Tungsten Price

2016.10.27-Tungsten Copper Tube Price

Published on 27 October 2016

As reported by Chinatungsten Online, the current price of 75%W25%Cu tungsten copper tube of Ø8mmxØ5mmx175mm is $29.30 per piece EXW Xiamen, China on OCT.27, 2016.

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Ø1.6x150.0mm Lanthanum Tungsten Electrode Price on Oct. 26, 2016

Category: Tungsten Electrodes Price

Published on 27 October 2016

WL15 lanthanum tungsten electrode price with Ø1.6x150.0mm is 0.407USD/pc, EXW XIAMEN, CHINA, Oct. 26, 2016.

The MOQ for this diameter under such price is 5,000pcs.

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Ø500xØ460x400mm Tungsten Crucible Price on Oct. 26, 2016

Category: Tungsten Metal Price

Published on 27 October 2016

Ø500xØ460x400mm tungsten crucible price with purity over 99.95% is 19,650.00USD/PC, EXW XIAMEN, CHINA, Oct. 26, 2016.

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Tungsten Crucible Price Ø500xØ460x400mm on Oct. 26, 2016

Category: Tungsten & Sapphire Growth Furnace Price

Published on 27 October 2016

Sapphire growth furnace used tungsten crucible price Ø500xØ460x400mm with purity over 99.95% is 19,650.00 USD/PC, FOB XIAMEN, CHINA, Oct. 26, 2016

The MOQ of sapphire growth furnace used tungsten crucible is 1pcs.

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Ammonium Metatungstate Solubility

Category: Ammonium Metatungstate

Published on 27 October 2016

ammonium metatungstate dissolved in water image

Ammonium metatungstate (AMT) is a white or yellowish crystalline powder, an important tungsten compound which can be used for producing tungsten oxide, tungsten powder and other products, or for the manufacture of all kinds of catalyst in petroleum chemical industry, the main raw material of tungsten based catalyst of oil refineries.

If there are no special instructions, the solubility of ammonium metatungstate refers to it in water; AMT has very good water soluble which is 303.99/100g at 20℃, and its aqueous solution is quite stable with acidity. With the improving of temperature, ammonium metatungstate solubility in water will raise until it reaches the highest solubility which is saturated state. Metatungstic acid and most of its metatungstate can well soluble in water, and the advantage of AMT is its very huge solubility in water, thus it can be directly used and to prepare high concentrated tungstate solution with no alkali metal ions.

Solubility is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a solid, liquid, or gaseous solvent. The solubility of a substance fundamentally depends on the physical and chemical properties of the solute and solvent as well as on temperature, pressure and the pH of the solution. The extent of the solubility of a substance in a specific solvent is measured as the saturation concentration, where adding more solute does not increase the concentration of the solution and begins to precipitate the excess amount of solute. The solubility of a substance is an entirely different property from the rate of solution, which is how fast it dissolves.

The factors that affect solubility are temperature, pressure ect.. Solubility is defined for specific phases. For example, the solubility of aragonite and calcite in water are expected to differ, even though they are both polymorphs of calcium carbonate and have the same chemical formula. The solubility of one substance in another is determined by the balance of intermolecular forces between the solvent and solute, and the entropy change that accompanies the solvation. Factors such as temperature and pressure will alter this balance, thus changing the solubility.

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Ammonium Metatungstate Price on Oct.26th, 2016

Category: Ammonium Metatungstate

Published on 26 October 2016

Ammonium metatungstate price with purity over 91.40% from Chinatungsten Online is 35.50 USD/KG, by Chinatungsten FOB Xiamen, Oct.26^th, 2016.

AMT Photo

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APT Liquid Phase Transformation Method Preparing AMT

Category: Ammonium Metatungstate

Published on 25 October 2016

Ammonium metatungstate (AMT) is an important tungsten compound, mainly used in the manufacture of tungsten oxide, tungsten and tungsten carbide powder and their downstream products ect., also it can be used as catalyst in fields of petroleum cracking, organic synthesis, nitration and so on; besides, with the rapid development of oil refining, petrochemical and other industries, the demand amount of ammonium metatungstate is growing fast. There are many preparation methods for ammonium metatungstate which can be divided into two catalogues of solid and liquid phase transformation method, such as thermal decomposition method, neutralization method, solvent extraction and ion exchange method, wherein the thermal decomposition method which is depending on raw material of ammonium paratungstate (APT) is the mainstream process for preparing AMT in industrial.

For manufacturing AMT with high solubility to meet the requirement of tungsten contained catalyst, an invention has pointed out a liquid phase transformation method to produce ammonium metatungstate which took ammonium paratungstate as raw material; and the result of experiment have shown that this method has the advantages of short process, little investment of equipment ect., furthermore, the product – AMT is highly dissolve in water with the stable quality. The preparation steps are shown as following:

1. Leaching the wet ammonium paratungstate: Mixing the material of wet ammonium paratungstate (which the water content is among 5~10%) and dilute nitric acid (HNO₃) to prepare ammonium metatungstate solution, the chemical reaction is like bellow:

5(NH₄)₂•12WO₃•5H₂O+4HNO₃=(NH₄)₆•H₂W₁₂O₄₀•6H₂O+4NH₄NO₃

2. Converting the dilute ammonium metatungstate solution to concentrated AMT solution: The dilute ammonium metatungstate solution is carried out standing for aging, filtering, heating for concentrating and again filtering for many times to finally get concentrated AMT solution;

3. Spraying and drying the concentrated AMT solution obtained in step 2 with an spray dry tower which will dry AMT feed liquid into powder quickly, thus to get product of AMT powder.

Compared to the traditional method, this kind of liquid phase transformation method requires no calcination step, so it is no need to use rotary kiln which will reduce the fixed investment; at the same time, product per ton will save 120KWH, while the recovery efficiency can be improved for 3%.

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2016.10.24-70WC30Cu Tungsten Carbide Copper Rod Price

Category: Tungsten Carbide Price

Published on 24 October 2016

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 OCT.24, 2016.

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2016.10.24-YG6x Tungsten Carbide Ball Price

Category: Tungsten Carbide Price

Published on 24 October 2016

As reported by Chinatungsten Online, the current price tungsten carbide ball for Ø0.7mm of YG6x is $0.00129 per piece EXW Xiamen, China on OCT.24, 2016.

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Ammonium Metatungstate Price on Oct.21st, 2016

Category: Ammonium Metatungstate

Published on 21 October 2016

Ammonium metatungstate price with purity over 91.40% from Chinatungsten Online is 35.50 USD/KG, by Chinatungsten FOB Xiamen, Oct.21^st, 2016.

AMT Photo

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