High Purity Ferrosilicon

What is High Purity Ferrosilicon?

Oxygen in steel making has a major impact on the quality of steel and therefore needs to be effectively reduced in the molten steel. The advantage of high purity ferrosilicon is that the use of ferrosilicon for steelmaking can significantly reduce the oxygen content, reduce the formation of oxides, significantly increase the purity of the molten steel and improve the quality of the steel. High purity ferrosilicon is rich in silicon, which has a wide range of silicon used in steel, not only to reduce the oxygen content but also to improve the flow properties of the molten iron and improve the form of inclusions so that impurities float on the surface of the molten steel and are thus easy to clean.

The new process of high purity ferrosilicon overcomes the shortcomings of traditional methods, selects appropriate raw materials and process conditions, and produces high purity ferrosilicon for use in the smelting of high-grade silicon steel. The production of high purity ferrosilicon uses selected quartz stone + petroleum coke (or petroleum coke plus a small amount of other carbon) + silicon steel scraps, which are reduced in a submerged arc furnace. The petroleum coke particle size is 0-10mm, and the optimal particle size is 0-5mm. The furnace charge ratio is quartz stone: petroleum coke: silicon steel scraps = 100: 40-55: 5-55. This ratio is based on fixed carbon content. The chemical composition (weight) requirements of quartz stone are SiO2>98.0%, Al2O3<0.03%, CaO<0.01%, and the total of other impurities except iron oxide is less than 0.02%. The impurity content of the obtained high-purity ferrosilicon product can be controlled within the following range; Si and Fe are effective elements, and the proportion is adjusted according to the usage requirements. If necessary, according to changes in the required amounts of individual elements, chlorine gas can be introduced into the liquid product for 20-40 minutes, 20kg, or oxygen for 30-40 minutes, 5kg, or water gas (H2+H2O) for 20-40 minutes, 5kg.

The smelting operation of high-purity ferrosilicon is the same as that of ordinary submerged furnace method for producing ferrosilicon alloy. That is, the submerged arc furnace is powered on and heated up to bake to above 1000°C, and the mixed materials are gradually added into the furnace until the furnace is full. Then, the material level is maintained, and the materials are added as needed, and the furnace is pounded and pierced as needed. Continuous reduction smelting, intermittent furnace opening, the first discharging time is longer, and then the regular discharging time varies with the capacity. Under normal circumstances, there is no need for refining outside the furnace. If the impurities in the finished product exceed the standard due to slightly high impurities in the ore, a small amount of chlorine, oxygen, or a combination of chlorine and oxygen can be used according to the impurity composition of high purity ferrosilicon for liquid refining outside the furnace. Sampling analysis, ingot casting, crushing and packaging.

1. Screening raw material silica, reducing agent, steel powder or/silicon steel shavings, silica is quartz stone or white silica, black silica, reducing agent is metallurgical coke and gas coal coke, or semi-coke and gas coal coke, semi-coke and petroleum coke and wood blocks, According to the exact component content of various raw materials and the requirements for all element components of the species to be produced, the amount of each raw material is calculated according to known technology, and the ingredients are mixed and filled into the submerged arc furnace for smelting according to the usual conditions and operations for smelting ferrosilicon alloys.
2. Add the calculated amount of pre-melted synthetic slag or/and silica fume, quartz powder, CaF2 or CaO to the refined iron ladle before the furnace is covered with bottom oxygen blowing refining and ferrosilicon is discharged from the submerged arc furnace to adjust the composition of the slag to a weight content of SiO2 > 60 %, CaO < 30%, others < 10%, heat the molten iron ladle and pre-melt the slag and bake it to > 200°C, put it into the submerged arc furnace to release the molten iron, and at the same time blow oxygen or air through the bottom of the ladle, oxygen plus helium , Air plus helium, air plus oxygen for refining outside the furnace, gas pressure > 0.5MPa, gas flow > 6Nm3/h, refining time 30-40 minutes.
3. It is required to remove the silicon carbide (SiC) precipitated on the surface of the ferrosilicon containing C<0.03% and the slag adhered to the surface of the ingot after the ingot is cooled, so as to obtain high-quality ferrosilicon products.

• Superior Purity: Ensured by the meticulous selection of high-grade raw materials, the High-Purity Ferrosilicon boasts unrivaled levels of purity, setting it apart from other alloys in the market.
• Distinctive Composition: This alloy consists predominantly of iron (Fe) and silicon (Si), carefully mixed in precise proportions to optimize its effectiveness across diverse industrial sectors.
• Easy-to-Handle Powder Form: The High-Purity Ferrosilicon is conveniently available in a powdered form, facilitating effortless handling, mixing, and application in various industrial processes.
• Enhancement of Steel Quality: By reducing impurities and enhancing the desired mechanical attributes, the High-Purity Ferrosilicon proves instrumental in elevating the quality and performance of steel products.
• Boosts Casting Capabilities: Introducing the High-Purity Ferrosilicon to casting alloys significantly enhances the fluidity and moldability of molten metal, resulting in improved casting performance and superior surface finishes.
• Corrosion Resistance: Steel fortified with the High-Purity Ferrosilicon exhibits remarkable resistance against corrosion, making it an ideal choice for use in severe environments.
• Augmenting Tensile Strength: Fortifying steel with the High-Purity Ferrosilicon enhances its strength, making it invaluable in applications that require high tensile strength.
• Availability in Various Sizes and Grades: The High-Purity Ferrosilicon can be sourced in different particle sizes and grades, ensuring its compatibility with individual application needs and customer specifications.

Alloy Additives

High-purity ferrosilicon is often used as alloy additives in steel smelting. Due to its high silicon content, it can effectively increase the hardness, strength and wear resistance of steel, and improve the physical and chemical properties of steel.

Cast Iron Smelting

In the cast iron smelting process, high-purity ferrosilicon can be used as a deoxidizer and alloy additive. It can effectively remove oxygen and impurities from molten iron and improve the quality and mechanical properties of castings.

Ferrosilicon Alloy Production

High-purity ferrosilicon is one of the important raw materials for the production of other ferrosilicon alloys. By mixing and alloying with other metal elements (such as manganese, chromium, etc.), a variety of ferrosilicon alloys with specific uses can be prepared, such as silicon-manganese alloys, silicon-chromium alloys, etc.

Electronics Industry

High-purity ferrosilicon is also widely used in the electronics industry. Due to its high purity and stability, it can be used to prepare semiconductor materials, electronic components and other fields that require high-purity silicon materials.

1. Our products are customer-oriented with different granularity and different chemical composition according to requirement.

2. The free samples can be supply.

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