pyridine sulfurtrioxide complex

Ferric oxide is the main component of rust. It has a wide range of uses and is important in many fields.
First, in the metallurgical industry, it is the key raw material for iron smelting. The smelting of cover iron often depends on the reaction of iron trioxide and carbon monoxide and other reducing agents. "Tiangong Kaiwu" says: "Where iron is separated and cooked, it is raw when it comes out of the oven and not fried, and it is cooked when it is fried. When it is raw and cooked, it is made into steel." During ironmaking, iron trioxide reacts with carbon monoxide at high temperature, and iron is reduced and precipitated to produce iron. This process lays the foundation for the production of iron, which is related to the foundation of the country and the livelihood of the people.
Second, in the pigment industry, iron oxide is also very important. Because of its various colors, such as red, yellow, brown, etc., it is often used as a pigment. Although "Tiangong Kaiwu" does not elaborate on the details of its pigments, in ancient times, pigments were widely used, and were needed for painting, dyeing and weaving. The pigments made of iron oxide are bright and long-lasting. In the art of painting, they can help painters present exquisite colors. In the dyeing and weaving industry, they can make fabrics colorful and not easy to fade, adding many colors to life.
Third, in the electronics industry, iron oxide is also used. It has certain magnetic properties and can be used to make magnetic materials. Although there was no electronics industry in the era of "Tiangong Kaiwu", today, magnetic materials are indispensable in the fields of electronic equipment such as transformers and magnetic recording media. Ferric oxide is specially treated to make magnetic materials, which contribute to the development of electronic technology.
Fourth, in the chemical industry, ferric oxide can be used as a catalyst. In some chemical reactions, it can accelerate the reaction process and improve the reaction efficiency. Chemical production pursues high efficiency and quality. As a catalyst, ferric oxide can promote the reaction to proceed more smoothly, save energy and time costs, and is of great significance to the development of the chemical industry. From this perspective, ferric oxide has a wide range of uses, playing an important role in industry, art, and many other aspects, and has a profound impact on the progress and development of human society.

The compound of ferric oxide has many physical and chemical properties. This is the main component of hematite, with a reddish-brown color, which is often found in nature.
In terms of its physical properties, ferric oxide is a reddish-brown powder with a fine texture. Its density is about 5.24 g/cm3, which is relatively heavy. The melting point is quite high, reaching 1565 ° C, which makes it melt in high temperature environments. It is insoluble in water and insoluble in many organic solvents.
As for chemical properties, ferric oxide has the properties of basic oxides. It can react with acid. In case of hydrochloric acid, ferric chloride and water will be produced. The reaction formula is: Fe 2O O < unk > + 6HCl = 2FeCl < unk > + 3H2O O. It reacts with sulfuric acid to form ferric sulfate and water. This reaction is often used in rust removal to remove rust on metal surfaces.
Ferric oxide can also be reduced by reducing agents. Take carbon monoxide as an example. At high temperature, carbon monoxide can reduce it to iron elementals and carbon dioxide. The reaction formula is: Fe 2O O < unk > + 3CO = high temperature = 2Fe + 3CO < unk >. This is a key reaction in ironmaking and is crucial in the metallurgical industry. < Br >
In addition, ferric oxide has a certain degree of oxidation, although it is not as strong as a strong oxidant, it can oxidize certain substances and reduce itself in a specific reaction.
In addition, because of its bright color, it is widely used in the field of pigments, which can add color to paints, paints, ceramics, etc., giving it a reddish-brown tone and enhancing its appearance. And because of its relatively stable chemical properties, it can keep pigments from fading for a long time.

When using ferric oxide mixture, all kinds of precautions should not be ignored.
First, its properties should be carefully examined. If the ferric oxide mixture has discoloration, precipitation, peculiar smell and other abnormalities, this is a sign of quality change and must not be used again. If the color of the mixture deviates from the usual red-brown, or the bottom is abnormally precipitated, it is a warning. If it is used at this time, it will not only be difficult to achieve the expected effect, but also cause adverse results.
Second, it is related to the dosage. It must be used in accordance with the doctor's instructions or instructions, and must not be increased or decreased without authorization. If the dosage is too small, the effect will be difficult to show, and the disease will not be solved; if the dosage is too much, it may cause toxic side effects and damage the body. If the patient needs to treat iron deficiency anemia, excessive use of this mixture may cause iron poisoning, causing gastrointestinal discomfort, vomiting, abdominal pain and other diseases.
Third, when using this mixture, the diet should also be particular. It is advisable to avoid tea, coffee and other substances, because the ingredients it contains can complex with iron and block the absorption of iron. It is also not advisable to eat high-calcium foods, take calcium and iron together, or interfere with each other's absorption. In daily diet, you can eat more fruits and vegetables rich in vitamin C, such as oranges, strawberries, green peppers, etc. Vitamin C can promote iron absorption and increase the efficacy.
Fourth, the method of medication should also be paid attention to. This mixture should be taken after meals to reduce the irritation to the stomach. When taking it, send it with warm water, do not swallow it dry, so as not to hurt the throat and esophagus. And it is not advisable to lie down immediately after taking it, and move for a while to prevent the reflux of the mixture.
Fifth, special groups should be more cautious when using drugs. Pregnant women, breastfeeding women, children and the elderly have specific constitutions, so be sure to consult a doctor before using the drug. Pregnant women's medication is related to the safety of the fetus, the delicate organs of children, and the decline of metabolic function in the elderly. It is necessary for doctors to determine the appropriate method and amount according to individual conditions.

