Reagent grade hydrofluoric acid preparation device

Abstract

The invention discloses a reagent grade hydrofluoric acid preparation device. The reagent grade hydrofluoric acid preparation device comprises a drying tank; a feeding port is mounted in one side of the upper part of the drying tank; an air pump is mounted on one side, far away from the feeding port, of the upper part of the drying tank; and an air introducing pipe is mounted at an output end of the air pump. The reagent grade hydrofluoric acid preparation device is provided with the drying device; fluorite powder is subjected to complete drying treatment through hot air sprayed from a rotaryspraying head to prevent water in the undried fluorite powder from influencing the concentration of hydrofluoric acid after a production reaction, so that the production quality is improved; the hydrofluoric acid preparation device is provided with two groups of distillation columns, namely, a crude distillation column and a rectifying column; the crude distillation column is mainly used for removing most sulphuric acid, water and fluorite powder; the rectifying column can effectively remove metal ions from the hydrofluoric acid; through double purification,a hydrofluoric acid solution with high purity can be produced; compared with conventional single distillation column, the purifying filtering effect is better; the precision is higher; and an additive is not required to be added manually, so that the operation is more convenient.

Description

technical field [0001] The invention relates to the technical field of hydrofluoric acid production equipment, in particular to a reagent-grade hydrofluoric acid production device. Background technique [0002] Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, a clear, colorless, fuming corrosive liquid with a strong pungent odor, easily soluble in water, ethanol, and slightly soluble in ether. Due to the ability of hydrofluoric acid to dissolve oxides, it It plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, which can engrave patterns, mark scales and characters. The semiconductor industry uses it to remove oxides on the surface of silicon. The existing hydrofluoric acid is in production It is usually made by mixing dry fluorite powder and sulfuric acid, often because the moisture in fluorite powder contains a small amount of water, which affects the pH value of the finished product when it rea...

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Problems solved by technology

[0002] Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, a clear, colorless, fuming corrosive liquid with a strong pungent odor, easily soluble in water, ethanol, and slightly soluble in ether. Due to the ability of hydrofluoric acid to dissolve oxides, it It plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, which can engrave patterns, mark scales and characters. The semiconductor industry uses it to remove oxides on the surface of silicon. The existing hydrofluoric acid is in production It is usually made by mixing dry fluorite powder and sulfuric acid, often because the moisture in fluorite powder contains a small amount of water, which affects the pH value of the finished product when it reacts with sulfuric acid, and hydrofluoric acid will produce metal ions during production, usually The control of metal ions in hydrofluoric acid in the kettle is achieved by adding additives. This method cannot completely remove the metal ions in hydrofluoric acid, thereby affecting the quality of hydrofluoric acid. At the same time, after the production of hydrofluoric acid, A large amount of acidic harmful gas will be produced, and if it is produced on a large scale, it will easily pollute the air. Therefore, the present invention proposes a reagent-grade hydrofluoric acid production device to solve the problems existing in the prior art

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