Wuxi hydrofluoric acid

Because hydrofluoric acid solubility oxide, which plays an important role in the purification of aluminum and uranium. Hydrofluoric acid is also used to etch glass, semiconductor industry to use it to remove the silicon oxide surface, it can be used in the refinery alkylation catalyst isobutane and butane, oxygen-containing stainless steel surface to remove impurities The "pickling" process will be used hydrofluoric acid. Hydrofluoric acid is also used in the synthesis of various fluorine-containing organic compounds, such as Teflon (polytetrafluoroethylene), there is a class of Freon refrigerant. 60% aqueous solution containing hydrogen fluoride as a colorless clear liquid smoke. Industrial products are usually HF content of 40 to 45% aqueous solution. [1] Chemical properties 1. highly corrosive and can erode glass and silicate generated gaseous silicon tetrafluoride, but not corrosive polyethylene, lead and platinum; 2. highly volatile, in air That white smoke, intense heat when dissolved in water from hydrofluoric acid; 3. Generate fluoride and salt, oxide and hydroxide; 4. can react with ordinary metal, produce hydrogen with air to form explosive mixtures; 5. the case of Mars is easy to cause an explosion or fire; 6. Hydrogen fluoride is stable to heat, is heated to 1000 ℃ only slightly decomposed; 7. silicon and silicon compound produced by the reaction of gaseous silicon tetrafluoride: SiO2 (s) + 4 HF (aq) → SiF4 (g) + 2 H2O (l) the resulting excess SiF4 and HF can continue, generating fluorosilicic acid: SiF4 (g) + 2HF (aq) = H2 [SiF6] (aq), fluorosilicic acid is a dicarboxylic acid; 8. hydrofluoric acid in aqueous solution with two balance: 1HF = H + F- k1 = 7.2 * 10-42.HF + F- = HF2- k2 = 5.2 at this time with the concentration increases (greater than 5mol), HF is already a very strong acid. [3] 9, hydrofluoric acid salts can be formed, this is one yuan hydrofluoric acid, but can be prepared a series of acid salts such as NaHF2, KHF2, NH4HF2, etc. It is the other three halogen acid. [1] Edit this paragraph 1 role and purpose, it is mainly used as raw material fluorine-containing compounds, but also for the manufacture of aluminum fluoride and cryolite, a semiconductor surface etching and for alkylation catalyst 2, in the electronics industry As strong acidic corrosive, with nitric acid, acetic acid, ammonia, hydrogen peroxide used in conjunction. 3, used as analytical reagents are used in the preparation of high purity fluoride. A fluoride salt, a fluorine refrigerants, fluorine plastic, fluorine rubber, fluorine pharmaceutical and pesticide necessary to fluorine source 4, the production of the refrigerant, "Freon", fluorine-containing resin, an organic fluoride and fluorine materials. Can be used in chemical production, alkylation, polymerization, condensation, isomerization catalyst in organic synthesis. Also used for the exploitation of certain corrosion deposit formation and extraction of rare earth elements, radioactive elements. In the nuclear industry and the production of nuclear weapons are manufactured uranium hexafluoride feed, but also the production of raw materials and additives rocket fuel, can be used for etching glass and impregnated wood. 5, manufactured for organic or inorganic fluoride, such as fluorocarbons, sodium fluoride, aluminum, uranium hexafluoride and cryolite and so on. Also used in stainless steel, non-ferrous metal pickling, glass instrument calibration, glass and mirror engraving, lettering, and polishing glassware, frosted light bulbs and general bulbs processing, metal graphite in addition to silicon purification, metal castings Desanding, graphite ash removing semiconductor (Ge, Si) fabrication. Also used as synthetic dyes. And other organic synthesis catalyst. Also used in electroplating, reagents, fermentation, ceramic processing, and fluorine-containing resin and a flame retardant manufacturing. 6 for etching glass, metal pickling, made inorganic fluoride salt products and chemical reagents. 7, for the nuclear industry, the system element fluorine, fluoride, can also be used as a catalyst, a fluorinated organic or inorganic fluoride and the like for manufacturing, but also for stainless steel, non-ferrous metal pickling, frosted glass and pickling , frosted bulb treatment.