Ammonium Tetrathiotungstate

Ammonium tetrathiotungstate, also known as ammonium thiotungstate and ammonium tetrathiot, it is a bright orange crystals with a metallic luster. The physical properties of ammonium tetrathiotungstate as follows: chemical formula: H8N2S4W, molecular weight: 348.18, density 2.71. Related System Number as follows: CAS registry number: 13862-78-7, MDL registry number: MFCD00061410, PubChem registry number: 24860418. Ammonium tetrathiotungstate has some harm to the environment, so during the operation can not be discharged it directly into lakes and rivers or sewer.
Making ammonium tungstate and tungstate to react to generate ammonium tetrathiotungstate and the producing process are as follows:
1. The ammonium tungstate by ammonia dissolved.
2.And then reaction with ammonium sulfide solution, the molar ratio S / W = 4-6：1, the reaction temperature: room temperature to 90 ℃, reaction time: 0.5 to 3 hours, static crystallization time: 8to24 hours.
3. Finally, the crystals were filtered, washed with water and washed with percutaneous ethanol, and finally dried to obtain ammonium tetrathiotungstate.

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