Tungsten Electrodes Price

Discussion On Dephosphorization Technology For Smelting Ferrotungsten

Details: Category: Tungsten Information; Published on Wednesday, 02 September 2015 17:11; Written by xinyi; Hits: 314

In line with the mechanism of the suitable basic slag,which can be formed at the melting oxygen stage in the basic electric arc furnace,can remove most of phosphorus in the molten steel,we add certain volume of scheelite during the smelting ferrotungsten process. Slag basicity can be increased and foamed-slag can be formed to remove the phosph-prus in ferrotungsten at the refining stage.

Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important ore of tungsten. Well-formed crystals are sought by collectors and are occasionally fashioned into gemstones when suitably free of flaws. Scheelite has been synthesized via the Czochralski process; the material produced may be used to imitate diamond, as a scintillator, or as a solid state lasing medium. It was also used in radium paint in the same fashion as was zinc sulphide, and Thomas Edison invented a fluoroscope with a calcium tungstate-coated screen, making the images six times brighter that those with barium platinocyanide; the latter chemical allowed Röntgen to discover X-rays in early November 1895.

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Determination of Tungsten in Ferrotungsten by Thiocyanate Colorimetry

Details: Category: Tungsten Information; Published on Wednesday, 02 September 2015 17:09; Written by xinyi; Hits: 287

Colorimetry (American English) or Colourimetry (British English; see spelling differences) is "the science and technology used to quantify and describe physically the human color perception." It is similar to spectrophotometry, but is distinguished by its interest in reducing spectra to the physical correlates of color perception, most often the CIE 1931 XYZ color space tristimulus values and related quantities.

According to the characteristic of tungsten being complexed in medium of phosphoric acid, the specimen is reduced via stannous chloride, catalyzed by titanium trichloride, in strongly acidic medium, tungsten and thiocyanate form yellow complex, and then photometric analysis is made.

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Extraction of Ferrotungsten from Ores with Low WO3 Content

Details: Category: Tungsten Information; Published on Wednesday, 02 September 2015 17:06; Written by xinyi; Hits: 286

Aluminothermic SHS reaction was explored as a possible route to manufacturing ferrotungsten alloy (FeW) from an ore concentrate. Changing green composition, i.e. the amount (x) of Al, it was possible to control the composition and microstructure of resultant alloys. Regardless of green composition, the final product always consisted of three phases: W, FeW, and Fe-Al-W. Compositions of the W and FeW phases were independent of x, while the Al content of the Fe-Al-W phase grew with increasing x. An alloy most closely fitting specification requirements was synthesized from green mixtures with a slightly lower amount of Al as compared to a stoichiometric one.

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Discussion On Smelting Ferrotungsten With Sheelite Concentrate

Details: Category: Tungsten Information; Published on Wednesday, 02 September 2015 17:07; Written by xinyi; Hits: 262

Scheelite is a calcium tungstate mineral with the chemical formula CaWO4. It is an important ore of tungsten. Well-formed crystals are sought by collectors and are occasionally fashioned into gemstones when suitably free of flaws. Scheelite has been synthesized via the Czochralski process; the material produced may be used to imitate diamond, as a scintillator, or as a solid state lasing medium. It was also used in radium paint in the same fashion as was zinc sulphide, and Thomas Edison invented a fluoroscope with a calcium tungstate-coated screen, making the images six times brighter that those with barium platinocyanide; the latter chemical allowed Röntgen to discover X-rays in early November 1895.

In smelting ferrotungsten,using sheelite concentrate to substitute partly wolframite concentrate. By reforming process,charging an enormous amount of low phosphorous,low calcium oxide and high iron oxide during refining,picking and diluting stages respectively,then can decrease the ferrotungsten production cost and obtain obvious benefit.

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Tungsten Carbide Tipped (TCT) Core Drills

Details: Category: Tungsten Information; Published on Wednesday, 02 September 2015 17:04; Written by zhihua; Hits: 280

TCT core drills are made from Tungsten carbide material on their tips. Tungsten carbide is a very hard man material and supposed to be one of the hardest material made by man. TCT core drills are more expensive then HSS core drills but are faster and easy to make bigger holes. There are also different types in TCT core drills. TCT core drills are cheaper for bigger diameter i.e. above 41 mm. They are very efficient for cutting hard material. The chances of tip breakage in TCT core drill is more compared to HSS Core drills. TCT core drills has a disadvantage that it can not be reground. Once the TCT core drill is damaged it has to be thrown away, it can not be re used like the HSS core drills. It is always recommended by manufacturers to use TCT core drills only for larger diameter and for very hard material, while giving priority to HSS core drills because of its price and re-sharpening advantages.

TCT Standard

A Standard TCT core drill is a with tungsten carbide tips. These types of core drills are now available in vast range of diameter, for up to 150 mm. These are popularly used core drills on magnetic core drilling machines. These core drills are popularly used to drill materials like railway tracks, structural steel,stainless steel, cast iron, etc.

TCT with hard coating

The TCT core drills with hard coating are core drills with a coating on it, generally TiN coating. This makes the core drills more resistant to heat, longer tool life and even removal of chips just like the advantage of HSS core drill. The biggest advantage of hard coated core drills is that these cutters are very good for cutting larger diameters on hard material. These core drills are popularly used to drill materials like corroded or weathered material, structural and stainless steel.

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