Ammonium Metatungstate Price on Dec. 9th, 2016
- Category: Ammonium Metatungstate
- Published on 09 December 2016
- Hits: 2084
Ammonium metatungstate price with purity over 91.40% from Chinatungsten Online is 35.50 USD/KG, by Chinatungsten FOB Xiamen, Dec. 9th, 2016.
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2016.12.08-Tungsten Carbide Ball Price
- Category: Tungsten Carbide Price
- Published on 08 December 2016
- Hits: 1716
As reported by Chinatungsten Online, the current price of YG6 tungsten carbide ball for Ø11.05mmx5mm is $26.00 per piece EXW Xiamen, China on DEC.8, 2016.
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2016.12.08-3W3 Tungsten Copper Rod Price
- Category: Tungsten Copper Price
- Published on 08 December 2016
- Hits: 1530
As reported by Chinatungsten Online, the current price of 3W3 tungsten copper rod of Ø25mmx300mm is $120.00 per piece EXW Xiamen, China on DEC.8, 2016.
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Tel.: 86 592 5129696; Fax: 86 592 5129797;Email: |
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Ammonium Metatungstate Producing Ammonium Trithiotungstate
- Category: Ammonium Metatungstate
- Published on 07 December 2016
- Hits: 1701
Ammonium trithiotungstate [(NH4)2WOS3] is a kind of important glucosinolates metal ammonium salt, which can generate transition-metaldichalcogenide of WS2 after the thermal decomposition, and has very well application in the synthesis of biological nitrogenase activity center - tungsten iron sulfur atom cluster compounds, semiconductor, superconducting, photoelectrochemical solar cell, battery, lubricant, electrochemical sensor, nanometer material, super capacitor, new generation of transistor and hydrogen storage and electrode material, and other respects. While it is also the precursor of coal liquefaction and heavy oil hydrogenation catalyst, as well as the raw material for manufacturing supported and non-supported type of tungsten sulfide hydrogenation catalyst.
Ammonium trithiotungstate can be prepared by the reaction of tungstic acid of ammonia solution and hydrogen sulfide gas, however, this method is harsh in operating conditions and the process is hard to control; moreover, the used hydrogen sulfide gas has the shortcomings of irritation, poisonous and cacosmia, which will cause serious damage to human body and the environment. So, an invention has pointed out an environmental friendly method to prepare ammonium trithiotungstate from the raw material of ammonium metatungstate (AMT), with the steps like bellow:
1. Weight a certain amount of ammonium metatungstate powder and add them into ammonium sulfide solution with a certain concentration to carry out a reaction, the molar ratio of W/S is controlled at 1:3~3.5, and the condition is optimized of 40~60°C, time for 1~2 hours;
2. Remove the ammonia gas by the way of vacuum or inlet inert gas into the reaction liquid, thus to release the generated ammonia gas out of the reaction system;
3. Add a certain amount of ammonium salt into the reaction liquid, then cool down to room temperature and stay to crystallize for 0.5~24 hours;
4. Filter, wash with a solvent, dry under the room temperature to finally get high purity ammonium trithiotungstate.
Vacuum or inlet inert gas into the reaction liquid in the process can play the role of promote the balance to the direction of generating ammonium trithiotungstate; meanwhile, the addition of ammonium salt will be benefit for the exhalation rate of ammonium trithiotungstate, and to get high purity product. The method which based on the raw materials of tungstate (such as ammonium metatungstate) and ammonium sulfide solution to produce ammonium trithiotungstate has the advantages of less waste discharging, no need to use poisonous hydrogen sulfide gas, sample process, environmental friendly and high yield (as high as 98% or even higher), thus to has very high industrial application prospect.
| AMT Supplier: Chinatungsten Online ammonium-metatungstate.com |
Tel.: 86 592 5129696; Fax: 86 592 5129797;Email: |
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2016.12.06-Tungsten Copper Sheet Price
- Category: Tungsten Copper Price
- Published on 06 December 2016
- Hits: 1512
As reported by Chinatungsten Online, the current price of 50%W50%Cu tungsten copper sheet of 1mmx75mmx245mm is $50.00 per piece EXW Xiamen, China on DEC.6, 2016.
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2016.12.06-Tungsten Carbide Inserts Price
- Category: Tungsten Carbide Price
- Published on 06 December 2016
- Hits: 1704
As reported by Chinatungsten Online, the current price of tungsten carbide inserts for WNMG080408 EFYB9205 is $2.20 per piece EXW Xiamen, China on DEC.6, 2016.
