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Calcium ferrite

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[Application range]:

【product description】:

Definition of calcium ferrite:
Calcium ferrite, also known as pre-melting steelmaking slagging agent, provides better slagging conditions for steelmaking. As the slag conditions are improved, the use efficiency of lime is improved, which can save lime consumption.
Brief introduction of calcium ferrite:
The formation characteristics of calcium ferrite of iron ore is a factor that must be considered in sintering and blending, and has an important guiding role in optimizing the blending. To this end, the micro-sintering test method and mineral composition and microstructure analysis methods were used to study the characteristics of calcium ferrite sintering of 10 kinds of iron ore. Under the same conditions and other conditions, the loose structure of limonite, hematite and higher contents of A12O3 and SiO2 are conducive to the formation of SFCA. ...

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Definition of calcium ferrite:
Calcium ferrite, also known as pre-melting steelmaking slagging agent, provides better slagging conditions for steelmaking. As the slag conditions are improved, the use efficiency of lime is improved, which can save lime consumption.
Brief introduction of calcium ferrite:
The formation characteristics of calcium ferrite of iron ore is a factor that must be considered in sintering and blending, and has an important guiding role in optimizing the blending. To this end, the micro-sintering test method and mineral composition and microstructure analysis methods were used to study the characteristics of calcium ferrite sintering of 10 iron ore sintering. The main factors affecting the calcium ferrite generation were found, that is, the alkalinity was 2.0. Under the same conditions and other conditions, the loose structure of limonite, hematite and higher contents of A12O3 and SiO2 are conducive to the formation of SFCA.

Application range

Calcium ferrite properties
1. Fast slag formation. Due to pre-melting, a low-melting point mixture has been formed, and the liquid is quickly formed in the furnace to achieve the purpose of slagging in the initial stage of smelting. After the pre-melted steelmaking slag-forming agent (calcium ferrite) is added to form a liquid slag, the active lime added thereafter has a large contact surface in the liquid slag and is easy to dissolve. At the same time, the pre-melted steelmaking slag-making agent (ferric acid) is added. Calcium) has higher iron oxide which can quickly lower the melting point of calcium oxide, and promote the rapid dissolution of lime. Provide better slagging conditions for steelmaking. As the slag conditions are improved, the use efficiency of lime is improved, which can save lime consumption.
2. Due to the good slag, good dephosphorization conditions have been created in the furnace. To achieve the purpose of early dephosphorization, increase the dephosphorization rate by 3 ~ 5%.
3. After using the pre-melted slag, the end carbon content and the temperature of the molten pool are both higher than the average value, indicating that the heat recovery rate is increased and the molten steel will not be excessively oxidized, which is beneficial to improve the quality of the steel.
4. Premelted steelmaking slag-making agent (calcium ferrite) can accelerate the dissolution of lime, so there is no need to use fluorite for fluxing to achieve fluorine-free steelmaking; furnace lining erosion is reduced, and environmental pollution is reduced.
5. As the slag is good, the smelting is stable, and the molten steel splash is reduced, the liquid steel yield can be improved by about 1%.
6. The smelting cycle is shortened. Fast slag reduction and efficient dephosphorization rate can shorten smelting time.

Production Process

Due to pre-melting, a low-melting point mixture has been formed, and the liquid is quickly formed in the furnace to achieve the purpose of slagging in the initial stage of smelting. After the pre-melted steelmaking slag-forming agent (calcium ferrite) is added to form a liquid slag, the active lime added thereafter has a large contact surface in the liquid slag and is easy to dissolve. At the same time, the pre-melted steelmaking slag-making agent (ferric acid) Calcium) has higher iron oxide which can quickly lower the melting point of calcium oxide, and promote the rapid dissolution of lime.

Technical Parameters

Chemical index:

Chemical index:
model Fe2O3 CaO SiO2 Al2O3
RS-1 ≥55% ≥30% ≤5% ≤4%
RS-2 ≥50% ≥35% ≤5% ≤4%

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