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Why do electrolytic aluminum workshops use multi-function overhead cranes? A thorough explanation of the whole process of tapping, anode changing, crust breaking and feeding, and key points for selection

EUROHOIST | 80 years of crane manufacturing experience | Specialists in intelligent industrial lifting solutions

I. The electrolytic aluminum industry is entering a new cycle of "equipment intelligence"

China's electrolytic aluminum industry has already passed the stage of "competing on capacity." As of the end of 2025, China's built electrolytic aluminum capacity is about 44.83 million tons, approaching the policy "ceiling" of 45 million tons, with a capacity utilization rate of over 98%, operating at almost full load; prebaked anode electrolytic cells above 500kA account for more than 45%, and ultra-high-current electrolytic cell technology of 600kA and above has entered the stage of large-scale application.

The capacity ceiling has locked down the expansion path of "quantity," so the industry's competitive focus has naturally shifted to "quality"—specifically, for each workshop, this means equipment reliability, energy consumption levels, and degree of intelligence. The energy-saving and carbon-reduction policies for the electrolytic aluminum industry issued by the National Development and Reform Commission and the Ministry of Industry and Information Technology clearly propose promoting high-efficiency rectifier equipment, intelligent cell control systems, online monitoring equipment, and multi-function intelligent overhead cranes and other advanced equipment; the "Work Plan for Digital Transformation of the Raw Materials Industry (2024-2026)" also requires advancing intelligent logistics scheduling and the application of unmanned overhead cranes.

The policy signal is already very clear: overhead cranes in electrolytic aluminum workshops are being upgraded from "manually operated process auxiliary equipment" to "intelligent process equipment supporting digital factories." For enterprises currently making equipment selections or technical transformation plans, this is exactly the key window period to understand this change and make the right equipment decisions.

II. Why are overhead cranes in electrolytic aluminum workshops not an "ordinary crane"?

If you walk into the upper space of an electrolytic aluminum workshop, you will see rows of overhead cranes traveling above the electrolytic cells. But the overhead cranes here have an essential difference from the traveling cranes in ordinary manufacturing workshops: they directly participate in the electrolytic production process operations and are irreplaceable process equipment on the production line.

The mainstream modern electrolytic aluminum process is the cryolite-alumina molten salt electrolysis method. The temperature inside the electrolytic cell is as high as 940-970°C, and the current intensity reaches 300-600kA or even higher. The electrolysis workshop simultaneously has high temperature, high current, strong magnetic field, high dust, and HF (hydrogen fluoride) corrosive flue gas —five harsh conditions in combination. In this environment, the multifunction overhead crane for aluminum electrolysis must perform seven core process operations:

Based on industry design and operating experience, A multi-function crane typically handles about 30 electrolytic cells' processing operations, operating almost around the clock—this means the crane is not "standby equipment used only occasionally," but core equipment whose "downtime immediately affects the production rhythm." The selection logic for electrolytic aluminum cranes is therefore completely different from that of ordinary cranes: what is compared is not "how much it can lift," but who better understands the electrolysis process, whose tool trolley is more reliable, whose environmental adaptation design is more mature, and who has reserved good interfaces for future intelligent upgrades.

III. EUROHOIST electrolytic aluminum multi-function crane: fourfold capabilities supporting the upgrade of electrolysis workshops

EUROHOIST has 80 years of crane manufacturing experience, has built a 30,000-square-meter production and assembly base in Huzhou, China, and has more than 500 employees worldwide. Our lifting solutions cover light-duty and heavy-load handling, with configurations for the operating conditions, and we have accumulated deep customized delivery experience in more than ten industries, including steel and aluminum, power and energy, aircraft manufacturing, pulp and paper, automobiles, and railway transportation. Global customers include China National Building Material, Sinoma International, Emirates Aluminium, Alstom, GE, and Hyundai.

