METHOD OF PREPARING HIGH-DISPERSITY AND GRANULOMETRICALLY UNIFORM RARE-EARTH ELEMENT CARBONATES WITH PLATE OR DENDRITIC FORM Russian patent published in 2005 - IPC

FIELD: nonferrous metallurgy.

SUBSTANCE: invention relates to hydrometallurgy of rare-earth elements, in particular to technology of preparing of rare-earth element carbonates with controlled particular shape used in manufacture of polishing materials and catalysts. Suspension of rare-earth element carbonates prepared by mixing rare-earth element carbonate solution with carbonic acid solution is stirred at 20 to 75^оС at suspension motion velocity between 0.5 and 20 m/s, whereupon rare-earth element carbonates are precipitate in plate form at stirring for a period of time satisfying relationship 1.5*T^0.5 ≤ τ ≤ 30. Precipitation of dendritic carbonates is accomplished at stirring for a period of time satisfying relationship 10⁶*T^-2.5 ≤ τ ≤ 600, where τ are numeric values of stirring time, min, and T are numeric values of reaction medium temperature, ^оС.

EFFECT: extended temperature range for precipitation of plate- and dendritic-form rare-earth element carbonates and improved granulometric uniformity of product.

2 dwg, 2 ex