| 简介 |
FIELD : chemistry.SUBSTANCE : invention relates to chemical industry, particularly, to extraction of rare-earth elements from phosphogypsum. Method for extraction of rare-earth elements from phosphogypsum includes preparation of pulp from ground pre-enriched phosphogypsum at ratio of weight of phosphogypsum to volume of water equal to 1 : (1.8–3.0) and sorption of rare-earth elements, which is carried out using gel strong-acid sulphocationite in H-form at ratio of weight of ionite to weight of phosphogypsum equal to 1 : (1–3) at two stages at time of phases contact at stage of 3.5–4.0 hours.EFFECT : invention provides higher degree of extraction of rare-earth elements at stage of sorption leaching to 85–90 %, reduced consumption of sulfuric acid and ionite, simplified process of processing phosphogypsum with production of concentrate of rare-earth elements and gypsum binder as a whole.3 cl, 3 ex |
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