CHNZBTECH

Located in XI 'AN, China, formerly known as Xi'an Zebang Industrial Co., Ltd, which is a subsidiary of China National Heavy Machinery Research Institute (SINO-HEAVYMACH), in 2019, due to the restructuring of (SINO-HEAVYMACH), ZBTECH (Xi'an Zebang Electric Furnace Co., Ltd) was established to operate independently. Certified by ISO9001, ZBTECH adheres to the serious and rigorous design concept of SINO-HEAVYMACH, which is a technology-oriented enterprise providing complete steelmaking & ferroalloy equipment for domestic and overseas industry. ZBTECH covers design, manufacturing, erection, and commissions special for steel-making equipment like EAF, LRF, VD/VOD. Ferroalloy furnace, integrated revamping and upgrading of existing plants, which is one of few recognized in the sector for its excellence and commitment to technological innovations.   https://www.zbmetaltech.com/

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Secondary Refining Furnace

Unlock the Secrets of High-Quality Metal Refining with CHNZBTECH! Find the Best Cupellation Furnace Price & Trust the Leading Secondary Refi

The steel refining process by secondary refining furnace can be divided into two categories: primary refining, aimed at removing carbon from pig iron, and additional refining processes conducted after primary refining, collectively referred to as secondary refining. Secondary refining furnace process involves the removal of impurities and adjustment of elements. The secondary refining usually takes place in a ladle (a transport container for molten steel) and is crucial for producing high-quality steel. The primary role of secondary refining is ultimate desulfurization, the elimination of oxygen, nitrogen, hydrogen, and other impurities, as well as the final decarburization of ultra-low carbon steel.

A steel melting and secondary refining method comprising the steps of melting steel manufacture raw materials while the molten steel is subjected to oxidation and decarburization so that the oxidation and decarburization are substantially completed before melt-down; after melt-down, heating the molten steel to a temperature above a liquidus line temperature and below 50℃. in temperature increment from the liquidus line temperature, and thereafter tapping the molten steel into a primary ladle; teeming the molten steel from the primary ladle into a secondary refining furnace; allowing the molten steel to be effluent into a secondary ladle at a lower portion of the secondary refining furnace while the temperature of the molten steel is raised; and continuously performing gas bubbling in the secondary ladle in a vacuum under existence of slag simultaneously with the effluence of the molten steel into the secondary ladle.

TYPES OF SECONDARY REFINING FURNACE

In the realm of steel production, the Secondary Refining Furnace stands as a pivotal player in achieving exceptional steel purity and quality. This crucial phase of the secondary metallurgy steelmaking process encompasses various techniques aimed at fine-tuning the composition of the molten metal, eliminating impurities, and ensuring the final product meets the stringent demands of modern industries.

WHAT ARE THE FUNCTIONS OF VARIOUS SECONDARY REFINING FURNACES?

Advantages of ladle refining furnace in alloy steel secondary refining

Enhancing Steel Quality through ESR Process

Stainless steel refining: AOD and VOD furnace

Advantages of ladle refining furnace in alloy steel secondary refining

Ladle refining furnace offers strong heating functions, permits the addition of a large amount of alloys, and enables precise temperature control. The ladle secondary refining furnace also provides outstanding desulfurization by high-temperature treatment with reducing fluxes and the removal of deoxidation products. The LRF process is therefore often used for the secondary refining process of alloy steel.

THE PIVOTAL ROLE OF SECONDARY REFINING FURNACES-SHAPING MODERN STEEL EXCELLENCE

THE PIVOTAL ROLE OF SECONDARY REFINING FURNACES-SHAPING MODERN STEEL EXCELLENCE

Secondary refining aims to fine-tune the steel's properties, ensuring the secondary refining process meets the stringent requirements of various industries, including automotive, construction, aerospace, and more.

Purity Enhancement: Steel produced in primary furnaces can still contain impurities and non-metallic inclusions that might adversely affect its mechanical properties, formability, and overall quality. Secondary refining furnaces, such as ladle furnaces or vacuum degassing units, focus on reducing these impurities to enhance the steel's purity. Through secondary refining processes like desulfurization and deoxidation, excess sulfur and oxygen are removed, leading to cleaner and more refined steel.

Composition Adjustment: Steel's composition can significantly impact its performance in various applications. Secondary refining furnaces provide a controlled environment for adjusting the composition of steel by adding precise amounts of alloying elements. This secondary metallurgy steelmaking process allows steelmakers to achieve specific mechanical properties, corrosion resistance, and other characteristics required for specific applications.

