METHOD FOR COAL CONVERSION Russian patent published in 2008 - IPC C01G1/00 C22B34/34 C22B58/00 C22B41/00 C22B17/00 

FIELD: mining.

SUBSTANCE: coal hydrogenization takes place in the presence of a catalyst comprising a molybdenum compound as a transition metal. Products of the coal hydrogenization are separated into liquid fractions and a solid residue that contains said transition metal. Sludge from the coal hydrogenization is mixed up with limestone and low-grade coal, and then incinerated. The liquid fractions are distilled and disposed of. Fly ash formed from burning the solid residue is collected and treated with a mixture of ammonia and ammonium carbonate. An obtained suspension is filtered and molybdenum compounds are extracted thereof in the form of an aqueous solution that is reused as a component of the catalyst for the coal hydrogenization. A solid residue from the suspension filtration comprising trace rare elements is treated with hydrochloric acid while being heated and then said trace rare elements are extracted thereof by a solution of three-n-butyl phosphate in kerosene oil.

EFFECT: invention allows combining the process of catalyst reactivation with the extraction of trace rare elements.

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