Editorial Technical Reference

Slag Separation Unit

This page explains how Slag Separation Unit is classified within Basic Metal Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A component within the Integrated Hot Metal Desulfurization and Slag Treatment System that physically separates molten slag from desulfurized hot metal after the desulfurization process.

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Slag Separation Unit in a manufacturing environment
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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
ParameterTypical rangeNotes & selection driver
Rated Capacity100–300 t/hMatches upstream desulfurization throughput
Separation Efficiency≥95 %Residual slag in hot metal below 0.5%
Operating Temperature1200–1500 °CHot metal temperature range
Sealing Surface Flatness≤0.05 mmEnsures tight shut-offISO 17584
Actuation Time5–15 sFull open to close
Power Supply380–480 V ACThree-phase, 50/60 HzIEC 60038
Control Signal4–20 mAAnalog position feedbackIEC 60381
Ingress ProtectionIP54–IP65Dust and splash water protectionIEC 60529
Body MaterialZG270-500Cast steel for high temperatureGB/T 11352
Seat MaterialStellite 6Wear and heat resistantASTM A567
Weight1500–3500 kgDepends 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.

Application & selection

Application Fit & Sizing Matrix

Operational Limits
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
Media Compatibility
✓ Molten iron with calcium-based desulfurization slag ✓ Hot metal with magnesium-based treatment residues ✓ Steelmaking slags containing CaO-SiO2-Al2O3 systems
Unsuitable: Chloride-containing slags or environments (causes severe refractory corrosion)
Sizing Data Required
  • Hot metal throughput rate (tons/hour)
  • Required slag removal efficiency (%)
  • Available installation footprint (length × width)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Abrasive wear of separation plates/screens
Cause: Continuous exposure to high-velocity slag particles with varying hardness and sharp edges, leading to material degradation and loss of separation efficiency.
Thermal fatigue cracking in structural components
Cause: Cyclic thermal stresses from repeated heating/cooling cycles during slag processing, combined with mechanical loading, causing crack initiation and propagation.
Maintenance Indicators
  • Unusual vibration or grinding noises from the separation chamber, indicating component wear or imbalance
  • Visible slag leakage or bypass around separation elements, suggesting seal failure or structural compromise
Engineering Tips
  • Implement real-time particle size monitoring and adjust feed rates to prevent oversize particles from accelerating abrasive wear
  • Apply thermal barrier coatings on critical structural components and establish controlled cooling procedures to minimize thermal cycling stresses

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM E94 Standard Guide for Radiographic Testing CE Machinery Directive 2006/42/EC

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.05mm
  • Surface Flatness: 0.15mm per meter
Quality Inspection
  • Ultrasonic Thickness Testing
  • Hardness Testing (Rockwell C Scale)
Technical documentation
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Manufacturing capability
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Inspection readiness
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Supplier transparency
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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. See the editorial policy.

Related equipment

Industrial Ecosystem & Supply Chain Structure

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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