungstate(APT) or tungsten trioxide(WO3) in the mode of spray mixing, and heated and dried to prepare tungsten-yttrium coating powder; b. the prepared tungsten-yttrium coating powder is reduced twice to obtaintungsten-yttrium powder, and the tungsten-yttrium powder is pressed and sintered to obtain a tungsten-yttrium cored bar; and c. by adopting the pressure processing forging method, the prepared tungsten-yttrium cored bar is made into the tungsten-yttrium electrode. In the method, the yttrium nitrate water solution is evenly mixed with the solid material containing the ammonium paratungstate(APT) or the tungsten trioxide(WO3) in the mode of spray mixing; due to the spraying mode, the yttrium nitrate water solution coats the surface of the ammonium paratungstate(APT) or the tungsten trioxide(WO3), so the mixing, stirring and drying of the yttrium nitrate water solution and the solid material are completed together, thereby achieving the aim of preparing the even tungsten-yttrium coating powder, improving the production capability, making the coating powder more even and effectively improving the performance of the tungsten-yttrium electrode in welding.


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Determination of Tungsten Content of Impure Tungsten Products

A method for the determination of impurities in the tungsten content in the tungsten products, tungsten and impurities completely independent of each other, characterized in that, the sample was calcined to oxide conversion; sodium hydroxide solution to dissolve and purify, so that the tungsten trioxide is totally and completely decomposed, and as the impurity element and the insoluble oxide precipitate in the bottom left; direct quantitative draw tungstate supernatant was acidity of pH4.0-5.0, micro-boiling, organic precipitant 8- hydroxyquinoline quantitative precipitation of tungsten, and incubated in a water bath 60-70 ℃; ashing the organic precipitate, is ultimately fired at 700-800 ℃, tungsten fully and completely burning a tungsten trioxide, weighed and This calculates the tungsten content of the sample.

The method of the present invention is simply to eliminate interference of impurity elements, which greatly increases the speed of analysis, accuracy of analysis, the test results with good reproducibility.


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Method for Recovering Tungsten

A method for recovering tungsten from a reaction mixture obtained by reacting an organic compound with hydrogen peroxide in the presence of a tungsten catalyst comprising blowing a gas into the reaction mixture to precipitate tungstic acid (WO3.H2O) and separating tungstic acid precipitated.

A method for recovering tungsten from a reaction mixture, wherein the reaction mixture of an organic compound and hydrogen peroxide in the presence of a catalyst obtained by reacting a tungsten containing gas is bubbled into the reaction mixture to precipitate and separating the precipitated WO3 -H2O acid wherein the reaction of oxidation of organic compounds with hydrogen over; and wherein the organic gas is not, or the reaction mixture in the reaction with the oxidation product of unreacted.


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Submicron Narrow Particle Size Distribution Type Tungsten Powder and Tungsten Carbide Powder and Preparation Method

The invention relates to submicron narrow particle size distribution type tungsten powder and tungsten carbide powder and a preparation method thereof, and belongs to the field of metallurgic powder preparation of refractory metal powder.

The submicron narrow particle size distribution type tungsten powder and tungsten carbide powder are characterized in that the average particle size is 0.1 to 1.0 micron, and the maximum particle size is not greater than twice of the average particle size. The preparation method comprises the following steps: taking an ammonium tungstate solution as a raw material and a high molecular surfactant as a dispersing agent; reinforcing the dispersion effect through alcohol or ketone; quickly crystallizing and drying by spray drying to obtain fine particle hollow thin-walled spherical ammonium tungstate crystals; and performing pyrolysis, hydrogen gas reduction and carbonizing; and then generating submicron narrow particle size distribution type tungsten powder and tungsten carbide powder in situ.

According to the preparation method, the submicron narrow particle size distribution type tungsten powder and tungsten carbide powder can be prepared in situ; and the technology is reformed and upgraded on the basis of the existing production condition of the enterprise, so that the scale production is easily realized, the production efficiency is high, and the effect is great.


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Aluminium-tungsten System Intermediate Alloy and Preparing Method

The invention is an Al-Wu system medium alloy and preparing method.

Its components (wt%): Wu 10-75, Nb 0-75, Mo 0-75, Ti 0-20 and the rest Al. It can adopt out-furnace ignition smelting: the drying temperature of the raw material 70-80 deg.C, when mixing, add with burden residue accounting for 5-15% of total weight of the raw material; also adopt medium-frequency furnace melting: when mixing according to the above proportion, add with antioxidizer and fluxing agent.

The smelting is stable, avoiding the phenomenon that the smelting current is sometimes high and sometimes low. When preparing Ti alloy, it is able to add the Wu-Al system medium system in alloy package mode.


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Method for Preparing Nano-tungsten Powder From Calcium Tungstate

The present invention provides a method for the preparation of nano calcium tungstate tungsten powder.

Comprising the steps of: calcium tungstate is made in close contact with the conductive metal cathode electrolysis, in soluble or insoluble anode material is ancillary to CaCl2 mixture with other alkali metal or alkaline earth metal in an electrolyte; electrolyte set sealing the cell may be heated in water to remove the electrolyte temperature, then heated to the reaction temperature under an inert atmosphere to protect the electrolysis; After the reaction was completed, the electrolyte is heated under an inert atmosphere, into the cathode immersed in the molten salt, and washed to remove residual impurities; remove the cathode product, deionized water to remove surface residual electrolyte soaked, then dried under vacuum to obtain nano-tungsten powder.

The present invention solves the existing differential deposition of tungsten powder molten salt electrolysis of molten salt electrolysis quality and solid-state direct reduction of post-electrolysis speed slow enough.


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Recovery and Processing Method of Waste Hard Alloy Material

According to this invention, the waste block or powder of hard alloy generated during application and production and the waste tungsten block, filament, powder and tungsten dioxide, may be used to make W-Co kind or W-Co-Ti kind of hard alloy or spray coating (welding) powder of hard alloy with uniformly distributed Co and tungsten carbide whose grain size is 0.6-1.0 micrometers through following steps: breaking, cleaning, calcine, reduction, carbonization, regulation and manufacture of hard alloy. Its technological process is stable.

A method of recycling waste carbide by crushing electric melting method and the selective method of cleaning the zinc melt, the composition of the milling step, which is characterized by a secondary raw material of tungsten, including the use of the process of production and the production process carbide cobalt content of various waste materials and powder blocks, scrap metal tungsten block, tungsten wire, tungsten powder and tungsten dioxide, crushing cleaning, roasting, milling, screening reduction with carbon carbide milling screening and adjustment processes in the system tungsten - tungsten carbide-cobalt composite powder or - cobalt composite powder.

waste-carbide


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