The principle of tungsten nitrate precipitation can be described in points as follows:
Redox reaction
During the process of tungsten nitrate precipitation, the solution obtained by extracting tungsten ore (the solution obtained by filtering the tungsten slurry suspension to remove sand particles) is first mixed with excess nitric acid.
The nitrate ions (NO₃⁻) in the nitric acid undergo a redox reaction with the tungsten element (W) in the solution. This reaction causes the tungsten element to be converted from the solution to its oxide form.
Formation of tungsten oxide
In the redox reaction, the tungsten element undergoes a valence change and eventually forms tungsten oxides. These oxides are usually present in the solution in the form of tiny particles.
Precipitation formation
As tungsten oxides are formed in the solution, these tiny particles gradually aggregate and precipitate out. This process can be optimized by controlling the reaction conditions (such as temperature, stirring speed, reaction time, etc.).
Formation of tungsten nitrate, the precursor of ammonium metatungstate
The precipitated material is mainly composed of tungsten oxides, which are the precursors of tungsten nitrate (i.e., the precursor of ammonium metatungstate).
Further treatment of tungsten nitrate
After tungsten nitrate is precipitated, further treatment (such as washing, drying, etc.) can be performed to obtain purer tungsten nitrate.
Addition of ammonia water
After obtaining tungsten nitrate, it can be placed in ammonia water. Under appropriate temperature conditions, ammonia water is added to hydrolyze the tungsten nitrate to form ammonia and metatungstic acid.
After precipitation, ammonium metatungstate can be obtained.
The process of tungsten nitrate precipitation mainly involves the redox reaction of tungsten element, the formation of tungsten oxide, the formation of precipitation, the formation of tungsten nitrate, and the subsequent addition of ammonia water and hydrolysis reaction. The key to this process is to optimize the formation and precipitation process of tungsten oxide by controlling the reaction conditions, so as to obtain pure tungsten nitrate and finally prepare ammonium metatungstate.
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