In response to the special working conditions of electrolytic aluminum workshops, we inject the following fourfold capabilities into the design and delivery of electrolytic aluminum cranes:

Capability 1: Design for harsh environments — from "adapting to the environment" to "active protection"

The HF flue gas, strong magnetic fields, and dust in electrolytic aluminum workshops are the root cause of many general-purpose cranes being "unable to adapt." EUROHOIST's long-term experience in harsh-environment fields such as waste-to-energy power generation and the steel and aluminum industries gives us systematic solutions for the combined working conditions of "high temperature + dust + corrosive media":

• Corrosion-resistant material selection and coating: For HF flue gas environments, corrosion-resistant materials are selected, with a multi-layer protection system of Sa2.5 blasting + epoxy zinc-rich primer + polyurethane topcoat, and local reinforcement at key parts;

• Fully sealed structural design: The drive devices, electrical control system, and tool trolley actuators adopt dustproof sealing design to prevent dust intrusion from causing wear and electrical faults;

• Electrical design for strong magnetic field environments: Anti-electromagnetic interference design for electrical systems such as inverters and PLCs, improved insulation levels, and optimized heat dissipation ducts ensure stable equipment operation in strong magnetic field environments;

• High-temperature environment protection: Heat dissipation design and high-temperature-resistant seals for motors, reducers, and hydraulic systems ensure reliability for long-term continuous operation.

Capability 2: Special customization capability — covering the full range of scenarios from routine operations to heavy maintenance

The lifting needs in electrolytic aluminum workshops vary widely—daily anode changing and tapping are frequent operations at the tens-of-tons level, while anode busbar lifting frames and cell shell lifting during major overhauls are heavy-duty operations. EUROHOIST's "special cranes" support advanced configurations such as multiple support points, multiple spans, slewing, suspension, heavy duty, and visual recognition, Special lifting capacity up to 250 tons SWL, working class M8 (CMAA Class F), and can provide tailor-made solutions for the heavy lifting needs of electrolytic aluminum workshops.

At the same time, the tool trolley (crust breaker, feeding mechanism, anode clamp, slag removal mechanism, tapping system), as the process core of the electrolytic aluminum crane, is specially designed and selected according to the operating frequency and load characteristics of the electrolysis process, with "reliability of process equipment" as the highest priority.

Capability 3: European-style lightweight design — reducing civil construction and operating costs

The load-bearing capacity of the workshop roof trusses and rails is a hard constraint in the selection of electrolytic aluminum cranes. EUROHOIST adopts Q355-B high-strength steel structure and a compact transmission layout to achieve lightweight design while meeting the rated load—the reduction in the overall machine's own weight directly brings three benefits: reduced civil construction investment for the workshop roof trusses and rail foundations, lower energy consumption of the travel mechanism, and reduced wear of the crane wheels and rails. For existing plant renovation projects, lightweight design often means "larger-tonnage equipment can be installed without reinforcing the roof trusses."

Capability 4: Fully automatic intelligent control — paving the way for unmanned electrolysis workshops

The impact of the high-temperature, strong-magnetic-field environment in electrolytic aluminum workshops on the human body is a long-standing concern in the industry. The EUROHOIST fully automatic crane platform supports PLC fully automatic control, adopts mainstream industrial protocols such as Profinet/EtherNet/IP/Modbus TCP, and integrates functions including anti-sway control, precise positioning, and automatic path planning:

• Remote operation of tapping operations: remote operation and data upload of the tapping carriage, vacuum system, and metering system keep operators away from the high-temperature area of the electrolytic cells;

• Semi-automated anode changing operations: path presetting + precise positioning assistance reduce operational difficulty and the risk of human error;

• Reserved intelligent interfaces: from the selection and design stage, data and communication interfaces are reserved for future connection to intelligent cell control systems, MES systems, and unmanned scheduling systems, avoiding "equipment bought today that cannot be modified tomorrow".

IV. Five-Step Self-Check List for Electrolytic Aluminum Crane Selection

Before contacting suppliers, it is recommended to first clarify the requirements according to the following five dimensions:

Fill out this checklist clearly before conducting technical exchanges with suppliers, and the efficiency of solution comparison will be much higher.

