RU2234461C2 - Method of preparing melt containing potassium chloro-zircon ate and fluoride of rare-earth elements - Google Patents

Abstract

FIELD: metallurgy of rare-earth metals; production of melts of salts of potassium chloro-zircon ate used for electrolytic and metal-thermal production of zirconium.

SUBSTANCE: proposed method includes introducing potassium and sodium chlorides into melt. For obtaining melt containing fluorides of rare-earth elements, potassium fluoro-zirconate is introduced into melt in zirconium compound and anhydrous chloride of rare-earth elements is introduced at temperature of 680-700 C for exchange reaction between potassium fluoro-zirconate and chlorides of rare-earth element.

EFFECT: increased degree of extraction of zirconium and rare-earth elements.

2 ex

Description

The invention relates to the metallurgy of rare metals, in particular to the field of producing molten salts of chlorinated zirconate, potassium chlorofafnate and rare earth metal fluoride - starting materials for producing alloys and Mg-Zr-REM alloys.

A known method of producing a melt of potassium chlorocirconate or potassium chlorogaphnate, including passing vapors of zirconium tetrachloride and hafnium through molten alkali metal chlorides [1]. The process is carried out at a temperature of 700 ° C. The degree of assimilation of metals does not exceed 82% due to the strong volatility of metal tetrachlorides at this temperature.

The disadvantage of this method is the loss of zirconium and hafnium with sublimates of chlorides.

This invention is aimed at obtaining a technical result - increasing the degree of extraction of zirconium, rare earth elements into the melt and conducting an exchange reaction to produce potassium chlorocirconate and rare earth fluorides by reaction

K ₂ ZrF ₆ + 2РЗМСl ₃ = K ₂ ZrCl ₆ + 2РЗМF ₃ .

Such a melt allows the reduction of zirconium and rare earth metals with magnesium together.

The technical result is achieved in that a method for producing a melt containing potassium chlorozirconate, comprising introducing a zirconium compound into a melt of potassium and sodium chlorides, according to the invention, to obtain a melt containing additional rare earth fluorides as a zirconium compound, potassium fluorozirconate is introduced into the melt and at a temperature of 680 -700 ° C, anhydrous rare earth chloride is introduced for the exchange reaction between potassium fluorozirconate and rare earth chlorides.

Melting 1

The melt was prepared as follows: 50 kg of potassium fluorozirconate was introduced into the melt of potassium and sodium chlorides at a temperature of 680 ° C; after 20 minutes stirring at a temperature of 680 ° C, 50 kg of anhydrous rare-earth chlorides were introduced to undergo an exchange reaction

K ₂ ZrFe + 2РЗМСl ₃ = K ₂ ZrCl ₆ + 2РЗМF ₃ .

After 20 minutes of stirring, a melt of the following composition was obtained,%:

ΣРЗМF ₃ 34

K ₂ ZrCl ₆ 57.4

Chlorides K, Na 8.6

Melting 2

The melt was prepared as follows: 40 kg of potassium fluorozirconate was introduced into the melt of potassium and sodium chlorides at a temperature of 700 ° C; after 30 minutes stirring at a temperature of 700 ° C, 60 kg of anhydrous rare earth chlorides were introduced to undergo an exchange reaction

K ₂ ZrF ₆ + 2РЗМСl ₃ = K ₂ ZrСl ₆ + 2РЗМF ₃ .

After 30 minutes of stirring, a melt of the following composition was obtained,%:

ΣРЗМF ₃ 43

K ₂ ZrCl ₆ 48.2

Chlorides K, Na 8.8

Literature

1. Metallurgy of zirconium and hafnium. / Ed. L.G. Nekhamkina. - M.: Metallurgy, 1979.

Claims (1)

A method of producing a melt containing potassium chlorozirconate, comprising introducing a zirconium compound into a potassium and sodium chloride melt, characterized in that to obtain a melt containing additional rare earth fluorides, potassium fluorozirconate is introduced into the melt at a temperature of 680-700 ° C. anhydrous rare earth chloride is introduced for the exchange reaction between potassium fluorozirconate and rare earth chlorides.