Refining Quality: The secondary refining process involves precise temperature and chemical control, which aids in the removal of undesirable elements and compounds that could compromise the steel's quality. By utilizing techniques like argon or vacuum degassing, hydrogen removal, and slag foaming, steelmakers can achieve higher levels of cleanliness and homogeneity in the final product. This contributes to improved mechanical properties, surface finish, and overall quality.

FAQS ABOUT SECONDARY REFINING FURNACE

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HOW DOES A SECONDARY REFINING FURNACE ENHANCE THE PURITY OF STEEL?

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Secondary refining furnaces employ various processes to enhance the purity of steel. Through the flow of molten steel, these furnaces can remove excess sulfur, oxygen, and other impurities using techniques such as blowing, injection, or vacuum treatment. This treatment significantly reduces the content of non-metallic inclusions and impurities, resulting in cleaner and higher purity steel.

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HOW DO SECONDARY REFINING FURNACES CONTRIBUTE TO ENVIRONMENTAL SUSTAINABILITY?

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Modern secondary refining furnaces also take environmental factors into consideration. They utilize technologies such as slag recycling and waste heat utilization to reduce waste generation, energy consumption, and emissions. These measures contribute to achieving sustainable steel production and reducing the environmental impact.

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HOW DO SECONDARY REFINING FURNACES ADJUST THE COMPOSITION OF STEEL TO MEET SPECIFIC REQUIREMENTS?

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Secondary refining furnaces adjust the composition of steel by adding alloying elements to meet specific requirements. Steel producers can precisely control the amount of alloying elements added, thus achieving specific properties and characteristics in the steel, such as corrosion resistance, thermal conductivity, hardness, etc. This enables steel to be tailored for various application domains.

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SCRAP BUCKET

Revolutionize Your Scrap Collection with CHNZBTECH - The Leading Scrap Bucket Manufacturer. Discover the Ultimate Storage Solution for Unwan

In steelmaking equipment, the scrap bucket is a device for loading scrap steel, used to inject scrap steel into the steelmaking furnace. The steel bucket mainly has two types: bottom opening feeding and mouth dumping feeding.

USES

SCRAP CHARGING BUCKETS USES

Scrap charging buckets are used for top loading electric arc furnaces from top -which are designed for an even spread of scrap over the bed of the furnace. Constructed of heavy steel plate, bars and rolled shapes. Bottom doors, fabricated of dished plate are waffled for added strength and allow the bucket to sit on the floor without special auxiliary supports. Cylinder body of rolled plate is welded inside and out. Main bails are of heavy duty construction or for long life - ease of operation. A spreader beam type auxiliary bail and guides, keep the door operating cables from wearing against the bucket.

FEATURES

SCRAP BUCKET FEATURES

Scrap Bucket Features

The scrap bucket bottom usually is a clam shell design-i.e. the bucket opens up by retracting two segments on thebottom of the bucket.Some large-tonnage bottom-opening scrap baskets do not match the ferroalloy melting fumace incaliber, resulting in more material perpendicular to the opening direction and uneven fabric. Uneven fabric sometimescauses scrap to stick to the lining, affecting the life of the lining; sometimes it will cause the scrap to fall on the under-railrail, affecting the normal operation of the under-vehicle, increasing the workload of the operator.

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OXYGEN LANCE MANIPULATOR

Unlock the Secrets of Oxygen Lance Manipulators | Find the Perfect Lance Manipulator for Your Needs | Exclusive Guide at CHNZBTECH! Upgrade

The carbon oxygen lance mainly refers to the EAF smelting, generally referring to the carbon oxygen lance at the EAF furnace door, as well as the furnace wall carbon oxygen burners also called KT lance. The furnace door carbon oxygen manipulator is equipped with two water-cooled nozzles, some with two water-cooled oxygen lances, and some with combination oxygen lance.

The former consists of two oxygen lances arranged around, one is a Laval supersonic oxygen lance and the other is a carbon lance used for direct hole carbon powder spraying; The latter is equipped with two spray lance arranged above and below the overall lance, with a supersonic oxygen lance below, which is also a Laval nozzle, and a carbon lance above.

