Slag Separation Unit for Hot Metal Desulfurization

Product Specifications

Technical details and manufacturing context for Slag Separation Unit

Definition

The Slag Separation Unit is a critical component of the Integrated Hot Metal Desulfurization and Slag Treatment System. Following the injection of desulfurizing agents (typically lime-based powders) into the hot metal, this unit facilitates the physical separation of the resulting sulfur-rich slag from the purified molten iron. It ensures efficient removal of the waste slag layer, preventing recontamination of the metal and preparing the slag for subsequent cooling, granulation, or treatment processes within the integrated system. The unit operates by leveraging the difference in density and immiscibility between molten iron and slag. After desulfurization, the mixture is directed into a separation chamber or launder designed to allow the lighter slag to float to the surface. Mechanical rakes, tilting mechanisms, or weirs are then employed to skim off, drain, or divert the separated slag layer into a dedicated slag handling system, while the cleaned hot metal flows onward for further processing or casting. The unit is typically constructed with refractory lined steel to withstand high temperatures and abrasive conditions. Key parameters include a rated capacity of 100–300 t/h, separation efficiency of ≥95%, operating pressure of 1.0–1.6 MPa, operating temperature of 1200–1500 °C, sealing surface flatness ≤0.05 mm (ISO 17584), actuation time of 5–15 s, power supply of 380–480 V AC (IEC 60038), control signal of 4–20 mA (IEC 60381), ingress protection IP54–IP65 (IEC 60529), body material ZG270-500 (GB/T 11352), seat material Stellite 6 (ASTM A567), and weight of 1500–3500 kg. These values are reference ranges and must be verified for the specific model and application. The unit is designed to match upstream desulfurization throughput and ensure residual slag in hot metal below 0.5%. It is essential to confirm all specifications with the legal manufacturer or supplier before procurement.

Working Principle

The unit operates by leveraging the difference in density and immiscibility between molten iron and slag. After desulfurization, the mixture is directed into a separation chamber or launder designed to allow the lighter slag to float to the surface. Mechanical rakes, tilting mechanisms, or weirs are then employed to skim off, drain, or divert the separated slag layer into a dedicated slag handling system, while the cleaned hot metal flows onward for further processing or casting.

Common Materials

Refractory Lined Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Rated Capacity	100–300 t/h	Matches upstream desulfurization throughput
Separation Efficiency	≥95 %	Residual slag in hot metal below 0.5%
Operating Temperature	1200–1500 °C	Hot metal temperature range
Sealing Surface Flatness	≤0.05 mm	Ensures tight shut-offISO 17584
Actuation Time	5–15 s	Full open to close
Power Supply	380–480 V AC	Three-phase, 50/60 HzIEC 60038
Control Signal	4–20 mA	Analog position feedbackIEC 60381
Ingress Protection	IP54–IP65	Dust and splash water protectionIEC 60529
Body Material	ZG270-500	Cast steel for high temperatureGB/T 11352
Seat Material	Stellite 6	Wear and heat resistantASTM A567
Weight	1500–3500 kg	Depends on size and actuation

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Separation Chamber / Launder
Holds the metal-slag mixture, providing residence time and surface area for separation.

Material: Steel shell with refractory lining
Slag Skimming Mechanism
Mechanical device (e.g., rake, tilting frame) to remove the separated slag layer from the metal surface.

Material: Heat-resistant alloy steel
Slag Outlet / Chute
Channels the removed slag away from the separation unit to the slag treatment system.

Material: Refractory lined steel
Slag Weir Optional
Holds back the floating slag layer so only clean metal passes onward.

Manufacturers of Slag Separation Unit

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Frequently Asked Questions

What is the primary function of the Slag Separation Unit?

It physically separates sulfur-rich slag from desulfurized hot metal after the desulfurization process, preventing recontamination and preparing slag for further treatment.

What are the key operating parameters?

Rated capacity 100–300 t/h, separation efficiency ≥95%, operating temperature 1200–1500°C, and operating pressure 1.0–1.6 MPa. These are reference ranges; verify for your model.

What materials are used in construction?

The body is typically refractory lined steel, with body material ZG270-500 (GB/T 11352) and seat material Stellite 6 (ASTM A567). Confirm exact materials with the supplier.

How is the unit controlled?

It uses a 4–20 mA control signal (IEC 60381) and has an actuation time of 5–15 seconds. Power supply is 380–480 V AC (IEC 60038). Verify compatibility with your system.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 0.5 bar gauge (minimal pressure differential)
flow rate:	50-500 tons/hour (hot metal throughput)
temperature:	1300-1600°C (hot metal processing range)
slag concentration:	5-25% by volume in metal stream

Slag Separation Unit

Product Specifications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards