METHOD FOR REPROCESSING OF METAL SULFIDE-CONTAINING PRODUCTS Russian patent published in 2005 - IPC

FIELD: hydrometallurgy of non-iron, rare and noble metals.

SUBSTANCE: invention relates to reprocessing of metal sulfide-containing ores, products and waste of ore concentrating and metallurgy industry. Method includes leaching in sulfuric acid solution with concentration of 1.8-35 g/dm³ at 0-150⁰C in presence of iron(III) ions with concentration more than 1 g/dm³ and iron regeneration using element compounds having built-in voltage when transition from highest valence to lowest one higher the same of iron. Compounds are added into solution when increasing iron(II) ion concentration. Method is useful in leaching by bawl, percolation, heap, and underground processes, as well as in metal recovering into solution, development of rare and noble metals, impregnated in metal sulfides. Invention affords the ability to reduce power requirement, increase effectiveness of equipment utilization, and decrease reagent consumption.

EFFECT: high degree sulfide decomposition with increased metal recovery and reduced leaching time.

8 cl, 3 ex