ZN Series Automatic Flocculant Dosing System

The ZN Series Automatic Flocculant Dosing System is an intelligent chemical management unit designed to achieve accurate, efficient, and stable dosing of flocculantsin mineral processing, water treatment, and environmental protection applications. By integrating automatic feeding, precise solution preparation, controlled maturation, programmable control, and quantitative dosing into a single system, the ZN Series completely replaces traditional manual mixing and rough chemical addition methods.

Through precise control of flocculant solution concentration, dosing rate, and mixing conditions with process slurry, the ZN Series maximizes flocculant efficiency while minimizing chemical consumption. It plays a critical role in stabilizing process performance, reducing operating costs, lowering labor intensity, and improving overall plant safety. The system is an essential auxiliary unit for thickeners, clarifiers, dewatering equipment, and wastewater treatment processes.

The ZN Series Automatic Flocculant Dosing System is composed of several functional modules, each optimized for reliability, dosing accuracy, and ease of automation.

Storage and Feeding Module

Dry Powder Storage Hopper

Designed for polymer dry powder storage, the hopper is equipped with level indicators, moisture protection measures, and anti-bridging devices to ensure smooth and reliable material flow.

Precision Feeding Device

As a core component of the system, precision feeders such as screw feeders or loss-in-weight feeders provide continuous and accurate metering of flocculant powder. High feeding accuracy ensures stable solution concentration and consistent downstream performance.

Emulsion Storage Tank and Metering Pump (Optional)

For liquid or emulsion-type flocculants, the system can be configured with dedicated storage tanks and progressive cavity pumps or diaphragm pumps for accurate dosing.

Preparation and Maturation Module

Pre-Wetting Unit

Dry polymer powder is pre-wetted with atomized water to prevent the formation of undissolved agglomerates (“fish eyes”), ensuring proper hydration at the initial mixing stage.

Preparation Tank

Equipped with a high-speed dispersing agitator, the preparation tank rapidly mixes polymer and water to form an initial solution. Liquid level control ensures stable operation and prevents overflow or dry running.

Maturation Tanks

One or multiple maturation tanks are fitted with low-speed paddle or propeller agitators, allowing polymer molecular chains to fully hydrate and unfold. Typical maturation time ranges from 30 to 60 minutes, ensuring the flocculant reaches optimal activity before dosing. Multiple tanks enable continuous, uninterrupted operation.

Dosing and Dilution Module

Dosing Pumps / Metering Pumps

Mature polymer solution is delivered to the application point via progressive cavity pumps or diaphragm pumps with stepless flow regulation, enabling precise control of dosing volume.

Inline Dilution and Static Mixing Devices

Before entering the process stream, the polymer solution is further diluted and homogenized using static mixers or inline dilution systems to achieve the desired working concentration and ensure uniform contact with slurry.

Process Control and Monitoring Module (System Core)

PLC and Touchscreen Control System

The ZN Series features a programmable PLC-based control system with a human-machine interface (HMI). Operators can set and adjust key parameters, including:

Polymer feeding rate

Water flow rate

Solution concentration

Maturation time

Dosing flow rate

Online Monitoring Instruments

Optional instruments such as concentration meters (refractometers), flow meters, and pH meters provide real-time feedback to the control system, enabling closed-loop control and highly stable operation.

Mineral Processing and Metallurgy

The ZN Series is widely used to supply flocculants for:

Thickeners (including high-rate and deep cone thickeners)

Filtration systems

Tailings treatment processes

Stable and precise dosing is essential for achieving high underflow density, clear overflow, and efficient dewatering performance.

Coal Preparation

Applied in coal slurry thickening, clarification, and pressure filtration processes to improve water recovery and reduce discharge.

Municipal and Industrial Wastewater Treatment

Used for sludge settling in primary and secondary clarifiers, as well as sludge conditioning prior to belt filter presses or centrifuges.

Aggregate and Sand Washing Plants

Supports rapid sedimentation of fine particles in sand washing wastewater and fine sand recovery systems.

Other Industries

Including paper making, chemical processing, and food industries, where flocculants are used for process water clarification, solid-liquid separation, and sludge dewatering.

The ZN Series Automatic Flocculant Dosing System is suitable for a wide range of polymer flocculants, including:

Anionic polymers

Cationic polymers

Non-ionic polymers

The system supports various physical forms such as dry powder, emulsion, and microcapsulated flocculants (PAM).

Fully automated preparation and dosing process

High dosing accuracy and stable solution concentration

Optimized flocculant utilization and reduced chemical consumption

Reliable continuous operation with minimal operator intervention

Flexible configuration to match different process requirements

Proven performance in mining, environmental, and industrial applications