Ammonium metatungstate and ammonium secotungstate are significantly different in several aspects, and the following is a detailed comparison:
Definition of ammonium metatungstate and ammonium secotungstate
Definition of ammonium metatungstate
Ammonium metatungstate is an inorganic compound with the molecular formula HN₆OW (or (NH₄)₆W₁₂O₃₉-xH₂O, where x denotes the amount of crystalline water), which appears as a white crystalline powder or slightly yellow.
Definition of Ammonium paratungstate
Ammonium metatungstate is a chemical substance with the molecular formula (NH₄)₂W₂O₇-5H₂O, monoclinic system of fine transparent crystals or white crystals.
Physical and Chemical Properties of Ammonium Metatungstate and Ammonium Paratungstate
Physical and chemical properties of ammonium metatungstate
It has low solubility, but is easily decomposed by heat. It is water-soluble white crystalline powder or slightly yellow, soluble in water.
Physical and Chemical Properties of Ammonium paratungstate
The solubility is also low, but it is not easily decomposed by heat. It is soluble in water but insoluble in ethanol. The aqueous solution is weakly acidic.
Uses of Ammonium Metatungstate and Ammonium Paratungstate
Uses of Ammonium Metatungstate
It is used in the manufacture of metallic tungsten, alloy steel, fireproof fabrics, etc. and in the ceramic industry. It is also the main raw material for tungsten-based catalysts in oil refineries, and an important raw material for manufacturing various petrochemical catalysts and other tungsten compounds.
Uses of Ammonium paratungstate
It is mainly used in the manufacture of tungsten trioxide or blue tungsten oxide to make metallic tungsten powder, as well as in the petrochemical industry as additives. In addition, it is also used in the manufacture of ammonium metatungstate and other tungsten compounds.
Production Process of Ammonium Metatungstate and Ammonium Paratungstate
The production process of ammonium metatungstate includes solvent extraction or ion exchange method using ammonium tungstate solution as raw material, solvent extraction method using sodium tungstate solution as raw material, and thermal dissociation of ammonium paratungstate (APT) by heating.
The production process of ammonium paratungstate, on the other hand, depends on the type of tungsten concentrate and the impurity composition contained therein, including various methods such as high pressure alkali boiling of wolfram concentrate – ion exchange – evaporation and crystallization method, soda pressure boiling of scheelite concentrate – ion exchange – evaporation and crystallization method, and so on.
Stability of ammonium metatungstate and ammonium secotungstate
Ammonium metatungstate is easily decomposed by heat. Ammonium paratungstate, on the other hand, has relatively good thermal stability, but it will lose part of ammonia and water of crystallization at high temperature, and eventually transform into tungsten trioxide.
There are obvious differences between ammonium metatungstate and ammonium secotungstate in terms of definition, physical and chemical properties, use and production process, etc. These differences make them play different roles in different industrial fields and applications.
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