METHOD OF PROCESSING MONAZITE CONCENTRATE

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FIELD : technological processes. SUBSTANCE : invention relates to technology of extracting rare-earth elements from natural phosphorus-containing concentrates. Monazite concentrate is processed, heated with sulphuric acid with production of cake containing sulphates of rare-earth elements. Then one performs washing of cake in two stages, at first stage of treatment is carried out mother solution after separating precipitate of rare-earth elements obtained from aqueous solution with second stage washing. At first stage washing is carried out in countercurrent mode at T : G=1 : 2÷3 at second stage is washed with water at temperature of 5-20°C at T : G=1 : 6÷8. EFFECT : technical result consists in increase of content of REE in collective rare-earth concentrate, ensuring high degree of purification from thorium, phosphorus compounds, reducing consumption of reagents. 3 cl, 3 ex