Steel Desulfurization Process

The world's leading calcium carbide supplier.

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Desulfurization

Desulfurization Principle: CaC₂ + S → CaS + C

Deoxidation Principle:CaC₂ + O₂ → CaO + CO₂

Function:

In the steelmaking process, calcium carbide is used to remove sulfur from molten steel, reduce oxygen content, improve the toughness and strength of the steel, and enhance the overall quality of the steel.

Applications:

The amount of calcium carbide used for desulfurization is typically 5-10 kg per ton of steel.

The amount of calcium carbide used for deoxidation is usually 2-6 kg per ton of steel.

Calcium carbide is widely used in electric arc furnaces and converter steelmaking processes, producing various types of carbon steel, alloy steel, special nitrided steel, and other steel grades.

Desulfurization Process

Calcium carbide can be introduced into molten steel in the form of blocks, powder, or granules. There are mainly two methods for desulfurizing molten steel: blowing and stirring.

Blowing involves uniformly spraying calcium carbide powder into molten steel using a blowing device. This method excels in desulfurization efficiency and uniform mixing, making it suitable for applications demanding high desulfurization effectiveness.

On the other hand, stirring directly adds calcium carbide material into the molten steel, utilizing mechanical equipment to mix the steel and calcium carbide. This method is simpler and more flexible, suitable for production environments of various scales.

The choice of desulfurization method typically depends on specific production needs, cost considerations, and equipment conditions.

TYWH Solutions

Different calcium carbide particle sizes affect the speed and efficiency of desulfurization reaction

We provide customized calcium carbide particle size services. Through advanced crushing and screening technology, we can customize the calcium carbide particle size that best suits customers' production needs. The optimized calcium carbide particle size can significantly improve the uniformity and efficiency of the desulfurization reaction while reducing the required amount of calcium carbide.

Treatment of by-product CaS

We maintain close cooperation with calcium sulfide curing agent suppliers and can provide customers with customized curing agent options. By mixing calcium sulfide with an appropriate curing agent to form a stable solid block, it can effectively reduce its potential impact on the environment and effectively assist customers in completing the treatment of calcium sulfide by-products.

Unstable supply of calcium carbide

We have established good cooperative relationships with a number of high-quality raw material suppliers to ensure stable supply, reasonable prices and excellent quality. At the same time, our annual production capacity reaches 120,000 tons, which can ensure production capacity and supply stability. With stable raw material supply and high production capacity, we provide customers with reliable calcium carbide supply.

Common Challenges in Steel Desulfurization

Calcium Carbide Quality Issues

Excessive impurities in calcium carbide, such as phosphorus and sulfur, can adversely affect the desulfurization effectiveness, leading to the production of unnecessary by-products and increased production costs. Additionally, uneven particle sizes of calcium carbide can impact reaction rates and desulfurization efficiency, resulting in unstable desulfurization effects.

Reaction Control Issues

The reaction between calcium carbide and sulfur is exothermic. Improper design or operation of cooling systems can result in excessively high temperatures, posing safety hazards or causing the reaction to become uncontrollable. Additionally, both excessively fast or slow reaction rates can lead to inadequate desulfurization effects, affecting production efficiency and product quality.

Equipment Corrosion and Blockage

During the desulfurization process, the generated calcium sulfide and other by-products can corrode and wear down equipment. These by-products can also deposit inside pipelines and equipment, leading to blockages that disrupt production continuity and increase maintenance and replacement costs.

Handling of By-Products

The by-products generated during the reaction, such as calcium sulfide, need to be properly managed. Improper handling can lead to environmental pollution.

Safety Hazards

The desulfurization process involves high temperatures and chemical reactions, necessitating strict safety procedures and training to prevent operational errors that could lead to safety accidents.

LEADING STEEL MANUFACTURERS TOWARD A CIRCULAR ECONOMY WITH CARBIDE TECHNOLOGY

A New Era of Green Desulfurization

In the journey to revolutionize the green steel manufacturing industry, we use innovative carbide technology as the key to unlocking new doors for efficient desulfurization and resource recycling. We invite you to contact us to explore more about how we can work together with our clients to build a green future for the steel industry.

TIps：Based on customer confidentiality agreements, the company name mentioned is pseudonyms.

Background Challenges

DEF Company is committed to the dual goals of improving steelmaking quality and environmental protection. However, under traditional desulfurization processes, efficiency is low, and the handling of carbide sludge by-products has become an environmental bottleneck.

Innovative Practice

We have tailored a carbide desulfurization solution for DEF. Leveraging the high-efficiency desulfurization performance of carbide, the desulfurization efficiency has been significantly improved by 25%. Additionally, we introduced carbide sludge recycling technology, transforming what was once considered waste into building materials and chemical raw materials, achieving a remarkable transition from "waste" to "resource."

Significant Results

Following implementation, DEF has not only greatly reduced sulfur emissions, thereby minimizing environmental pollution, but has also opened new revenue streams through the reuse of carbide sludge. This innovative practice represents a successful shift for DEF towards a circular economy model, yielding both economic and environmental benefits.

Customer Testimonial

"Partnering with XX Carbide has been a significant milestone for DEF on our path to sustainable development. Their solutions have not only addressed our practical challenges but also set a green benchmark in our industry." — CEO of DEF Company

Customer Case

Background

A Japanese steelmaking company faced a significant challenge with the unstable supply of calcium carbide particles smaller than 15mm, leading to production interruptions.

Solution and Results

To address the issue of low output ratio for particles smaller than 15mm, we provided a solution with a 5% higher output ratio compared to industry standards. Leveraging our 8 automated production lines and large-scale manufacturing capacity, we ensured accurate particle size and stable production. This solution achieved 100% production stability for the client and improved desulfurization efficiency by 20%. The client not only stabilized production but also reduced costs and increased benefits. By choosing our professional services and customized solutions, you will gain a reliable partner and achieve mutual success.

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