In the manufacturing process of cut-resistant tungsten wire, chemical treatment methods play an important role, mainly used for the purification of raw materials, the preparation of intermediate products and the treatment of final products. The following are some key chemical treatment methods:
- Raw material purification
Solvent extraction method:
Principle: Solvent extraction method uses the difference in solubility between tungsten and other impurity elements in a specific solvent to separate tungsten from the raw material solution through an extractant.
Application: In tungsten metallurgy, solvent extraction is often used to extract high-purity tungsten from tungstate solution. For example, using organic amine as an extractant, APT (ammonium paratungstate) is obtained by ammonia stripping in the medium, and then further processed to obtain high-purity tungsten powder.
Ion exchange method:
Principle: The ion exchange method uses the selective adsorption of tungsten ions by specific functional groups on ion exchange resins to achieve the separation of tungsten from other impurities.
Application: When treating tungsten-containing solutions, ion exchange resins can be used to remove impurity ions in the solution to improve the purity of tungsten.
- Preparation of intermediate products
Oxidation reaction:
Process: In the process of preparing tungsten wire, it is necessary to oxidize tungsten compounds into higher valence oxides, such as roasting ammonium paratungstate at high temperature to obtain blue crystalline tungsten oxide.
Function: Oxidation reaction helps to remove impurities in the raw materials and provide suitable oxide forms for subsequent reduction reactions.
Reduction reaction:
Process: Hydrogen reduction is usually used to reduce tungsten oxide to tungsten powder. At high temperature, hydrogen reacts with tungsten oxide to generate tungsten powder and water vapor.
Function: Reduction reaction is a key step in the preparation of high-purity tungsten powder. Through reduction reaction, tungsten powder with high purity and uniform particle size can be obtained, providing high-quality raw materials for subsequent tungsten wire drawing.
- Final product processing
Pickling treatment:
Process: After the tungsten wire is drawn, pickling treatment may be required to remove oxides and impurities on the surface. Commonly used acids include hydrochloric acid, sulfuric acid, etc.
Function: Pickling treatment can improve the surface finish and purity of tungsten wire, reduce resistance during cutting, and thus improve the cutting resistance of tungsten wire.
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