SU1428695A1 - Method of producing sodium fluoride - Google Patents

Abstract

This invention relates to inorganic chemistry, namely to a method for producing sodium fluoride. The goal is to increase the yield of the product. It is proposed to contact fluorinated gases at 12-30 ° C with a soda solution with a concentration of 110-190 g / l with the introduction of solid soda into the foam layer. 3 tab.

Description

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This invention relates to inorganic chemistry, namely to a method for producing sodium fluoride. A: The purpose of the invention is to increase the yield of the product.

Example. Fluorine-containing gases.

12 C requires additional energy costs for cooling the solution.

The data obtained show that with a decrease in the concentration of soda solution to 100 g / l, the yield decreases.

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containing 49.6 g / nm water fluoride-NaF and sodium fluoride content in bark and 1.4 g / nm home fluorofluoride product. With an increase in the concentration of hydrogen, the solution is fed to the mass transfer of solution above 200 g / l with an increase in productivity of 500 nm / h. Gas temperature 25-35 C.

When the soda solution is saturated with sodium fluoride, dry soda is continuously injected into the foam layer in an amount of 25 kg / h. Dry soda reacts with a solution and gas component to form sodium fluoride, which precipitates due to saturation of the solution with NaF.

The spent solution is then supplied through the foaming lattice openings to the bunker part of the mass transfer apparatus, where the precipitation of sodium fluoride occurs. Periodically, sodium fluoride in the form of a paste is removed from the bunker part of the apparatus for pressing or filtering, and then drying.

Tables 1 and 2 show the results of the implementation of the proposed method at various concentrations of soda solution.

As can be seen from Table 1, as the temperature of the solution increases above 30 ° C, the yield of NaF and the content of sodium fluoride in the dry product decrease. Conducting the process at a temperature below

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The content of soda is in the finished product, which reduces the content of sodium fluoride and reduces the yield of the target product.

Table 3 presents comparative data on the yield and quality of the product obtained according to the proposed and known methods.

The proposed method allows to increase the product yield with an increase in the content of the main substance.

Claims (2)

1. A method of producing sodium fluoride, which includes contacting fluorine-containing gases with a soda solution in the foam layer, characterized by 30 u and so that, in order to increase the yield, the process is carried out at a concentration of soda solution of 110-190 g / l, which is supported by the continuous introduction of solid soda into the foam layer. 2. The method according to claim 1, which differs from the topic that the process is conducted at 12-30 s. . . 35 12 C requires additional energy costs for cooling the solution. The data obtained show that with a decrease in the concentration of soda solution to 100 g / l, the yield decreases. NaF and sodium fluoride content in the dry product. With an increase in the concentration of the solution above 200 g / l NaF and sodium fluoride content in the dry product. With an increase in the concentration of the solution above 200 g / l The content of soda is in the finished product, which reduces the content of sodium fluoride and reduces the yield of the target product. Table 3 presents comparative data on the yield and quality of the product obtained according to the proposed and known methods. The proposed method allows to increase the product yield with an increase in the content of the main substance. V - Claims of invention 1. A method of producing sodium fluoride, which includes contacting fluorine-containing gases with a soda solution in the foam layer, characterized by In order to increase the yield, the process is carried out at a concentration of soda solution of 110-190 g / l, which is supported by the continuous introduction of solid soda into the foam layer. 2. The method according to claim 1, which differs from the topic that the process is conducted at 12-30 s. . . 1 2 3 4 Table 1 table 2