PROCESSING METHOD OF PLUMB-MICROLITIC CONCENTRATE Russian patent published in 2009 - IPC C22B13/00 C22B34/24 C22B3/06 

FIELD: metallurgy.

SUBSTANCE: concentrate is grinned up to size not more than 0.32 mm and treated by mixture 18-35% of nitrogenous and 40-45% hydrofluoric acids at mass correlation of acids 2.7-5.3:1, "Т:Ж"=1:3-5 and temeprature 90-120°C with formation of pulp. Nitro-acid lead (II), undecomposed minerals and radionuclides are transferred into sedimentation, and tantalum and niobium - into fluoride - nitro-acid solution. Pulp is cooled up to 10-20°C, lead-bearing deposit is separated and washed it by 35-50% nitric acid at "Т:Ж"=1:1.5-2.0. Scrub solution is affixed to fluoride - nitro-acid solution. From washed sediment it is leached nitro-acid lead (II) by water at correlation "Т:Ж"=1:5-10 and temperature 50-60°C with separation of undecomposed minerals and radionuclides and receiving of nitro-acid lead solution. From combined fluoride - nitro-acid solution it is implemented extraction of tantalum and niobium by neutral extragent. In the capacity of neutral extragent it is used triiso-amyl-phosphate or octanol-1. Extraction is implemented on 2-6 stages at O:B=1.5-2.0:1 with transferring of tantalum into organic phase and niobium - into aqueous. Extraction by triiso-amyl-phosphate is implemented at 2-4 stages, and extraction by octanol-1 - at 5-6 stages.

EFFECT: increasing of extraction ratio of tantalum and niobium into solution and reduction of operation amount at lead exudation in the form of well-soluted salt of nitro-acid lead.

8 cl, 5 ex