Method for producing molybdenum trioxide (MOO.sub.3) from raw materials that contain MOS.sub.2
First Claim
1. A method of producing molybdenum trioxide from raw materials containing molybdenum disulfide comprising the steps of:
- melting raw materials containing molybdenum disulfide in an oxidizing atmosphere and volatilizing 50% to 90% of said molybdenum disulfide to generate an exhaust gas containing MoO3 with a remainder of the molybdenum bonded in a molten slag as MoO4 ;
volatilizing the MoO4 in said molten slag by converting the MoO4 to volatile MoO3 while directing an oxidizing gas onto the molten slag at a pressure in the range of pO2 =0.05 through 0.5 atm. thereby preventing the formation of MoO2 and substantially depleting said molten slag of molybdenum with admixtures including at least Fe and Cu remaining in the slag;
uniting said exhaust gas with said volatile MoO3 to form a united gas;
and cooling said united gas and condensing molybdenum trioxide from said united gas into solid form.
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Abstract
A method and apparatus for producing molybdenum trioxide from raw materials containing molybdenum disulfide including melting the raw materials in an oxidizing atmosphere volatilizing a major portion of the raw materials as molybdenum trioxide with the remainder bonded in a molten slag as MoO4 and directing an oxidizing gas onto the molten slag to convert the MoO4 to molybdenum trioxide with the volatilization gas and the gas from the slag being united, the gas cooled and the molybdenum trioxide condensed from the gas into solid form (undesirable admixtures are separated from molybdenum trioxide raw oxides hydrometallurgically).
12 Citations
6 Claims
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1. A method of producing molybdenum trioxide from raw materials containing molybdenum disulfide comprising the steps of:
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melting raw materials containing molybdenum disulfide in an oxidizing atmosphere and volatilizing 50% to 90% of said molybdenum disulfide to generate an exhaust gas containing MoO3 with a remainder of the molybdenum bonded in a molten slag as MoO4 ; volatilizing the MoO4 in said molten slag by converting the MoO4 to volatile MoO3 while directing an oxidizing gas onto the molten slag at a pressure in the range of pO2 =0.05 through 0.5 atm. thereby preventing the formation of MoO2 and substantially depleting said molten slag of molybdenum with admixtures including at least Fe and Cu remaining in the slag; uniting said exhaust gas with said volatile MoO3 to form a united gas; and cooling said united gas and condensing molybdenum trioxide from said united gas into solid form. - View Dependent Claims (2, 3, 4, 5)
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6. A method of producing molybdenum trioxide from raw materials containing molybdenum disulfide comprising the steps:
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melting raw materials containing molybdenum disulfide in an oxidizing atmosphere and volatilizing an amount of molybdenum disulfide to generate an exhaust gas containing molybdenum trioxide with a remainder of the molybdenum bonded in a molten slag as MoO4 with the melted materials; volatilizing the MoO4 in said molten slag by converting the MoO4 to volatile molybdenum trioxide while directing an oxidizing gas onto the surface of the molten slag at a pressure in the range of pO2 0.05 through 0.05 atm. thereby preventing the formation of molybdenum dioxide and substantially depleting said molten slag of molybdenum with admixtures including at least Fe and Cu remaining in the slag; uniting said exhaust gas with said volatile molybdenum trioxide to form a united gas; cooling the united gas and condensing the molybdenum trioxide from the united gas into solid form; and withdrawing the slag containing said undesirable admixture including Fe and Cu.
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Specification