application of ferrosilicon powder in steelmaking

As we all know, ferrosilicon is an iron alloy composed of silicon and iron, and ferrosilicon powder is made by grinding ferrosilicon alloy into powder, so the principle of adding reducing agent in steelmaking ferrosilicon is the same as that of adding reducing agent in steelmaking ferrosilicon powder.

Smelting ferrosilicon as reducing agent used in the majority is metallurgical coke, metallurgical coke in the coking process ferroalloy carbonization temperature is 1100 degrees Celsius, so high temperature metallurgical coke is also known as coke or burn, and coke is a kind of low temperature gas, is a byproduct of producing gas, each for smelting ferrosilicon smelting is not quite understand, don't understand why in the process of smelting ferrosilicon to join part of coke gas, the following will give you a comparison of the gas coke and metallurgical coke.

1. Resistance, particle size 10 ~ 15 mm various coke, specific resistance and temperature relationship.The resistance of gas coke is greater than that of metallurgical coke, even at higher temperatures.An important advantage of gas coke when resistance is high.It has been proved that some gas coke can be used in casting ferrosilicon, and the electrode can be deeply inserted into the burden, so as to reduce the power consumption.

2. Chemical composition: gas coke contains lower fixed carbon and higher ash content, which is not as good as metallurgical coke in terms of chemical properties.This is due to the lower coking temperature of gas coke.The carbon content of gas coke is low, use it as reducing agent to add more, at the same time because of the high ash in gas coke, steelmaking slag amount also increased, on the other hand also because of the lower carbon in gas coke and its mechanical strength is poor.In smelting there is often a lack of carbon in the crucible and below.Visible, cast iron all use gas coke as reducing agent, furnace is not easy to maintain.

Stomatal rate and reaction ability, gas coke stomatal rate is 40 ~ 60 more than metallurgical coke stomatal rate, which not only makes the gas coke resistance large, but also expand the reaction contact surface, on the other hand, the gas coke reaction ability is also high, all favorable reaction speed.

4.cost, the price of gas coke is 10 ~ 20 lower than metallurgical coke.

Through these information, we clearly know that gas coke has the advantages of high porosity, large resistance and low cost, but it also has disadvantages, such as low carbon content, high ash content and poor mechanical strength.So in smelting ferrosilicon is not all the use of gas coke, to use with metallurgical coke collocation.Through practice and experiment, it is proved that the combination of 30-40% gas coke and metallurgical coke can achieve good results and reduce the unit power consumption.

What are the specific applications of ferroalloy ferrosilicon powder in steelmaking

Ferrosilicon powder is generally rolled and rolled with high ferrosilicon. In the process of electric steelmaking, ferrosilicon powder is used for diffusion deoxidation.The deoxidizing process is carried out on the surface of slag steel, so the application of ferrosilicon powder as deoxidizer for ferroalloy is not easy to contaminate the liquid steel and reduce the inclusion content in the steel.The higher the silicon content in the silicon powder, the more its weight, such as silicon content of 45 percent of the silicon powder, the proportion of 5.15, and the content of 75 percent of the silicon powder, the proportion of 3.5.

The ferrosilicon powder rolled by ferrosilicon is heavier. After it is added, it can quickly enter the liquid steel and conduct precipitation deoxidation to increase silicon in the molten steel.However, the silicon iron powder rolled by high silicon iron is lighter, which is very beneficial to diffusion deoxidation.Moreover, the higher the content of silicon, its deoxidation is also stronger, so, ferrosilicon powder is generally used high ferrosilicon rolled into.

When ferrosilicon powder was added, it had little influence on the heating time of molding sand, but it had obvious influence on heating temperature and hardening strength of molding sand.With the increase of adding amount of ferrosilicon powder, the heating temperature and strength increase, the higher the silicon content in ferrosilicon, the finer the particle size is, the less the surface oxidation, and the effect is enhanced accordingly.

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