1.1 Working Conditions of Pellet and Sintering Production
Modern iron ore sintering and oxide pellet production lines belong to 24/7 continuous industrial production systems. The raw material composition is complex with high abrasion, fluctuating batching parameters and strict continuous operation requirements. Typical production materials include iron ore concentrate, fine iron powder, return ore, dedusting ash, OG sludge, steel slag powder, bentonite binder, quicklime, limestone and pulverized coal.
The pellet and sintering process requires uniform micro-distribution of moisture, binders and fluxes to stabilize material air permeability, ensure stable balling and roasting quality, and reduce product defects and energy consumption.
1.2 Deficiencies of Traditional Mixing Equipment
Most traditional sintering and pellet plants adopt rotary drum mixers and batch intensive mixers, which cannot adapt to the current production demand of high-proportion superfine iron concentrate. The main drawbacks are as follows:
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Poor mixing uniformity: Relying on material rolling and falling without high-strength shear, resulting in fine powder agglomeration, uneven moisture segregation and layered materials.
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Unstable production continuity: Batch mixing causes inconsistent material retention time, fluctuating green pellet strength and high return material rate.
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High operation and maintenance costs: Large floor space, serious liner wear, low granulation efficiency and high consumption of bentonite and solid fuel.
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Low resource utilization rate: Unable to fully mix and recycle metallurgical solid waste such as dedusting ash and steel slag powder, resulting in waste of resources.
Conclusion: The AKW continuous intensive mixer is the optimal equipment for large-scale pellet and sintering production lines, perfectly matching the non-stop continuous feeding, mixing and discharging working conditions of modern metallurgical plants.
2. Working Principle of AKW Continuous Intensive Mixer
The AKW continuous intensive mixer adopts counter-current 3D shear mixing technology derived from mature European core mixing principles. The inclined cylinder runs at low speed, while the eccentric high-speed rotor blades rotate in reverse direction at high speed. Materials continuously undergo throwing, high-strength shearing, convection stirring and kneading dispersion inside the mixing chamber to achieve full dead-angle-free mixing.
The special baffle design eliminates mixing dead corners and realizes uniform micro-dispersion of powder, water and liquid additives. Materials complete homogenization, humidification and pre-granulation in one continuous process, and are discharged by cylinder gravity without batch interval, realizing 24-hour uninterrupted online operation.
3. AKW Customized Hardware Configuration for Pellet & Sintering Working Conditions
3.1 Wear-Resistant Chamber Structure
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Removable high-chromium alloy wear-resistant liners, effectively resisting strong abrasion of iron fine powder and steel slag powder
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Thickened alloy mixing blades with independent replacement design, reducing overall maintenance cost
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External drive and deceleration structure, isolated from dust and material area, improving equipment stability
3.2 Intelligent Humidification & Additive Spraying System
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Multi-channel independent atomizing nozzles for precise moisture control of sintering and pellet raw materials
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High-pressure spraying components for bentonite and lime milk, realizing micron-level uniform dispersion of liquid binders
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Online temperature and humidity real-time monitoring sensors to feedback and adjust mixing parameters dynamically
3.3 Full-Automatic Variable Frequency Control System
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Independent frequency conversion adjustment of rotor and cylinder speed, flexible control of shear strength and material retention time
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Docking with upstream batching scale and downstream disc balling machine to realize linkage control of the whole production line
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Built-in fault early warning, wear monitoring and operation data storage module, adapting to intelligent metallurgical workshops
3.4 Special Structure for Metallurgical Solid Waste Recycling
AKW strengthens the shearing and kneading structure exclusively for difficult-to-treat materials such as iron-containing dust sludge, blast furnace sludge and steel slag fine powder, realizing continuous mixing and granulation of metallurgical solid waste and efficient resource recycling for sinter and pellet production lines.
4. AKW Professional Application Solutions for Sintering & Pellet Production
4.1 Sintering Raw Material Pre-Treatment Solution
Iron ore powder, quicklime, fuel and return ore are continuously fed into the AKW intensive mixer. The equipment breaks up fine powder agglomerates through high-strength shear, evenly distributes flux and fuel, and completes quantitative humidification and primary granulation. The homogenized mixed materials are directly transported to the sintering machine for cloth production.
Production Benefits: Stabilize sintering speed, improve sinter tumbler strength, reduce solid fuel consumption and cut down sinter return ore rate.
4.2 Oxide Pellet Raw Material Preparation Solution
Iron ore concentrate and bentonite additives are mixed continuously and stably by the AKW continuous intensive mixer. The high-speed shear fully disperses bentonite to make it evenly wrap iron ore particles, realizing uniform humidification and pre-treatment of pellet raw materials. The finished homogeneous materials are sent to the disc balling machine to produce high-quality green pellets.
Production Benefits: Uniform green pellet compressive strength, reduced pellet bursting rate, stable finished pellet reducibility, and 10%-18% bentonite consumption saving.
4.3 Metallurgical Solid Waste Recycling Solution
Industrial waste such as dedusting ash, steel slag powder and metallurgical sludge is mixed and granulated continuously with binders through the AKW continuous intensive mixer, and returned to the sintering batching system for reuse. It solves the problem of solid waste accumulation and realizes green and circular production of iron and steel plants.
5. AKW Equipment Performance Comparison
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Performance Parameter
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Traditional Drum Mixer
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Batch Intensive Mixer
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AKW Continuous Intensive Mixer
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Working Mode
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Rolling mixing, discontinuous stability
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Batch start-stop, interval discharging
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24/7 continuous feeding & discharging
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Fine Powder Mixing Effect
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Poor, easy agglomeration
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Good, with batch deviation
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Excellent, no dead angle, stable consistency
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Floor Space
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Large occupation
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Medium, with cache bin
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Compact structure, small footprint
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Operation & Maintenance Cost
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High overall replacement cost
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High start-stop loss
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Modular replacement, low maintenance cost
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Energy & Binder Consumption
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High consumption
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Unstable consumption
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Low and controllable consumption
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6. AKW Equipment Selection Guide
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Small Pellet Plants (≤150t/d output): AKW 30-80t/h continuous intensive mixer
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Medium Sintering & Pellet Combined Production Line: AKW 100-300t/h model
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Large Iron & Steel Base Sintering Workshop: AKW 400-600t/h high-capacity model
AKW Standard Matching Configuration: Wear-resistant liner, multi-channel atomizing water supply system, variable frequency control system, online material monitoring module, dust removal interface, hydraulic maintenance door.
7. AKW Operation & Maintenance Solution for Harsh Metallurgical Conditions
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Daily Inspection: Regularly check blade wear, nozzle blockage and uniform feeding status
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Modular Maintenance: Wear parts can be disassembled and replaced independently without overall machine shutdown
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Parameter Calibration: Regularly calibrate water flow and rotor speed, adjust shear strength according to ore material characteristics
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Remote Monitoring: Support central control system connection, real-time viewing of all equipment operating data
8 Conclusion
Traditional drum mixers and batch mixing equipment can no longer meet the high-efficiency and energy-saving production requirements of modern pellet and sintering industries with superfine iron concentrate as the main raw material. The AKW continuous intensive mixer realizes integrated continuous operation of feeding, high-strength mixing, humidification pre-granulation and discharging.
As a professional metallurgical mixing equipment manufacturer with European mature technology accumulation, AKW equipment stably improves the uniformity of sintering and pellet raw materials, optimizes production quality, reduces binder and fuel consumption, and efficiently realizes metallurgical solid waste recycling. It is the core preferred mixing equipment for upgrading and renovating global iron ore sintering and pellet production lines.
