GGBFS & Steel Slag Powder Production Line

Complete Slag Grinding Plant Solutions – Maximize S95/S105 Reactivity, Minimize Power Cost Turnkey slag powder production lines from 100,000 to 1,000,000 TPY. Our integrated vertical roller mill or roller press + ball mill systems deliver GGBFS with Blaine fineness 400-600 m²/kg and 7-day activity index ≥95%, while keeping total system power consumption at 35-42 kW·h/t. Whether processing granulated blast furnace slag, steel slag, or nickel slag, we provide full EPC services from wet slag handling to finished powder silo.

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Pain Points & Solutions Applicable Material Process Technical Specifications Proven Performance Quality FAQ Contact Us Related Cases

Pain Points & Solutions

Pain Point

Our Solution

1 Extremely High Grinding Energy Consumption-Slag is 2-3 times harder to grind than cement clinker. Inefficient systems can consume 50-70 kW·h/t, destroying profitability.

Vertical Roller Mill or Roller Press Pre-Grinding: Our VRM systems achieve 32-38 kW·h/t for 450 m²/kg GGBFS. Roller press + ball mill combination achieves 35-42 kW·h/t. Both are 20-30% lower than conventional ball mill-only circuits.

2 Wet, Sticky Slag Handling & Drying-Granulated blast furnace slag contains 8-15% moisture, clogging feed chutes and reducing grinding efficiency.

Integrated Hot Air Drying & Grinding: Our VRM and roller press systems use kiln waste heat or a hot gas generator to simultaneously dry and grind wet slag in one step, eliminating the need for a separate rotary dryer and reducing total thermal energy cost by 40%.

3 Low Activity Index & Failed Quality Standards-Poor grinding produces slag powder with low 7-day and 28-day activity indices, failing to meet GGBFS grade S95 or S105.

Guaranteed High Reactivity: We guarantee 7-day activity index ≥95% (S105 grade) and 28-day index ≥105% through precise Blaine control (420-500 m²/kg) and optimized particle size distribution. Quality meets GB/T 18046, ASTM C989, and EN 15167 standards.

4 High Wear Cost from Abrasive Slag-Slag's high abrasiveness rapidly wears mill internals, increasing maintenance cost and downtime.

Advanced Wear Protection: VRM grinding rollers and table use high-chromium cast iron or composite ceramic overlays with 8,000-12,000 hour service life. Ball mills use Ni-hard or high-chrome liners. Wear cost per ton is contractually guaranteed.

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Applicable Material

Our slag powder production line is a complete, integrated facility engineered to produce high-quality ground granulated blast furnace slag (GGBFS) and steel slag powder from wet granulated slag. We deliver the entire plant as a single-source EPC project.

System Scope of Supply

Core Process Equipment:
· Wet slag feeding & storage system (hopper, belt feeder, covered storage)
· Hot gas generator or kiln waste heat recovery system (fuel: natural gas, coal gas, or pulverized coal)
· Vertical roller mill (VRM) for slag grinding (preferred for >300,000 TPY) OR roller press + ball mill combination circuit
· High-efficiency dynamic separator (integrated in VRM or standalone for ball mill circuits)
· Product cooling & air-slide conveying system
· Slag powder storage silos (bolted steel or concrete, with homogenization)
· Automatic bulk loading system (for tanker trucks) and/or bag packing system
· Baghouse dust collectors for entire plant (emission <10 mg/Nm³)
· Full PLC/DCS central control system with online Blaine and quality monitoring

Slag Types We Process:
· Granulated blast furnace slag (GBFS) — standard GGBFS production, activity index S75-S105
· Steel slag (BOF/EAF slag) — for cement additive, road base, and carbonation products
· Nickel slag / ferroalloy slag — for construction filler and specialty cement
· Copper slag — abrasive blasting and concrete aggregate
· Lead-zinc slag — for backfill and construction material
· Phosphorus slag — for low-heat cement additive

Product Specifications We Guarantee:

Grade	Blaine (m²/kg)	7d Activity Index	28d Activity Index	Standard
S105	≥500	≥95%	≥105%	GB/T 18046
S95	≥400	≥75%	≥95%	GB/T 18046
S75	≥300	≥55%	≥75%	GB/T 18046
Grade 100	≥500	≥75%	≥100%	ASTM C989
Grade 120	≥550	≥95%	≥115%	ASTM C989

