System and Method for processing Ferrotungsten and Other Tungsten Alloys Articles forward Therefrom and Methods for Detecting the Same
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- Category: Tungsten Information
- Published on Tuesday, 01 September 2015 16:23
- Written by xinyi
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Systems and methods for refining or otherwise processing tungsten alloys, including ferrotungsten powder and articles formed therefrom, and methods for detecting the presence of the same. The methods include at least one of magnetically-separating and particle-size-separating ferrotungsten or ferrotungsten-containing powder. In some embodiments, powder may be separated to remove fine particles, and optionally to separate the remaining particles into fractions containing selected particle size distributions. The powder additionally or alternatively may be separated into at least magnetic and non-magnetic fractions. In some embodiments, portions of two or more size and/or magnetism fractions are mixed to provide a ferrotungsten-containing feedstock. Selected fractions resulting from the size and magnetism separation steps may be utilized to provide a ferrotungsten-containing feedstock from which articles are produced and which may include additional components.
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Determination of Lead,Tin and Bismuth in the Ferrotungsten by Inductively Coupled Plasma Atomic Emission Spectrometry
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- Category: Tungsten Information
- Published on Tuesday, 01 September 2015 16:20
- Written by xinyi
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Determination of lead,tin and bismuth in the ferrotungsten by inductively coupled plasma atomic emission spectrometry.
A method for the determination of lead,tin and bismuth by inductively coupled plasma atomic emission spectrometry was studied.The sample was decomposed with oxalic acid and hydrogen peroxide.In the medium of ammonia at pH≥9,Pb,Sn and Bi were precipitated and separated from W in the solution.The residual tungsten in the sediment was less than 0.7% after twice precipitation with ammonia liquor.The interferences from residual tungsten could be eliminated by the background correct mode.The restraining influence from iron on the intensity of Pb,Sn could be overcome by matrix matching.The method has been applied to the determination of Pb,Sn and Bi in ferrotungsten with the recovery of 96%-102% and relative standard deviation of 1.3%-1.5%.
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Determination of Copper,Manganese,Silicon in Ferrotungsten by Inductively Coupled Plasma Atomic Emission Spectrometry
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- Category: Tungsten Information
- Published on Tuesday, 01 September 2015 16:10
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An inductively coupled plasma atomic emission spectrometric(ICP-AES) method for the determination of Cu,Mn,Si in the ferrotungsten was studed.The optimal working conditions of instrument were confirmed.The experiment factors including the method for dissolving sample,spectral line of element,and oxalic acid concentration were discussed.The sample was discomposed by oxalic acid-hydrogen peroxide.Throuth selectiong 327.396 nm,279.482 nm and 251.612 nm as the analytical lines of copper,manganese and silicon and adopting appropriate background correction points in oxalic acid medium,matrix elements W,Fe and other coexistent elements have no effect in the determination.So Cu,Mn,Si could be determined directly without separation.The detection limits for Cu,Mn,Si were 0.005 2 μg/mL,0.007 2 μg/mL,0.009 0 μg/mL respectively.This method could be employed in simultaneous determination of Cu,Mn,Si in ferrotungsten,with the RSDs of 0.47%-1.98%.
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Determination of Ar、Sb、Bi Content in Ferrotungsten by the Method of Inductively Coupled Plasma Emission Spectrometry
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- Category: Tungsten Information
- Published on Tuesday, 01 September 2015 16:14
- Written by xinyi
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Determination of Ar、Sb、Bi Content in Ferrotungsten by the Method of Inductively Coupled Plasma Emission Spectrometry
The sample was dissolved with oxalic acid and hydrogen peroxide and processed with mixed acid to remove the tungsten. Determination of arsenic、antimony、bismuth in ferrotungsten by the method of ICP-AES. The results indicated that matrix effect of the tungsten for measuring element was not obvious after tungsten removal. This method was applied to the determination of synthetic ferrotungsten sample,and the results agreed well with the certified values,with recovery rate of 96.5%～102.0%and relative standard deviation of 1.2%～4.6%.
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Determination of Arsenic,Antimony,Bismuth in Ferro-Tungsten by Inductively Coupled Plasma Atomic Emission Spectrometry
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- Category: Tungsten Information
- Published on Tuesday, 01 September 2015 15:56
- Written by xinyi
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The simultaneous determination of arsenic,antimony and bismuth in ferrotungsten was studied by inductively coupled plasma atomic emission spectrometry.The sample was decomposed with oxalic acid and hydrogen peroxide.In the medium of mixed acid,tungsten was converted to tungstate precipitates and thus separated from sample solution.When residual tungsten in sample solution was less than 150 μg/mL,it did not interfere in the determination.The interference of residual tungsten could be eliminated by the background correction mode and matrix matching. The proposed method has been applied to the determination of arsenic,antimony and bismuth in ferro-tungsten,with the recoveries of 95 %-105 %,and the relative standard deviation(RSD) of 0.86 %-3.6 %.
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