ADVANTAGES

OXYGEN LANCE MANIPULATOR ADVANTAGES

Oxygen Lance Manipulator Advantages

During smelting, the spray lance inside the furnace door gradually inserts into the furnace as the scrap steel melts. Compared with traditional smelting processes, the use of EAF carbon oxygen lance has the following advantages:

The furnace door carbon oxygen lance injects oxygen into the molten pool at Mach 2 supersonic speed, which changes the Chemical equilibrium in the molten pool and greatly increases the amount of CO in the molten pool.

The whole process of foam slag smelting, due to the participation of carbon injection, the conditions for the whole process of foam slag smelting are improved, the splash is reduced, the power utilization rate is increased, the noise is reduced, and the quality is improved;

As the temperature of the flue gas increases, sufficient oxygen reacts with carbon. Compared with traditional systems, free oxygen is used for CO combustion during decarbonization, resulting in a weaker oxidizing atmosphere in the furnace, reducing electrode and refractory consumption.

WHY

WHY SUCH LANCE SYSTEM IS NEEDED?

Carbon removal.

Promotion reduction reaction.

Slag forming.

Horizontal stirring of liquid bath.

Remote control.

Optimal height (up and down) adjustment for different process stages.

Increase of oxygen efficiency and productivity.

Increase of chemical reaction to speed up liquid melting down.

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Furnace Auxiliary Equipment

Find the Best Steel Mill Equipment Manufacturer for Metallurgical Furnace Auxiliary Equipment! Uncover Top-Notch Steel Making Machines & Com

Steelmaking is a continuous process. The meltshop is a hazardous environment, filled with intense heat, suffocating dust, glowing metal, and open flames. Auxiliary machines are equipment or devices that support and facilitate the various processes involved in steel production. These machines play a crucial role in ensuring the efficiency, safety, and quality of the steelmaking process.

TYPES OF FURNACE AUXILIARY EQUIPMENT

The specific auxiliary machines used in a meltshop can vary based on the size of the facility, the steelmaking processes employed, and the level of automation and technology used. Here are some common auxiliary equipment.

HOW TO ENHANCING STEELMAKING EFFICIENCY AND SAFETY

Crucial Support for Steel Production

Taming the Hazardous Environment

Advancing Innovation and Sustainability

Crucial Support for Steel Production

Auxiliary machines in the meltshop, including electric arc furnaces and ladle refining furnaces, play a pivotal role in refining raw materials. These machines ensure the quality, composition, and temperature of molten steel, leading to superior end products.

MELTSHOP AUXILIARY MACHINES: ENHANCING PRODUCTION AND ENSURING SAFETY

Meltshop auxiliary machines are vital components within the steel manufacturing process. These machines, ranging from electric arc furnaces and ladle refining equipment to continuous casting machines, play a crucial role in refining raw materials and controlling steel properties. By meticulously managing factors such as composition and temperature, these devices contribute to the production of high-quality end products.

However, the meltshop environment is fraught with hazards, including extreme heat, swirling dust, molten metal, and open flames. Consequently, cooling water systems, dust collection units, and other safety measures are indispensable in minimizing risks and optimizing production processes.

With advancements in technology, innovative auxiliary machines like continuous casting systems and vacuum degassing units not only enhance steel quality but also promote sustainable practices by minimizing waste and energy consumption. As stewards of quality and safety, meltshop auxiliary machines remain pivotal in shaping the steel industry's future.

FAQS OF MELTSHOP AUXILIARY MACHINE

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HOW DO MELTSHOP AUXILIARY MACHINES CONTRIBUTE TO SUSTAINABILITY?

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Innovative auxiliary machines like continuous casting systems and vacuum degassing units contribute to the steel industry's sustainability by reducing waste generation and energy consumption. These machines enhance production efficiency and product quality while minimizing environmental impacts, pushing the industry towards a more environmentally-friendly direction.

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WHAT ARE MELTSHOP AUXILIARY MACHINES?

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Meltshop auxiliary machines are machinery and equipment that support and facilitate various processes in the steel production industry. They include electric arc furnaces, continuous casting machines, vacuum degassing units, among others. These machines optimize steel production processes, improve product quality, and ensure employee safety.

WHAT ROLES DO THESE MACHINES PLAY IN THE STEELMAKING PROCESS?

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Meltshop auxiliary machines play crucial roles in refining raw materials, adjusting alloy compositions, and controlling steel temperature. For instance, electric arc furnaces melt scrap metal, continuous casting machines shape molten steel into continuous billets, and vacuum degassing units remove gas impurities from the molten steel.

IS THE ENVIRONMENT IN THE MELTSHOP HAZARDOUS?