Process

From Wet Slag to High-Performance S95/S105 Powder: How Your Plant Works

Wet Slag Intake & Storage – Granulated blast furnace slag (moisture 8-15%) is delivered by truck and stored in a covered shed. A grab crane or loader feeds it into a feed hopper. The slag's moisture is measured to automatically adjust the hot gas temperature.
Simultaneous Drying & Grinding in VRM – The wet slag is fed into the center of the vertical roller mill's grinding table. Hot gas (from a hot gas generator or kiln waste heat, 200-350°C) is introduced from the bottom, drying the slag as it is ground between the rollers and table. The integrated dynamic separator at the mill top classifies the powder, with on-spec fines exiting and oversize returning for re-grinding.
Product Collection & Cooling – The dried, ground slag powder is collected by a baghouse filter and passed through a product cooler to reduce temperature to <80°C before storage.
Storage & Homogenization – The slag powder is conveyed to large bolted or concrete silos via air slides and bucket elevators. Multi-stream aeration ensures product uniformity in the silo.
Bulk Dispatch – The finished GGBFS is loaded directly into bulk tanker trucks via a bulk loading spout with integrated dust collection. A weighbridge ensures accurate billing. An optional bag packing system is available.

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Technical Specifications

Standard Slag Powder Production Line Configurations (VRM System)

Plant Capacity (TPY)	VRM Model	Installed Power (kW)	Product Blaine (m²/kg)	System Power (kW·h/t, 450 m²/kg)	Site Area (m², approx.)
100,000	GRMS26 / TRMS26	~1,400	400-500	36-42	8,000-12,000
200,000	GRMS33 / TRMS33	~2,500	400-550	34-38	12,000-18,000
300,000	GRMS36 / TRMS36	~3,600	420-550	32-36	18,000-25,000
500,000	GRMS43 / TRMS43	~5,000	420-600	32-35	25,000-35,000
1,000,000	GRMS50 / TRMS50	~9,000	420-600	30-34	40,000+

*VRM is the standard solution for slag grinding. For smaller plants (<100,000 TPY) or dual-purpose (slag + clinker), a roller press + ball mill combination is also available.*

Key Performance Guarantees (Slag Powder S95/S105)

Parameter	Guaranteed Value
Product Blaine specific surface	Target ±20 m²/kg
7-day activity index (S105)	≥95%
28-day activity index (S105)	≥105%
System power consumption (VRM, 450 m²/kg)	≤38 kW·h/t
Wear parts life (roller/table)	≥8,000 hours (high chrome)
Dust emission	<10 mg/Nm³
Plant availability	>85% (annual)

EPC Project Scope Options:
· Full EPC (Turnkey): Complete plant from wet slag receiving to bulk GGBFS dispatch, including civil, steel structure, hot gas system, electrical, automation, and operator training.
· EP (Engineering & Equipment Supply): Design plus supply of all core equipment. Civil works and local erection by others, with our supervision.
· Equipment Supply + Technical Advisory: Core VRM or roller press + ball mill system supply, plus installation supervision and commissioning support.

Tell us your target annual output, slag source and composition, and required product grade (S75/S95/S105). We will prepare a complete slag powder production line proposal with process flow diagram, equipment list, and firm EPC price.

Proven Performance

Proven Performance: Global Slag Powder Plant Projects

Case 1: 300,000 TPY GGBFS Production Line, Southeast Asia
· Scope: Full EPC (Wet slag receiving to bulk loading)
· Configuration: GRMS33 vertical roller mill with hot gas generator (coal gas fuel)
· Product: S95 grade GGBFS, Blaine 450 m²/kg, 7d activity 82%, 28d activity 98%
· Result: System power 35.5 kW·h/t at 450 m²/kg. Commissioned in 13 months. The plant supplies four concrete batching plants with 30% slag cement replacement. ROI achieved in 2.8 years.

Case 2: 500,000 TPY Slag & Steel Slag Dual-Purpose Plant, Middle East
· Scope: Full EPC
· Configuration: Roller press (pre-grinding) + Φ3.2×13m ball mill (finish grinding) + multi-stage separator
· Product: S95 GGBFS and steel slag powder for cement additive
· Result: GGBFS system power 38 kW·h/t (420 m²/kg). Steel slag powder 42 kW·h/t (400 m²/kg). Dual-purpose design saved $2 million investment vs two separate lines.

