Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas, a clear, colorless, corrosive liquid that emits smoke and has a strong irritating odor. Melting point -83.3 ℃, boiling point 19.4 ℃, density 0.988g/cm ³. Easy to dissolve in water and ethanol, slightly soluble in ether. Due to the relatively strong binding ability between hydrogen and fluorine atoms, hydrofluoric acid cannot be completely ionized in water,So theoretically, hydrofluoric acid has extremely strong corrosiveness and can strongly corrode metals, glass, and silicon containing objects. Toxic, such as inhalation of vapors or contact with skin, can cause incurable burns. Laboratories generally use fluorite (mainly composed of calcium fluoride) and concentrated sulfuric acid to produce it, which needs to be sealed in plastic bottles and stored in a cool place.

1、 Overview

The BJS-III series spray and bubble packing purification tower is a specialized purification treatment equipment designed and developed by Hengshui Baofei Huachuang Fiberglass Manufacturing Co., Ltd. for industries such as glass emulsification, rare earth extraction, and hydrofluoric acid production lines. Based on the BJS bubble packing purification tower, scientific improvements have been made in both appearance and treatment methods. It not only has the bubble reaction of the BJS bubble packing purification tower, but also the spray effect of the BJS-2 spray packing purification tower. It is an optimized product of the above two tower types. This series of purification towers can be used for the treatment of high concentration hydrofluoric acid and fluoride waste gas, with high purification efficiency. It is currently the most ideal purification equipment in China, and the purified waste gas is significantly lower than the national emission standards. The main harmful gases processed are hydrofluoric acid mist, hydrogen chloride, hydrogen fluoride, hydrogen sulfide, hydrogen cyanide, etc.

2、 Working principle

The BJS-III spray and bubble packed purification tower uses sodium hydroxide solution as the absorption and neutralization solution. The exhaust gas is pressed into the purification tower by a fan, forming a pressure chamber in the inner cylinder, and then distributed to each bubble tube through the pressure chamber. The exhaust gas enters the absorption and neutralization liquid in the storage tank through the bubble tube to generate bubbles, and then the bubbles pass through the packing layer, allowing the gas-liquid to fully contact again. The absorbed exhaust gas continues to flow upward and reacts with the absorption and neutralization liquid sprayed from the spray pipe. The standard gas after neutralization reaction is dehazed by the demister device and then discharged into the atmosphere.

3、 Structure and Characteristics

This purification tower body is a cylindrical tower body wrapped with fiberglass as a whole, without segmented connecting flanges. The specific structure consists of a pressure chamber, a liquid storage tank, packing, a spray device, a foam removal device, etc. The structure of this purification tower eliminates the need for the circulating water pump system of a typical purification tower; (2) Adopting the saturated contact of exhaust gas directly entering water, the chemical reaction is complete, and the purification efficiency is high; (3) A new type of filler with a large specific surface area, high porosity, and uniform arrangement is used; (4) Two absorption processes, spray and bubble, are used for sufficient absorption and good purification effect.

This tower can be equipped with a control system consisting of gas online analyzer, pH control meter, differential pressure transmitter, liquid level control meter, solenoid valve, and control cabinet, and is equipped with fault alarm, which facilitates operation, management, and maintenance.

4、 Specification and model