| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: apatite concentrate is decomposed with nitric acid to obtain nitrate-phosphate solution. Calcium nitrate and sodium fluosilicate are successively extracted from the solution. The solution is neutralised with ammonia to form a precipitate of phosphates of the main part of lanthanides and a mother solution with the residual part of lanthanides. The mother solution is treated by bringing it into contact with an amorphous titanium phosphate-based sorbent at pH of the solution equal to 1.4-1.7 with concentration of the residual part of lanthanides in the sorbent. The lanthanide-rich sorbent is separated, washed with water and treated with 0.5-3.0 M mineral acid with desorption of lanthanides. The amorphous sorbent used is one of the sorbents with the following composition: TiOHPO4nH2O, (Ti1-xZrx)OHPO4nH2O, TiONH4PO4nH2O, (Ti1-xZrx)ONH4PO4nH2O, where nëÑ1, x=0.05-0.5. ^ EFFECT: high degree of extraction of lanthanides from apatite concentrate. ^ 3 cl, 6 ex, 6 tbl |