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Yes, the meltshop environment is filled with high temperatures, molten metal, swirling dust, and open flames. These factors pose potential risks and hazards to workers. Thus, equipment like cooling water systems and dust collection units are crucial for ensuring safety in the workplace.

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LRF LADLE REFINING FURNACE

Unlock the Secrets of Ladle Refining Furnace - Boost Steel Quality & Production! Experience the Power of CHNZBTECH's Industrial LRF Ladle Re

LRF ladle refining furnace is the most widely used refining equipment outside the furnace at present. The LRF furnace is used to refine the molten steel melted in the primary furnace, and can adjust the molten steel temperature and buffer the process.

The ladle furnace refining equipment has many advantages, such as reasonable equipment structure, reliable operation, low cost, many refined steel types, high quality and convenient operation.

FUNCTIONS

CONDITIONS AND FUNCTIONS OF LRF IN STEEL MAKING

 The LF furnace specification is from 8t to 300t, and has the following conditions and functions:

The working conditions in the LRF steel making furnace are reducing atmosphere and micro positive pressure;    

The electrode adjustment mode of the ladle refining furnace is three arm three-phase electrode adjustment;    

The thermodynamic condition of the ladle heating furnace is graphite electrode arc heating;

The dynamic condition is argon stirring at the bottom of the ladle;

Add a certain amount of scrap crushing material into the ladle, heat it up with electric arc, measure the temperature and take samples to make the temperature control accurate, so as to optimize the pouring temperature;

Bottom blowing argon stirring to make the temperature of molten steel uniform, the composition uniform and the molten steel pure;

Slagging to remove sulfur and inclusions in molten steel;

Adjust the alloy composition and use the alloy feeding system to make the composition control accurate and the molten steel meet the final required chemical composition;

Wire feeding treatment: directly feed various wires into molten steel with a wire feeder, which can significantly improve the yield of alloy;

Smoke exhaust and dust removal. Equipped with a smoke exhaust and dust removal system, it can effectively control the smoke discharge and make the smoke emission meet the requirements of environmental protection;

As the ladle refining equipment outside the ladle arc furnace between the primary refining furnace and the continuous caster, it plays a buffer and regulating role in the production process of the whole workshop to ensure that molten steel with qualified temperature and composition is provided to the continuous caster.

STRENGH

LRF LADLE REFINING FURNACE FEATURES

LRF Ladle Refining Furnace Features

The features of the LRF furnace are as follow:

Electrode rotation dual station;

Ladle turret dual station technology;

Online wire feeding technology;

Automatic temperature measurement and sampling technology;

The technology of adding scrap steel to refining furnace;

Argon blowing automatic control technology;

LF one touch steelmaking technology.

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LOW CARBON FERROCHROME FURNACE

Unleash the Power of Low Carbon Ferrochrome Furnaces! Dive into the World of Submerged Arc Furnaces for Fantastic Ferrochrome Production - E

The main raw materials for smelting low-carbon ferrochromium using the electro silicothermic method include chromium ore, silicon chromium alloy, and lime. Some also come with fluorite and iron scales.

Chromium ore should be a dry, clean lump or concentrate with a lump size of less than 50mm; Containing Cr2O3>40%, Cr2O3/ Σ FeO>2.0, phosphorus content should not exceed 0.03%. Select silicon chromium alloys with different carbon contents based on the grade of the micro carbon engraved iron smelted. When smelting low-carbon iron with a carbon content of 0.06%, the carbon content of silicon chromium alloy should be less than 0.06%; When smelting low-carbon ferrochromium with a carbon content of 0.03%, the carbon content of the silicon chromium alloy should be less than 0.03%. Silicon chromium alloy shall not contain slag, and the block size shall not exceed 15mm. Fragments less than 1mm shall be sieved out. Lime requires a CaO content greater than 88% and a phosphorus content less than 0.02%. Newly burned lime with a block size of 10-50mm should be used.

FEATURES

CHNZBTECH TECHNOLOGY FOR A MATURE 4000KVA FURNACE

CHNZBTECH Technology for a Mature 4000KVA Furnace

Productivity：35t/day;

Cooling water consumption: 150m³ / h, cooling water can be recycled,

Secondary current: 10500A,

4000KVA LCFC furnace fume amount: 90000m³/h, bag filter recommended;

HP electrode 400mm, consumption of each ton of alloy electrode is 16-18 kg.

