RU1798307C - Method of erbium hydrosilicate producing - Google Patents

Abstract

Usage: inorganic chemistry, production of erbium hydrosilicate for phosphors and optical glasses. SUMMARY OF THE INVENTION: The sodium silicate solution is heated to boiling, cooled to room temperature. Heating and cooling are repeated 2-4 times. During the last heating, a solution of sodium silicate is mixed with a solution of erbium salt in a molar ratio of erbium salt to sodium silicate of 0.66-1. The mixture is allowed to stand. The precipitate was separated from the solution. The yield of erbium hydrosilicate is 97%. 2 tab.

Description

The invention relates to inorganic chemistry, and more particularly, to a process for the preparation of erbium hydrosilicate used in the phosphor industry as well as in the optical glass industry.

The purpose of the invention is to speed up the process and increase product yield.

The method is carried out as follows.

In order to obtain erbium hydrosilicate, stock solutions of erbium salt and sodium silicate are first prepared.

In the case of the presence of sodium metesilicate, disilicate and trisilicate in the dry state, they are dissolved by alternating techniques of heating to boiling point and cooling to ambient temperature. Otherwise, to prepare a solution of sodium di-, trisilicates with a silicate module 2,3, the calculated amount of grade X sodium metasilicate. including mixed with amorphous silica brand x. hours and dissolved in water.

To completely dissolve the mixture in water, the solution is alternated by heating the solution to boiling point and cooling to ambient temperature, accompanied by constant stirring.

Erby hydrosilicate in the form of a precipitate is obtained by mixing the prepared aqueous solutions of the components with a molar ratio of 0.66-0.9 and shaking. It is then held from one hour to one day until equilibrium is reached in the liquid phase - precipitate system, after which the precipitate is separated by centrifugation, washed and dried.

Specific examples of the proposed method and control examples for substantiating technological methods are given in table 1.

The advantages of the proposed method in comparison with the known are given in table.2.

As can be seen from the table. 1 and 2, without using heating of the starting components during the dissolution process, we do not arrive at

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the study of a positive effect (low product yield).

Claims (1)

The time for preparing the stock solutions for the production of erbium hydrosilicate according to the prior art is 25 days. SUMMARY OF THE INVENTION A method for the preparation of erbium hydrosilicate, comprising mixing solutions of erbium salt and sodium silicate in a molar ratio (0.66 - 1.0): 1, holding the mixture 0 and separating the erbium hydrosilicate precipitate from the solution, characterized in that, in order to accelerate the process and increase the yield of the product, before mixing the sodium silicate solution is subjected to 2 to 4 times heating to the boiling point, while the erbium salt solution is fed to the mixing in the last heating stage and after each heating step, the solution is cooled to ambient temperature. Table 1 Continuation of the table. 1 Continuation of the table. 1 table 2