The method of preparing ferrous oxide complex can be carried out according to the following steps.
Take the first iron salt, such as ferrous sulfate. In a suitable container, dissolve ferrous sulfate into an appropriate amount of water to form a uniform solution. This step requires attention to the water temperature and the speed of stirring. If the water temperature is too high or too low, it may affect the dissolution effect. Stirring too fast or too slowly is not conducive to the uniformity of the solution.
Next, slowly drop in the alkali solution, such as sodium hydroxide solution. When dripping, be sure to slowly and evenly react with the iron salt solution. During this process, ferrous hydroxide will form a precipitate, which is initially white in color. However, due to the fact that ferrous hydroxide is easily oxidized by oxygen in the air, it quickly turns into gray-green and eventually turns into a reddish-brown iron hydroxide precipitate. This oxidation process is quite critical, which is related to the purity and quality of the final product.
After the precipitate is completely formed, filter it. Select a suitable filter paper and funnel to ensure that no impurities are mixed in during the filtration process. The precipitate after filtration needs to be washed with distilled water multiple times to remove the attached impurity ions, such as sulfate ions, sodium ions, etc. When washing, add an appropriate amount of distilled water each time, gently stir the precipitate, and then filter it again, repeating several times until no impurity ions can be detected in the washing solution. < Br >
Then, the washed iron hydroxide precipitate is moved to a crucible and burned at high temperature. Control the temperature and time of burning. If the temperature is too low, the precipitate will be difficult to completely decompose. If the temperature is too high, the product may be sintered and its properties will be affected. Generally speaking, the burning temperature is maintained within a certain range, and after a certain period of time, the iron hydroxide will decompose into iron oxide.
As for the preparation of iron oxide complexes, a suitable complexing agent needs to be selected. Common complexing agents include ethylenediaminetraacetic acid (EDTA) and so on. In an appropriate amount of solvent, the prepared ferric oxide and the complexing agent are mixed in an appropriate proportion, and the ferric oxide complex is formed by stirring and heating. During this period, it is necessary to pay close attention to the temperature, time and proportion of the reactants of the reaction, which are all important factors affecting the formation and performance of the product. After this step, the ferric oxide complex can be obtained.

Ferric oxide, the main component of hematite, is reddish-brown in color. It is very active in chemical reactions, and meets many other things, often causing wonderful changes.
When encountering acid, ferric oxide and acid compounds come into contact, just like dry wood meets fire and responds quickly. Take hydrochloric acid as an example, the two meet, that is, raw ferric chloride and water. This reaction shows that the solid ferric oxide gradually dissolves, the solution turns yellow-brown, and the resulting ferric chloride dissolves into it. The chemical formula is: $Fe_ {2} O_ {3} + 6HCl = 2FeCl_ {3} + 3H_ {2} O $. The same is true of sulfuric acid, and the reaction with it also results in iron sulfate and water.
If it is a reducing agent, iron trioxide also has a different performance. Take carbon monoxide as an example. In a high temperature environment, carbon monoxide, like a brave soldier, captures the oxygen in iron trioxide and turns itself into carbon dioxide, while iron is reduced and precipitated. This is a key reaction in ironmaking. In a blast furnace, this scene often occurs. Looking at it, black iron gradually emerges, while the gas product carbon dioxide escapes. The reaction formula is: $Fe_ {2} O_ {3} + 3CO\ stackrel {high temperature }{=\!=\!=} 2Fe + 3CO_ {2} $. Hydrogen can also do this. At the appropriate temperature, it reacts with iron oxide to reduce iron and produce water.
In addition, iron oxide reacts with certain metals. For example, aluminum powder is mixed with iron oxide, and after ignition, a violent thermite reaction occurs. This reaction is extremely hot, like a world falling apart, aluminum replaces iron in iron oxide and generates aluminum oxide. The heat released by this reaction can cause iron to melt into liquid, which is often used in rail welding. Its chemical equation is: $2Al + Fe_ {2} O_ {3}\ stackrel {high temperature }{=\!=\! =} Al_ {2} O_ {3} + 2Fe $.
It can be seen that when iron oxide meets other things, depending on the different things and conditions, the reactions generated are different, and they are of vital importance in many fields such as chemical industry and metallurgy.