| 简介 |
FIELD : chemistry.SUBSTANCE : invention can be applied in hydrometallurgy of rare, diffused and radioactive elements in cases, when purification of solutions from silicon compounds is required, for preliminary preparation of initial raw material or solutions for recycling of elements. To realise the method specified excess quantity of nitric acid is supported in solution, solution is kept until silicic acid gel is formed, and precipitated gel is separated from solution. Excess content of nitric acid is supported within the interval of values 1.0-2.5 mole/l. Powder substance poorly soluble in nitric acid with particle diameter not more than 0.06 mm is added into solution with silicic acid gel. Sediment, which contains gel and powder substance, is washed and washing solution is directed for recycling. Washed sediment is processed with sodium solution hydroxide and obtained powder substance is re-applied for preparation of siliceous solutions for recycling. In preferable version of the method powder substance is added into solution with silicic acid gel in quantity, which provides total surface of particles not less than 0.3 m2 per 1 g SiO2.EFFECT : method ensures reduction of silicon concentration in solutions, which are supplied for recycling, obtaining more concentrated with respect to valuable component solutions with simultaneous elimination of silicon negative influence on separation of insoluble sediment.3 cl, 2 dwg, 3 ex |
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