400QJH210-300-300KW High-Voltage Pump for Bauxite Mine Dewatering

Project Background

A large bauxite mining operation needed to manage groundwater infiltration and seasonal rainwater accumulating in its working area. Rising water levels in the mine sump could interfere with excavation, equipment movement, haul-road access and the production schedule.

The existing drainage arrangement had to lift water from a deep collection point to a surface treatment area. Because of the substantial elevation difference and the length of the discharge pipeline, a conventional low-head pump could not reliably cover the required duty.

After reviewing the required capacity, total dynamic head, well dimensions, mine-water conditions and available electrical supply, the 400QJH210-300-300KW high-voltage deep-well submersible pump was selected for the project.

Project Challenges

The main challenges included:

• A long vertical lifting distance
• A relatively high mine-water discharge requirement
• A three-phase 3000V, 50Hz site power supply
• Mine water containing possible mineral matter and limited sediment
• Restricted installation space inside the drainage well
• Continuous operation under changing water levels

Selecting the pump by elevation alone would not have been sufficient. Pipeline friction, fittings, outlet pressure and dynamic water-level changes also had to be included in the total head calculation.

Selected Pump

The project used the following configuration:

• Model: 400QJH210-300-300KW
• Pump type: Multistage high-voltage deep-well submersible pump
• Reference capacity: 210m³/h
• Reference head: 300m
• Motor power: 300kW
• Voltage: Three-phase 3000V
• Frequency: 50Hz
• Pump body: Cast steel
• Impellers: Stainless steel
• Motor construction: Semi-stainless-steel configuration
• Installation: Vertical submerged installation
• Pumped liquid: Mine water within the confirmed operating limits

Note: The stated capacity and head follow the common model designation. Final performance must be verified in the approved technical datasheet and factory test documentation.

Pumping Solution

A multistage submersible pump was installed directly in the mine collection well. During operation, the successive impeller stages increase the water pressure before the water enters the vertical discharge pipeline and is lifted to the surface.

The cast-steel pump body provides the structural strength required for the installation. Stainless-steel impellers improve the adaptability of critical hydraulic components to the mine-water environment. The semi-stainless motor configuration balances submerged-service requirements, mechanical strength and project cost.

The supporting system was configured with high-voltage controls, motor protection, water-level monitoring and a non-return valve. Automatic level control manages pump operation as the sump water level changes and helps prevent operation below the permitted water level.

The system included:

1. One 400QJH210-300-300KW deep-well submersible pump;
2. High-voltage starting and control equipment for the 3000V supply;
3. A high-voltage submersible power cable;
4. Vertical discharge pipes and connection components;
5. A check valve, isolation valve and pressure-monitoring device;
6. Water-level monitoring and motor-protection functions;
7. Provision for standby drainage capacity where required.

Why This Pump Was Selected

High-Head Performance

The multistage hydraulic structure is suitable for deep lifting applications and systems with considerable pipeline resistance.

Compatibility With the Site Power Supply

The 300kW, three-phase 3000V motor configuration matched the high-voltage electrical system available at the mine.

Stainless-Steel Impellers

Stainless-steel impellers provide improved corrosion resistance for important hydraulic components. The exact material grade should be confirmed against the pH, chloride content and abrasive properties of the water.

Space-Saving Submersible Installation

The integrated pump and motor can be installed directly inside the well, eliminating a conventional suction pipeline and reducing the amount of surface equipment required.

Automatic Water-Level Control

Level sensors and the high-voltage control cabinet allow the system to manage pump starting and stopping according to the water level while monitoring essential motor-protection conditions.

Installation and Commissioning

Before shipment, the assembled pump was checked for manufacturing quality, electrical integrity and relevant operating parameters. At the mine, the installation team completed the cable connection, riser-pipe assembly, pump lowering and control-system commissioning.

Key installation checks included:

• Well diameter and available lowering clearance
• Cable size, joint sealing and cable support
• Pressure rating and security of the discharge connections
• Pump submergence and motor-cooling conditions
• Correct installation direction of the check valve
• Coordination between motor data and control settings
• Operation of the water-level controls and alarms

The system was then commissioned under controlled conditions. Operating arrangements were confirmed against the actual water level and discharge pressure.

Project Outcome

Following commissioning, the mine had a drainage path matched to its well depth, pipeline arrangement and electrical supply. The pump could transfer accumulated water from the collection well to the surface treatment area.

The solution helped the project:

• Address its high-head mine dewatering requirement
• Improve water-removal capacity
• Reduce disruption caused by accumulated mine water
• Manage pump operation through water-level control
• Protect the motor against selected abnormal electrical conditions
• Retain the option of adding standby pumping and remote monitoring

Actual capacity, energy consumption, operating hours and drawdown figures should only be published after they have been verified against the real project records.

Conclusion

This project demonstrates how the 400QJH210-300-300KW high-voltage deep-well submersible pump can be applied to bauxite mines and other high-head mine drainage systems.

A mine dewatering pump should not be selected by motor power or static elevation alone. Dynamic water level, pipeline losses, water chemistry, sand content, operating schedule and the available electrical system must all be evaluated.

For a project-specific selection, provide the required flow rate, total dynamic head, well depth, well diameter, dynamic water level, pipeline data, water analysis and power-supply details. A technical pump selection, datasheet, installation recommendation and auxiliary-equipment proposal can then be prepared.