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Technical Process and Functional Principle
The fifty tons per hour iron ore rotary drying line operates as a fully enclosed, continuous industrial system running under automated micro-negative pressure to ensure maximum thermal containment and zero dust leakage.
The process begins in the wet material handling and feeding section. Wet iron ore concentrate or beneficiated filter cake with an initial moisture content of approximately twelve percent is loaded into a heavy-duty storage hopper. This hopper is lined with ultra-high-molecular-weight polyethylene sheets to prevent the sticky iron ore fines from bridging or hanging up. A high-frequency electromagnetic vibrating feeder positioned beneath the hopper delivers a continuous, metered flow of ore onto a heavy-load, wide belt conveyor. This conveyor is driven by a high-torque gearbox and features a heavy vulcanized rubber scraper assembly on the return side to thoroughly clean any sticky iron ore residue off the belt surface.
The ore moves from the conveyor into an oversized feed chute positioned at a steep sixty-five-degree incline to ensure the sticky mineral mass slides smoothly into the drying drum. The interior of this inlet chute is reinforced with twenty-millimeter replaceable plates cast from high-manganese steel to withstand continuous abrasive impact. The massive rotary drum is installed at a continuous slope of two to four degrees relative to the horizontal axis. It is driven by a fifty-five-kilowatt variable-frequency motor that rotates the cylinder slowly at an adjustable speed between one point five and five point five revolutions per minute. The joint forces of gravity and mechanical rotation continuously advance the dense ore from the elevated feed end toward the lower discharge end.
As the ore enters the front section of the drum, high-pitch spiral shedding flights quickly push the wet mass away from the high-temperature inlet zone to prevent flash-caking. Moving into the central drying zone, the ore is repeatedly intercepted by alternating L-shaped and comb-tooth lifting flights cast from specialized wear-resistant alloy steel. These flights lift the heavy iron ore grains and cascade them uniformly across the entire cross-section of the drum, creating a dense, continuous material curtain. Simultaneously, high-velocity hot air ranging from three hundred to six hundred degrees Celsius generated by the combustion furnace passes directly through this material curtain. This counter-current or co-current thermal aerodynamic flow causes rapid heat and mass exchange, flash-evaporating surface and capillary moisture in a single pass.
The moisture-laden, spent exhaust gas is continuously drawn out of the rear housing by a seventy-five-kilowatt induced draft fan. The dust-heavy gas stream first enters a high-throughput multi-cyclone separator that leverages centrifugal force to intercept up to ninety-eight percent of coarse airborne ore particles. The remaining airflow passes through an oversized pulse-jet baghouse collector fitted with high-temperature, anti-static Nomex filter bags for secondary fine filtration. This dual-stage filtration system compresses final particulate emissions to less than twenty milligrams per cubic meter, satisfying strict global environmental air safety guidelines. All captured fine dust is continuously reclaimed via an enclosed screw conveyor loop and recombined directly into the main finished product stream, boosting the comprehensive material recovery rate past ninety-nine percent. The thoroughly dried iron ore, with its moisture content reduced to below one point five percent, passes through a sealed star air-lock discharge valve onto a heat-resistant rubber belt conveyor that transports it directly to your pelletizing plant or product stockpiles.
Core System Features and Engineering Characteristics
The primary engineering hurdle of processing iron ore is its massive bulk density, which typically exceeds two point five tons per cubic meter, combined with severe abrasive scouring. To combat this, the main drum shell is rolled from twenty-two to twenty-eight-millimeter thick premium alloy boiler plate steel, offering rigid structural support far superior to standard industrial dryers. The internal lifters and wear zones are cast from a proprietary chromium-manganese alloy, pushing their operational wear life past twelve thousand hours. Additionally, the twin riding rings and supporting trunnion rollers are forged from solid steel alloy, undergoing extensive through-hardening and non-destructive ultrasonic flaw detection to eliminate any risk of internal structural cracking under continuous heavy weight loads.
