| 简介 |
FIELD : chemistry.
SUBSTANCE : invention can be used to produce compounds of zirconium, rare-earth elements (REE) and silicon dioxide. The method comprises decomposing the concentrate with sulfuric acid, separating the residue from the zirconium-containing solution, washing it with water, isolating zirconium from the solution, and recovering the REE from the silica-containing residue. The decomposition of the concentrate is carried out with 30-40% sulfuric acid at a temperature of 80-120°C and acid consumption of 125-200% with respect to stoichiometry. Extraction of REE is carried out by washing the residue in two stages. At the first stage, the water flow is 2.5-3.5 l per 1 kg of the concentrate with washing of the remainder of the zirconium-containing solution. Resulting wash water is mixed with a zirconium-containing solution. At the second stage, the water flow is 10-20 l per 1 kg of the concentrate with transfer to the wash solution of sulfates of REE, after which silica is extracted from the silica-containing residue.
EFFECT : providing a high rate of pulp filtration with a reduction in the number of reagents and a reduction in the amount of solid waste.
7 cl, 7 ex |
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