Intermediates from Decomposition of Ammonium Paratungstate

Image of APT

Ammonium paratungstate (APT) is a white crystalline salt with the chemical formula (NH4)10(H2W12O42)·4H2O. It is considered as the most important raw material for the tungsten industry. The majority of tungsten-based catalysts are derived from the reduction of APT.

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Nanoscale Tungsten Carbide by Plasma Synthesis of Ammonium Paratungstate

Image of Plasma system

Tungsten carbide (WC) has excellent properties of high hardness, high strength, high rigidity, good wear resistance, and thermal conductivity. It has wide application files of tools in the metalworking, drilling, and mining industries under severe conditions of high-pressure, high-temperature, and corrosive environment. These mechanical properties is affected by the composition and microstructural parameters including the grain size. It is known that reduction of WC gives a significant improvement in the mechanical properties of the consolidated compacts. So, an efficient and useful production method of nanoscale WC powder is necessary.

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Crystalline Ammonium Tungsten Bronze by Thermal Decomposition of Ammonium Paratungstate (APT)

DTG curves of decomposition of APT

The metastable phases of tungsten oxides or oxide bronzes, such as the hexagonal and the pyrochlore-types AxWO3, have caught much attention because of their one- or three-dimensional opened-tunneling structures. They have been used in the fields of electrochromic devices, humidity and gas sensors and secondary battery.

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Preparation of WC Based Cemented Carbide by Using Ammonium Paratungstate as Binder

SEM image of nonmagenetic cemented carbide

Non-magnetic tungsten carbide (WC) is a kind of hard alloy material with no magnetism or weak magnetism.  It has excellent properties of high hardness, high T.R.S. and high corrosion resistance.  Its applications include the production of standard parts, cold heading, cold punch, and cold mold. It can also be used in non-magnetic wear parts.

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Production Method of Nanostructured W–Co Powder by Thermal Reduction of Cobalt Doped Ammonium Paratungstate

The XRD spectra of the powders reduced at 650 °C for 30 min

Tungsten carbide-cobalt (WC–Co) is an alloy of hard, ceramic tungsten carbide and the ductile cobalt, often known as cemented carbide. Some of the noteworthy properties of this alloy are strength, hardness, high electrical and thermal conductivity and high malleability and ductility.

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N−Doped WO3 Photocatalyst by Thermal Decomposition of Ammonium Paratungstate (APT)

Image of Diffuse reflectance UV–vis absorption spectra

Titanium dioxide (TiO2) might have wider applications in our daily life than you think. It has been applied in daily products, such as paints, toothpaste, food additive, dyes, sun creams, varnishes, textiles, paper and plastics. Another important application of TiO2 is as a semiconductor. It has the function to purify air, water and soil polluted with various hazardous chemicals.

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Cobalt Doped Ammonium Paratungstate (APT) Precursor by Thermochemical Decomposition

Image of Cobalt

Tungsten carbide cobalt (WC-CO) is an alloy of a hard ceramic phase, tungsten carbide (WC) and a ductile metallic phase, the cobalt (Co). Significant properties of WC-Co are hardness, strength, high breaking and beating ductility as well as high electrical and thermal conductivity. By varying the cobalt content between 0 and 20 mass per cent, hard metals can cover a hardness range from tempered steel to super-hard alloys. From hard metals, mainly tools are produced for chipping (turning, milling, drilling) or non-chipping shaping (drawing, rolling, spinning), as well as for cutting or breaking of metals, wood, stone, and ores. Applications of WC-Co in life include surgery equipment, nozzles or reinforcements, small balls in ball pens, hard metal driller, and hard metal coated circular saw blades.

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Recovery of Tantalum By Crystallization of Ammonium Paratungstate (APT) from Mother Liquor

image of recovery process

It is found that tantalum (Ta) and niobium (Nb) in concentrate of wolframite ((Fe,Mn)WO4) has been wasted: some of it goes to the insoluble residue after ammonium-leaching of the tungstic acid slurry; most of it goes to the solution of ammonium tungstate when (Fe,Mn)WO4 concentrate was digested by hydrochloric acid and the slurry of tungstic acid obtained was leached in ammonia. When the ammonium paratungstate (APT) was crystallized from the solution of ammonium tungstate, Ta and No were almost completely left in the mother liquor and their content reached up to 16 g/litre.

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Ammonium Paratungstate (APT) to Synthesis W-A12O3 Nanoscale Composite

SEM image of W-A12O3 Nanoscale Composite

Ammonium paratungstate (APT), as a significant starting material for tungsten, which can be derived into the majority of tungsten products. Wolframite or scheelite (CaWO4) concentrates are the two common materials are APT. There are two important steps in production of metallic tungsten from APT. The first step is thermal reduction of APT powder by heating at 400–900 °C, which leads to ammonia and water elimination as well as the crystallization of tungsten trioxide (W03). In the second step, an even higher temperature is required. WO3 powder was heated under H2 at 600–1100 °C, and metallic tungsten is then prepared.

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Tungsten Alloy Door Applied for X-ray Department

tungsten alloy door applied for X-ray department picture

Tungsten alloy door is a new shielding door for medical applications such as X-ray department. In X-ray department, routine CT examination, MR examination interventional radiation diagnosis and treatment are undergoing. These departments use X-rays and other medical rays to assist diagnosis and treatment. Tungsten alloy protective door having strong absorption and shielding properties to X-rays and other radiation can play a good radiation shielding effect.

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