NT Series Peripheral Rack Drive Thickener

Product Overview of NT Peripheral Rack Drive Thickener

NT type peripheral rack and pinion drive thickener is a high-efficiency gravity concentration equipment designed for large capacity and low concentration working condition. It adopts the innovative peripheral rack-and-gear transmission system, replacing the traditional center drive or peripheral roller drive, featuring high output torque, stable and reliable operation, low energy consumption and strong adaptability. The diameter of the equipment covers from 15 meters to 53 meters, and it is widely used in solid-liquid separation and dewatering operations in coal, metal mines, non-metal mines, chemical industry and environmental protection industry.

Core Advantages

1. Efficient and powerful transmission system

   • Double rack and pinion drive design: symmetrical drive on both sides, transmission efficiency increased by about 25% compared with the traditional peripheral transmission structure, smooth operation, no crawling phenomenon.

   • Super torque output: the sturdy rack and pinion mechanism can efficiently convert the power into the rotating torque of the harrow frame, and under the same motor power, the processing capacity and anti-pressure harrowing capacity can be increased by more than 30%.

   • Perfect overload protection: Equipped with automatic overload alarm and lifting system, it can automatically stop and lift the harrow frame in case of overload, effectively avoiding equipment damage.

2. Sturdy and durable structure design

   • Central pillar: adopts reinforced concrete structure or large-scale steel structure, with strong bearing capacity, good stability and extremely long service life.

   • Truss system: Adopting high-strength steel structure design with sufficient rigidity and excellent resistance to bending and torsion deformation, ensuring smooth operation under huge torque.

   • Feeding system: Equipped with multi-stage diversion tank or energy dissipation barrel, the slurry enters the settling area evenly and smoothly, avoiding disturbing flow and ensuring the best settling effect.

3. Intelligent control system

   • Frequency conversion speed control: according to the material concentration and load, stepless adjustment of rake frame speed to realize the optimal running condition.

   • Remote monitoring: provide remote control interface, which can be integrated into DCS or PLC central control system to realize unattended operation.

   • Failure self-diagnosis: with automatic diagnosis function, real-time monitoring of motor current, harrow frame torque and other key parameters, failure warning, convenient maintenance.

NT type peripheral rack and pinion drive thickener technical parameters table

Note: The processing capacity varies greatly due to the nature of materials (particle size, specific gravity, concentration) and process requirements, the above is a reference range.

Working Principle

1. Feeding: The slurry is sent to the feeding cylinder in the center of the pool or the diversion tank on the truss through the feeding pipe, so that it can be preliminarily deenergized and evenly dispersed.

2. Sedimentation: solid particles settle freely under the effect of gravity, gradually forming a compression zone at the bottom of the pool.

3. Concentration: The rake blades on the slowly rotating rake frame gently push the concentrated solid material (underflow) to the central discharge at the bottom of the tank.

4. Separation: The clarified water (or process water) overflows from the continuous overflow weir around the pool body, realizing solid-liquid separation.

Main application areas

• Coal industry: coal slurry water concentration and recycling, closed circuit recycling of coal washing wastewater, treatment capacity can be increased by 40%.

• Mineral processing industry:

  • Tailings concentration: efficient concentration of tailings, realizing high concentration discharge (bottom stream concentration ≥65% ), saving transportation energy and water resources.

  • Concentrate dewatering: as pretreatment equipment before filtration or drying.

• Environmental protection engineering:

  • Industrial wastewater treatment: such as the water treatment system of steel mills and power plants.

  • Municipal sludge thickening: improve the solid rate of sludge and reduce the load of subsequent treatment.

Selection Guide

• Selection according to the treatment capacity:

  • Daily treatment capacity ≤500t: NT-15 is recommended.

  • Daily treatment capacity 500-1500t: NT-18～NT-24 is recommended.

  • Daily treatment capacity ≥1500t: NT-30 and above are recommended.

• Key selection factors:

  • Material characteristics: including specific gravity of solids, particle size distribution, feed concentration, etc.

  • Process requirements: target bottom stream concentration and overflow water clarity.

  • Site conditions: the diameter of the site available for installation and geological conditions.

Installation and Maintenance Points

• Installation core accuracy requirements:

  • Track installation leveling error needs to be ≤2mm/m.

  • The meshing gap between rack and gear needs to be adjusted within 3-5mm.

  • The verticality error of the center column needs to be ≤1/1000.

• Maintenance:

  • Daily inspection: check the lubrication of rack and pinion daily; clean the debris on the track weekly.

  • Regular maintenance: check the gear wear every quarter; replace the reducer lubricant every year.

Service and Support

• Process design: provide free program consultation and process design.

• Installation guidance: send professional engineers for on-site installation guidance and commissioning.

• Spare parts supply: always have key parts of the transmission system (gears, racks, reducers) available.

• Upgrading: We can provide rack and pinion transmission system upgrading services for traditional center-driven or peripheral roller-driven densifiers.

NT peripheral rack and pinion thickener has become the core equipment of solid-liquid separation section in modernized large-scale mineral processing plant and environmental protection project due to its huge processing capacity, excellent reliability and low operating cost. We can provide the most suitable equipment selection and all-round technical service according to your specific material and process requirements.