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- W1985380193 abstract "Kola eudialithe concentrates contain 7-10% ZrO2, about 2% rare earth metals, and 0·5-0·7% Nb2O3, and about 50% SiO2. The rare earth fraction contains 40% of yttrium group metals including 20% of yttrium. Eudialithe is easily dissolved in acids but silica precipitates in colloidal nonfilterable form and carries away up to 40% of Zr content. In sulphuric acid leaching there is additional problem of coprecipitation of sodium-lanthanides sulphates. Solutions to these problems were proposed by adding fluoride ions to sulphuric acid: •Output of zirconium to solution grew up to 95%. •The rate of filtration of silica increased 100 times, the precipitate became granular and white. •It became possible to separate heavy, quickly sedimenting double Na-Ln sulphates from light suspension of silica. The heavy precipitate contains Na-Ln sulphates, monazite (LnPO4 + ThSiO4), and Na-Fe silicate eguirine. Lanthanides are dissolved by alkali or Ca-Ba-Al nitrates mixtures solutions. Then they are treated with nitric acid and any of 15 rare earth metals can be separated by well-known methods. The residue contains Nb, Ti, Mg, Ca, Fe, Si admixtures. The zirconium sulphate acid solution is extracted with quarternary ammonium base organic solutions. Fluoride ion addition into Zr-containing organic phase increases extraction coefficients 2−3 times. The high quality silica precipitate can be used in rubber, plastics or silica gel production. After reextraction by weak HC1 solutions we obtain pure ZrO2 product. A scheme is proposed based on the use of standard industrial equipment and technologies." @default.
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- W1985380193 date "1995-12-01" @default.
- W1985380193 modified "2023-09-27" @default.
- W1985380193 title "Processing Technology of Eudialithe Concentrates" @default.
- W1985380193 doi "https://doi.org/10.1080/08827509508914165" @default.
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