Tungsten Crucible Price Ø500xØ460x400mm on Sep. 29, 2016
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- Category: Tungsten & Sapphire Growth Furnace Price
- Published on Thursday, 29 September 2016 16:32
- Hits: 1517
Sapphire growth furnace used tungsten crucible price Ø500xØ460x400mm with purity over 99.95% is 19,500.00 USD/PC, FOB XIAMEN, CHINA, Sep. 29, 2016
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Testing Trace Bismuth in High Purity Ammonium Metatungstate -- Co-Precipitation-HG-AFS Method
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- Category: Ammonium Metatungstate
- Published on Wednesday, 28 September 2016 11:36
- Hits: 2088
Ammonium metatungstate (AMT) is an important intermediate compound of tungsten wet smelting process, with appearance of white and little yellow crystal. In recent years, as the requirement of tungsten product purity being higher and higher, for controlling and accurate detecting of impurity content in tungsten products, the required analysis of impurity element types gas been more and more. A study has put forward a method of co-precipitation-HG-AFS to testing trace bismuth in high purity ammonium metatungstate; HG-AFS refers to hydride generation atomic fluorescence spectrophotometry, which has shown to have advantages of high sensitivity, good selectivity and small matrix interference.
Steps of co-precipitation-HG-AFS method to detect trace bismuth in high purity ammonium metatungstate are as follows:
1. Weigh 0.125g (Accurate to 0001g) of high purity (99.995%) ammonium metatungstate sample in 50mL beaker, add a small amount of water, suitable amount of coprecipitation agent and KOH (The standard addition test requires adding standard solution in advance);
2. Carry out filtration after heated for 15min at low temperature, and wash the precipitation and the beaker twice by using KOH solution, again to wash twice with water;
3. Then goes on operation of coprecipitation twice, transfer to 25mL volumetric flask and add 5.0mL HCI, 2mL tartaric acid solution after the precipitation dissolved with hydrochloric acid solution (HCl), then diluted with water to scale, shake well to get mixture solution under test;
4. Test the ready solution by atomic fluorescence spectrometer;
5. Prepare series of different concentrations of bismuth standard solution, test the fluorescence intensity according to running program, and process data with computer, draw standard curve using monadic linear regression equation to calculate the content of bismuth.
The aim of choosing hydrochloric acid (HCl) as Current-carrying medium is to obtain bismuth fluorescence with high strength and stability, while, when the solution acidity is changing among 1~6mol/L, bismuth fluorescence value changed little, however the increasing acidity will help to eliminate the interference.
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2016.09.28-G25 Tungsten Carbide Polished Ball Ø15.875mm Price
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- Category: Tungsten Carbide Price
- Published on Wednesday, 28 September 2016 11:09
- Hits: 1500
As reported by Chinatungsten Online, the current price of YG6 G25 tungsten carbide polished rod for Ø15.875mm is $5.10 per piece EXW Xiamen, China on Sep.28, 2016.
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2016.09.28-Tungsten Copper Electrode Ø6mmx150mm Price
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- Category: Tungsten Copper Price
- Published on Wednesday, 28 September 2016 11:06
- Hits: 1431
As reported by Chinatungsten Online, the current price of 75%W25%Cu tungsten copper rod of Ø6mmx150mm is $4.50 per piece EXW Xiamen, China on Sep.28, 2016.
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2016.09.27- Tungsten Carbide Polished Rod Ø4.5mmx50mm Price
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- Category: Tungsten Carbide Price
- Published on Tuesday, 27 September 2016 09:02
- Hits: 1480
As reported by Chinatungsten Online, the current price of YG10X tungsten carbide polished rod for Ø4.5mmx50mm is $1.00 per piece EXW Xiamen, China on SEP.27, 2016.
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2016.09.27-Tungsten Copper Plate 100mmx100mmx1.6mm Price
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- Category: Tungsten Copper Price
- Published on Tuesday, 27 September 2016 08:58
- Hits: 1377
As reported by Chinatungsten Online, the current price of 90%W10%Cu tungsten copper plate of 100mmx100mmx1.6mm is $32.00 per piece EXW Xiamen, China on SEP.27, 2016.
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2016.09.23-YG6 Tungsten Carbide Ball Ø10.00mm Price
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- Category: Tungsten Carbide Price
- Published on Friday, 23 September 2016 10:05
- Hits: 1474
As reported by Chinatungsten Online, the current price of YG6 tungsten carbide ball for Ø10.00mm is $1.50 per piece EXW Xiamen, China on AUG.17, 2016.
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2016.09.23-Tungsten Copper Tube Ø3mmxØ0.5mmx175mm Price
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- Category: Tungsten Copper Price
- Published on Friday, 23 September 2016 10:01
- Hits: 1397
As reported by Chinatungsten Online, the current price of 75%W25%Cu tungsten copper tube of Ø3mmxØ0.5mmx175mm is $25.00 per piece EXW Xiamen, China on AUG.17, 2016.
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2016.09.21- Tungsten Carbide Ball Ø0.7mm Price
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- Category: Tungsten Carbide Price
- Published on Wednesday, 21 September 2016 09:27
- Hits: 1448
As reported by Chinatungsten Online, the current price tungsten carbide rod for Ø0.7mm of YG6x is $0.00129 per piece EXW Xiamen, China on AUG.15, 2016.
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2016.09.21-Tungsten Carbide Copper Rod Ø13mmx250mm Price
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- Category: Tungsten Copper Price
- Published on Wednesday, 21 September 2016 09:23
- Hits: 1367
As reported by Chinatungsten Online, the current price of 70%WC30%Cu tungsten carbide copper rod of Ø13mmx250mm is $45.50 per piece EXW Xiamen, China on AUG.15, 2016.
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