Ton products raw material chrome ore 1.35t, siliconchrome 0.56t, lime 1.20t

Power consumption：2200-2800KW.H/t, depends on melting process;

SPECIFICATIONS

LOW CARBON FERROCHROME FURNACE SPECIFICATIONS

Grades and ingredients of some products in China

C

Grade

Chemical  %

Cr

C

Si

P

S

Range

Ⅰ

Ⅱ

Ⅰ

Ⅱ

Ⅰ

Ⅱ

Ⅰ

Ⅱ

≥

≤

micro

FeCr65 C0.03

63.0～75.0

0.03

1.0

0.03

0.025

FeCr55 C0.03

60.0

52.0

0.03

1.5

2.0

0.03

0.04

0.03

FeCr65 C0.06

63.0～75.0

0.06

1.0

0.03

0.025

FeCr55 C0.06

60.0

52.0

0.06

1.5

2.0

0.04

0.06

0.03

FeCr65 C0.1

63.0～75.0

0.10

1.0

0.03

0.025

FeCr55 C0.1

60.0

52.0

0.10

1.5

2.0

0.04

0.06

0.03

FeCr65 C0.15

63.0～75.0

0.15

1.0

0.03

0.025

FeCr55 C0.15

60.0

52.0

0.15

1.5

2.0

0.04

0.06

0.03

Low

FeCr65 C0.25

63.0～75.0

0.25

1.5

0.03

0.025

FeCr55 C0.25

60.0

52.0

0.25

2.0

3.0

0.04

0.06

0.03

0.05

FeCr65 C0.5

63.0～75.0

0.5

1.5

0.03

0.025

FeCr55 C0.5

60.0

52.0

0.5

2.0

3.0

0.04

0.06

0.03

0.05

4000KVA Furnace for LCFC furnace

No.

Item

Unit

Data

Remark

1

TR capacity

KVA

4000

3phase

Power factor

Cos

≮0.9

2

End products

LCFC

Low, micro

3

TPD

t

35

4

Tapping time

d

10

5

Max tapping

t

3.5

6

Electrode

Graphite

HP

7

Electrode diameter

mm

400

8

Water

M³/h

150

Circulation water

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LADLE PRE-HEATER

Get ready to revolutionize your ladle pre-heating process with CHNZBTECH's Vertical Ladle Pre-Heater Burners System. Achieve optimal tempera

Preheaters are suitable for different types of gas or liquid fuels. Such as blast furnace gas, mixed gas, natural gas, propane, acetylene, etc. According to the combustion medium situation of the user, fuel parameters are provided by the user, and different forms of baking devices are designed to ensure the combustion effect.

APPLICATION

LADLE PREHEATER APPLICATION

Used for on line (off line) baking of steel (iron) ladle and continuous casting tundish, including fast or slow drying of newly built ladle and turnover ladle. Fast baking of online steel ladle or tundish. The baking temperature reaches around 1000 degrees.

CHARACTERISTICS

LADLE PREHEATER PERFORMANCE CHARACTERISTICS

The series of steel (iron) ladle baking machines produced by our factory are divided into two forms: vertical and horizontal. Vertical type is divided into online gantry type and offline flipping type, consisting of three parts: mechanical structure, ignition system, and control system.

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LADLE FURNACE ROOFING

Boost Efficiency & Safety with Ladle Furnace Roofing | CHNZBTECH. Discover the Ultimate Solution for Furnace Exhaust on Roof & Achieve Optim

LF roofing is round-shaped and has a tube-type water-cooled structure. It is divided into a large furnace roof, a small ramming roof, an offgas exhaust hood, and is provided with an operation door and an alloy addition orifice.

CHARACTERISTICS

LF ROOFING CHARACTERISTICS

Water-cooled furnace roof have the following characteristics:

1. Minimize contact between air and molten steel in the atmospheric environment

Hanging slag or cold steel on the edge of the ladle does not affect the performance of the furnace.

DESCRIPTIONS

LADLE FURNACE ROOFING DESCRIPTIONS

A roof for a metallurgical ladle/furnace (L.A.F) comprising a self-supporting structure of metallic pipework defining at least one flow circuit for cooling water, with a lower end having a circular peripheral flange (A), with a cylindrical body member of smaller diameter than the flange (A) located above the flange (A) (in use away from the ladle/furnace), and is provided with an end wall having a plurality of apertures each to receive, in a gas-tight manner, a carbon electrode, and an aperture for fume extraction provided in the arcuate wall of the cylindrical body member.