METHOD OF BRAZILITE CONCENTRATE EXTRACTION Russian patent published in 2009 - IPC C01G25/02 B03B7/00 B03B1/02 C22B3/06 

FIELD: chemistry.

SUBSTANCE: invention refers to brazilite concentrate technology from zirconium waste with simultaneous liberation of rare-metal concentrate. Invention refers to method of brazilite concentrate extraction. Herewith raw materials are magnetic finish fraction of brazilite concentrate. Magnetic fraction is processed with 7-10% hydrochloric acid or 10-30% sulphuric acid at 60-90°C. Brazilite deposition is separated, washed, dried and followed with two-phase magnetic separation. The first stage includes magnetic separation in magnetic field of average intensity equal to 10000-14000 E and liberation of crude brazilite concentrate and average-magnetic delivered to spoil bank. The second stage includes separation of crude brazilite concentrate in high-intensity magnetic field 20000-24000 E and liberation of base of brazilite concentrate and low-magnetic fraction processed in high-temperature sulphuric acid medium. Low-magnetic fraction is processed with 85-93% sulphuric acid at 200-250°C in mass relation S:L=1:0.4-0.6. Produced sulphatisation product is pulped in water with derived pulp from which residue of brazilite concentrate is separated and sulphate suspension containing rare elements is produced.

EFFECT: higher efficiency of brazilite concentrate extraction and for extended zirconium raw-material base.

3 cl, 4 ex