What is the purpose of Natriumhydrogenfluoride?

Sodium hydrofluoride (Natriumhydrogenfluoride), that is, sodium hydrogen fluoride, is widely used in industry.

First, in the art of glass etching, sodium hydrogen fluoride can react with silica in glass. The reason for the reaction is that sodium hydrogen fluoride can release hydrofluoric acid in contact with water, and hydrofluoric acid combines with silica to form gaseous silicon tetrafluoride. In this way, the glass surface is eroded, and the desired pattern or pattern can be obtained. Although ancient craftsmen did not understand this precise chemical principle, their etching effect was observed in practice or used in the production of exquisite glassware, so that the surface of the utensils has exquisite decoration.

Second, it is also used in the treatment of metal surfaces. Gold is a common oxide layer during processing or storage. Sodium hydrogen fluoride can remove rust and oxides on the metal surface, make the metal surface clean, facilitate subsequent electroplating, painting and other processes, increase the adhesion between metal and plating or coating, and make metal products more durable and beautiful. Such as ancient metal utensils, before modification or similar things are used to clean their appearance.

Third, in the field of fluxes, sodium hydrogen fluoride is also useful. In metallurgy, the addition of sodium hydrogen fluoride can reduce the melting point of ore, promote the separation of metal and gangue, and improve the efficiency of metal extraction. This is in ancient metallurgy, or a method to help smelt and improve the purity of metals. Although sodium hydrogen fluoride was used at that time or was not refined, its melting nature was similar to this.

In addition, in terms of wood preservation, sodium hydrogen fluoride can penetrate into the wood fibers, inhibit the growth of microorganisms, prevent wood decay, and keep the wood from being damaged for a long time. Timber used in ancient buildings, boats, etc. may also be treated with similar preservatives to extend their lifespan.

What are the physical and chemical properties of Natriumhydrogenfluoride

Sodium hydrofluoride, or sodium hydrogen fluoride (NaHF ²), is an important chemical substance that has the following physical and chemical properties:
- ** Properties **: This is a white crystalline powder with a pure and delicate appearance. It is like fine snow in winter, and may appear slightly shiny in the sun. Its texture is uniform and free of impurities to the naked eye.
- ** Solubility **: It is very soluble in water, just like salt melts in soup. When it meets water, it instantly turns invisible and quietly merges into the water to form a uniform solution. And when it dissolves, there may be slight heat changes, but it is usually not very significant. < Br > - ** Stability **: In a dry environment at room temperature and pressure, sodium hydrogen fluoride is quite stable, just like a stable old man, and can maintain its own structure and properties for a long time. However, when the ambient temperature rises sharply or encounters humid air, its stability is challenged. At high temperatures, sodium hydrogen fluoride may decompose to produce gases such as hydrogen fluoride; in humid air, it will also slowly hydrolyze, causing its composition and properties to change.
- ** Acidic **: Although it is not a strong acid, it has a certain degree of acidity, similar to a soft acid. It can partially ionize in water, release hydrogen ions, and can neutralize and react with bases, just like softness overcoming rigidity. This acidic property is of great significance in many chemical reactions and industrial processes. It is often used as an acidic catalyst to accelerate the reaction process.
- ** Corrosive **: Corrosive to some metals and organic matter, like a hidden etching blade. It can chemically react with metal surfaces, eroding metals, causing damage to their surfaces, affecting metal properties and life. For some organic matter, it can also damage its structure and change its properties. Therefore, when storing and using sodium hydrogen fluoride, it is necessary to choose the device carefully to prevent corrosion.

What is Natriumhydrogenfluoride production method?

Natriumhydrogenfluoride, that is, acid sodium fluoride. There are various ways to prepare it.

One method is to combine hydrofluoric acid with sodium carbonate. First take an appropriate amount of hydrofluoric acid, put it in a clean vessel, and slowly add sodium carbonate. The reason for the reaction is that the hydrogen ion of hydrofluoric acid interacts with the carbonate ion of sodium carbonate. When the two meet, the carbonate ion is converted into hydrogen ion, which is gradually converted into carbon dioxide, water and sodium fluoride. However, this process needs to control the rate and temperature of the reaction. If the reaction is too fast, the carbon dioxide will escape too much, or the solution will splash, and the temperature will be too high, or the purity of the product will be affected. The reaction equation is roughly: $2HF + Na_ {2} CO_ {3}\ longrightarrow 2NaF + H_ {2} O + CO_ {2}\ uparrow $, and to obtain acid sodium fluoride, it is necessary to accurately prepare the ratio of the two, so that a little excess of hydrofluoric acid can generate $NaHF_ {2} $.

