Tungsten is an important strategic metal widely used in steelmaking, electronics, lighting, aerospace, and other industries. As a soluble tungstate intermediate, potassium tungstate (K2WO4, CAS 7790-60-5) has phase composition and impurity control characteristics that directly affect the reproducibility of downstream formulations.
Two common challenges arise in procurement. First, specifications for the main component content and impurities are often inconsistent, with varying levels of control over associated impurities such as sodium, molybdenum, arsenic, tin, and antimony. Second, many applications require not simply a "tungsten source," but a "tungsten source that also supplies potassium." In such cases, substituting sodium tungstate may introduce unwanted sodium into the system.
Potassium tungstate is a colorless or white crystalline powder with a monoclinic crystal structure. It has a molecular weight of 326.03, a crystal density of approximately 3.12 g/cm3 (at 25 °C), and a melting point of approximately 921 °C.
Its solubility in water is approximately 51.5 g/100 mL at 20 °C. It is readily soluble in water but insoluble in alcohol. The compound is hygroscopic and should therefore be stored in a tightly sealed container under dry conditions.
In aqueous solution, K2WO4 dissociates into K+ and WO42- ions, making it a source of both soluble tungsten and soluble potassium.
Under acidic conditions, treatment with strong acids can precipitate tungstic acid, while reaction with phosphoric acid can produce phosphotungstic heteropoly acids. In combination with hydrogen peroxide, potassium tungstate can form active peroxotungstate species. It can also form stable complexes with organic acids such as oxalic acid and citric acid, facilitating the preparation of homogeneous systems.
In terms of solubility, potassium tungstate and sodium tungstate are both readily soluble tungstate salts. Their key difference lies in the cation: the introduction of potassium provides different crystallization and solubility windows and determines whether the compound is suitable for sodium-sensitive formulations.
Peroxotungstate systems formed from potassium tungstate and hydrogen peroxide can be used in olefin epoxidation, the oxidation of alcohols and sulfides, and the selective oxidative desulfurization of fuel oils.
Potassium tungstate can serve as a precursor for the preparation of functional tungsten oxides, such as potassium tungsten bronze (KxWO3), as well as hydrothermally synthesized nanomaterials. It can also be used as a potassium-based additive in electrolytes for molten carbonate fuel cells.
In tungsten refining, potassium tungstate can serve as a soluble tungstate intermediate, which can subsequently be converted into tungstic acid, ammonium paratungstate (APT), and tungsten trioxide (WO3) for use as feedstock in tungsten powder production.
In tungsten wire systems requiring potassium doping, potassium tungstate can simultaneously introduce both potassium and tungsten.
Additionally, potassium tungstate can serve as a tungsten source in the formulation of specialty glasses, ceramics, and other functional materials. It can also be used as an analytical reagent and an alkaloid precipitating reagent.
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Our company can supply potassium tungstate products with phase composition, particle size, and impurity specifications tailored to specific formulation requirements, helping downstream customers enhance material performance and optimize manufacturing processes.
