PROCEDURE FOR DETERMINATION OF QUANTITATIVE CONTENTS OF VALUABLE METALS IN ROCK AND PILES OF METAL MINING PRODUCTION Russian patent published in 2011 - IPC G01N31/00 G01N33/20 

FIELD: metallurgy.

SUBSTANCE: procedure consists in acidic decomposition of sample, in separation, drying and melting non-soluble residue with sodium peroxide, in leaching melt produced after melting with 2H hydrochloric acid, in concentrating gold and elements of platinum group (PGE) from united solution of complex forming sorbent and in assay of suspension by method of atomic-absorption spectrometry. Also, acidic decomposition of the sample is performed with mixture of oxalic (2-3 wt %), concentrated sulphuric (10-12 wt %), phosphorus (9-11 wt %) and hydrofluoric (70-80 wt %) acids at ratio weight of sample and weight of acids from 1:5 to 1:10 which is heated to temperature 150°C during 1.5-2 ours at periodic mixing. Further, temperature is gradually raised to 300-350°C, residues of acids are evaporated to production of "wet salts" and produced residue is treated with concentrated sulphuric acid at ratio weight of sample to weight of acid from 1:1.5 to 1:3. Acid is repeatedly evaporated to production of "wet salts" avoiding over-drying produced non-soluble residue of the sample. The latter is successively treated with hydrochloric acid of 2H concentration at temperature as high, as 70°C and water at temperature not below 50°C to transparency of solution, where upon produced solution is centrifuged, supernatant liquid is removed from it, residue of rock sample is dried and burned by stepped heating to temperature 600°C. Produced concentrate of analysed sample of rock is assayed for presence of valuable metals in it.

EFFECT: upgraded accuracy and reliability, accelerated analysis.

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