What is the use of silicon in ironmaking?

There is no need to add elemental silicon to the raw materials, and the raw materials used (mainly sinter) contain a large amount of silica.

I think the landlord meant to ask: the use of silica and silica in molten iron.

First of all, silica is one of the most important components in slag, slag alkalinity refers to the ratio of calcium oxide and silica, when the amount of silica is large, the alkalinity of slag will be low, which is the fluidity of slag is better, but the effect of slag desulfurization will be very poor, and the sulfur of molten iron is easy to exceed the standard (commonly known as external iron); On the contrary, the silica content decreases, the alkalinity of the slag increases, and the desulfurization effect is improved, but the fluidity is poor, which will affect the prograde operation of the blast furnace in serious cases.

Secondly, the elemental silicon in molten iron, the furnace temperature usually said by ironmakers, does not refer to the temperature of the furnace or molten iron, but refers to the silicon content. In the production, some of the silica will be converted into silicon elements into molten iron, when the furnace heat is sufficient, the silicon reduction will be more, and vice versa, it will be less. The silicon content is an important indicator of the state of the furnace.

Usually experienced workers can judge the running state of the furnace by the patterns of iron flowers, soot, and molten iron. In addition, in the process of steelmaking, a large amount of silicon will be oxidized, which will release a large amount of heat, which will greatly help steelmaking to reduce energy consumption.

From the perspective of ironmaking, increasing the silicon content will lead to an increase in the coke-to-coal ratio, an increase in the cost of ironmaking, and too much reduction in the silicon content (the alkalinity of the slag remains unchanged) will often make the sulfur content exceed the standard. Therefore, the estimation of silicon, sulfur and slag alkalinity in production is the main basis for the operation of the blast furnace foreman, mainly for material change.

If there is any, it is to add silicon outside the furnace to refine cast iron, this. I'm ashamed, I don't know.

It seems that the questioner is a layman, so let me explain it to you. Elemental silicon is not used in the ironmaking process. In the sinter used in ironmaking, there are silicon oxides, silicon dioxide.

It is used to adjust the alkalinity of slag, because silica is an acidic oxide, which is slightly acidic in the slag, which can make the slag have good fluidity and be discharged out of the furnace, but the disadvantage is that silica has no desulfurization ability, which increases the sulfur in pig iron. The silica in all slags has a degree, which is the alkalinity of the slag.

The finished pig iron also contains silicon, because the silicon needs to absorb a lot of heat to reduce it, so blast furnace workers usually use the amount of silicon in the molten iron to determine the furnace temperature. (The heat required to reduce the unit of molar silicon is 8 times the heat required by the same pig iron), the reduced silicon also has a degree, and the content should not be too high, because if it is high, it will affect the coke ratio of the blast furnace and increase the cost of ironmaking, and if the silicon reduction is too small, it will not work, because it is not conducive to the next step of steelmaking, because silicon is an important heating element in the steelmaking process (similarly, silicon oxidation also releases a lot of heat).

To remove oxides and other impurities in molten iron, the general dosage is not very large.

Removes oxides and other impurities from molten iron!

Ferrosilicon is a ferroalloy composed of iron and silicon.

Ferrosilicon is also called silicon [ xī ] iron. It is an iron-silicon alloy made of coke, steel scraps, quartz (or silica) as raw materials and smelted in an electric furnace. It is widely used in the steel industry, foundry industry and other industrial production.

Ferroalloy composed of iron and silicon (silicon reduced at a high temperature of 1500-1800 degrees Celsius with silica, steel, and coke as raw materials is melted into molten iron to form ferrosilicon alloy). It is an important alloy variety in the smelting industry.

Smelting: Ferrosilicon is made by smelting with an electric furnace using coke, steel scraps, quartz (or silica) as raw materials. Traditionally, ferrosilicon is made by reducing silicon from silica containing SiO2. Most of the smelting of ferrosilicon uses metallurgical coke as a reducing agent, and steel scraps are the regulator of ferrosilicon.

Uses of Silicon:

High-purity monocrystalline silicon is an important semiconductor material. Trace amounts of group IIIA elements are incorporated into monocrystalline silicon to form p-type silicon semiconductors; A small amount of group VA elements is incorporated to form n-type and p-type semiconductors combined, which can be made into solar cells, which convert radiant energy into electrical energy. It is a promising material in the development of energy sources.

Cermet, an important material for astronautics. Ceramics and metals are mixed and sintered to make cermet composites, which are resistant to high temperatures, rich in toughness, and can be cut, which not only inherits the respective advantages of metals and ceramics, but also makes up for the congenital defects of both.

The first space shuttle can be applied to the manufacture of military **"USS Columbia"It can withstand the high temperature caused by the friction when traveling through the dense atmosphere at high speed, all thanks to its shell made of 31,000 silicon tiles.

Optical fiber communication, the latest modern means of communication. Pure silica is used to draw high-transparency glass fibers, and the laser is transmitted forward with countless total reflections in the path of the glass fibers, replacing bulky cables.

