【Know Tungsten】What is Tungstic Acid?

Tungstic acid is yellow and shiny flaky crystal or crystalline powder, soluble in water, insoluble in ethanol, and slightly soluble in ammonia. Weathering in the air. When heated to 100°C, it loses crystal water and becomes anhydrous. It reacts with strong acids (except hydrofluoric acid) to form water-insoluble yellow tungstic acid. It reacts with phosphoric acid or phosphate to form phosphotungstic heteropoly acid complex. It reacts with organic acids such as tartaric acid, citric acid, and oxalic acid to form corresponding organic acid complexes. compound.

Preparation

Tungsten trioxide reacts with sodium hydroxide, or tungsten concentrate and sodium hydroxide are pressure-cooked to generate a tungstic acid solution. After refining, filtration, ion exchange and other processes, the impurities are separated, and then evaporated and crystallized to obtain a tungstic acid product.

The uses of tungstic acid include the following aspects:

1. Tungstic acid is an important chemical raw material that can be used to manufacture metal tungsten, tungsten wire, tungstate, etc.

2. Due to the rich color of tungstic acid, it can be used as mordant, pigment, dye and ink.

3. Tungstic acid is used as a fabric weighting agent or fabric auxiliary in the textile industry. A mixture of tungstic acid, ammonium sulfate, ammonium phosphate, etc. can be used to make fibers fireproof and waterproof. This fiber can be used to make fireproof rayon and rayon. Can also be used for leather tanning.

4. Used for electroplating coating anti-corrosion.

5. Used as a co-solvent to introduce enamel color materials, which can reduce the firing temperature and complement the color.

6. Used in the petroleum industry and the manufacturing of aviation and aerospace materials.

• < Prev
• Next >