Case 3: Plant Upgrade: From Ball Mill to VRM, India
· Scope: Replace old 2.4m ball mill circuit with VRM
· Original: 8 TPH at 55 kW·h/t, only 350 m²/kg Blaine
· New: GRMS26 VRM, 15 TPH at 36 kW·h/t, 480 m²/kg Blaine
· Result: Capacity increased 88%, power reduced 35%, product upgraded from S75 to S95 grade. Payback from electricity savings alone: 3 years.

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Quality

EPC Delivery & Slag Powder Quality Assurance

· Single-Source EPC Responsibility: We are the sole engineering, procurement, and construction partner for your slag powder plant. No splitting of responsibility between mill supplier, hot gas system provider, and civil contractor.
· Slag Sample Testing & Pilot Grinding: Before design, we conduct a complete slag analysis (chemical composition, glass content, moisture, grindability) and pilot grinding test. We provide a guaranteed activity index report based on your specific slag source.
· Performance Test & Handover: A 72-hour continuous performance test is conducted to verify output, Blaine fineness, activity index, and specific power consumption. The plant is handed over only after all contractual guarantees are met.
· After-Sales & Wear Parts: 12-month defect liability period. VRM wear parts (rollers, table liner) and other consumables are stocked regionally. Training for operators and lab technicians is included.

FAQ

Slag Powder Production Line

Frequently Asked Questions

1 What is the investment cost of a slag powder production line?

The slag grinding plant cost depends on annual capacity (100,000-1,000,000 TPY), main equipment type (VRM or roller press + ball mill), and EPC scope. A 300,000 TPY VRM-based plant typically requires USD 10-15 million. We provide a detailed quote within 24 hours after receiving your slag specifications.

2 VRM or ball mill: which is better for slag grinding?

For slag grinding >200,000 TPY, a vertical roller mill is the industry standard. It achieves 32-38 kW·h/t for 450 m²/kg, significantly lower than a ball mill (50-60 kW·h/t). For smaller plants or dual-purpose production, a roller press + ball mill combination offers good energy efficiency and flexibility at lower investment.

3 How do you handle the high moisture content of wet slag?

Our VRM and roller press systems integrate a hot gas generator using natural gas, coal gas, or pulverized coal. The hot gas (200-350°C) is introduced directly into the mill, drying the slag as it is ground. This eliminates the need for a separate slag dryer and saves significant investment and thermal energy.

4 What slag powder grades can your plant produce?

We can produce S75, S95, and S105 grade GGBFS per GB/T 18046, and Grade 80/100/120 per ASTM C989. The product Blaine and activity index are precisely controlled by adjusting the mill pressure, classifier speed, and airflow. We guarantee the activity index of your specific slag through pilot testing.

5 How to ensure the activity index of slag powder meets S95 or S105?

The activity index depends on slag quality (glass content, chemical composition), fineness (Blaine), and particle size distribution. Our VRM produces a steeper PSD curve with fewer coarse particles compared to a ball mill, which improves early strength. We pilot-test your slag to determine the exact Blaine target and guarantee the result.

6 Can your plant also process steel slag?

Yes, our dual-purpose lines can process both blast furnace slag and steel slag. Steel slag is harder and contains metallic iron, requiring magnetic separation before grinding and a more robust wear protection system. We configure the plant accordingly based on your slag type.

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Contact Us

Ready to Build Your High-Performance Slag Powder Production Plant?

Send an inquiry. You will receive:

A complete slag powder plant proposal tailored to your slag type, capacity, and target grade (S75/S95/S105).
A process flow sheet, equipment list, and firm EPC price.
A detailed project schedule from design to commissioning.

Your slag source details and business plan are strictly confidential.

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Company Profile

Leading Provider of Mining & Processing Equipment

Kolev Equipment Technology Co., Ltd. is a large-scale private technology enterprise specializing in the research, development, production, and sales of mining and metal ore processing equipment. With over 20 years of experience in ultra-fine grinding, industrial drying, and crushing sand making industries, we provide intelligent solutions and mature supporting products worldwide.

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