Optical fiber communication capacity is high, a hair as fine as a glass fiber, can transmit 256 channels at the same time**, it is also not subject to electrical and magnetic interference, not afraid of eavesdropping, with a high degree of confidentiality. Fiber optic communication will revolutionize human life in the 21st century.

Excellent performance of silicon organic compounds. Silicone plastics, for example, are excellent waterproof coating materials. Spraying silicone on the walls of an underground railroad can solve the problem of water seepage once and for all.

On the surface of ancient cultural relics and sculptures, a thin layer of silicone plastic can prevent the growth of moss and resist wind, rain and weathering. The Monument to the People's Heroes in Tiananmen Square is treated with silicone plastic, so it is always white and fresh.

Organosilicon compounds refer to compounds that contain Si-O bonds and at least one organic group is directly linked to silicon atoms, and those compounds that connect organic groups to silicon atoms through oxygen, sulfur, nitrogen, etc. are also commonly regarded as organosilicon compounds.

Among them, polysiloxane composed of silicon-oxygen bond (-si-0-si-) as the skeleton is the most numerous, deepest-studied and most widely used class of organosilicon compounds, accounting for more than 90% of the total dosage.

Ferrosilicon is a ferroalloy composed of iron and silicon.

Ferrosilicon is an iron-silicon alloy made by smelting coke, steel scraps, quartz (or silica) as raw materials and using an electric furnace. Because silicon and oxygen are easy to synthesize silica, ferrosilicon is often used as a deoxidizer in steelmaking, and because SiO2 releases a large amount of heat when it is generated, it is also beneficial to increase the temperature of molten steel while deoxidizing.

At the same time, ferrosilicon can also be used as an alloying element additive, widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, ferrosilicon is often used as a reducing agent in ferroalloy production and chemical industry.

Ferrosilicon is used as a deoxidizer in steelmaking, because silicon and oxygen are easy to synthesize silica, so ferrosilicon is often used as a deoxidizer in steelmaking. Ferrosilicon can also be used as an alloying element additive, which is widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel.

Ferrosilicon. Ferrosilicon is an iron-silicon alloy made of coke, steel scraps, and quartz as raw materials and smelted in an electric furnace.

Ferrosilicon is an indispensable deoxidizer in the steelmaking industry, and in torch steel, ferrosilicon is used for precipitation deoxidation and diffusion deoxidation.

Ferrosilicon contains a small amount of phosphorus metal compounds, such as calcium phosphide, etc., when transported by vehicles and ships or stored in warehouses, if moisture, phosphine will be released, causing poisoning in or around the warehouse.

There are many uses for ferrosilicon, such as:

1. In the field of steelmaking industry, it can be used as "deoxidizer" and "alloying agent".

2. In the field of cast iron industry, it can be used as a "reducing agent", "spheroidizing agent" and "inoculant".

3. In the field of mineral processing industry, it can be used as a "suspended phase".

4. In the field of welding electrode manufacturing industry, it can be used as "coating for welding rod".

5. In the field of chemical industry, it can manufacture "silicone" and other products.

Ferrosilicon is a ferroalloy composed of iron and silicon. Ferrosilicon is an iron-silicon alloy made of coke, steel scraps, quartz (or silica) as raw materials, smelted in an electric furnace At the same time, ferrosilicon can also be used as an alloying element additive, which is widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, and ferrosilicon is often used as a reducing agent in ferroalloy production and chemical industry. <

Ferrosilicon is a ferroalloy composed of iron and silicon. Ferrosilicon is an iron-silicon alloy made of coke, steel scraps, quartz (or silica) as raw materials, smelted in an electric furnace At the same time, ferrosilicon can also be used as an alloying element additive, which is widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, and ferrosilicon is often used as a reducing agent in ferroalloy production and chemical industry.

Ferrosilicon is often used as a deoxidizer in steelmaking, and because SiO2 releases a lot of heat when it is generated, it is also beneficial to increase the temperature of molten steel while deoxidizing. Ferrosilicon can also be used as an alloying element additive, widely used in low-alloy structural steel, spring steel, bearing steel, heat-resistant steel and electrical silicon steel, ferrosilicon is often used as a reducing agent in ferroalloy production and chemical industry.

Adding a certain amount of silicon to the steel can significantly improve the strength, hardness and elasticity of the steel, increase the permeability of the steel, and reduce the hysteresis loss of the transformer steel.

High-silicon ferrosilicon or siliceous alloys are used in the ferroalloy industry as a reducing agent in the production of low-carbon ferroalloys. Ferrosilicon can be used as an inoculant for ductile iron when added to cast iron, and can prevent the formation of carbides, promote the precipitation and nodularization of graphite, and improve the properties of cast iron.

Ferrosilicon powder can be used as a suspended phase in the mineral processing industry, and as a coating for welding rods in the electrode manufacturing industry; High silicon ferrosilicon can be used to prepare semiconductor pure silicon in the electrical industry, and can be used to make silicone in the chemical industry.