METHOD OF PROCESSING OF IRON-CONTAINING MONAZITE CONCENTRATES

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FIELD : chemistry. SUBSTANCE : method includes processing of concentrate with diluted hydrochloric acid with obtaining hydrochloric acid solutions FeCl2 and LnCl3. Then, decomposition of residue and obtaining of solution, which contains rare-earth metals, are carried out. Before processing with diluted hydrochloric acid monazite concentrate is subjected to reduction at 350-400°C with carbon monoxide (CO). Processing of reduced concentrate is carried out with diluted hydrochloric acid for 15-60 minutes at room temperature. Decomposition of de-ironed concentrate is realised by fluoridation with hydrofluoric acid, or ammonium hydrofluoride, or their mixture, or by sulphatisation of concentrated H2SO4, or by processing with concentrated NaOH solution. EFFECT : realisation of possibility to carry out processing of monazite concentrates and low concentrations of hydrochloric acid at low temperatures for a short time. 4 cl, 1 dwg, 2 tbl, 3 ex