METHOD OF PROCESSING BRANNERITE-CONTAINING REFRACTORY URANIUM ORES Russian patent published in 2015 - IPC C22B60/02 C22B11/00 C22B3/08 

FIELD: chemistry.

SUBSTANCE: milled to the coarseness of minus 0.3 mm ore is processed with a 1-40% solution of ammonium bifluoride with a ratio S:L=1:(1-5) and a temperature of 50-80°C for 1-4 hours. The obtained pulp is filtered, after which the filtrate is passed through waterless ammonia at a temperature of 25-60°C to pH 10. Then, the ammonium bifluoride solution is separated from the formed pulp, its concentration is increased to 1-40%, and supplied to re-processing of an initial raw material. The separated sediment is supplied to uranium extraction. Cakes, obtained as a result of the ore activation by solutions of ammonium bifluoride, are processed for 2-12 hours with a leaching solution with a ratio S:L=1:1, temperature of 60-80°C and residual acidity not lower than 20 g/l. The leaching solution represents a solution of sulphuric acid with the concentration 150-300 g/l, in which nitric acid is introduced as an oxidant, as well as NaCl as a complex forming reagent for gold.

EFFECT: reduction of the prime cost of the product due to the simplification of the technological process with the preservation of a degree of the uranium extraction, increased degree of the extraction of noble metals, reduction of fire hazard of the production and simplification of technological equipment construction.

12 cl, 1 dwg, 7 tbl, 6 ex