Process for producing ammonium polythiomolybdate

Details Process for producing ammonium polythiomolybdate Process for producing ammonium polythiomolybdate

C - Chemistry, Metallurgy

01

G

C01G 39/00 (2006.01)

Patent

CA 2543532

There is disclosed a process for producing an ammonium polythiomolybdate of the formula (NH4)2MO3S13.nH2O where n is 0, 1 or 2 comprising reacting an aqueous ammoniacal molybdate solution with hydrogen sulfide gas at superatmospheric pressure until the H2S is no longer absorbed by the solution, said solution and said gas being in a closed system and the flow of said gas being regulated at an elevated pressure, to form a slurry consisting essentially of a solid essentially all of which is ammonium tetrathiomolybdate, and thereafter heat soaking the reaction product at elevated temperature in the presence of elemental sulfur to form the desired product.

L'invention concerne un procédé permettant de produire un polythiomolybdate d'ammonium représenté par la formule (NH<SUB>4</SUB>)<SUB>2</SUB>MO<SUB>3</SUB>S<SUB>13</SUB>.nH<SUB>2</SUB>O, dans laquelle n vaut 0, 1 ou 2. Ce procédé consiste à faire réagir une solution aqueuse de molybdate ammoniacal avec du sulfure d'hydrogène gazeux à une pression superatmosphérique jusqu'à ce que H<SUB>2</SUB>S ne soit plus absorbé par la solution, cette solution et ce gaz étant dans un système fermé et le flux de ce gaz étant régulé à une pression élevée, afin de former une suspension boueuse constituée sensiblement d'un solide qui est sensiblement tout entier du tétrathiomolybdate d'ammonium. Ce procédé consiste ensuite à chauffer le produit de réaction à une température élevée en présence d'un soufre élémentaire afin de former le produit voulu.

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