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A method for preparing high-purity sodium fluorotitanate

A technology of pure sodium fluorotitanate and sodium fluorotitanate, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., can solve the problem of high price of sodium fluorotitanate, different quality of sodium fluorotitanate, and harsh production process and other issues, to achieve the effect of reducing the difficulty of process implementation, good product index stability, and improving the applicability of industrialization

Active Publication Date: 2021-04-16
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the high cost of raw materials for sodium fluorotitanate, the relatively harsh production process, and the cumbersome control of impurity elements, the quality of sodium fluorotitanate in the domestic market is different, and the price gap is obvious. The price of high-purity and high-quality sodium fluorotitanate higher

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  • A method for preparing high-purity sodium fluorotitanate

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Embodiment 1

[0036]This embodiment provides a method for preparing high-purity sodium fluorotitanate, the method comprising the following steps:

[0037] (1) Add hydrofluoric acid to metatitanic acid, control the molar ratio of fluorine and titanium to 6:1, stir and react at 30-40°C for 20 minutes, and obtain fluorotitanic acid solution after solid-liquid separation;

[0038] (2) adding concentration to the fluorotitanic acid solution obtained in step (1) is 20wt% NaOH solution, controlling the mol ratio of NaOH and silicon in the solution to be 1.2:1, stirring for 3h, solid-liquid separation after completion of the reaction, Obtain a fluorotitanic acid purification solution with a silicon element concentration of <100mg / L and an iron element concentration of <50mg / L;

[0039] (3) Adding a NaOH solution with a concentration of 20 wt% to the fluorotitanic acid purification solution obtained in step (2), controlling the mol ratio of NaOH and titanium in the mixed solution to be 1.3:1, stirri...

Embodiment 2

[0042] This embodiment provides a method for preparing high-purity sodium fluorotitanate, the method comprising the following steps:

[0043] (1) Add hydrofluoric acid to metatitanic acid, control the molar ratio of fluorine and titanium to 6.5:1, stir and react at 30-40°C for 30 minutes, and obtain fluorotitanic acid solution after solid-liquid separation;

[0044] (2) adding concentration to the fluorotitanic acid solution obtained in step (1) is 30wt% NaOH solution, controlling the mol ratio of NaOH and silicon in the solution to be 1.5:1, stirring for 5h, solid-liquid separation after completion of the reaction, Obtain a fluorotitanic acid purification solution with a silicon element concentration of <100mg / L and an iron element concentration of <50mg / L;

[0045] (3) Adding a NaOH solution with a concentration of 30wt% to the fluorotitanic acid purification solution obtained in step (2), controlling the mol ratio of NaOH and titanium in the mixed solution to be 1.8:1, stir...

Embodiment 3

[0048] This embodiment provides a method for preparing high-purity sodium fluorotitanate, the method comprising the following steps:

[0049] (1) Add a NaOH solution with a concentration of 10wt% to the fluorotitanic acid solution, control the molar ratio of NaOH and silicon in the solution to 1.1:1, stir and react for 6 hours, and separate the solid and liquid after the reaction is completed to obtain a silicon element concentration < 100mg / L, fluorotitanic acid purification solution with iron concentration <50mg / L;

[0050] (2) Adding a NaOH solution with a concentration of 15wt% to the fluorotitanic acid purification solution obtained in step (1), controlling the mol ratio of NaOH and titanium in the mixed solution to be 1.6:1, stirring the mixed solution for 4 hours, and the reaction is completed After solid-liquid separation, sodium fluorotitanate crystals are obtained, and the obtained sodium fluorotitanate crystals are dried at 110° C. for more than 2 hours to obtain s...

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Abstract

The invention relates to a method for preparing high-purity sodium fluorotitanate. The method comprises: adding NaOH solution to the fluorotitanic acid solution, controlling the molar ratio of NaOH to silicon in the solution to be (1.1-1.8):1, and stirring Reaction, solid-liquid separation after the reaction is completed, to obtain a fluotitanic acid purification solution; adding NaOH solution to the obtained fluotitanic acid purification solution, stirring the mixed solution to react, and solid-liquid separation after the reaction to obtain sodium fluotitanate. The present invention prepares high-purity sodium fluorotitanate products with silicon content <0.03%, iron content <0.01%, chromium, manganese and other main impurities content <0.002%, purity ≥ 99.5%, and good product index stability through the above method , which can meet the raw material demand of downstream metal titanium or titanium alloy production. The invention simultaneously simplifies the preparation process of the sodium fluorotitanate, reduces the difficulty of process implementation, improves industrial applicability, and has good application prospects.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for preparing high-purity sodium fluorotitanate. Background technique [0002] The molecular formula of sodium fluorotitanate is Na 2 TiF 6 In industry, it is mainly used as a catalyst for the synthesis of polypropylene, as an insecticide in the kiln industry, as a metal welding agent, and as a raw material for the production of metal titanium. The international sodium fluorotitanate market is developing rapidly. The United States has the largest demand, followed by European countries. Emerging markets such as Russia have also set off an upsurge in demand for sodium fluorotitanate. Driven by countries such as Europe and the United States, the market capacity of sodium fluotitanate is increasing. [0003] At present, the application of sodium fluorotitanate is becoming more and more extensive. For example, CN108439422A discloses a method for preparing titaniu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00
CPCC01G23/002C01P2006/80
Inventor 李兰杰刘静常福增周欣
Owner HEBEI IRON AND STEEL
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