To solve the industry-wide issue of sticky iron ore fines adhering to the internal drum walls, which forms a thick crust that ruins heat transfer rates, the interior layout incorporates an automated self-cleaning heavy chain scraper system. Multiple loops of heat-resistant heavy alloy chains are suspended inside the drum sections. As the cylinder rotates, these chains continuously sweep and strike the inner walls, clearing off any sticky mineral buildup before it can bake into a crust. This mechanism ensures that the heat exchange surfaces stay completely clean, maintaining peak thermal performance day after day.
The entire plant achieves a high comprehensive thermal efficiency rating of seventy-two to seventy-eight percent by integrating a fully insulated drum exterior with an airtight mechanical soft-seal layout. This design traps heat and lowers fuel usage per ton of evaporated water. The combustion assembly offers universal fuel adaptability, letting you choose between multi-stage natural gas or liquefied petroleum gas burners, heavy oil or diesel fuel trains, automated coal-grinding pulverized coal chambers, or direct waste heat ducting from your existing smelting or sinter furnaces.
The automation layout relies on a centralized Siemens master programmable logic controller connected to a twelve-inch color touchscreen human-machine interface. This control module supports immediate multi-language switching for seamless global operations. Multi-point thermal sensors positioned at the hot air inlet, main internal zones, and exhaust stack feed real-time temperature data back to the processor. The controller automatically tunes the fuel injection rate and adjusts the raw material feeding conveyor speed to match changing moisture levels. This advanced process automation stabilizes the final product moisture within a tight margin of plus or minus zero point three percent while lowering overall plant utility bills by fifteen percent.
Factory-Direct Sourcing and Engineering Support
By working directly with our authentic manufacturing factory in China, you completely eliminate the twenty to thirty-five percent markups typically added by trading companies and commercial agents. Every dollar of your procurement capital goes directly into heavy-duty metallurgy, high-end electronics, and robust wear-resistant alloys. We customize every single aspect of the line to match your specific iron ore mineralogy, whether you process magnetite, hematite, or highly sticky limonite, while aligning with your local plant footprint and three-phase industrial voltage frequencies. Before shipping, the entire fifty tons per hour plant completes a mandatory seventy-two-hour continuous full-load dry mechanical run on our factory floors to guarantee absolute operational readiness.
Please share your exact ore type, initial moisture levels, preferred local fuel type, and site voltage standards. Our engineering team will deliver a complete technical proposal and a factory-direct commercial quotation within twenty-four hours.
Technical Specifications
| Product Specs (m) | Capacity (T/H) | Main Motor Power (kW) | Main Motor Model | Main Gearbox Model | Ratio |
| φ1.2×10m | 2.5 | 7.5 | Y160M-R3 | ZL50-16-1 | - |
| φ1.5×12m | 3.3 - 4.9 | 10 | Y160L-6B3 | JZQ500-III-2F | - |
| φ1.5×15m | 4 - 6 | 18.5 | Y200L-6 | JZQ500-III-2F | - |
| φ1.8×12m | 4 - 6 | 11 | Y200L-6 | ZQ50-16II-2 | 16.46 |
| φ2.2×12m | 7 - 12 | 18.5 | Y160L-6 | JZQ650-III | 31.5 |
| φ2.2×14m | 7 - 12 | 18.5 | Y160L-6 | JZQ750-III | 31.5 |
| φ2.2×16m | 12 | 30 | Y225M-6 | JZQ750-III | 31.5 |
| φ2.4×14m | 12 | 30 | Y250M-6 | JZQ750-III | 31.5 |
| φ2.4×18m | 10 - 13 | 37 | Y250M-6 | ZL85-13-1 | 27.16 |
| φ2.4×20m | 10 - 14 | 37 | Y250M-6 | ZL85-13-1 | 27.16 |
| φ3×20m | 25 | 55 | Y250M-4 | ZL100-16-1 | 41.52 |
| φ3×25m | 32 - 36 | 75 | YR280M-4 | ZL100-16-1 | 41.52 |
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