High Calcium Quicklime

Our high calcium quicklime is a key component in the steelmaking processes like in Basic Oxygen Furnace (BOF), Electric Arc Furnace (EAF), and in stainless steelmaking processes as a fluxing agent to achieve proper slag chemistry and physical properties. It is also a key material for slagmaking in secondary metallurgy. It is used to refine, desulfurize, and control inclusions in the steel bath and in the argon oxygen decarburization furnace (AOD) to maintain chrome recovery. Quality high calcium lime is critical to producing quality steel and control of steelmaking process cost.

10.000.000

tons of steel / a year

satisfied clients

years of expertise

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Key Considerations

High reactivity soft burnt quicklime with high calcium content guarantees fast dissolution in the slag.
Optimizes chemistry of slag in the best cost-effective way.
Removes impurities in steel such as phosphorus and silica or sulphur.
Creates and maintains proper viscosity of the slag to increase heat and metallic yields.
Supports slag foaming in EAF throughout the heat.
Prevents nitrogen and hydrogen pickup, especially at refining step.
Reduces energy costs by insulating the bath.
Lime handling to prevent fines generation.
Lime injection in EAF to further control lime activity and slag foaming.

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Your Benefits

INDUSTRIES

ON TIME IN FULL (OTIF): delivered on time in quality and quantity
Security of supply: secured and reserved capacity
Total Cost of Ownership (TCO) Reduction: supporting optimal use of the product

CUSTOMER INTELLIGENCE

Product quality: the best suiting product for your need
Value-added products
Independence from the raw material availability

PARTNERSHIP

Secured supply
Long-term contract
High value in use

More Information

Several needs should be taken into consideration when selecting the right product for your BOF steelmaking needs:

Slag chemistry
Phosphorus levels
Oxidation requirements
Sulphur content in hot metal

Several needs should be taken into consideration when selecting the right product for your EAF steelmaking needs:

Slag chemistry
Nitrogen and hydrogen levels in the steel
Oxidation requirements

Several needs should be taken into consideration when selecting the right product for your stainless steel needs:

Slag chemistry
De-oxidation and desulfurization practices in the secondary metallurgy treatments
Carbon content of fluxes

BOF:

Integrated steel mills are very complex and small changes could make huge impact.
Soft burnt lime having a large specific surface and good reactivity is critical to dephosphorization.
Higher quality lime facilitates lower consumption of lime and improvement in steel melt shop productivity.

EAF:

Foaming slag is critical to EAF process for productivity, refractories, electrodes.
Foaminess also helps in improving chromium recovery, in case of stainless-steel melting.
CO and CO₂ gas helps to foam, and slag composition is critical to maintain foaminess.

Several needs should be taken into consideration when selecting the right product for your secondary metallurgy needs:

Slag chemistry
Sulphur content in steel
Oxidation requirements

Process step	Critical parameters	Typical consumption (kg/ton of steel)
Steelmaking (BOF)	1. Quality level and consistency 2. Reactivity 3. Lower fines	Calcitic Quicklime 40-70
Steelmaking (EAF)	1. Quality level and consistency 2. Lower fines for lump lime 3. Flowability for injection	Calcitic Quicklime 10-50
Secondary metallurgy Ladle Refining Furnace (LRF) Argon Oxygen Decarburization (AOD)	1. Quality level and consistency 2. Reactivity 3. Low impurities (e.g. S, H₂O) 4. Low carbon for AOD	Calcitic Quicklime 5-10

FAQ

What is high calcium quicklime?

Quicklime with a high calcium content has a much higher calcium to magnesium ratio, with a magnesium content of less than 5%. High calcium lime to be used in steel has also low levels of impurity and high reactivity.

What are the benefits of high calcium quicklime?

High calcium quicklime is bringing more of an active component to the medium, lowering amount of incorporated impurities and reduces slag amount and metallic losses. It optimizes chemistry of the slag, removing impurities like sulphur, phosphorus, carbonates, manganese, etc. from the bath to improve steel quality. It also maintains the viscosity of the slag to increase heat and metallic yields.

How can soft burnt lime improve steelmaking process?

Usage of soft burnt high calcium quicklime with high specific surface leads to a rapid generation of the primary slag increasing the efficiency of dephosphorization reaction.

High Calcium Quicklime

Key Considerations