Daily precautions for delicate fluorosilicic acid

Exquisite fluorosilicate hydrogen fluoride is a very important inorganic fluorine basic raw material, and most fluorides are prepared through the substitution (fluorination) or addition reaction of hydrogen fluoride. Usually, hydrogen fluoride can be divided into two categories: anhydrous hydrogen fluoride (AHF, also known as anhydrous hydrofluoric acid) and aqueous hydrofluoric acid. Hydrogen fluoride can easily enter the body through the respiratory tract and skin, causing strong irritation and corrosion to the upper respiratory mucosa and skin. Inhaling high concentrations of hydrogen fluoride can cause bronchitis and pneumonia, affecting glucose metabolism and leading to insufficient energy supply to cells and tissues. There is a lack of literature on the disposal technology of discarded hydrogen fluoride cylinders in current research, so this study is necessary and has significant practical significance.

At present, there is no systematic and mature method at home and abroad to deal with the problem of hydrogen fluoride cylinder leakage. Strict regulations on the storage and transportation of hazardous chemicals, including hydrogen fluoride, have been established in relevant laws and regulations both domestically and internationally. So, it is necessary to strictly handle hydrogen fluoride according to regulations to avoid accidents.

There have been several incidents of hydrogen fluoride cylinder or storage tank leaks in China. The recent successful disposal of discarded hydrogen fluoride steel cylinders occurred in Jiangyin City. In the several plans formulated at that time, the final treatment method was to neutralize with alkaline solution. This is also a commonly used method for dealing with leaked hydrogen fluoride at present.

Physical and chemical properties: White diamond or needle shaped crystals, odorless, relative density of 1.788, melting point of 120 ℃. Can be weathered and lose crystal water. Easy to dissolve in water, soluble in dilute acid, difficult to dissolve in hydrofluoric acid, insoluble in alcohol. The aqueous solution is acidic. When reacting with alkali, corresponding fluorides and silica can be generated. Toxic.

This standard will be a comprehensive standard specifically designed for the discharge of inorganic phosphorus industry pollutants in China. Wen Lining, Deputy Secretary General of the China Inorganic Salt Industry Association and project leader of the "Standards", told reporters that the "Standards" mainly put forward higher emission requirements for the tail gas generated in yellow phosphorus production and the wastewater generated in phosphorus chemical production. According to the China Inorganic Salt Association, if the limit requirements of the "Standard" are met, the emissions of industry wastewater, fluoride, total phosphorus, and COD will be reduced by 54%, 77%, 92%, and 70%, respectively. The emissions of sulfur dioxide, fluoride, particulate matter, and phosphorus pentoxide from exhaust gas will be reduced by 11.1%, 10.53%, 33.3%, and 11.1%, respectively.