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Ammonium Metatungstate Preparing Nano Tungsten Oxide Aqueous Solution
- Category: Ammonium Metatungstate
- Published on 05 December 2016
- Hits: 2116
Nano tungsten oxide can not soluble in water itself, the so called nano tungsten oxide aqueous solution is the dispersion which nano tungsten oxide particles are uniformly distributed in water, to play the roles of oxidization and reunion of tungsten oxide. Tungsten oxide is the typical transition metal oxides, while the nano tungsten oxide is a new type of functional material, and because of its excellent discoloration performance, it can be widely used in many fields, such as intelligent window, large area flat panel display, gas sensor, dye-sensitized solar cell, automatic mirror, energy storage.
Ammonium metatungstate (AMT) is the important intermediate compound of tungsten metallurgy, and being the important raw material for manufacturing tungsten oxide, tungsten and tungsten carbide powder and other tungsten products. An invention has proposed one method to prepare nano tungsten oxide aqueous solution from the raw material of ammonium metatungstate and sodium borohydride, with the steps like bellows:
1. Weight the appropriate amount of ammonium metatungstate and sodium borohydride according to the mass ratio of 1~10:1;
2. Add the AMT powder into deionized water to dissolve with stirring and get the ammonium metatungstate aqueous solution with the concentration of 5~50%;
3. Add the weighted sodium borohydride solid into the AMT solution and stir to mix them uniformly, stay to react for 10~60 minutes under the room temperature to 95°C to get the blue nano tungsten oxide aqueous solution with 0.1〜10nm uniform particle size. since the ammonium metatungstate will react with sodium borohydride to generate blue nano WO2.9, and it will release heat, a large number of hydrogen gas and ammonia gas during the reaction process, which will remove purity of ammonium ion.
Nano tungsten oxide aqueous solution prepared by this method has the advantages of good stability, small particle size of nano tungsten oxide and others, thus to have wide application in intelligent window, gas sensor and solar energy cell and other fields.
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Ammonium Metatungstate Preparing Nanoscale Zirconium Tungstate Hollow Sphere
- Category: Ammonium Metatungstate
- Published on 30 November 2016
- Hits: 2267
The cubic zirconium tungstate is one of the hotspots in the research of negative thermal expansion materials, with its widest range of negative expansion effect, high negative expansion coefficient and isotropy and other advantages, it can be combined with positive expansion into the specific materials with zero or low expansion, and thus to be used in the some devices which is used under extreme temperature conditions field of aerospace. The preparation methods of zirconium tungstate are solid phase sintering, sol-gel, combustion, chemical coprecipitation and microwave method ect., however, the zirconium tungstate particles or whiskers prepared by these methods are irregular, and can not be used in some specific fields, such as aerospace.
There is an invention disclosed a method for preparing nanoscale zirconium tungstate hollow sphere by hydrothermal synthesis method from the raw materials of ammonium metatungstate (AMT) and zirconium oxychloride, with the steps as following:
1. Respectively weight the right amount of ammonium metatungstate and zirconium oxychloride according to the stoichiometric ratio of zirconium tungstate (ZrW2O8), respectively, and prepare zirconium oxychloride aqueous solution and ammonium metatungstate aqueous solution respectively;
2. Add zirconium oxychloride aqueous solution into ammonium metatungstate aqueous solution under the condition of stirring, then preheat the mixture at the temperature of 60～70℃ with stirring continuous;
3. Add hydrochloric acid solution with continuously stirring, and then heat the solution to 80~100℃, then we get the zirconium tungstate precursor suspension after keeping the temperature for a proper time;
4. The zirconium tungstate precursor suspension is carried out a hydrothermal reaction at a temperature of 170~190℃, followed by cooling, collecting the precipitate and washing to remove chloride ions (Cl- ), drying, calcining at 800~1000℃, and finally to obtain nanoscale zirconium tungstate hollow sphere.
In this method of preparing zirconium tungstate by using AMT as raw material, due to the hydrothermal synthesis method can truly realize synthesizing zirconium tungstate powder at a low temperature, cut down the synthesis time of the precursor and control the direction of crystal growth; thus, the prepared nanoscale zirconium tungstate hollow sphere has the benefits of uniform particle size, good negative expansion performance and low density ect., and to have great potential for applying in aerospace field.
| AMT Supplier: Chinatungsten Online ammonium-metatungstate.com |
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Ø2.4x150.0mm Thoriated Tungsten Electrode Price on Nov. 30, 2016
- Category: Tungsten Electrodes Price
- Published on 30 November 2016
- Hits: 2036
WT20 thoriated tungsten electrode price with Ø2.4x150.0mm is 0.6875USD/pc, EXW XIAMEN, CHINA, Nov. 30, 2016.
The MOQ for this diameter under such price is 5,000pcs.
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Coil Tungsten Filament Price on Nov. 30, 2016
- Category: Tungsten Metal Price
- Published on 30 November 2016
- Hits: 2110
Coil tungsten filament price with purity over 99.95%, size Ø0.8mm and shape of coil is 2.80USD/PC, EXW XIAMEN, CHINA, Nov. 30, 2016.
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