Analysis of Clogging Issues in the Fine Ore Silo and Implementation Plan for Technical Retrofitting

Analysis of Clogging Issues in the Fine Ore Silo and Implementation Plan for Technical Retrofitting

I. Analysis of the Current Situation, Problems, and Their Causes

At the current stage, the fine‑ore silos frequently experience blockages during operation—such as wall adhesion and crust formation, material arching, channeling through “rat holes,” and material interruptions leading to shutdowns—severely compromising the continuous, stable operation of the production line. Based on an analysis of site conditions, these blockages result from the combined effects of material characteristics, silo geometry, environmental factors, and operational practices. From a material standpoint, the incoming fine ore exhibits elevated moisture content, a high proportion of fines and clay, strong particle cohesion, and poor flowability; moreover, prolonged static storage promotes compaction and hardening. Structurally, insufficient cone‑angle at the hopper, undersized discharge openings, rough wear on the silo lining, and structural dead zones all predispose the system to material buildup and arching. Environmentally, diurnal temperature swings cause condensation on the silo walls, while winter low temperatures can lead to freezing; damp, rainy weather further exacerbates moisture absorption and material adhesion. Operationally, long‑term intermittent discharging at low rates, inadequate dust removal and pressure relief within the silo, malfunctioning fluidization and clearing equipment, and untimely manual cleaning of adhering material—all compounded by unauthorized manual attempts to clear blockages—worsen the problem and pose significant safety risks.

II. Comprehensive Rectification and Governance Measures

In response to the aforementioned risk of blockages in the fine‑ore bins, systematic corrective measures have been developed in alignment with on‑site production conditions. In terms of raw‑material management, the screening, stacking, and conveying processes have been optimized; enclosed rain‑proof facilities have been installed; the moisture content of fine ore entering the bins is strictly controlled at ≤4%; dry and wet materials are stored separately; and the first‑in, first‑out principle is followed to minimize the residence time of materials in the bins, ensuring rapid material turnover. Regarding bin modifications, the cone angle of the hopper has been optimized to 65°–75°, the corners of the discharge opening have been replaced with rounded transitions to eliminate structural dead zones, and protruding weld seams on the bin walls have been ground down. Wear‑resistant, anti‑slip lining plates have also been added to reduce the friction coefficient of the bin walls, thereby improving material flow under gravity at the structural level. For equipment operation and maintenance, existing equipment has been inspected and overhauled; obsolete or poorly performing units have been decommissioned, and the installation locations of clearing devices have been optimized. In production management, unloading procedures have been standardized to prevent prolonged shallow material levels and intermittent low‑flow discharges, ensuring continuous, balanced material flow. A bin‑inspection logbook has been established, with regular cleaning of adhering material from the bin walls; unauthorized manual excavation to clear blockages is strictly prohibited, thus mitigating equipment failures and safety risks.

III. Special Technical Renovation Plan for the Dual-Position Vibration-Based Unloading and Dredging Machine

To thoroughly address the persistent issues of frequent blockages in the fine‑ore bin, poor performance of conventional flow‑assisting equipment, and the high risks associated with manual unclogging, this technical upgrade introduces new features. Dual-position vibratory unloading and clearing machine As a core unblocking device, this equipment features a symmetrical dual‑machine configuration and is installed in the critical arching‑and‑clogging zone beneath the hopper cone and above the discharge outlet. By generating high‑frequency, low‑amplitude, directional vibrations, it continuously disrupts the interlocking structure of powder particles, effectively eliminating bridging, wall adhesion and crust formation, as well as channeling and flow deviation. The vibration is transmitted only to the flowing material in the discharge section of the hopper, without compacting the upper layers, thereby addressing inherent design shortcomings of the hopper. It is well suited to harsh operating conditions involving moist, ultrafine, and easily agglomerating powdered ores.

The equipment control system features a dual-mode operation—local manual and remote automatic—and can be interlocked with upstream conveying and feeding equipment. It automatically starts, stops, and adjusts the vibration frequency based on the discharge status, enabling fully automated, unmanned clearing and unloading. This equipment replaces the inefficient clearing methods of traditional air cannons and conventional vibrators, completely eliminating high‑risk manual blockage‑removal operations. It ensures continuous, uniform material discharge from the hopper, stabilizes downstream production conditions, and significantly reduces equipment maintenance and operating costs, labor expenses, and potential safety hazards.

IV. Implementation Outcomes and Benefits of Technological Upgrading

Upon completion of this comprehensive remediation and the targeted equipment upgrades, the issues of arching, wall adhesion, material blockages, and compaction in the fine‑ore bins will be completely resolved, enabling seamless operation under a wide range of challenging conditions—including high humidity, low temperatures, and a high proportion of fine particles. This will significantly enhance the stability of material discharge from the fine‑ore bins and ensure continuous production, reducing the frequency of line shutdowns and boosting overall operational efficiency. At the same time, it will cut down on consumable wear and tear associated with conventional unclogging equipment and the labor required for manual clearing, thereby lowering production and maintenance costs and eliminating the safety risks posed by manual unclogging. Ultimately, this ensures safe, stable, and energy‑efficient equipment operation, providing reliable support for the line’s sustained, uninterrupted production.