Another method is to introduce an appropriate amount of hydrofluoric acid gas into the sodium fluoride solution. Sodium fluoride dissociates into sodium ions and fluoride ions in water. After the hydrofluoric acid is introduced, the hydrofluoric acid molecules combine with fluoride ions to form $HF_ {2} ^ {-} $ions, which coexist with sodium ions, and then obtain acid sodium fluoride solution. In this process, the gas inlet rate and the concentration of the solution need to be carefully controlled. If the inlet is too fast, it may cause local overreaction and uneven product; if the solution is too dilute, it will take time to concentrate, too concentrated or crystallize.

Furthermore, the reaction of hydrofluoric acid and sodium hydroxide can also be obtained. However, this reaction needs to be more cautious, because sodium hydroxide is a strong base and hydrofluoric acid is a weak acid, the reaction between the two is violent, and it needs to be added dropwise slowly, and the pH of the solution should be monitored at all times. Initially, hydrofluoric acid reacts with sodium hydroxide to form sodium fluoride and water. After the sodium fluoride is formed, an appropriate amount of hydrofluoric acid is added to promote the further reaction of sodium fluoride with hydrofluoric acid to form acid sodium fluoride.

All these preparation methods need to pay attention to the specifications of operation, and control the reaction conditions, such as temperature, concentration, proportion of reactants, etc., in order to obtain pure Natriumhydrogenfluoride products.

What are the precautions when using Natriumhydrogenfluoride?

Sodium hydrofluoride, that is, sodium hydrogen fluoride, needs to be aware of several things when using it. First, this material is corrosive, and it can hurt the skin and corrode clothes when touched. When handling it, you must wear protective clothing, protective gloves, and goggles to avoid it. Second, it may release hydrogen fluoride gas in the air. This gas is highly toxic and highly irritating, damaging the respiratory organs. Therefore, the place used must be well ventilated, or a ventilation device should be installed to drive away harmful gases. Third, it should be stored properly after use, and it should be placed in a dry and cool place to avoid mixing with acids and alkalis to prevent chemical reactions. Fourth, when mixing the solution, it should be slowly poured into the water, stirring it, do not reverse the order, because of dissolution and exothermic, water into the object or cause liquid to splash out. Fifth, the operator should be familiar with its nature and emergency treatment methods. If you accidentally touch it, quickly flush it with a lot of water, and seek medical attention for those who are serious; if the gas leaks, it will be withdrawn to a well-ventilated place, and those who are serious will also seek medical attention. In this way, the safety of sodium hydrofluoride can be guaranteed.

What is the price range of Natriumhydrogenfluoride in the market?

Natriumhydrogenfluoride, that is, sodium hydrogen fluoride. In the market, its price range is difficult to determine. The price of the cover often varies due to many factors, such as the supply and demand of the market, the cost of the system, the quality of the quality, the difference in time, and the production area also has an impact.

If the approximate price is said, the refined and high purity will be more expensive; coarse and less pure, the price or slightly cheaper. In the market of chemical raw materials, if it is a grade commonly used in industry, the price per kilogram may range from tens of yuan to nearly 100 yuan. If it is a high-purity reagent grade, used in scientific research, precision manufacturing, etc., the price often exceeds 100 yuan per kilogram, or even higher, up to hundreds of yuan per kilogram.

The supply and demand of the city is the main reason. If the industry of sodium hydrogen fluoride is prosperous at a certain time, and there are many people who need it, but the quantity produced is limited, the price will rise; on the contrary, if the supply exceeds the demand, the price may fall. The cost of the system is related to the price of raw materials, energy consumption, and the simplicity of the process. The price of raw materials will increase, the energy consumption will increase, or the cost will increase due to the complexity of the process, and the price will also be high. The quality is also dependent on the price. The superior has less impurities, good performance, and a high price for self-sale; the inferior is the opposite.

And different places have different prices due to differences in transportation costs, local policies, and market competition. In the vicinity of the place of origin, the price may be lower than elsewhere due to the saving of long-distance freight, etc. In order to know the exact price, we must carefully consider the current market conditions and negotiate with various suppliers before we can obtain it.