V. Frequently Asked Questions (FAQ)

Q1: How many people are needed to operate an electrolytic aluminum multi-function crane?

Usually, either a control cabin or a remote control can be used, and they can work together or be controlled independently. One crane is equipped with 1 operator. With the advancement of remote and semi-automatic upgrades, operators can move from the control cabin above the electrolytic cells to a central control location at the edge of the workshop, reducing work intensity in high-temperature, strong-magnetic-field environments.

Q2: Is the tapping metering system of an electrolytic aluminum crane accurate?

The tapping metering system (vacuum tapping + weighing metering) supports single-batch and cumulative metering, display, and printing. Metering accuracy depends on the selection of weighing sensors and regular calibration and maintenance. We recommend incorporating calibration of the metering system into the routine maintenance plan, and it can be connected to the plant's production statistics system to enable automatic data upload.

Q3: Can existing electrolytic aluminum cranes be upgraded?

On the premise that the main structure is in good condition and the load-bearing capacity of the rails and plant meets requirements, existing cranes can be upgraded systematically—adding intelligent control systems, precise positioning, and anti-sway modules to achieve remote operation and semi-automatic operations; upgrading the electrical system to ensure stable operation in strong magnetic field environments. The specific upgrade plan needs to be determined after on-site assessment of the existing equipment.

Q4: What is the spare parts supply cycle for electrolytic aluminum cranes?

EUROHOIST has a 30,000-square-meter production and assembly base and spare parts warehouse in Huzhou, Zhejiang. Key drive components use internationally common brands (such as SEW geared motors, Siemens electrical components, etc.), and most spare parts can be dispatched quickly. For tool carriage wear parts (crust breaker hammers, clamps, discharge valves, etc.), we support establishing a spare parts reserve plan according to the typical consumption cycle of electrolytic aluminum workshops.

Q5: How long does the installation and commissioning cycle for an electrolytic aluminum crane generally take?

The electrolytic aluminum multi-function crane is large special equipment. From contract signing to production, it usually takes 5-8 months: detailed design and material procurement 1-2 months, manufacturing of structural parts and tool carriage 3-4 months, on-site installation and complete machine commissioning 1-2 months. If joint debugging of the tapping metering system and intelligent system is involved, the cycle will be extended accordingly. It is recommended to start inspection of rail and plant conditions simultaneously in the early stage of project planning to compress the overall schedule.

Q6: Why is it said that electrolytic aluminum cranes should "reserve interfaces for future intelligence"?

Industry policies are clearly promoting the application of "multi-function intelligent cranes" and unmanned cranes, and the unmanned process in electrolytic aluminum workshops will gradually move from "pilot" to "standard". If the crane control system purchased today has a closed architecture and does not use open protocols, future upgrades can only be done by starting over; if an open industrial protocol architecture is adopted from the design source and sensor and communication interfaces are reserved, future intelligent upgrades will only require software-level development and joint debugging, and both cost and time will be much lower. This is a point we repeatedly emphasize at the selection stage—Equipment decisions must have a time dimension.

EUROHOIST

80 years of crane manufacturing experience | Specialists in intelligent industrial lifting solutions

China production and assembly base: Huzhou High-tech Zone, Zhejiang | Factory area: 30,000 square meters

Product range: Light-duty and heavy-load handling, configured for the application | Fully automatic cranes | Special custom cranes (250T / M8 class) | Overhead/gantry cranes | Refuse grab cranes | Various electric hoists and lifting mechanisms

Service sectors: Iron and steel aluminum industry | Electrolytic aluminum and non-ferrous metallurgy | Power and energy | Waste incineration power generation | Aircraft manufacturing | Pulp and paper | Automobile manufacturing | Railway transportation | Machinery manufacturing | Food industry

Global partners: China National Building Material | Sinoma International | GE | Alstom | Hyundai (Korea) | Emirates Global Aluminium

Official website: www.EUROHOIST.com.cn